Bumblebee Posted April 7, 2008 Share Posted April 7, 2008 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 Link to comment https://www.sau.com.au/forums/topic/213901-hks-piston-clearances/ Share on other sites More sharing options...
GTRsean Posted April 7, 2008 Share Posted April 7, 2008 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. Link to comment https://www.sau.com.au/forums/topic/213901-hks-piston-clearances/#findComment-3777371 Share on other sites More sharing options...
Bumblebee Posted April 8, 2008 Author Share Posted April 8, 2008 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? Link to comment https://www.sau.com.au/forums/topic/213901-hks-piston-clearances/#findComment-3777886 Share on other sites More sharing options...
Bumblebee Posted April 8, 2008 Author Share Posted April 8, 2008 nobody knows what the clearances should be??? theres gotta be someone out there thats running same pistons Link to comment https://www.sau.com.au/forums/topic/213901-hks-piston-clearances/#findComment-3779566 Share on other sites More sharing options...
BLK33T Posted April 8, 2008 Share Posted April 8, 2008 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 Link to comment https://www.sau.com.au/forums/topic/213901-hks-piston-clearances/#findComment-3779621 Share on other sites More sharing options...
Bumblebee Posted April 8, 2008 Author Share Posted April 8, 2008 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 Link to comment https://www.sau.com.au/forums/topic/213901-hks-piston-clearances/#findComment-3779641 Share on other sites More sharing options...
rb26s13 Posted April 8, 2008 Share Posted April 8, 2008 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 Link to comment https://www.sau.com.au/forums/topic/213901-hks-piston-clearances/#findComment-3779837 Share on other sites More sharing options...
Bumblebee Posted April 9, 2008 Author Share Posted April 9, 2008 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! Link to comment https://www.sau.com.au/forums/topic/213901-hks-piston-clearances/#findComment-3782408 Share on other sites More sharing options...
BoostdR Posted April 10, 2008 Share Posted April 10, 2008 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. Link to comment https://www.sau.com.au/forums/topic/213901-hks-piston-clearances/#findComment-3784419 Share on other sites More sharing options...
blind_elk Posted April 10, 2008 Share Posted April 10, 2008 I got ACL pistons, and they had the info stamped on the piston crown. Link to comment https://www.sau.com.au/forums/topic/213901-hks-piston-clearances/#findComment-3784770 Share on other sites More sharing options...
Bumblebee Posted April 10, 2008 Author Share Posted April 10, 2008 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 Link to comment https://www.sau.com.au/forums/topic/213901-hks-piston-clearances/#findComment-3786370 Share on other sites More sharing options...
NXTIME Posted April 10, 2008 Share Posted April 10, 2008 yep, 2.5 thou. Link to comment https://www.sau.com.au/forums/topic/213901-hks-piston-clearances/#findComment-3786387 Share on other sites More sharing options...
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