Hey guy

hai hai...

omg. mater. i feel like making him rust even moar

ah moon, why people wana tune it to rich during a race?

u wan to run a lean engine in races?

i think to keep the engine cool and smoother. So piston wont jammed

err... what do u mean in technical terms?

what has piston jamming got to do with fueling

yes u are right

what he mean is right...tune to be more slightly inject more fuel = cooler engine...

you guys are seriously wrong
although i cannot explain the concepts of pinging and predetonation, running the engine richer is not to stop your pistons from jamming. only running without ENGINE OIL will seize the engine.

he only mistaken about the piston jammed...but the cooling one is right...

and even then, it's not a proper answer to why you should run rich in racing.
cooler is one thing, but it also boils (no pun intended) to the internal pressures of the combustion chamber.

besides, you should have rectified him instead of agreeing 'yes you are right'.
such answers will only mislead other people into thinking that their wrong automotive concepts are wrong.

soli...my bad...

Sori my engrish not good...

bila run lean... dapat menyebabkan kebuk pembakaran menjadi sangat panas. Ditambah karakteristik pemanduan racing dengan menggunakan rpm tinggi.

Material piston dan piston wall yang terdiri dari bahan besi turut menjadi panas. Besi mengembang sikit berkadaran langsung dengan suhu. Piston ngan piston wall gap berkurang.

RPM tinggi = geseran permukaan piston terhadap piston wall semakin meningkat... Suhu meningkat

sehingga pada suatu tahap (Suhu sgt tinggi) gap antara piston dan piston wall menjadi sangat sempit, ditambah puturan piston yang mencecah 7000-8000rpm dan berakhir dengan piston jammed.



This post has been edited by tictac: May 19 2009, 04:49 PM

it shouldn't happen when the block is sufficiently cooled by your engine oil. if a block is able to warp till that extent, it shouldn't be racing in the first place.

well, piston mengembang berkadaran dengan suhu adalah benar kerana ia diperbuat oleh logam, tapi piston ring dan block/piston wall juga diperbuat oleh logam dan akan mengembang bersama-sama.

Hence, i dont see the actual major reason behind running rich during track race. But i would assume running rich is safer than running lean which of coz not too rich either. A safer buffer zone before it runs too lean and detonation/pinging happen and kill the engine prematurely during the race.

unless piston and the block is made out of different alloy which have different thermal characteristic
if not it should not jam

Taikor is always right....please listen to this guy