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Author Topic: Difference between 9A and KR rods & pistons  (Read 900 times)

Offline dan7

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Difference between 9A and KR rods & pistons
« on: 01 November 2009, 20:32 »
I know the 9A is 2ltr and KR is 1800. BUT, could I swap my KR rods for 9A ones to shorten stroke, to increase cc's?
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Offline DOA

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Re: Difference between 9A and KR rods & pistons
« Reply #1 on: 01 November 2009, 21:36 »
Doesnt work like that Im afraid. If they are shorter (no idea if they are but Id be surprised) you would just end up with a really low compression engine . What you need to get what I think your after is a longer throw crank with shorter rods.
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Offline danny_p

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Re: Difference between 9A and KR rods & pistons
« Reply #2 on: 01 November 2009, 22:08 »
rods are same length 144mm,   the differance to take account of the diffrent throw in cranckshafts was done by changing the compression hight of the piston
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Offline AudiA8Quattro

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Re: Difference between 9A and KR rods & pistons
« Reply #3 on: 01 November 2009, 22:23 »
So the pistons were shorter on the 9A?
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Offline danny_p

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Re: Difference between 9A and KR rods & pistons
« Reply #4 on: 01 November 2009, 23:36 »
grudion pin is slightly closer to the pison crown in the 9A when compared to a Kr
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