Warpspeed

Thanks, I will check out Ogura.

Safety is the uppermost thing in my mind, and the reason for this thread. It looks like either a stock RB26DETT flywheel then, or one of the standard weight steel aftermarket ones. Thanks heaps REV210, that is the information I am after.

RB25, RB26, and RB30 all have 86mm bore. It is the RB20 that has the smaller bore. I also understand that the 4WD blocks are different from the "normal"blocks in that the pan rails are wider apart for the special sump. The RB26 crank is far heavier and more sturdy, it is also fully counterweighted, in other words there are two counterweights one on either side of every conrod. The RB25 crank is less strong and rather crude in comparison. Still a bloody stong crank though ! I also need to lower the RB25DE compression from 10.5 down to 8.5 (guess why). By putting all the RB26DETT stuff into an RB25 block I get to keep the same engine number (hee hee) and no one will ever know. I just want to make sure the flywheel is not going to be the weak link. It iwill all be going into a 33GTS-4.

Thanks Mega. I am new to skylines and still have a lot to learn. My thoughts are that a bog stock RB25DE may have a nasty flywheel, where an RB26DETT may have something far better that is not going to go out through the windscreen at 8000RPM. As you say, the RB motors probably all have a similar sized flywheel, but the quality of material may vary. I have actually seen a cast grey iron flywheel split in two when accidently dropped onto concrete (woops !) Am planning to put an RB26 crank and rods into a GTS-4, and am just wondering if the stock flywheel is up to the job.

Does anyone know if the RB25 and RB26 flywheels are the same or interchangable. Also what are they made from, grey iron (unlikely), nodular iron, or steel ? Are the RB25 and RB26 pressure plates similar and/or interchangable?

Hi Meggala. Yes am still looking for a nice clean R33 GTS-4.

52, going on 1,000