high compression yes or no?

pitman86gt · 07-16-2006, 12:33 AM

ok what is the highest compression you all would suggest for a street 302 on pump gas. i was thinking of going 10.5 to 1 up to 11 to 1. let me know if this is to much.

myshifter · 07-16-2006, 01:03 AM

11:1 depending on the cam, and how much overlap is ground in will be the determining factor as it will bleed off a little cylinder pressure, what head?

randy78045 · 07-16-2006, 01:10 AM

Quote:

ORIGINAL: myshifter

11:1 depending on the cam, and how much overlap is ground in will be the determining factor as it will bleed off a little cylinder pressure, what head?

Damn it, would you speak english.... an tell him that high compression is not a good idea if a supercharger is in his future... [8D]

myshifter · 07-16-2006, 01:12 AM

Quote:

ORIGINAL: randy78045

Quote:

ORIGINAL: myshifter

11:1 depending on the cam, and how much overlap is ground in will be the determining factor as it will bleed off a little cylinder pressure, what head?

Damn it, would you speak english.... an tell him that high compression is not a good idea if a supercharger is in his future... [8D]

I didnt know he was doing a charger, or is possibly planning it. Check out the toyota prius, I think it was running 13:1, its all in the cam

randy78045 · 07-16-2006, 01:15 AM

Naw, i dont know if hes doing a supercharger or not... but compression is somethin to think about if one has future plans...

myshifter · 07-16-2006, 01:18 AM

nothin like an 11.5:1 400 inch carb motor with a .650 lift 260@.050 cam on the street, ya wanna turn heads? That will do it

pitman86gt · 07-16-2006, 07:20 AM

still debating on charger. dought i will do it. just kind of weighing my options out. i have a tfs stage 2 cam 1.6 rockers and 195cc strike force alum heads, but may be changing to afr 165cc if i decide to go n/a. N/a is what im leaning toward and maybe a shot of nitrous. cant see spending 2 grand on charger when i dont race that much. i hope u all understand.

YamahaBound · 07-16-2006, 11:28 AM

what are the gains from stock pistons to 11.5:1 compression? 50rwhp? what is it? that will be a huge consideration for me when I get mine rebuild. 11.5 will still run on 87/89 octane right?

JD1969 · 07-16-2006, 11:36 AM

Quote:

ORIGINAL: YamahaBound

what are the gains from stock pistons to 11.5:1 compression? 50rwhp? what is it? that will be a huge consideration for me when I get mine rebuild. 11.5 will still run on 87/89 octane right?

LOL umm..no 11.5 is border line with 93 and the right cam. I have had a 11+ compression engine and it ran fine on 93 but the cam bled off pressure, like Myshifter said. But as a rule I would atay less than 10.5 and run 93 octane.

YamahaBound · 07-16-2006, 11:46 AM

so what compression would be ok for 87 pump gas? and what's the hp gains from jumping up to that ratio? what about the 11 ratio and 93 pump gas?