whats the highest compression anybody's ran in an ecotec all ive heard is 10:1 range i have heard much over that
Owen is running 11:1 wisecos right now, you can get them in .020 and .040 bore also
1989 Turbo Trans Am #82, 2007 Cobalt SS G85
thats the highest anyones seen wow i figured someone would be running more than that i was hoping 15 or 16 maybe. oh well new task someone should do
eric mead wrote:thats the highest anyones seen wow i figured someone would be running more than that i was hoping 15 or 16 maybe. oh well new task someone should do
People who buy econoboxes don't usually want to spend $100/tank to run around drinking race gas.
fortune cookie say:
better a delay than a disaster.
Quote:
thats the highest anyones seen wow i figured someone would be running more than that i was hoping 15 or 16 maybe. oh well new task someone should do
umm why? ud need around 116 octane just to drive the car.
http://www.myspace.com/15102113
when you do a trubo you use 87 hell no and it uses more gas, but i was just wondering i havent really seen any real good n/a builds from eco's but we'll see it'd be pretty cool to see one running around. i liked the stroker motor idea but that probably wouldn't rev as good and really it 'd be nice if it rev'ed alittle more really but oh well
OHV notec wrote:eric mead wrote:thats the highest anyones seen wow i figured someone would be running more than that i was hoping 15 or 16 maybe. oh well new task someone should do
People who buy econoboxes don't usually want to spend $100/tank to run around drinking race gas.
okay maybe a stupid question but this got me thinking..
what different from running 15:1 CR that makes it have to run race gas?
when you can run 12lbs of boost on a motor with 9:1 CR...that equals about 16.3:1effective CR and sitll run 92oct?
does n/a still change the effective CR differently? am i missing something? please enlighten me
When you build an N/A engine, you need to consider your cams for compression.
Overlap will lower compression. Take my W41. 12:1 compression but with a set of .430" and 224° cams, there's a good overlap and the running pressure is 275psi.
A stock Ho = 10:1 compression = 210psi
A stock 2.4 = 9.5-9.7:1 compression = 210psi
Timming has alot to do.
A high compression N/A engine will need more timming and be more detonation prone to make good power. On a boosted engine, you have boost to make power, on the N/A engine, you goota use as much as you can from what is going in.
So using an N/A engine running 15:1 or 16:1 running no timming and a alot of overlap on the cam will be useless.
Gilles
2.3 Ho
ahh thank you very very much.. very nice to know info.
