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COMPRESSION RATIO ISSUE

Discussion forum of the Nissan Ecology Orientated Variable Valve Lift and Timing engine. Discussion on all variants of VE engines including the VET and 20V models. Please also use this forum for all SRxxDE(T) specific questions.
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Funkie552
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COMPRESSION RATIO ISSUE

#38366

Post by Funkie552 » Tue Jan 30, 2018 9:54 am

HI GENTS QUICK 1
IM BUSY BUILDING A SR20VE MOTOR BUT IM USING SR16 N1 PISTONS AND I LIGHT SKIMMED MY CYLINDER HEAD ABOUT 0.8MM HOW MUCH COMPRESSION WILL I BE HAVING IF ANY1 DID THIS BEFORE AND IS IT SAFE FOR A DAILY DRIVE?

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sss4me
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Re: COMPRESSION RATIO ISSUE

#38369

Post by sss4me » Wed Jan 31, 2018 10:16 am

i used n1 pistons, metal head gasket, very lightly skimmed head, and make 270psi compression, which is probably around 12.3- 12.5 to 1. your gunna peg the gauge, your compression will be around 13.3-13.5 to 1. about the same as using a sr16ve piston on a normal head. timing may be a issue with petrol.

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Funkie552
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Re: COMPRESSION RATIO ISSUE

#38370

Post by Funkie552 » Thu Feb 01, 2018 11:39 am

Thanks bro for the help I'll let you how it goes

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TheStigP11GT
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Re: COMPRESSION RATIO ISSUE

#38371

Post by TheStigP11GT » Tue Feb 06, 2018 3:44 pm

I use N1 pistons on an N1 head, I shaved only 1mm off the crown, so no modification should be needed for a stock VE head. I am also using a Stock Head Gasket.

Mind if your using an SR20VE or SR16VE block and N1 Pistons, mind notch the pistons to clear oil squirters
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almeragt
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Re: COMPRESSION RATIO ISSUE

#38373

Post by almeragt » Wed Feb 28, 2018 12:58 pm

why don´t you measure the comp. ratio exactly, when you are building the engine? When We were building the engine, We did it and got exact numbers... If you for examble work on the comb. chamber, that can lower the compression... So CR can affect many things... This way /I mean to work with theoretical idea only/ it can be really dangerous - just my opinion...
I used forged CP Pistons what should get 12.5:1 CR, cylinder block + head was aligned and We were working on comb. chamber to lower the CR and improve combustion. We got to 12.6:1 CR measured exactly... If you get noticeable amount of money to the engine, to check exact CR is just a drop in the sea and you can be sure ;)

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