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Rebuilding the L20B


Bugeye

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I have searched, and searched and haven't found a straight answer on this. Is there any gain in boring the L20 to 86mm to use 280z pistons? I already have my engine sitting in the hot tank. Im not looking to build a High HP engine, just something reliable. The head I am using is a closed chamber a87 with the L20 cam. Another thing is what would be the difference between the flat top pistons from the later model zx and the dished pistons from the early zx or standard 280? Or should I just replace the stock L20 dished pistons (2 of mine are chipped)

and please don't tell me to swap in a ka it's not the style of build I am going for on the 521

any and all input is welcome

Thanks

Donnie

Edited by Bugeye
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Silvolite makes pistons or used to .

 

flattops are to much for the street and you want to run cheap gas.

get the 280zx dished piston if you have to go to 86mm but see if Rockauto.com has L20 pistons and then run a closed chamber head. W53 or closed A87(ck as there are open ones)

 

http://kb-silvolite.com/spistons.php?action=Mfg4ci&mfg=Nissan&Div=Nissan&ci=119

 

call them as they will give a distributor. I paid 76 $ shopped maybe 5 years ago. Thats if they are still around. if not try the 280zx stuff

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Or you can just get a new set of pistons, run an easy to find open chamber head, cut .060 off two shims per tower, and call it good. Should be a mid 9 compression ratio which can still use 87 octane no problem. That's probably your cheapest option.

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L20B bored 1mm over would make a 1,997cc motor.

 

Above with 1mm over L20B pistons and closed chamber head........ 9.066 comp.

 

Above with 1mm over 280z/zx non turbo pistons and closed head... 9.11 comp.

 

Above with 1mm over 280z/zx turbo pistons and closed head ....... 10.86

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how about an L16 with a a87 closed chamber head?

stock pistons?

L-24 flat tops?

 

L20B bored 1mm over would make a 1,997cc motor.

 

Above with 1mm over L20B pistons and closed chamber head........ 9.066 comp.

 

Above with 1mm over 280z/zx non turbo pistons and closed head... 9.11 comp.

 

Above with 1mm over 280z/zx turbo pistons and closed head ....... 10.86

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