11.78@116 MPH on stock twins
09-26-02, 02:42 PM
#77
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Originally posted by jspecracer7
Sure...how about YOU take your own advice.
I've seen cars tuned 10.9:1 and boosting 1.2 kg/cm2 on 102 octane blow engine's...and you want to run 12:1
Sure...how about YOU take your own advice.
I've seen cars tuned 10.9:1 and boosting 1.2 kg/cm2 on 102 octane blow engine's...and you want to run 12:1
09-26-02, 02:56 PM
#78
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Originally posted by fdracer
yeah, but i can turn that around and say that even when you do run rich and have a high octane gas you can still detonate. so what would be your advise to this guy, run even richer? all i'm saying is it's perfectly fine to run rich, just don't expect to make gobs of power, especially on stock twins. it's a tradeoff btwn reliability and power. but my point is running richer than 12:1 gets you about a hairs worth of extra protection, you can still blow pretty easily as your example has proven. imo, the richer and richer you run you get to a point of diminishing returns, where you lose a lot of power and gain very little protection. it's like upgrading to 3mm seals, people still blow their engines all the time with these. and we all know about the never ending 2 vs 3mm debate. our motors can't take detonation period, if we want that extra protection then we should go out and buy supras.
yeah, but i can turn that around and say that even when you do run rich and have a high octane gas you can still detonate. so what would be your advise to this guy, run even richer? all i'm saying is it's perfectly fine to run rich, just don't expect to make gobs of power, especially on stock twins. it's a tradeoff btwn reliability and power. but my point is running richer than 12:1 gets you about a hairs worth of extra protection, you can still blow pretty easily as your example has proven. imo, the richer and richer you run you get to a point of diminishing returns, where you lose a lot of power and gain very little protection. it's like upgrading to 3mm seals, people still blow their engines all the time with these. and we all know about the never ending 2 vs 3mm debate. our motors can't take detonation period, if we want that extra protection then we should go out and buy supras.
3mm seals prove to be a little stronger with detonation but still BREAK. They also prove to have a slower building in boost. They do not compress as well as 2mm. 2mm seals are good for 35psi and I have seen that done and last 200 dyno pulls and over 10,000 street miles on a motor. So it all comes down to who is tuning the car and what numbers your are tuning for. 3mm seals are for people that cant tune or a NOVICE tuner. YES like I said they are good for a little extra protection but still they can break.
-Rikki
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