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 Post subject: D15b7 build!!
PostPosted: Wed May 27, 2009 8:10 am 
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Joined: Wed May 27, 2009 8:06 am
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i just picked up a d15b7 for some build ideas i got for it and wanted some opinions on it and thankx

head ported polished decked and valve job
y8 manifold
gsr throttle body
dohc zc pistons
and maybe a a6 cam?

what do you think about it and do you think there will be any problems with this build?
Thankx


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 Post subject: Re: D15b7 build!!
PostPosted: Wed May 27, 2009 9:34 pm 
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looks pretty good. The a6 cam will work fine. Might want to get an adjustable cam gear to retard the cam about 2 degrees.

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 Post subject: Re: D15b7 build!!
PostPosted: Thu May 28, 2009 7:22 am 
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yeah ive herd they work just fine... but im having troubles finding one. i cant find one anywhere. also do you think there will be any probles with clearence with those pistons?


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 Post subject: Re: D15b7 build!!
PostPosted: Thu May 28, 2009 1:41 pm 
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The ZC, D15B1, D15B2, D15B6, D15B7, D16A1, D16A6, D16Y7, D16Y8, and D16Z6 all have the same bore. The difference is in the stroke.

Got this from searching around google
=======================================
D15 block / crank / rods + DOHC ZC pistons + B7 head + B7 head gasket = 9.2.6 compression
D15 block / crank / rods + DOHC ZC pistons + Z6 head + Z6/Y8 head gasket = 10.04:1 compression
D15 block / crank / rods + DOHC ZC pstons + Y8 head + Z6/Y8 head gasket = 10.45:1 compression

D15 block / crank / rods / B7 pistons + Z6 head + Z6/Y8 gasket = 10.11:1 compression
D15 block / crank / rods / B7 pistons + Y8 head + Z6/Y8 gasket = 10.52:1 compression

The D16 pistons have a much lower compression height than the D15 pistons, so you have to have a huge dome to make the same compression ratio numbers. The DOHC ZC pistons' compression height is 1.7mm shorter than the D15B7's, so there's really no point in switching your pistons. Just use the stock pistons you already have and maybe a thin head gasket. If you can get your hands on the 2 layer Y8 gasket and a Y8 head, you'll make:

D15B7 bottom + Y8 head + Y8 2 layer gasket = 10.86:1 compression

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 Post subject: Re: D15b7!!!
PostPosted: Thu May 28, 2009 6:41 pm 
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sounds good are you going all motor or turbo or spray if all motor then try a y8 2 layer head gasket for more comp.


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 Post subject: Re: D15b7 build!!
PostPosted: Fri May 29, 2009 1:53 pm 
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sounds good with the y8 head... one question im running obd1 so what ECU would i have to use?


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