Dyno Guesses & Bench Racing Forum - what RWHP numbers did you pull with your LS1 383 stroker?

I have the eagle stroker kit with a big cam LT headers fast intake fast 90mm tb stainless steal 3 1/2 " exhaust but stock ported heads and stock fuel system and only pulling 400rwhp will heads and fuel system really make a big difference?

With a dyno tune ofcourse

Am i the only one with a 383? :drive:

You'd have better luck in the internal section. You mean to tell me you have a 383 stroker with a big cam, fast 90 setup and ported heads and are only making 400 rwhp? Something is seriously wrong. It's almost impossible not to make 400 rwhp with just a cam swap. More details on the cam and heads.

6 speed or auto transmission ? What brand was the dyno ?

More details plz, doesn't sound right. Should at least be around 430.

You'd have better luck in the internal section. You mean to tell me you have a 383 stroker with a big cam, fast 90 setup and ported heads and are only making 400 rwhp? Something is seriously wrong. It's almost impossible not to make 400 rwhp with just a cam swap. More details on the cam and heads.

Its a 6 speed and i cant remember off the top of my head the cam specs and for the heads i have the port specs at home ill let you know asap, but i agree with everbody that its not putting out enough hp deffinently something going on...

6 speed or auto transmission ? What brand was the dyno ?

Im going to ask the guy who didthe dyno tune today! Hope fully its the dyno not putting all numbers? And its a six speed

More details plz, doesn't sound right. Should at least be around 430.

I agree

it should be well over 430 IMO.. there are LS1 stock headed cars putting that out and more..

Does the car feel strong? Does it run weird at all? I would think 450 anyway.

Does the car feel strong? Does it run weird at all? I would think 450 anyway.

i will say the car runs strong but i expected a bit more and i do notice an excessive amount of oil burn not really the typical ls1 oil consumption but a bit more....

it should be well over 430 IMO.. there are LS1 stock headed cars putting that out and more..

i agree

yeah those numbers are deff low, my LME 370 with trex cam, PC headers and exhaust made 440whp 410tq, stock 241s and ls6 mani.

423rwhp 427rwt with stuff in my sig

http://i21.photobucket.com/albums/b275/Velocityman/IMAG0078.jpg[/IMG]Ok fellas heres the cam specs!

i will say the car runs strong but i expected a bit more and i do notice an excessive amount of oil burn not really the typical ls1 oil consumption but a bit more....

Smokes quite a bit

I would do a leak down test on the motor. If you have smoke and oil consumption, something is going on... Rings, valve seals, ect. The 6 speed trans will always give higher #'s VS a auto. How old is this engine ?

if you feel it runs strong never mind the dyno #'s, what does it do in the 1/4?

I would do a leak down test on the motor. If you have smoke and oil consumption, something is going on... Rings, valve seals, ect. The 6 speed trans will always give higher #'s VS a auto. How old is this engine ?

I very much agree sir with a leak down test! Ima try to do one this week! The engine only has over 27,000 miles...

if you feel it runs strong never mind the dyno #'s, what does it do in the 1/4?

Deffinently working on that just need a stronger rear

And thanks for all the help so far guys

I think conan has it right, by I would go ahead and do a compression test and vacuum test as well in that order. When doing the leak down, make sure the cylinder is at TDC on the power stroke and listen for air coming through the oil fill cap, throttle opening, exhaust and look for bubbles in the radiator. Compression should be in the 150's or higher and all should be within 20 psi of eachother. If two cylinders are low together then you have a cylinder sealing issue.

As for smoke, light blue is oil, black is fuel, and white is coolant. If its black then you may have excess fuel consumption or not having good burn. While you're doing the leak down and compression look at your plugs and see if they have black soot or heavy carbon build up. They should be a brownish color. Hope this helps

I think conan has it right, by I would go ahead and do a compression test and vacuum test as well in that order. When doing the leak down, make sure the cylinder is at TDC on the power stroke and listen for air coming through the oil fill cap, throttle opening, exhaust and look for bubbles in the radiator. Compression should be in the 150's or higher and all should be within 20 psi of eachother. If two cylinders are low together then you have a cylinder sealing issue.

