VHR32 Posted November 14, 2006 Share Posted November 14, 2006 (edited) thanx for that VHR32, awsome site. but i dont know any of teh following values. head is rb25det VVT out of r33. Enter Bore/Stroke Designation Type 2 = Millimeters =2 Enter Cylinder Bore Size =86.5mm Enter Piston Stroke Length =85mm Enter Head Gasket Bore Diameter =87mm Enter Compressed Head Gasket Thickness =1.5mm Enter Combustion Chamber Volume In CCs =RB25=62.5cc Enter Piston Dome Volume In CCs Negative For Dished Pistons (Use '-') = ?? RB30E = -0.97cc dish ?? = 7.6:1 EDIT: This was worked out with a RB30E bottom end in mind because you posted it in the RB30DET thread, not your RB25 engine. Edited November 14, 2006 by VHR32 Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2669434 Share on other sites More sharing options...
Bl4cK32 Posted November 14, 2006 Share Posted November 14, 2006 RB25 gasket if you have a R33 RB25 VCT head.RB26 or RB30 gasket if you have R32 RB25 or RB26 head cubes and i are running an rb25 cometic gasket with our r32 rb25de heads.... I wish there was a sticky or document with all the right info on this shit, to stop ppl asking the same damn questions and others giving half answers.... OH WAIT - CUBES HAS A GUIDE Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2669753 Share on other sites More sharing options...
VHR32 Posted November 14, 2006 Share Posted November 14, 2006 cubes and i are running an rb25 cometic gasket with our r32 rb25de heads....I wish there was a sticky or document with all the right info on this shit, to stop ppl asking the same damn questions and others giving half answers.... OH WAIT - CUBES HAS A GUIDE ok, I added the RB25 gasket. I thought the others would be more common and cheaper to use so I left it out... Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2670567 Share on other sites More sharing options...
Sydneykid Posted November 14, 2006 Share Posted November 14, 2006 I put in 86.5, 85, 87 HG bore, 1.2 HG height, 65cc for RB26 (was a guess, some say they are 70cc? although CP measured some at 64.5cc avg) and 13cc dome.= 9.12 Im picking up my RB26 head later today so i'll have to measure the cc's! I have seen RB26 combustion chambers vary between 63.8 cc's and 64.7 cc's. So 64.5 cc's is OK for a rough calculation, but you should carefully measure the actual head and each combustion chamber. Cheers Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2670684 Share on other sites More sharing options...
Scooby Posted November 14, 2006 Share Posted November 14, 2006 Can someone with a good proven motor please tell me what BE and main clearances are recommend for an RB26/30. N1 pump, ACL race bearings, street and very occasional track use, and rev limit about 7250. Thanks for any help. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2671677 Share on other sites More sharing options...
Cubes Posted November 14, 2006 Share Posted November 14, 2006 A little update on AM-Performances GTS4 RB30DET. Made 270rwkw. http://www.skylinesaustralia.com/forums/in...t&p=2671762 Needs valve springs done. The plenum has widened up the power band noticeably even on 8psi where it made a lowly 182-188rwkw. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2671950 Share on other sites More sharing options...
mr_rbman Posted November 14, 2006 Share Posted November 14, 2006 A little update on AM-Performances GTS4 RB30DET.Made 270rwkw. http://www.skylinesaustralia.com/forums/in...t&p=2671762 Needs valve springs done. The plenum has widened up the power band noticeably even on 8psi where it made a lowly 182-188rwkw. well this shows that something is seriously not right with my car if he could make that power on less boost with the same cams! I'm depressed now! Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2672028 Share on other sites More sharing options...
Roy Posted November 14, 2006 Share Posted November 14, 2006 So for the price of my pistons and rods i could have had one of these motors ready to slot into my car ... fark im silly for being so stubborn with regards to wanting to be different Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2672030 Share on other sites More sharing options...
r33_racer Posted November 14, 2006 Share Posted November 14, 2006 just in round numbers what was the price of your pistons and rods? Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2672046 Share on other sites More sharing options...
Cubes Posted November 14, 2006 Share Posted November 14, 2006 well this shows that something is seriously not right with my car if he could make that power on less boost with the same cams! I'm depressed now! Ash.. unsure if you read the whole post in the dyno thread but a peak of 256rwkw was seen on 15psi. A little more boost and and tidying up of afr's and ign saw 270rwkw. And no adj. cam gears. Forget the exh. manifold. The plenum is what definitely appears to open up the top end. Then as Shaun said you hit 300-330rwkw on the stock exh. manifold and you then 'need' to go aftermarket. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2672063 Share on other sites More sharing options...
Cubes Posted November 14, 2006 Share Posted November 14, 2006 So for the price of my pistons and rods i could have had one of these motors ready to slot into my car ... fark im silly for being so stubborn with regards to wanting to be different Can still be done Troy! Head down to the wreckers and invest a hundred or two in a good second hand rb30. I bought my bottom end that came out of a running car that was still in great condition (had been arse ended) for $150. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2672071 Share on other sites More sharing options...
Craved Posted November 14, 2006 Share Posted November 14, 2006 which inlet plenum was he using joel? Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2672109 Share on other sites More sharing options...
Cubes Posted November 14, 2006 Share Posted November 14, 2006 He posted pics of it a few pages back. Some jun copy thing. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2672127 Share on other sites More sharing options...
Craved Posted November 14, 2006 Share Posted November 14, 2006 short runners im guessing then, could explain the mid range drop Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2672133 Share on other sites More sharing options...
Cubes Posted November 14, 2006 Share Posted November 14, 2006 yes short runners. I think the slight drop in mid range is probably the almost 2psi drop that was seen with the new plenum. Prior boost was almost 10psi then tailed off to 8. After the plenum it sat on a steady 8psi through out. Not sure why it was playing about prior. Interestingly there was no noticeable drop in off boost low rpm torque. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2672169 Share on other sites More sharing options...
Roy Posted November 14, 2006 Share Posted November 14, 2006 just in round numbers what was the price of your pistons and rods? Only 2k. But then add the cams, the crank, block, head, ARP studs, gaskets A stock RB30 bottom end with DE head tarted up...all because i dont want to change my strut brace Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2672194 Share on other sites More sharing options...
Cubes Posted November 14, 2006 Share Posted November 14, 2006 No need to change strut brace. Those plenums can be picked up for quite cheap. Throw any plenum on it and open up that top end. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2672200 Share on other sites More sharing options...
Roy Posted November 14, 2006 Share Posted November 14, 2006 Fark it spaceframe GTSt with a Judd V10 up front...time to build a shed Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2672207 Share on other sites More sharing options...
Cubes Posted November 14, 2006 Share Posted November 14, 2006 lol Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2672210 Share on other sites More sharing options...
Roy Posted November 14, 2006 Share Posted November 14, 2006 If someone elses Lotto numbers come up before mine and i see an old F1 engine in an R32 GTSt...i just want it known that i would have been the first if i had the bank Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/217/#findComment-2672243 Share on other sites More sharing options...
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