Ollieh17 Posted September 29, 2015 Share Posted September 29, 2015 Firstly, these pistons arent for a starlet but there isn't alot of info out there for gttis and didnt know where to ask. I have a set of wossner forged pistons that were custom made to fit the standard bore. However ive tried two blocks and the clearances are at 6thou despite being standard bore size. The pistona do slap when cold and but before stripped the engine didn't smoke.Wossner have very little info on the pistons as they were custom made and cost £990!! Going off the clearance given by wossner for starlets 0.07mm these are double that. Quote Link to post Share on other sites
Ollieh17 Posted September 29, 2015 Author Share Posted September 29, 2015 Machine shop said they should be okay to use, but may burn oil now they have been disturbed. Still waiting on news from wossner. Any opionons ? Quote Link to post Share on other sites
pockrockgtti Posted September 29, 2015 Share Posted September 29, 2015 Speaking from vast experience with gtti's. Id just stick with the oem daihatsu pistons. They are forged as standard. Quote Link to post Share on other sites
lukEp Posted September 29, 2015 Share Posted September 29, 2015 http://pages.ebay.com/link/?nav=item.view&id=321874601445&alt=w Quote Link to post Share on other sites
Ollieh17 Posted September 29, 2015 Author Share Posted September 29, 2015 Semi-forged. I have a set of standard pistons. But as i have a set of forged rods and pistons both custom made i dont want to waste them! Other option is buy oversized pistons if available Quote Link to post Share on other sites
pockrockgtti Posted September 29, 2015 Share Posted September 29, 2015 I wouldnt like to reuse those wossner pistons with all that pitting from det. The only other option i can think of is to sleeve the block, which would be costly. Or you could trawl through wossners catalgue and find a set of pistons off another engine that are slightly bigger, and then have them machined to fit. Quote Link to post Share on other sites
Ollieh17 Posted September 29, 2015 Author Share Posted September 29, 2015 Machine shop said its likely debris caused it and they can smooth,polish and balance them all up. There is very little out there that fits. Theres some honda pistons but drop the conpression a fair bit. And untested pistons from italy Quote Link to post Share on other sites
AdamB Posted September 30, 2015 Share Posted September 30, 2015 (edited) Have the cylinders been machined at all or have you just dropped them straight in the bores and measured? Do you have a spec sheet for them at all? Reason I ask is it might state on there the material being used, I'm sure that Wossner tend to use 4032 Alloy which contains more Silicon to enable tighter clearances and less slap, however if 2618 are used they expand much more and might be the reason for the larger clearance until upto operating temperature. 2618 pistons are generally recommended for high load / race use only, realisticly due to the noise, oil consumption etc. Edited September 30, 2015 by AdamB Quote Link to post Share on other sites
Ollieh17 Posted September 30, 2015 Author Share Posted September 30, 2015 The cylinders should be standard size as removed standard pistons and rods from them. I believe the machine shop must have measured the pistons then the bores as the engine is in pieces.I have no spec sheet as they were in the car when i bought them and they were custom specced from wossner. The engine slapped fromCold but at temp was normally. No oil use or smoke and this as on the other block with even bigger clearances Quote Link to post Share on other sites
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