As for smoke, light blue is oil, black is fuel, and white is coolant. If its black then you may have excess fuel consumption or not having good burn. While you're doing the leak down and compression look at your plugs and see if they have black soot or heavy carbon build up. They should be a brownish color. Hope this helps

Thanks sure does help alot. Im going to accomplish the tests through out this week most likely starting tomorrow and thursday i will keep you posted thanks again:cheers:

Good luck with the tests. With the power numbers being down and the smoke issue, something definitely sounds amiss.

be as thorough as possible with your diagnosis and when posting back. every detail matters when it comes to online diagnosis lol. GL

Good luck with the tests. With the power numbers being down and the smoke issue, something definitely sounds amiss.

Thanks man ima need it!!!

be as thorough as possible with your diagnosis and when posting back. every detail matters when it comes to online diagnosis lol. GL

Will do man!! Just picked up a Compression test tool! Will let you know how that goes first Thanks again!

Good luck, any test results yet ?

Good luck, any test results yet ?

Thanks man, not yet im having trouble trying to screw in the pressure tester, there is no space!! Im going to give it a shot again and go under the car after work hopefully tomorrow i will let you know asap!

You can try to take the coils off the rocker covers to give you a little more room.

You can try to take the coils off the rocker covers to give you a little more room.

Thanks ima try that

Smokes quite a bit

this is a symptom of the problem for sure. shouldn't be smoking like that regardless

this is a symptom of the problem for sure. shouldn't be smoking like that regardless

Exactly what i was thinking

how about you just pull the plugs and read them? see if they have too much oil, if they are rich with fuel? i did this recently and came to found cylinder 7 was gone to shit. pulled the plug and it was full of oil, pulled the head and it was full of oil in cylinder. ring had gone to shits on me. good luck finding the problem, hope it isn't major.

http://i21.photobucket.com/albums/b275/Velocityman/IMAG0078.jpg[/IMG]
Ok fellas heres the cam specs!
Your cam is too small. You need to be closer to the .600 lift zone. :D

how about you just pull the plugs and read them? see if they have too much oil, if they are rich with fuel? i did this recently and came to found cylinder 7 was gone to shit. pulled the plug and it was full of oil, pulled the head and it was full of oil in cylinder. ring had gone to shits on me. good luck finding the problem, hope it isn't major.

Thanks brotha well when i pull the plugs the threads usually have the oil! And the plugs are dry ?

Your cam is too small. You need to be closer to the .600 lift zone. :D

Yessir

Well i did the pressure test fellas i disconnected the fuel spark and had it wot every cylinder and its pressure for all cylinders where around 180 the engine has 10:5 compression so im assuming thats a good range....it all boils down to a leak down test!

What did your spark plugs look like when you pulled them ?

They where pretty ashy they looked like they had build up they had oil on the threads? Ill post a pic when i get off of work!

What did your spark plugs look like when you pulled them ?

They where pretty ashy they looked like they had build up they had oil on the threads? Ill post a pic when i get off of work!

What did your spark plugs look like when you pulled them ?

http://i21.photobucket.com/albums/b275/Velocityman/IMAG0082.jpg

how fast does your engine spin?
your LSA is huge for a hot rod.
i might also recommend less duration till you get aftermarket heads.

EDIT: your plugs look like there is water or something on them possibly too hot a heat range as well

how fast does your engine spin?
your LSA is huge for a hot rod.
i might also recommend less duration till you get aftermarket heads.

EDIT: your plugs look like there is water or something on them possibly too hot a heat range as well

yeah i wouldnt doubt it man that cam is huge its a custom build from Schneider Racing and as far as spining in high rpm its great but if your at a light and want to just cruise it itll bog and almost stall, so at a light i have to give a lil rev to get off a step easily lol yeah so went over board i really wanted an agressive sound..

Wow, do all of them look like that ? Leak down test yet ? have you noticed any coolant loss ?

Wow, do all of them look like that ? Leak down test yet ? have you noticed any coolant loss ?

Yes they all look like that....pretty crappy..and as for coolant loss i have not notice any i check it everyday..im hopefully going to do the leak down test this weekend hopefully!

Looks lk detonation? Look into the tune, how many years has ur tuner been tuning? Also ur lift is way too low. I have cam/heads on my caddy and pushing 444 rwhp on stock cubes. Change cam out, look into tune and u should pick up a bit. Before any of that do a leak down test. Hell drain ur radiator and see wat it looks lk. How hot is ur car getting?

