Half pregnant build...Tony Mamo 265’s on a 434” RED sleeved block
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#82
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So I drove the car today, after messing with my off idle tuning some. The car, which is a pro-touring 70’ Chevelle with a custom chassis on coil overs, built by myself, is running Falken Azenis 615k tires, which are sticky. They are however a summer tire. It was, for the record, 61 degrees here today, so not exactly hot, but not too cold either.
My first impression is perhaps I’ve messed up? I was expecting the car to be strong. I’ve watched countless videos of Tony’s combos in corvettes over on Corvette Forum, running 1/4 miles, 1/2 miles, street runs, etc. They are fun to watch, due to the shear power these combos make. I expected similar results.
What I did not expect was the car to spin in 4th gear effortlessly. I never got to full throttle.
After my first mile trip, I came home thinking that my clutch is slipping badly. Up on the lift to check everything, and it all looks great. So back out I go, and I got out about a mile from the house on a long straightway, I roll into the throttle about 3/4 and it violently explodes into wheelspin. At like 55mph. I’m in 4th gear just cruising.
Dry roads. Geesh...what have I done guys?
My Texas Drivetrain Performance stage 3 clutch is rated at 750 torque.
I still have more tuning to do. The car idles beautifully, but has the infamous low speed surge, which I’m determined to make go away.
I can’t wait to get this stupid thing on a dyno....it’s stout.
My first impression is perhaps I’ve messed up? I was expecting the car to be strong. I’ve watched countless videos of Tony’s combos in corvettes over on Corvette Forum, running 1/4 miles, 1/2 miles, street runs, etc. They are fun to watch, due to the shear power these combos make. I expected similar results.
What I did not expect was the car to spin in 4th gear effortlessly. I never got to full throttle.
After my first mile trip, I came home thinking that my clutch is slipping badly. Up on the lift to check everything, and it all looks great. So back out I go, and I got out about a mile from the house on a long straightway, I roll into the throttle about 3/4 and it violently explodes into wheelspin. At like 55mph. I’m in 4th gear just cruising.
Dry roads. Geesh...what have I done guys?
My Texas Drivetrain Performance stage 3 clutch is rated at 750 torque.
I still have more tuning to do. The car idles beautifully, but has the infamous low speed surge, which I’m determined to make go away.
I can’t wait to get this stupid thing on a dyno....it’s stout.
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Heysoos223 (02-04-2020)
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Oh I'm sure you've got an animal on your hand now. Warmer pavement will help but you may end up taking either some timing or fuel out at lower rpm and part throttle just to detorque it some for DD. I had to do that myself.
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Heysoos223 (02-04-2020)
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Well $hit. Thanks for the warning - getting mine ready for the first outing.
Just got a start up tune. Next up a trip to Kooks to have the exhaust installed.
Just got a start up tune. Next up a trip to Kooks to have the exhaust installed.
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Congrats on your progress. I just reviewed your Build specs here
and Your hoped for goals on your Lateral G Thread as well. Don't
Remember if you have a vacuum pump installed or planned
But with one I would bet on 650+ RWHP with your solid roller
Cam specs, Compression, Quench and attention to details.
Really curious to see your Dyno Graph & results to see if
The MSD can peak at or above 7000 RPM.
and Your hoped for goals on your Lateral G Thread as well. Don't
Remember if you have a vacuum pump installed or planned
But with one I would bet on 650+ RWHP with your solid roller
Cam specs, Compression, Quench and attention to details.
Really curious to see your Dyno Graph & results to see if
The MSD can peak at or above 7000 RPM.
#88
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Congrats on your progress. I just reviewed your Build specs here
and Your hoped for goals on your Lateral G Thread as well. Don't
Remember if you have a vacuum pump installed or planned
But with one I would bet on 650+ RWHP with your solid roller
Cam specs, Compression, Quench and attention to details.
Really curious to see your Dyno Graph & results to see if
The MSD can peak at or above 7000 RPM.
and Your hoped for goals on your Lateral G Thread as well. Don't
Remember if you have a vacuum pump installed or planned
But with one I would bet on 650+ RWHP with your solid roller
Cam specs, Compression, Quench and attention to details.
Really curious to see your Dyno Graph & results to see if
The MSD can peak at or above 7000 RPM.
