franky240z Posted September 17, 2017 Share Posted September 17, 2017 Hi all. I've some pistons with the following specs 84mm bore Compression distance 1.379” Dome height 0.035” 0.6cc positive dome Intake valve pocket 0.120” deep x 12 degrees Exhaust pocket 0.110” deep x 12 degrees. I'm using an l24 block, l28 crank, l24 length rods. The pistons were designed as a 'cheat' gives me 2627cc. Big valve e31 head. This gives me a rod/stroke ratio of about 1.68 against a 1.8ish as standard. The way I understand it this is slightly 'better'? Or have I understood wrong? The other engines that ran these pistons were in a rally spec cars with no engine failures. Quote Link to comment Share on other sites More sharing options...
Dusty Posted September 21, 2017 Share Posted September 21, 2017 Yes slightly better. Have you calculated what you compression ratio will be? Quote Link to comment Share on other sites More sharing options...
Dusty Posted September 21, 2017 Share Posted September 21, 2017 (edited) Slightly better than l28 rod not as good as original l24 setup but nothing to get excited about Edited September 21, 2017 by Dusty Quote Link to comment Share on other sites More sharing options...
madkaw Posted September 21, 2017 Share Posted September 21, 2017 Care to share what pistons are from ? Or were these custom made? Deck height? Quote Link to comment Share on other sites More sharing options...
Dusty Posted September 22, 2017 Share Posted September 22, 2017 It's pretty amazing how little ots stocking parts there are for L engines. There are way more obscure engines out their that you have any array of choices for. Now almost any piston you can buy for a Chevy you would have to work at to spend much over $100 a piston unless talking exotic stuff. My Cosworth pistons for my Subaru were less than $200 a piston and they are over the top exotic. I understand economies of scale but certainly should be able to do better than the $1200+ I see advertised. Quote Link to comment Share on other sites More sharing options...
franky240z Posted September 22, 2017 Author Share Posted September 22, 2017 20 hours ago, madkaw said: Care to share what pistons are from ? Or were these custom made? Deck height? HI They're a custom made JE forged piston. Deck height over standard 0.035" but with valve pockets. with the other parts it should help make an interesting engine away from the norm. I'm trying to put together something revvy and fun feeling. Not and out and out HP build. Quote Link to comment Share on other sites More sharing options...
franky240z Posted September 22, 2017 Author Share Posted September 22, 2017 On 9/21/2017 at 8:44 AM, Dusty said: Yes slightly better. Have you calculated what you compression ratio will be? Works about about 10.5:1, I won't believe everything till the bottom end is built and measured as it could possibly be nearer 11:1. Quote Link to comment Share on other sites More sharing options...
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