Jellybean Posted March 7, 2016 Share Posted March 7, 2016 I had a search I know the Jun kit has Cosworth Pistons, rods pistons inhouse? Did I read somewhere the HKS kit is also made by Cosworth? Are any made from S312 vacuum melt ? Quote Link to comment Share on other sites More sharing options...
Wez Posted March 7, 2016 Share Posted March 7, 2016 You are correct about JUN, I dont know about the HKS stuff. If you do a search I looked into getting some new Cosworth pistons made up using their latest tech, I got a lot of emails going back and forth with Cosworth as I initially asked them about doing another run on the JUN spec units but was advised they were very old, hence the newer units, it was going to be a group buy but couldnt get enough people interested sadly. Quote Link to comment Share on other sites More sharing options...
Wez Posted March 7, 2016 Share Posted March 7, 2016 FYI part # PA1737 this is the old casting that were originally produced for JUN In JAN 2010 I had all pricing in place for 8 sets which were based on the newer Evo X pistons and included rings, pins, clips, skirt coating, anti det bands and polished crowns. Quote Link to comment Share on other sites More sharing options...
Jellybean Posted March 7, 2016 Author Share Posted March 7, 2016 thanks Wez, I think Partsbox on here had Cosworth pistons on special recently How do Cosworth compare to Mahle Pistons? Quote Link to comment Share on other sites More sharing options...
Wez Posted March 8, 2016 Share Posted March 8, 2016 Would be interesting to see which version they have, I am guessing they are the older JUN castings. Cosworth is a very well respected name in motorsport including F1, I believe Mahle are also used in motorsport, I would look into all factors like piston weight, construction, coatings etc and then decide Quote Link to comment Share on other sites More sharing options...
Nic Posted March 8, 2016 Share Posted March 8, 2016 Did I read somewhere the HKS kit is also made by Cosworth? The HKS stroker kit uses CP-Carrillo H-beam rods, not sure about the pistons, but they could be also. Quote Link to comment Share on other sites More sharing options...
Jellybean Posted March 9, 2016 Author Share Posted March 9, 2016 Ohhh Carrillo , I read the H beam design is a little stronger than the pin boss and the real strength behind their rods in comparison to other manufacturers is thier tight controls of the steel alloy (E4340) , tight adherence to heat treatment and shot-peening standards I wonder what is the max Stroke on the 2jz , probably tge tomei 3.6 kit ; if we knew rod length , piston compression height and piston deck Clearance we could calculate it I wonder are the stanard OEM rods , carbon steel ,cast , Aluminium , or PPF rods (Precision Powder forged)? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 9, 2016 Share Posted March 9, 2016 http://www.epi-eng.com/piston_engine_technology/piston_motion_basics.htm This is the basics, some maths, but it's a complex subject. Best pistons in my opinion are Omega from here in the UK. Cosworth and Mahle both do high end stuff but also do cheap stuff for the tuning market, dn't think the stroker Cosworth pistons contain much of their F1 technology HKS rods and cranks used to be made here in the UK by Farndon. All this stuff is available here in the UK if you want to assemble a kit with a mix and match using the best of everything. A 3.6 stroker is getting pretty extreme, and would prrobably justify a big valve head with bigger exhaust valves and fairly extreme (for a 3 litre) cams. Don't expect to rev it much. Quote Link to comment Share on other sites More sharing options...
Jellybean Posted March 9, 2016 Author Share Posted March 9, 2016 Farndon , thanks Chris ; knew I read they are made in the UK Out of curiosity how complex can a piston get ? Cosworth pistons with F1 Tech? I was under the impression a Piston with cooling voids in the crown would be about as complex as they get What price is an Omega piston? Cosworth is around 1000 gbp mark , Mahle is around 700 gbp ; 2618 aluminum alloy (the 2 barrel pistons are made form 4032) Mahle seem cheap Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted March 9, 2016 Share Posted March 9, 2016 Omega may have drawings for 2JZ pistons, I don't know, but you can ring and ask. F1 pistons are VERY trick: Quote Link to comment Share on other sites More sharing options...
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