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12-15" of Vacuum. Some suggest no more than 12"
On a street system. Ring seal is huge, I would look
at the GZ system and search the Dyno results section.
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I dont think there's a definite solid answer here. I think the improvement gets better with displacement because you gotta displace the same air above and below the pistons. I also think the improvement, er..., improves with rpm. Again you gotta displace more air below the pistons as rpm increases.
I do think I picked up a mpg from reduced pumping losses even for daily driving. Definitely improved on the freeway.
All that to say I can't give you a definite number but it's enough I noticed it.
I do think I picked up a mpg from reduced pumping losses even for daily driving. Definitely improved on the freeway.
All that to say I can't give you a definite number but it's enough I noticed it.
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I’ll look a little deeper I guess.
Thanks man.
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WOW. I never would have guessed a vacuum pump to add that much to the ground. I KEEP learning here.....
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Engine bay looks good!
Unless you have an R compound out back (100 tread wear) you will have a hard time hooking up that power is my guess.
Nitto NT01- great streetable performance tire with awesome grip once warmed up
https://www.nittotire.com/competitio...d-course-tire/
Unless you have an R compound out back (100 tread wear) you will have a hard time hooking up that power is my guess.
Nitto NT01- great streetable performance tire with awesome grip once warmed up
https://www.nittotire.com/competitio...d-course-tire/
#94
Note you can run a little more vacuum if your running piston squirters to keep the wrist pins lubricated but most builds don't include them. Also the larger gains from a vacuum pump upgrade assume an engine is built with a vacuum pump in mind....something with light tension thin rings etc. On a stock engine with standard tension rings there are less gains to be had with this mod especially at reasonable amounts of crankcase vacuum (like I mentioned earlier 8-10"). You may only see 5-8 RWHP with an OEM or more conventional build but that's still better than a poke in the eye!! (Going from what is typically low levels of crankcase pressure to a vacuum environment makes it a little easier to spin up that rotating assy!)
Even engines built for the pump....at 10-12" of vacuum assuming your rings seal up reasonably well you might bump the output say 10-14 RWHP but when you consider how hard it is to find that type of power at that level its certainly an upgrade worth considering if your building an engine from scratch and can install custom pistons with thin rings, lateral gas porting, etc. to take full advantage of the upgrade.
Hope this helps guys
Regards,
Tony
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Anything worth doing is worth doing well. Build it right the first time....its alot cheaper than building it twice!!
www.mamomotorsports.com
Tony@MamoMotorsports.com
Anything worth doing is worth doing well. Build it right the first time....its alot cheaper than building it twice!!
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Heysoos223 (02-04-2020)
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That's a bit optimistic honestly at engine crankcase vacuum levels safe to run on the street (8-10" of vacuum or so).
Note you can run a little more vacuum if your running piston squirters to keep the wrist pins lubricated but most builds don't include them. Also the larger gains from a vacuum pump upgrade assume an engine is built with a vacuum pump in mind....something with light tension thin rings etc. On a stock engine with standard tension rings there are less gains to be had with this mod especially at reasonable amounts of crankcase vacuum (like I mentioned earlier 8-10"). You may only see 5-8 RWHP with an OEM or more conventional build but that's still better than a poke in the eye!! (Going from what is typically low levels of crankcase pressure to a vacuum environment makes it a little easier to spin up that rotating assy!)
Even engines built for the pump....at 10-12" of vacuum assuming your rings seal up reasonably well you might bump the output say 10-14 RWHP but when you consider how hard it is to find that type of power at that level its certainly an upgrade worth considering if your building an engine from scratch and can install custom pistons with thin rings, lateral gas porting, etc. to take full advantage of the upgrade.
Hope this helps guys
Regards,
Tony
Note you can run a little more vacuum if your running piston squirters to keep the wrist pins lubricated but most builds don't include them. Also the larger gains from a vacuum pump upgrade assume an engine is built with a vacuum pump in mind....something with light tension thin rings etc. On a stock engine with standard tension rings there are less gains to be had with this mod especially at reasonable amounts of crankcase vacuum (like I mentioned earlier 8-10"). You may only see 5-8 RWHP with an OEM or more conventional build but that's still better than a poke in the eye!! (Going from what is typically low levels of crankcase pressure to a vacuum environment makes it a little easier to spin up that rotating assy!)