Looks lk detonation? Look into the tune, how many years has ur tuner been tuning? Also ur lift is way too low. I have cam/heads on my caddy and pushing 444 rwhp on stock cubes. Change cam out, look into tune and u should pick up a bit. Before any of that do a leak down test. Hell drain ur radiator and see wat it looks lk. How hot is ur car getting?

Right on brotha thanks for the info! The guy has been tuning for a very long time all GM. Yes i am hopefully going to do a leak down test this weekend! The car runs at 160 all day.. but burns alot of oil....so yeah it probably is the big ass cam no good:confused: ill let you know how the leak down goes. Thanks again

is this a daily driver or a saturday night special?
i would get a cam that has about 225-230 duration at .50
you can get a little more lift with that smaller cam.
also next cam try to get a lobe separation angle around 110
the cam you have now is suited for a car that spins around 7000RPM or more, considering your listed mods
if you just upgrade your valve train i guarantee youll pick up.
also how many mile are on your engine/ who built it?
im not good at judging plugs but im pretty sure your gaskets are leaking water.
what kind of plugs do you have and what are their heat range?

is this a daily driver or a saturday night special?
i would get a cam that has about 225-230 duration at .50
you can get a little more lift with that smaller cam.
also next cam try to get a lobe separation angle around 110
the cam you have now is suited for a car that spins around 7000RPM or more, considering your listed mods
if you just upgrade your valve train i guarantee youll pick up.
also how many mile are on your engine/ who built it?
im not good at judging plugs but im pretty sure your gaskets are leaking water.
what kind of plugs do you have and what are their heat range?

Exactly this set up is ment for high rpm and yes thats whats on the todo list im going to get new heads and a better fuel sysem stock one aint cuttin it no more when i get the heads. Still debating on what heads i should get though.So the engine only has about 30000 miles on it. For the spark plugs they are NGK TR6 heat range of 6 with only about 5000 miles on them lol. The shop who built my motor was excelsior motorsport really nice shop.

hey fellas sorry for the wait been working alot im still trying to get a leak down tester tool hopefully this weekend ill let you know thanks!

Exactly this set up is ment for high rpm and yes thats whats on the todo list im going to get new heads and a better fuel sysem stock one aint cuttin it no more when i get the heads. Still debating on what heads i should get though.So the engine only has about 30000 miles on it. For the spark plugs they are NGK TR6 heat range of 6 with only about 5000 miles on them lol. The shop who built my motor was excelsior motorsport really nice shop.

they are tr5s with gapped at .42 ive been doing alot of research and for one you guys where right about the cam it kinda sucks and it is also running very rich! and as far as the oil consumption im thinking may since they are stock ported heads, the people that did them probably didnt put and loctite or any sealer..on the rocker bolts... any suggestions? im thinking of pulling off the valve covers at the moment..thanks for the help

I dont have a whole lot of experience with ls1 motors but i do have alot of motorcycle 2 and 4 stroke troubleshooting experience and i can read plugs well, that really looks like detonation, do you still have your egr hooked up, common causes for detonation are a faulty EGR valve, lean air/fuel mixtures, ignition timing advanced too far, and insufficient octane rating of the gasoline. Curious to see what this turns out to be

they are tr5s with gapped at .42 ive been doing alot of research and for one you guys where right about the cam it kinda sucks and it is also running very rich! and as far as the oil consumption im thinking may since they are stock ported heads, the people that did them probably didnt put and loctite or any sealer..on the rocker bolts... any suggestions? im thinking of pulling off the valve covers at the moment..thanks for the help

Too hot of a plug.. get NGK TR6 part #4177.. gap them at .040-.050. Replace asap.

The leakdown test will tell you where your smoking problem is coming from so you'd better get that done soon too. Also, what color is the smoke? We need to know to determine what's getting burned up and I see no one asked that previously.

Too hot of a plug.. get NGK TR6 part #4177.. gap them at .040-.050. Replace asap.

The leakdown test will tell you where your smoking problem is coming from so you'd better get that done soon too. Also, what color is the smoke? We need to know to determine what's getting burned up and I see no one asked that previously.

Right on man thanks ima get those tomorrow but the smoke is blue (oil) but when i punch it a cloud of black smoke shoots out(Rich) so yeah has to be the tune but im going to check those rocker holes tonight!

