Will Posted July 27, 2012 Report Share Posted July 27, 2012 I'll need to rebuild my 'ol L18, and the piston walls will need some cleaning-up. Does anyone have some larger-than-standard diameter pistons and rings for sale? Link to comment
Eagle_Adam Posted July 27, 2012 Report Share Posted July 27, 2012 have you checked rockauto? have you already honed/bored the piston walls? Link to comment
Will Posted July 27, 2012 Author Report Share Posted July 27, 2012 Rock Auto has 3 of the pistons left, for about 75 dollars each. I haven't honed and bored yet - I was waiting for some pistons so that the machine could match the new pistons to the block. have you checked rockauto? have you already honed/bored the piston walls? Link to comment
datzenmike Posted July 28, 2012 Report Share Posted July 28, 2012 I haven't honed and bored yet - I was waiting for some pistons so that the machine could match the new pistons to the block. That's the way to do it. Link to comment
Laecaon Posted July 28, 2012 Report Share Posted July 28, 2012 Becareful when buying new. As all L18 pistons I found are actually L20b pistons, IE too much dish for a L18. Try to get some STD late N/A 280zx pistons. Link to comment
Laecaon Posted July 28, 2012 Report Share Posted July 28, 2012 Try these pistons, ITM RY6134STD They are 86mm, so 1mm larger than stock. I am running RY6134-040 in mine, which are 87mmm. Makes it a L19 :) Couple with an open head gets some good compression going, (9.3:1) I got 4 from here for $150 shipped. http://www.autopartsgogo.com/products/1982-NISSAN--DATSUN-280ZX-6--2754+2.8L-Piston.htm Link to comment
Will Posted July 28, 2012 Author Report Share Posted July 28, 2012 Becareful when buying new. As all L18 pistons I found are actually L20b pistons, IE too much dish for a L18. Try to get some STD late N/A 280zx pistons. Thanks for the tip! My concern is the dishing amount too - I'll be using an SSS head which needed to be surfaced, so the combustion chamber is already small. Right now it is on an L16 block with flat-top pistons, and there is quite a bit of pinging. I did some calculations and it seems like the L18 pistons will have the right amount of dish. Link to comment
Laecaon Posted July 28, 2012 Report Share Posted July 28, 2012 Well if you are using a SSS head... I dont think they make L18 pistons anymore, other than what you can get from people who collect stuff, or from the dealer. well then 86mm L28 pistons early/turbo might be better, they have a little less dish than the L20b ones. Link to comment
Will Posted July 28, 2012 Author Report Share Posted July 28, 2012 Ah, I see... I do have some time to get parts together, so hopefully someone on here will have some spares kicking around. Pistons L18------------------- 38.1mm / 4.36cc dish / 85mm bore L20B------------------38.1mm / 11.36cc dish / 85mm bore L28 (early)---------- 38.1mm /10.90cc dish in 280Z, early ZX.('75-'80)/ 86mm bore L28 (late)------------ 38.1mm /0.0cc Flatop in '81-'83 ZX / 86mm bore Link to comment
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