Lt-1 396 ???
10-27-2010, 07:18 AM
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Lt-1 396 ??? 94 lt-1 396 3.73 gears,A4,heres the cam specs these specs are ground on a 1.5 rocker arm but i have 1.6 on this cam •Advertised Duration (Int/Exh): 282/290
•Duration @ .050 (Int/Exh): 231/239
•Gross Valve Lift (Int/Exh): .535/.550
•LSA/ICL: 110/106
and useing tunercats to tune ported lt1 heads with Patriot Performance Part Number: 8401-BSBC parts in the head. hp numbers seemed low to me??? any in put if cam is to small?? oh for the stall its a yank 3200.and victor race headers.
•Duration @ .050 (Int/Exh): 231/239
•Gross Valve Lift (Int/Exh): .535/.550
•LSA/ICL: 110/106
and useing tunercats to tune ported lt1 heads with Patriot Performance Part Number: 8401-BSBC parts in the head. hp numbers seemed low to me??? any in put if cam is to small?? oh for the stall its a yank 3200.and victor race headers.
10-27-2010, 07:26 AM
#2
Itd be nice to know a little more about the heads, like who ported them. The cam is deffenitly small, what are the hp numbers its putting down? Are you tuning it? need so more info.
10-27-2010, 09:23 AM
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401 rwhp pump gas i ported the heads and had the valves back cut im tuneing it with tunercats dont know the flow numbers sorry
Last edited by drewbusa; 10-27-2010 at 09:36 AM.
10-27-2010, 11:53 AM
#6
If you want a dyno queen buy a supra/ls1. 400whp on an lt1 will run 10s properly setup. What are you looking at dyno #s for? Bragging rights?
10-27-2010, 12:08 PM
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As long as you know it's healthy to run, take it to the track to see what it will do. I've never been able to read/understand dyno numbers put out from an auto car. RPM wise, where does torque and power peak?
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10-27-2010, 01:58 PM
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so puting the 1.6 rockers on the cam didnt make it bigger the specs i put up of it was for 1.5 rockers. i was told that the 1.6 would make it more lift and duration was that true? should i pull it out and put a SR cam in it? i was gona get the heads flow after i ported them but was ready to put it together.has anyone had good luck out of the spring kit i put on my heads?
10-27-2010, 02:23 PM
#11
so puting the 1.6 rockers on the cam didnt make it bigger the specs i put up of it was for 1.5 rockers. i was told that the 1.6 would make it more lift and duration was that true? should i pull it out and put a SR cam in it? i was gona get the heads flow after i ported them but was ready to put it together.has anyone had good luck out of the spring kit i put on my heads?
10-27-2010, 02:37 PM
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415 RWHP here unlocked 3000 vigilante, also a pretty small cam 236/244 .570 lift, went 11.80 @ 119 slamming the rev limiter through single 3 inch exhaust, your car should be fine.
10-27-2010, 06:00 PM
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If I understand what you've written you're running a simulation program trying to get a handle on the power. Am I correct on that? If not, tell me what you're up to.
I use Engine Analyzer Pro Version 3.5 and what I know from the years I've used it is that the head flow numbers are indispensable if you want to even be in the ballpark on power output. EAP allows the CFM flow numbers to be individually entered from as low as .050" valve lift to whatever max lift you'll have.
Since my cam peaks at just over .600" valve lift I enter the head flow numbers up to .650" ( in .100" increments) which is more than the engine will ever see running the cams I've been looking at. EAP's new version also made me realize how important the 0.00"/.050" duration AND .050"/.200" duration specs are in the program's ability to calculate the cam's ramps.
My point is how critical it is to have all the specs on your engine. It's the old "Garbage In - Garbage Out - thinking. If the numbers entered aren't accurate and precise the results won't be either. So you absolutely need the head flow numbers of at least one intake and one exhaust port. From valve lifts of .050" to .700" in .050" increments (if you can get 'em that tightly; if not, .100").
As far as your camshaft choice, what many fail to realize is it's the INTENDED PURPOSE of the engine that dictates to a great extent the cam selection. Naturally a Race Only cam will be different than one chosen for a Daily Driver engine. So when you read posts like "Your cam's too small" or "Your cam is definitely small" or similar comments it's important to always remember "For the Intended Purpose".