I dont have a whole lot of experience with ls1 motors but i do have alot of motorcycle 2 and 4 stroke troubleshooting experience and i can read plugs well, that really looks like detonation, do you still have your egr hooked up, common causes for detonation are a faulty EGR valve, lean air/fuel mixtures, ignition timing advanced too far, and insufficient octane rating of the gasoline. Curious to see what this turns out to be

Yeah man im pretty sure its the tune...

they are tr5s with gapped at .42 ive been doing alot of research and for one you guys where right about the cam it kinda sucks and it is also running very rich! and as far as the oil consumption im thinking may since they are stock ported heads, the people that did them probably didnt put and loctite or any sealer..on the rocker bolts... any suggestions? im thinking of pulling off the valve covers at the moment..thanks for the help

No sealer on the rocker bolts is a good possibility for the oil consumption. Looking at the spark plug it has a lot of buildup, which usually =oil getting in the cylinders & since youre getting smoke from the exhaust which only makes sense as your having to add oil all the time but it could be from valve seals as well. That plug has oil all over it! If it is the valve seals it wont show up on a cyl leakdown test. Like everyone else said you need more lift & a lil less duration on that cam for that 383 to run good.

No sealer on the rocker bolts is a good possibility for the oil consumption. Looking at the spark plug it has a lot of buildup, which usually =oil getting in the cylinders & since youre getting smoke from the exhaust which only makes sense as your having to add oil all the time but it could be from valve seals as well. That plug has oil all over it! If it is the valve seals it wont show up on a cyl leakdown test. Like everyone else said you need more lift & a lil less duration on that cam for that 383 to run good.

Keep in mind not all heads have the intake valve rocker arm hole protruding through to the intake port of the head depending on the cnc work but that is a good idea for him to check.

No sealer on the rocker bolts is a good possibility for the oil consumption. Looking at the spark plug it has a lot of buildup, which usually =oil getting in the cylinders & since youre getting smoke from the exhaust which only makes sense as your having to add oil all the time but it could be from valve seals as well. That plug has oil all over it! If it is the valve seals it wont show up on a cyl leakdown test. Like everyone else said you need more lift & a lil less duration on that cam for that 383 to run good.

Yessir agreed better cam, ima pull a rocker off today hopefully after work im hoping to see no sealer lol but will let you know the outcome thanks!!

Keep in mind not all heads have the intake valve rocker arm hole protruding through to the intake port of the head depending on the cnc work but that is a good idea for him to check.

Right on will do, what does cnc stand for?

Right on brotha thanks for the info! The guy has been tuning for a very long time all GM. Yes i am hopefully going to do a leak down test this weekend! The car runs at 160 all day.. but burns alot of oil....so yeah it probably is the big ass cam no good:confused: ill let you know how the leak down goes. Thanks again
Good luck on the engine!!! I'd suggest going back to a stock thermostat, there's a reason GM didn't put in a thermostat too low, you'll have premature wear of parts and when the engine doesn't run at correct OT this will happen everytime. All out race engines yeah I'd do it since good chance you'll be rebuilding it sooner than later but with a car you typically drive a few times a week for things other than racing it's not a wise idea

Yessir agreed better cam, ima pull a rocker off today hopefully after work im hoping to see no sealer lol but will let you know the outcome thanks!!

You wont see it pulling the rockers, pulling the intake you can see if oil is coming from the rocker bolts or if the heads were even ported that much. I said valve seals but worn valve guides could cause it too.

Good luck on the engine!!! I'd suggest going back to a stock thermostat, there's a reason GM didn't put in a thermostat too low, you'll have premature wear of parts and when the engine doesn't run at correct OT this will happen everytime. All out race engines yeah I'd do it since good chance you'll be rebuilding it sooner than later but with a car you typically drive a few times a week for things other than racing it's not a wise idea

Thanks man ima keep that in mind!!

You wont see it pulling the rockers, pulling the intake you can see if oil is coming from the rocker bolts or if the heads were even ported that much. I said valve seals but worn valve guides could cause it too.

Oh ok ima take off the manifold then thanks for the help!!!

Get a leak down test done before you start to tare shit apart. That will eliminate alot of questions. Also do you run a catch can on your PCV system ?

Get a leak down test done before you start to tare shit apart. That will eliminate alot of questions. Also do you run a catch can on your PCV system ?

sorry Conan was working but i took off the manifold and found oil behind the valves......:(

intake side ouch!

http://i21.photobucket.com/albums/b275/Velocityman/IMAG0103.jpg

Im gonna call valve seals

How much oil do you have in the intake manifold ? If you have a bunch I would do a catch can setup on the pcv and get those valve seals replaced.

