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Rb30det Forged Piston Sizes

salad

By salad,
in Engines & Forced Induction

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salad Veteran

salad

Posted
Posted

Hi, I've searched around a bit, but cant really find what I'm after.

I'm currently rebuilding my RB30DET but actually spending a bit of money this time. Anyway, I'm looking for forged pistons at the moment and I'm trying to find a company that makes them in standard size. Arias, CP and ACL all only make over size (0.5mm for the CPs and 0.5mm and 1mm for the Arias and ACL). The reason that I'm chasing standard size is my engine builder highly recommends that I dont bore it out if the bores are still fine now.

If it matters the rest of the bottom end is;

ACL Race Series bearings (mains and big ends)

Spool H-beam rods

GTR oil pump

And getting the whole thing balanced

Any thoughts on this? Some reasoning to back up the thoughts would also be appreciated.

Cheers

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datsqik Enthusiast

datsqik

Posted
Posted

The reason most companies dont make standard bore pistons for the rb30 is the age of the rb30 blocks. Most would simply been to worn to get the correct clearance and infact most rb30's ive had bored to 20 thou over will only just clean up and some ive had to move them a couple of thou off centre so they will clean up. Unless you have a new rb30 block sitting around then I'd be looking at going 20 thou over which isnt a problem anyway.

rockabilly Rising Star

rockabilly

Posted
Posted

hi mate. for the extra money its gonna cost you to get some custom pistons and the fact that each bore will be different due to wear i would go for a set from spool and rebore to suit..each piston will need to be measured and each bore needs to be bored to match each piston clearance..bernie

Risking Grand Master

Risking

Posted
Posted

ACL, CP etc etc do make 86mm pistons. CP are a custom order, can take 6 weeks to get them and ACL have them but they are usually 3-400 bucks more than 86.5's funnily enough.

High octane can source both brands in 86mm for you.

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