As an example, when considering THE INTENDED PURPOSE FOR THE LT1 ENGINE I'M BUILDING, for my son's 96 LT1, your cam has much to much duration. See what I mean? For The Intended Purpose. It depends on how the engine will be used, what characteristics you want the engine to have, what are your goals, etc., those are the first things to be asked and answered.
Jake
I use Engine Analyzer Pro Version 3.5 and what I know from the years I've used it is that the head flow numbers are indispensable if you want to even be in the ballpark on power output. EAP allows the CFM flow numbers to be individually entered from as low as .050" valve lift to whatever max lift you'll have.
Since my cam peaks at just over .600" valve lift I enter the head flow numbers up to .650" ( in .100" increments) which is more than the engine will ever see running the cams I've been looking at. EAP's new version also made me realize how important the 0.00"/.050" duration AND .050"/.200" duration specs are in the program's ability to calculate the cam's ramps.
My point is how critical it is to have all the specs on your engine. It's the old "Garbage In - Garbage Out - thinking. If the numbers entered aren't accurate and precise the results won't be either. So you absolutely need the head flow numbers of at least one intake and one exhaust port. From valve lifts of .050" to .700" in .050" increments (if you can get 'em that tightly; if not, .100").
As far as your camshaft choice, what many fail to realize is it's the INTENDED PURPOSE of the engine that dictates to a great extent the cam selection. Naturally a Race Only cam will be different than one chosen for a Daily Driver engine. So when you read posts like "Your cam's too small" or "Your cam is definitely small" or similar comments it's important to always remember "For the Intended Purpose".
As an example, when considering THE INTENDED PURPOSE FOR THE LT1 ENGINE I'M BUILDING, for my son's 96 LT1, your cam has much to much duration. See what I mean? For The Intended Purpose. It depends on how the engine will be used, what characteristics you want the engine to have, what are your goals, etc., those are the first things to be asked and answered.
Jake
10-27-2010, 06:15 PM
#15
the rockers will increase the lift and will increase the duration at .050 by maybe a degree or two.....but it is impossible to affect the actual duration of the camshaft with rockers........going SR is a bit more involved than just popping one in lol.....they make great power but requrire a bit more.........id have your heads flowed and then spec a cam out to the heads.....no point in guessing at it
It's better to look at valve action as an area measurement, which is most definitely affected by rocker ratio.otherwise... I'm
at the rest of this thread
10-27-2010, 06:58 PM
#16
Props to running 11's, i hope to go that fast some day. Im not ******* on you or anything. but a 396 stroker with heads/cam should go faster.
hate to say it, just seems slow to me. I beleive some people are doing those times with an LE2 setup on a 350ci motor.
hate to say it, just seems slow to me. I beleive some people are doing those times with an LE2 setup on a 350ci motor.
10-27-2010, 08:37 PM
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Well its the wifes car. she wanted me to build something for her to play with so we got to building it. the car dose run great she drives it every day to the bank.i feel like its tuned as good as it can get by what the datalog is telling me.i was just really trying to see what others had to say and if it was low on rwhp vs other with there lt1 built close to the same.soon to put trickflow heads cnc'd and a custom cam with tpis intake and monoblade tb.i built it with the stock heads i ported and cam thats on it now just to get her use to it and learn how to leave on the lights at the track.so i guess for the ressons of her getting use to it.is why it ended up built this way for rite now.was hope it would of been mid 400hp but its all good. i cant even belive the tork this monster makes.love lt1 car 
10-27-2010, 09:57 PM
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Dude horse power is just a number, and dynos are not all the same, take it too the track (the track is the real dyno) my 396 put down 375rwhp, and i went 10.95 with a small shot of nitrous with a full weight car and 17" wheels.
10-27-2010, 10:07 PM
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Ive had it at the track 2.00 60ft 9.99@109 in 1000ft iwas on street tires 17" sping bad im happy with the tracktimes now to see what it dose with drag tires and skinys up front