Even engines built for the pump....at 10-12" of vacuum assuming your rings seal up reasonably well you might bump the output say 10-14 RWHP but when you consider how hard it is to find that type of power at that level its certainly an upgrade worth considering if your building an engine from scratch and can install custom pistons with thin rings, lateral gas porting, etc. to take full advantage of the upgrade.
Hope this helps guys
Regards,
Tony
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It’s been a little while guys. Biggest gremlin here in N. Ga. is rain. It’s been a very wet winter here, so not an awful lot of driving so far, in fact only been 45ish miles. Car runs great, but I have oil on my plugs. Yup. I either have an oil ring issue, or the 75 lbs of fuel I had, which was the cause of my initial surging I was experiencing, washed the cylinders down and hurt the rings. It’s a shame really, as I said the car runs strong. Changed oil a couple times, and inside of oil filter looks good. Had a warm dry day to tune/drive it, and the car did hook ok on a roll, so no more 4th gear spinning, but it ate my clutch...
So I picked up an RPS BC2 clutch, and I’ve got head gaskets coming from Tony. I keep ring sets on the shelf, so I’m going back in. Not what I wanted to do, but I’m a big boy, and I have to pull the combo out to change the clutch anyway. Pulling the engine down to change rings will take a few extra days, IF I don’t need a hone.
Gotta get it right at this point. I won’t settle for anything less. Spring/summer is coming fast, and I want to have the car perfect for nice weather.
In hindsight, I’m glad the dyno day didn’t work out for me yet, as I would have lost the clutch on a pull, and wasted my money there. It’s all good. That’s hot rodding. I’ll keep you guys posted.
So I picked up an RPS BC2 clutch, and I’ve got head gaskets coming from Tony. I keep ring sets on the shelf, so I’m going back in. Not what I wanted to do, but I’m a big boy, and I have to pull the combo out to change the clutch anyway. Pulling the engine down to change rings will take a few extra days, IF I don’t need a hone.
Gotta get it right at this point. I won’t settle for anything less. Spring/summer is coming fast, and I want to have the car perfect for nice weather.
In hindsight, I’m glad the dyno day didn’t work out for me yet, as I would have lost the clutch on a pull, and wasted my money there. It’s all good. That’s hot rodding. I’ll keep you guys posted.
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Heysoos223 (02-04-2020)
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Best of luck Scott! Hope you get it all sorted out! And yeah.... that's hot rodding!
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That sucks. I hate oil where it ain't supposed to be...
How did you blow your Clutch? What brand was it? I installed an RPS in mine. Have no experience with them, but for what they cost, I'm hoping it will be bullet proof. I have no desire to replace my clutch anytime soon. With the way the DSE sub frame sets the engine back, I'll have to pull the engine to get to the clutch...
Good luck.
How did you blow your Clutch? What brand was it? I installed an RPS in mine. Have no experience with them, but for what they cost, I'm hoping it will be bullet proof. I have no desire to replace my clutch anytime soon. With the way the DSE sub frame sets the engine back, I'll have to pull the engine to get to the clutch...
Good luck.
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That sucks. I hate oil where it ain't supposed to be...
How did you blow your Clutch? What brand was it? I installed an RPS in mine. Have no experience with them, but for what they cost, I'm hoping it will be bullet proof. I have no desire to replace my clutch anytime soon. With the way the DSE sub frame sets the engine back, I'll have to pull the engine to get to the clutch...
Good luck.
How did you blow your Clutch? What brand was it? I installed an RPS in mine. Have no experience with them, but for what they cost, I'm hoping it will be bullet proof. I have no desire to replace my clutch anytime soon. With the way the DSE sub frame sets the engine back, I'll have to pull the engine to get to the clutch...
Good luck.
I’m starting the 6 liter install tomorrow that I’ve just finished, in my nephews Silverado, so it will be next week before I get to pull mine out.
The engine in my Chevelle is 3/8”’s off the firewall, so like you, it all has to come out to separate the transmission from the engine. From a maintanance standpoint, it stinks, but from a performance standpoint, which is what the entire car is centered around, it makes sense to move it back.
RPS this time. I laugh at myself thinking about not going this route originally.