Thread: SR20de 9.5:1 CR with VVL head, What CR?

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2009-06-03 15:23:05

niZmo

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SR20de 9.5:1 CR with VVL head, What CR?

What CR will a SR20de lower half (9.5:1 CR) yield with a SR20ve head?

Thanks

Peace

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2009-06-03 17:02:06

Naghebe

Boost > VVL :(

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~10.3

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2009-06-03 17:08:45

autocroSER Online/offline status of autocroSER is unknown

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i think you might find the answer somewhere on the first page in this thread...

click here

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2009-06-03 19:33:37

THOR

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that motor is actually a 10:1 and not a 9.5:1 ........

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2009-06-03 20:48:25

vvl powr

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The head will bump your compression up a little more and like THOR said it will be a 10:1.

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2009-06-04 00:49:59

Andreas Miko Online/offline status of Andreas Miko is unknown

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Originally Posted by THOR

that motor is actually a 10:1 and not a 9.5:1 ........

If the SR20DE motor has 10 to 1 pistons in it, when you put on a SR20VE head the compression will be 11.3 to 1.

The problem here is the flat top 10 to 1 compression piston does not have valve releifs and the valves will hit the pistons sooner or later and more so if you go to bigger than stock SR20VE cams

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2009-12-01 03:19:30

SENTRASER

Hmmm...what goes here?

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Originally Posted by Andreas
If the SR20DE motor has 10 to 1 pistons in it, when you put on a SR20VE head the compression will be 11.3 to 1.

The problem here is the flat top 10 to 1 compression piston does not have valve releifs and the valves will hit the pistons sooner or later and more so if you go to bigger than stock SR20VE cams

Hey miko
what would de 9:1 pistons yeild with a 16ve head? The pistons I have are weisco det 87 pistons. Do I need to have valve reliefs cut in the pistons?

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2009-12-01 18:28:05

gtirwezz

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about 10.4:1 ^

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2009-12-01 19:34:39

P10FTW

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X2, I had a 10:1 block, the valves hit the pistons when I locked in the high lobes. It wasn't even close to clearing.

VE head on a 9:5:1 block would yeils somewhere a 10:3 ratio.

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2009-12-01 21:40:51

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blackb15

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Originally Posted by P10FTW

X2, I had a 10:1 block, the valves hit the pistons when I locked in the high lobes. It wasn't even close to clearing.

And that is why I'm doing no less than a full swap.

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