13-06-05, 22:50 GMT+10#1
does anyone know where to get a set of rb30det [20 thou] forged pistons in brisbane and how much
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calaisturbo.com.au - forged pistons
Started by vlt-rb20 · 13 June 2005 · 8 repliesPreserved from CalaisTurbo. Original authors and dates are shown; archived members are not current Holdcom accounts.
13-06-05, 23:31 GMT+10#2
the forged pistons shop?
seriously man - ring any engine parts supply shop and ask for RB30E (NOT RB30ET) forged pistons. LOTS of companies make them.
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14-06-05, 11:47 GMT+10#4
get em from www.horsepowerinabox.com (http://www.horsepowerinabox.com)
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14-06-05, 14:41 GMT+10#5
he said it's for an RB30DET.
because of the RB25 and RB26 having larger combustion chambers than the RB30 head, if you use ET pistons in a 25/30 combo engine you will get a really low CR of like 7.5:1 or something like that.
RB30E pistons bring it to a nice friendly 8.3:1 perfect for large boost applications.
9:1 is probably optimal with the twin cam head, but get up to 15psi + and it could be hard to stop the pinging, particularly with a smallish turbo. 8.3 is nice and provides a good safety margin with good off-boost driveability
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