Hks Piston Clearances?

[Bumblebee]

any know what clearances HKS pistons (87mm step 2) like to run??

i know all about the rule of thumb clearances but some pistons like a lil more than others (material dependant)

so i need to know what clearances the HKS step 2 87mm pistons runs on an rb26

[GTRsean]

Torque plate hone etc, Tom at BD4's said to me they build em with 2 thou or less piston to bore clearance (HKS pistons).

I can only think they could go that tight if they are a high silicon content piston, and barrel shaped when cold like TOMEI pistons.

Also made to suit jap style tight engines, not yankee 10 thou or so clearance lol.

Correct me if I'm wrong guys...

Cheers.

[Bumblebee]

well i need to know the exact clearances as im not building a slapper motor. this thing will be making some serious power so it needs to be exact.

Thanks for ur advice dude. hope anyone else has something to add?

[Bumblebee]

nobody knows what the clearances should be??? theres gotta be someone out there thats running same pistons

[BLK33T]

who did you buy them off did they give you spec sheet with them or something???

call a local distributor for HKS for accurate advice IMO

[Bumblebee]

i tried that already and there was no spec sheet apparently.. and i called up hks and they couldnt help me.. they said that i needed to purchase the pistons directly frmo them for specs, otherwise no.

so hks australia wont help me, even thou i have theyre product.. nowhere else to turn to but the forums and hope for the best

[rb26s13]

i tried that already and there was no spec sheet apparently.. and i called up hks and they couldnt help me.. they said that i needed to purchase the pistons directly frmo them for specs, otherwise no.

so hks australia wont help me, even thou i have theyre product.. nowhere else to turn to but the forums and hope for the best

i'd ring hks australia up again and abuse the shit out of them untill you get the spec sheet.. if not.. get your machinist to ring up and ask for them

[Bumblebee]

hahah i tried again and it didnt work. but seriously theres got to be atleast 1 other person here who has hks pistons in theyre block.. gotta be!

[BoostdR]

2-2.5 thou

Depends on how hard the car is going to be run.

I would use a larger PTB for a tracked car over an all street setup..something like 3-3.5thou

Teflon coated skirts work well with tight PTB figures...however are not required.

[blind_elk]

I got ACL pistons, and they had the info stamped on the piston crown.

[Bumblebee]

the wont be running too hard i dont think. im really just after a bulletproof bottom end rather than the highest power figure in the world... reliability i think is the word?? hahah

im gonna go with 2.5 thou then and i always use teflon additives (slick 50 and my does it work) as well as top quality oils

[NXTIME]

yep, 2.5 thou.