HP gains changing timing to 14
03-24-2008, 06:11 PM
#11
6th Gear Member
Join Date: Jan 2008
Location: colorado
Posts: 6,395
RE: HP gains changing timing to 14
ORIGINAL: Gene K
Higher octane rating means it takes a higher temp to ignite gasoline.
It doesnt always follow (as often stated) thathigher octanemeansa slower burn rate.
Ignitiontiming needs to match theburn rate of the fuel you are running.
Racefuel is offered in many different burn rates for similar octane ratings. The fuel used in 18,000 rpm F1 Racing Motorcycles may have high octane ratings but it does not have a slow flame travel speed. It also is very expensive.
If you reach the limits of the octane rating of the fuel before you reach the optimalignition timing for the burn rate you need a higher octanerating.
How do you know you have an adequate octane rating? Once you exceed the optimal ignition timing the car will slow down. This is because the air/fuel mix burns to early reducing cylinder pressure. If you reach this point without any "knock" then the fuel has adequate octane.
Higher octane rating means it takes a higher temp to ignite gasoline.
It doesnt always follow (as often stated) thathigher octanemeansa slower burn rate.
Ignitiontiming needs to match theburn rate of the fuel you are running.
Racefuel is offered in many different burn rates for similar octane ratings. The fuel used in 18,000 rpm F1 Racing Motorcycles may have high octane ratings but it does not have a slow flame travel speed. It also is very expensive.
If you reach the limits of the octane rating of the fuel before you reach the optimalignition timing for the burn rate you need a higher octanerating.
How do you know you have an adequate octane rating? Once you exceed the optimal ignition timing the car will slow down. This is because the air/fuel mix burns to early reducing cylinder pressure. If you reach this point without any "knock" then the fuel has adequate octane.
good to know........well....... try to understang that is[8D]
03-24-2008, 07:59 PM
#14
6th Gear Member
Join Date: Oct 2005
Location: st clair shores MI
Posts: 6,028
RE: HP gains changing timing to 14
ORIGINAL: Bullitt91
i was always told use a higher octane when you have higher compression. im pretty sure thats accurate
i was always told use a higher octane when you have higher compression. im pretty sure thats accurate
higher octane will stop detonation....higher compression motors are more prone to detonation but if you don't need the octane...your robbing power
taking out timing will do the same thing......but no one runs out to run 8* timing for the heck of it
03-25-2008, 08:28 AM
#15
1st Gear Member
Join Date: Dec 2007
Posts: 55
RE: HP gains changing timing to 14
I agree on teh 12* of timing. My car was running really crappy and somehow was set around 8* I had my buddy bump it to 12* so that i can still use 87 octane. (im not donald trump so paying 3.30 for regular gas is as much as i can spend) The car accelerates so much better now and under wot i havent gotten any detonatoin. So 12* is a good all around setting.
03-25-2008, 08:34 AM
#16
5th Gear Member
Join Date: Oct 2005
Location: Ohio USA
Posts: 4,616
RE: HP gains changing timing to 14
Thats becuase you have a 1995 lol,. The 95's like 12* for some dam reason.
The fox should be dynoed, you can rent a hour worth of dyno time and do a hell of alot of tinkering to dial her in[8D]
The fox should be dynoed, you can rent a hour worth of dyno time and do a hell of alot of tinkering to dial her in[8D]
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