Thanks for the reply, not concerned with having high compression, I'd be happy with anything between 9:1 and 9.5:1, more concerned with things being too close more than Anything. The Pistons are .029" out the top was just wanting to know where they sit on a standard block. Cheers
Just trying to sort out this deck height problem, I have two spare standard rb25 blocks here at home both measuring 188.6mm deck height and both have .020" (0.5mm) piston out of the top of the block. So I'm assuming the rb25det has a negative deck height standard. So my current block I'm using is .029" (0.7mm) out the top with the cp Pistons I have meaning only 0.2mm) has been decked from the block. Can anyone confirm this?
Zebra could you calc using 17cc instead of the original 8cc stated?The stroke measurements were incorrect in a book he was using or something along those lines? It has now come up with 10.5 compression ratio with taking into account the .029" out of the block.( which is probably from being decked too much)
Head cc is 62.8cc
G'day just in need of some advice, currently having my rb25det rebuilt,
Mods relevant to the issue are
Cp Pistons Sc7305 86.5mm 9.0:1
Bridgeway forged rods
Block was decked
Been told Comp ratio is only 8.4:1 and pistons are .029" out of the block deck.
Any help appreciated. Cheers guys.
as title states, rb25det and gearbox wanted with all accessories, wiring,clutch/fly etc. must be 96 onwards , will look at whole damaged car if the price is right. need to hear running. cheers.
msg/call: 0487587833