boostin280zx Posted September 6, 2006 Share Posted September 6, 2006 Alright, i had been running a stock '82 turbo motor in my car for awhile now until the rings went out and the blow by cause preigntion and a piston melted. I have a '82 NA f54 block in my car now but it needs new rings already so i'm just going to go ahead and rebuild it this time. I want to keep the NA block b/c the flat top pistons made the compression ratio wayyy better and the car had way more power. I talked to racetep and they have blueprints for the je and total seal gapless rings for the NA pistons. I'm pretty sure im going to get a set from them and have the top rings high heat coated. I know there are many differnt ring designs but i was wondering what other people have been using and which ones will take a lot of abuse??? And one more thing,i have asked a few different people and have got different answers. Is the only difference between a '82 Turbo f54 bottom end and a '82 NA f54 bottom end the pistons and rings???? Crank and rods are the same, right???? o yea, i plan on runnning only 15 psi max Will the NA pistons be reliable as long as fuel and ignition timing are good. I was running 15psi on the NA and it seemed to take it good, no pinging or anything. I have a ems to control the ign. timing and plenty of fuel to stay in safe a/f ratios and wideband and egt to make sure nothings going wrong. Quote Link to comment Share on other sites More sharing options...
jnjdragracing Posted September 6, 2006 Share Posted September 6, 2006 I would run the pistons designed for turbo / supercharger, they are forged aand the top ring is set lower down on the piston. The rings I have read about the gapless rings and want to try them sometime. I hear they give you more horsepower due to the fact they are not letting compresion through. Presently we run the file ti fit rings and I file mine top ring 24, bottom ring 26. Have not had any problems with this setup until I leaned the motor out and burned two pistons, due to the fact I think fuel pump messed, have replaced. Good luck John Quote Link to comment Share on other sites More sharing options...
TimZ Posted September 6, 2006 Share Posted September 6, 2006 Do a search on TEP before you spend money with them... Quote Link to comment Share on other sites More sharing options...
boostin280zx Posted September 6, 2006 Author Share Posted September 6, 2006 I guess my other option is boring out the turbo block and getting oversized forged flat tops and rings. I have bought a few things through TEP before and there stuff is really good, but some things are a lil expensive. Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted September 7, 2006 Share Posted September 7, 2006 I've run gapless rings in several engines and I wasn't all that impressed. Maybe for pro-stock where they run a new engine every race. They make a set for street use. IMO they are for race only and not well suited for blower/turbo applications. Quote Link to comment Share on other sites More sharing options...
boostin280zx Posted September 7, 2006 Author Share Posted September 7, 2006 So what are the differences between the 2 blocks??? Is it just the pistonsand rings???? Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted September 8, 2006 Share Posted September 8, 2006 So what are the differences between the 2 blocks??? Is it just the pistonsand rings???? You got it. Doug Quote Link to comment Share on other sites More sharing options...
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