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Discussion Starter · #1 ·
Hi guys I just need to know whats the difference between those two.
I heard that the 10:1 are flat, but are they really flat FLAT!! :tongue:

I have a JDM sr20 but I'm not really sure of what compression is it.
I'm going turbo so I need to get that straight.

Thankss!!
 

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No D E T.
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10:1 pistons are just flat across, wish i took a pic of mine. the 9.5:1 pistons have like a 1/4" border around the edge, then step down like an 1/8th inch.

it wont matter going turbo, the difference is small, but the 10:1 will help with lag a little, just spool up a little faster.
 

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Just different!
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ralphy SE-R said:
Hi guys I just need to know whats the difference between those two.
I heard that the 10:1 are flat, but are they really flat FLAT!! :tongue:

I have a JDM sr20 but I'm not really sure of what compression is it.
I'm going turbo so I need to get that straight.

Thankss!!
Panita
The diference in the top is not much. The 10:1 pistons are flat and the 9.5:1 pistons are flat in the center but have about a 1/4" border that is a liitle bit higher than the center of the piston ( like a very little dish ).
Pito
 

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They're just cones!
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That pic would be just a little more useful with a cleaner 9.5:1 piston... j/k.

I don't believe that little dish counts for 1/2 a point in compression.
 

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Discussion Starter · #8 ·
GTRSentra said:
Panita
The diference in the top is not much. The 10:1 pistons are flat and the 9.5:1 pistons are flat in the center but have about a 1/4" border that is a liitle bit higher than the center of the piston ( like a very little dish ).
Pito
Hey thanks you guys!!

Pito tu posteas en carrito.net??
 

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Ironman
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Driven97 said:
I don't believe that little dish counts for 1/2 a point in compression.
Believe what you want. But you have nothing to go on.

The fact is that it does.
 

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Besides looking at the piston, is it possible to identify 10:1 CR engine from 9.5:1?
I have just swapped in an SR20DE. The engine is taken out from P-10 Primera JDM model 1992.
 

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Well, thank you anyway.
 
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