pump gas high comp.

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hondakiller

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Just trying to get a idea on what is the highest compression i can run in my 400 build on pump gas im gonna be running high test anyway like run 12.5 but dont know if thats to high or not
 
I think a lot of it has to do with your set up. Ive got a friend running a .060 over 427 in his 52 plymouth and its at 11.5:1. ALuminum heads, not sure on the quench. He has no problems with detonation, just runs a little hot once in a while! 93 octane gas.
 
way too high or 12.501/4 mile? engine can blow right by the 12s and into mid 11s with a 9.7 compression ratio and a voodoo 305 hyd cam with adjustable rockers. Ill give ya a good combo if your interested, lemme know, take care should see 460 rear wheel hp standard stroke.thats over 550 at the crank
 
aluminum heads allow the engine to run almost 2 points more compression . say if your runnin 11.5 to 1 actual comp ratio its a lil over 9.5 with aluminum heads which is great for pump gas
 
yeah dart , that heat transfers to the cooling system but nothing an aluminum radiator from jegs cant handle
 
im shooting for 10 sec car or faster all motor gonna try it on pump gas but car will be street driven
 
mopar1962 said:
yeah dart , that heat transfers to the cooling system but nothing an aluminum radiator from jegs cant handle
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His problem was air lock in the cooling system cause the intake was the highest point in the system. I think he recently added an overflow tank on the firewall to take care of that.
 
maybe he just need a higher rated cap ,I run a 20 psi on my car
 
Honda... thought it was a 360. I think I remember you fronm a while ago...
 
hondakiller said:
so runing 12.5:1 compretion and geting good power is possible on pump gas?
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It's possible, but more likely, it'll be something your not going to be to happy with. Like Adam said, it is all in the combo of parts. The things needed to run a high compresion engine on pump gas would be things like;

Big cam
Lots of overlap
Aluminum heads to disapate heat
If the engine has poor quench, mega reduced timing.

With the above parts, IE; the big cam, that helps bleed of pressure, the cams RPM range is very hhigh and the accoiated parts to use with it are things like,;

A high stall converter, numerically high gear ratio. This is a no brainer in that it will decrease Hwy. driveability. Then add to the mix the other parts that also "Make" the combo.

Big carb, big tube headers, single plane intake. Driveabilty drops some more.

Also, if the car is to heavy for the combo, it'll be a piggish monster off the line and may never actually see it's full potentail in performance. (ET)
In order to balance the engine and car, you'll need a big diet. What equipment will you remove and live without?

Are manual brakes ok? No A/C or defrost/heat OK to live without?

OH, food for thought. The NASCAR Crasftsman Truck series engines are not only limited in total cubes, but also a 9.0-1 comp. ratio.
They make over 700 HP.

Things that make you go "Hummmmmmmmmmmmmmm."
 
all good to me no heat no ac fine by me and it alrady has manual brakes ...im 21 damn near 22 im not a old fart i can take it .. ive never owned a car wit ac and my daily driver has heat so think im good and diet no big deal its not like its my daily driver car will only see streets some weekends and tracks some times i work most weekends so ...just another toy all it is but i want it to have power and go dont need be geting beat by my buddys 11.3 sec civic
 

OK, I see tis is a mild drag car that will see limited street. Now where getting somewhere.
 
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