fixitrod Posted December 10, 2003 Report Posted December 10, 2003 Explanation of piston trouble... Click Here !!! Quote
boonman Posted December 10, 2003 Report Posted December 10, 2003 Excellent find!! I do remember reading that sometime before. Quote
Checkmate Posted December 11, 2003 Author Report Posted December 11, 2003 that is a good reference site!! what would happed if my timing was TOO far advanced ?? maybe say +6 or +8 ?? Would even higher octane take care of that? if i understand correctly i need a higher octane due to my compression and elevation. how do you figure out what your timing does to that equation?? i have a pic of the pistons, but haven't found a place to host the images yet. Quote
boonman Posted December 11, 2003 Report Posted December 11, 2003 Advancing timing, increases the need for octane to go up. I don't think your timing is too far advanced, for race fuel that is. Pump fuel should never be run on anything more than 4..... Quote
Checkmate Posted December 11, 2003 Author Report Posted December 11, 2003 i got the images hosted Quote
Checkmate Posted December 11, 2003 Author Report Posted December 11, 2003 another... you cant really tell, but the left piston was starting to burn too (by the exhaust side) Quote
Nighty Posted December 11, 2003 Report Posted December 11, 2003 I measured 140 psi on both cilinders, my altitude is ->0<- sea level. +4 timing running octane 93 Quote
fixitrod Posted December 11, 2003 Report Posted December 11, 2003 I'm curious what the squish was? Quote
Checkmate Posted December 12, 2003 Author Report Posted December 12, 2003 Not sure what the squish was. how do i check it? and what should it be for the future? Quote
boonman Posted December 12, 2003 Report Posted December 12, 2003 Squish is the distance from the piston to the dome at TDC. It can be measured with a piece of solder that you would stick inside the cylinder and sin the motor over. Pull the solder out, and measure how thick it is after it just got smushed into the head by the piston. It is the most accurate way of checking it.... Quote
Big Mike NY Posted December 13, 2003 Report Posted December 13, 2003 Attributing to your problem was the fact that you did not re-jet for the colder temps. In colder conditions, do you have to lean down or fatten it up? Is it crucial to do so even if you are running a high enough octane? Quote
ridingorhiding Posted December 13, 2003 Report Posted December 13, 2003 Big mike yes the colder the fatter ur main. Quote
itsaripper Posted December 13, 2003 Report Posted December 13, 2003 Big Mike, A easy way to remember the jetting thing. When the temp goes down the jetting goes up. When the temp goes up the jetting goes down. The same with elevation, up go down, down go up. Now that you are real confused try to figure out the differenc between mikuni and kehin jets Quote
boonman Posted December 15, 2003 Report Posted December 15, 2003 Is it crucial to do so even if you are running a high enough octane? Octane does nothing for your jetting requirements. Unless you are runing an oxygenated high octane fuel (which I am sure someone would have brought that up just to be a dick) in which the fuel has a higher oxygen content therefore needing you to richen up the jetting a slight amount. Octane is a number that lets you know the fuels resistance to detonation, pre-ignition, or commonly referred to as spark knock... Quote
TeamBigginRacing Posted August 6, 2008 Report Posted August 6, 2008 Just flush it out with gas... i've never had a problem with mine!! take the motor out fill move the crank flip over and repeat till happy Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.