How much oil do you have in the intake manifold ? If you have a bunch I would do a catch can setup on the pcv and get those valve seals replaced.

Yeah deffinently gonna get a catch can and a ls6 valley cover, yes in the intake manifold has oil inside...what kind of catch can do you recommend?

Here's some reading material for you...
http://ls1tech.com/forums/generation-iii-external-engine/1054089-my-catch-can-routing-ok.html
Tons of setups to choose from. Mine is home made and will not work like you would want on a N/A motor.

Here's some reading material for you...
http://ls1tech.com/forums/generation-iii-external-engine/1054089-my-catch-can-routing-ok.html
Tons of setups to choose from. Mine is home made and will not work like you would want on a N/A motor.

thanks for the info brother

alot of people are claiming its my rings then others say valve seals, then i thought maybe since the heads where ported is was the rocker screw holes but when i look inside the port the people that ported the head didnt port the area of where the screw sits therefore no need to worry about that even though i was hoping it was that so now im left with having to take the motor apart :(:bang::pissed:

http://i21.photobucket.com/albums/b275/Velocityman/IMAG0103.jpg
You wont see it pulling the rockers, pulling the intake you can see if oil is coming from the rocker bolts or if the heads were even ported that much. I said valve seals but worn valve guides could cause it too.

heres my smoking problem

It looks like the entire intake port is wet with oil... Coming from the intake. Was there alot of oil in the intake or just a little ? Could you dump oil out of your intake ?

It looks like the entire intake port is wet with oil... Coming from the intake. Was there alot of oil in the intake or just a little ? Could you dump oil out of your intake ?

There is oil in there but not to the point where it would drizzle out thank fully

http://i21.photobucket.com/albums/b275/Velocityman/IMAG0109.jpghttp://i21.photobucket.com/albums/b275/Velocityman/IMAG0108.jpghttp://i21.photobucket.com/albums/b275/Velocityman/IMAG0111.jpg

does anyone know where i can get torque specs for arp head studs?

Arp????? I'd give them a call and ask em

Arp????? I'd give them a call and ask em

ok will do thanks

what cam would you guys suggest i get with my set up?

Have Patrick G spec you a custom grind!

what cam would you guys suggest i get with my set up?
Give Patrick G a pm and he can help ya out with that one, one of the best in the business!!!

Give Patrick G a pm and he can help ya out with that one, one of the best in the business!!!

Right on thanks fellas

well everyone i think i found the problem to my motor not making a good amount of power or atleast what it should. The people who had done the port job on my stock heads pretty much bs'd me the ports look completely stock the chamber looks like they tried to port them and left them all shitty so im having them ported out ligit by a good shop and i cant wait to see if motor combo produces what its suppose too oh and besides the port job new seals and guides!! Thanks for all the help gents

i did 463/465 n/a then 453/455 on nitrous tune,was on a dynojet.hope you get it figured out!!

i did 463/465 n/a then 453/455 on nitrous tune,was on a dynojet.hope you get it figured out!!

Nice man! and thanks

That's definitely caused by oil, and the oil is causing detonation, these 383's like to consume oil if you don't have all the details correct, aka piston to wall clearance just to name one, having said that I'd bet a lot of cash that your guides are worn so bad the seals can't do there job, some is pcv oil but that's a ton of oil lol, for a cam I'd go 227-235. 600 lift114lsa for good street manners and good power, that motor should easily make 450-475 rwhp setup with the right heads and cam imo

That's definitely caused by oil, and the oil is causing detonation, these 383's like to consume oil if you don't have all the details correct, aka piston to wall clearance just to name one, having said that I'd bet a lot of cash that your guides are worn so bad the seals can't do there job, some is pcv oil but that's a ton of oil lol, for a cam I'd go 227-235. 600 lift114lsa for good street manners and good power, that motor should easily make 450-475 rwhp setup with the right heads and cam imo

You said it man those are the numbers im hoping for when i have the right Cam and fuel system on! and yes the previouse guides and seals where SHIT!!!! Cant wait to see if theres going to be a bit of hp difference with the port and polish :cheers:

A bit late but I made 471 on stock ls2 top, heads n intake