bajansuperman Posted August 8, 2014 Share Posted August 8, 2014 Hi I saw some forged 4e 9:1 comp pistons on the net and this got me thinking of a high compression bulid with boost, im not sure but I think the 5efhe is 9:1 can any give me some addvise on this thanks Quote Link to post Share on other sites
5e colin Posted August 8, 2014 Share Posted August 8, 2014 got a link to the pistons mate ???? it will work for sure there is a few of us na turbo 4efe going round so al up to the mapper he will make or break your engine Quote Link to post Share on other sites
mr_K Posted August 8, 2014 Share Posted August 8, 2014 Im running on wiseco flat top pistons 9:1 pistons on my forged glanza and they seem to be doing a pretty good job.im running td04 on low boost and it feels firm and there is only slight lag not as much as on dished pistons.Its a good way to reduce lag if forging and you dont want it to be lacking off boost Quote Link to post Share on other sites
AdamB Posted August 8, 2014 Share Posted August 8, 2014 Dished pistons are of a far better design in a turbo motor. They may be advertised as 9:1 compression but theres more than just the pistons that make up the compression ratio of the engine. You need to find out what headgasket size and combustion chamber volume they used to get their 9:1 estimation. Quote Link to post Share on other sites
bajansuperman Posted August 8, 2014 Author Share Posted August 8, 2014 http://m.ebay.com/seller?itemId=251259395915&sid=great-buy-guy Check that link im on my phone so a bit difficult to find the exact link Quote Link to post Share on other sites
bajansuperman Posted August 8, 2014 Author Share Posted August 8, 2014 Dished pistons are of a far better design in a turbo motor. They may be advertised as 9:1 compression but theres more than just the pistons that make up the compression ratio of the engine. You need to find out what headgasket size and combustion chamber volume they used to get their 9:1 estimation. How do I go about finding this out am lost to this Quote Link to post Share on other sites
AdamB Posted August 8, 2014 Share Posted August 8, 2014 You'll have to email them. The stock combustion chamber volume is 38cc (providing your cylinder head hasn't had a skim previously), plus whatever the stock dish is on the pistons. Then you will need to work out the volume provided by the headgasket thickness. Quote Link to post Share on other sites
mr_K Posted August 9, 2014 Share Posted August 9, 2014 Thats where i brought my parts from. Great-buy-guy..i think the 9:1 comp ration is based on stock engine setup. Stock headgasket thickness without any machine work.If you decide to buy make sure they dont try and rip you off on import charges. Quote Link to post Share on other sites
bajansuperman Posted August 9, 2014 Author Share Posted August 9, 2014 (edited) Thats where i brought my parts from. Great-buy-guy..i think the 9:1 comp ration is based on stock engine setup. Stock headgasket thickness without any machine work.If you decide to buy make sure they dont try and rip you off on import charges. Will do thanks for the info, did u have a bad experience with himYou'll have to email them. The stock combustion chamber volume is 38cc (providing your cylinder head hasn't had a skim previously), plus whatever the stock dish is on the pistons. Then you will need to work out the volume provided by the headgasket thickness.Ok thanks for the knowledge Edited August 9, 2014 by bajansuperman Quote Link to post Share on other sites
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