D1AUS

No worries, thanks for your input guys, appreciate it.

Brad By all means i do appreciate all your help, thanks very much I'm just going by all the figures at the moment. Obviously, I will dummy everything up check chamber cc etc. Just by the specs, thats what i get from the calculation. I know standard rod is 152.5mm From your experience, what is the standard deck clearance for RB30? standard parts

Going for 8.5:1 with some head work. RB25 Head is going on

Thanks for the feedback mate, I assume they are a domed piston????????

Its not just a matter of simply using any rod. I'm trying to maximise the compression ratio etc with my setup. And with the calculations above and speaking to Distributor for CP in QLD. Standard Rods have a 3mm deck height according to this calculation. As the CP RB30 Pistons are Dished not domed. Thats my arguement here. Just trying to find out from others who have done this etc. I understand Spool Rods are of good quality, but just seeing the available options to maximise the setup, thats all. JD

So that calculation above is wrong then?????????????????????? RB30 Compression Height - 1.280" (32.5mm) RB26 Compression Height - 1.193" (30.3mm) RB25 Compresson Height - 1.240" (31.5mm) Using 152.5mm will yield 3mm Deck Clearance via that calculation Using 155.5mm will yield 0mm Deck Clearnace via that calculation Now thats even more confusing

But from my calculations, it is ok. RB30 Specs RB30 Deck Height - 9.075" (230.5mm) Stroke - 85mm Crank Throw - 42.5mm Compression Height - 1.280" (32.5mm) Using Spool/Argo Rods - 152.5 C/C Deck Clearance = 230.5 - 42.5 - 152.5 - 32.5 = 3mm Using RacingPartsFactory/Rod Factory Rods - 155.5 C/C Deck Clearance = 230.5 - 42.5 - 155.5 - 32.5 = 0mm Is that right by your calculations, therefore using either Rod, should not matter. However, if you see an issue of deck clearance, you can always use RB25/26 pistons instead, as they have the same bore, but a smalled Compression Height

Brad I spoke to you this morning about that, thanks for your help Rods Factory, i know they are on ebay are 155.5mm RacingPartsfactory.com also have them as 155.5mm Will using the 155.5mm Rods pose a problem? I know they are 3mm longer, i am planning on using CP 8.2 Flat top Pistons with them

Hey Guys In the stages or tearing my engine down, ready for a rebuild. There are a few retailes of RB30 Rods at the moment - SPOOL - ARGO - Rod Factory But whats got me confused is Centre to Centre: some have 152.5mm and some have 155.5mm Will either of the 2 work? Anyone else come across this and what have you done JD