Ok, my motor is pretty new (13K miles, almost 1/2 are highway miles...focking school!)

anyway, I was under the impression that unless the sleeves have been beat up, or the motor is just old...you don't need to hone the cylinder walls before installing new pistons....yes, i know its SAFER to do so if u dont need to but...what do you think? Unnecessary? Or "Fool, don't take chances with your motor!!! "


I'm planning out a mild motor setup (jun2 intake cam/ itr exhaust cam) and i figured I'd up the compression a bit while i was at it...

Now originally I was going to use JDM ITR pistons...but seeing as they're "only" 11.1:1 CR, I looked into the endyn rollerwaves for a mid 11 range CR...

Then I moved on to look at CTR pistons...now they're a little higher than what I was looking for, but do you forsee any problems running them on the street? As long as I pay attention to fuel needs, and feed it 93+ gas, I would be ok right? perhaps the J&S to be extra safe...

Also, will there be any clearance issues with the Jun2 Cam?


thanks

 

if you are that pressed on bumping your comp up to 11:1 just get a mugen headgasket... thatll do it for ya.

you should not only just hone, but also overbore the cylinder when you change the piston size. you cant just slap an 81mm endyn piston in and call it a day. They are made of a different material than stock pistons, and therefore expand at a different rate/amount AND do not have the same piston-wall clearance requirments.

i am definetly not saying you CANT do it.... but if you decide to, gimme a call so i can come over and watch! ill bring some extra oil


[Modified by TurboR616, 6:31 AM 1/7/2002]

 

Gordon, I believe you need to hone to a certain spec even WITH the Endyn 81mm pistons. Not sure, tho.

If this is true, I don't see any sense in offering this piston. 81.5mm gives an extra 20-25cc in displacement, and it deshrouds the valve a little more..

 

i dont really kno why its available, i suppose there are people out there.. with brand new aftermarket sleeves installed that would like to run a stock bore ?!?!

 

riiiight. some people....

 

toda...

why dont you just build head... leave the bottom stock...

most of the power comes from the head... look at terry's car

 

Well I installed my JDM ITR pistons without reboring the sleeve. After taking several measurments for each bore, everything was well within specs. I did "clean" each sleeve with a honing tool and 400 grit stones but only to remove any nicks and scatch (as mentionned in the service manual). I ran about 12000 km on them before storing the car for winter and had no problems .

 

Hmm I guess I'm just seeing how much work is involved...I'll probably leave the block stock seeing as its a lot of extra work which I won't have the $ for...

But define "build the head" - I'm trying not to go too extreme