Adriano Posted October 4, 2006 Share Posted October 4, 2006 Interesting.. Whats with the 2 lumps in front of each cam shaft on the cam belt then? It was an N/A that I had a look at, I wouldn't have thought the turbo head would be any different. ??? The cas still bolts to the front of the exhaust cam, but it has a different spline Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2554554 Share on other sites More sharing options...
Cubes Posted October 4, 2006 Share Posted October 4, 2006 yer not sure.. Maybe it was just the different designed cas or something. Not sure it was some time ago I looked at it. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2554571 Share on other sites More sharing options...
Spoolup Posted October 4, 2006 Share Posted October 4, 2006 As I am running R33 RB26 cams I have to use the R33 CAS. Adriano is correct with the R34 GTT head having smaller combustion chambers - mine is running 8.5:1 with ACL forgies. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2554588 Share on other sites More sharing options...
Alf Posted October 6, 2006 Share Posted October 6, 2006 Are there any differences in the 26 and 30 headgaskets? I have a VVT 25 head thats had the front right water jacket and oil gallery welded up and the water gallery shaped to suit the 30 block. There appears to be more thicknesses available for off the shelf MLS headgaskets for the 26. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2560364 Share on other sites More sharing options...
Cubes Posted October 6, 2006 Share Posted October 6, 2006 26 and 30 head gaskets are the same. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2561217 Share on other sites More sharing options...
Craved Posted October 6, 2006 Share Posted October 6, 2006 is there any issues running the RB25 gasket with the rb25det head? obviously the oil feed is different, and will be modified for VCT externally.. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2561925 Share on other sites More sharing options...
Cubes Posted October 6, 2006 Share Posted October 6, 2006 is there any issues running the RB25 gasket with the rb25det head?obviously the oil feed is different, and will be modified for VCT externally.. Nope. I'm running the Cometic RB25 head gasket on mine without issues (~40,000kms). The price difference between the rb25 and rb26 was considerable at the time. I got mine from memory for $150. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2561965 Share on other sites More sharing options...
Craved Posted October 6, 2006 Share Posted October 6, 2006 Nope. I'm running the Cometic RB25 head gasket on mine without issues. The price difference between the rb25 and rb26 was considerable at the time. I got mine from memory for $150. i got mine cheap but not THAT cheap ... the rb25 cometic im running on the rb25 in the car cost me $330 got some ACL piston rings, so its almost wash and build time prob 3 weeks Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2561971 Share on other sites More sharing options...
Cubes Posted October 6, 2006 Share Posted October 6, 2006 The engine builder put me on to them and thats what he was able to get the rb25 two for (Bl4ck32 and I). The rb26 I remember was up near $400. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2561977 Share on other sites More sharing options...
Alf Posted October 6, 2006 Share Posted October 6, 2006 Thanks for that Cubes. I've been looking at the cometic and ACL race series MLS gaskets, Prices ive got ranged from 210-350 for an RB30 MLS headgasket. is there any issues running the RB25 gasket with the rb25det head? Its not really an issue with a 33 25 VVT head that I've seen but there is a 1-2mm of sealing on a particular spot on the front right water jacket. That is when you use a 30 block. Just to be on the safe side I tigged the water jacket and VVT gallery up in the head and shaped it to suit the water gallery in the 30 block. Theres a min. 5-6mm of sealing now. It was a better option that trying to braze weld brass to the side of the block like in this pic. http://www.users.bigpond.com/twinvl/blockmod2.jpg Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2562386 Share on other sites More sharing options...
Craved Posted October 6, 2006 Share Posted October 6, 2006 i wont be welding up the head, an drilling it out, and replacing witha grub screw thats sealed, so incase i use the head again on an rb25 it will be usable Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2562489 Share on other sites More sharing options...
Cubes Posted October 6, 2006 Share Posted October 6, 2006 Alf, So what your saying is the head actually hangs over the edge of the block nd the water galley in the head comes damn close to the edge of the rb30 block. I've attached a pic of my unmolested block. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2562501 Share on other sites More sharing options...
Alf Posted October 6, 2006 Share Posted October 6, 2006 So what your saying is the head actually hangs over the edge of the block and the water galley in the head comes damn close to the edge of the rb30 block. Thats right. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2562607 Share on other sites More sharing options...
r33_racer Posted October 7, 2006 Share Posted October 7, 2006 woah alf thats exactly what i did to ours. haha i wasnt too keen on brazing the extra thickness to the block either. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2563398 Share on other sites More sharing options...
w0g7oy Posted October 7, 2006 Share Posted October 7, 2006 I heard the Non turbo rb30 pistons have less rings or sumting like that.. and dont cope with boost very well... wen i was gonna turbo my rb30e, i was being told that the compression had to be lowered a fair amount from 9.0:1 to around 7 or 8:1 to stop pinging and detonation... Why is it ok for a hybrid motor to have higher compression ratios? wont it ping/knock its tits off?? Jimbo Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2563413 Share on other sites More sharing options...
Adriano Posted October 7, 2006 Share Posted October 7, 2006 Whoever told you that didn't know what they are talking about I heard the Non turbo rb30 pistons have less rings or sumting like that.. and dont cope with boost very well...wen i was gonna turbo my rb30e, i was being told that the compression had to be lowered a fair amount from 9.0:1 to around 7 or 8:1 to stop pinging and detonation... Why is it ok for a hybrid motor to have higher compression ratios? wont it ping/knock its tits off?? Jimbo Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2563613 Share on other sites More sharing options...
mr_rbman Posted October 7, 2006 Share Posted October 7, 2006 I heard the Non turbo rb30 pistons have less rings or sumting like that.. and dont cope with boost very well...wen i was gonna turbo my rb30e, i was being told that the compression had to be lowered a fair amount from 9.0:1 to around 7 or 8:1 to stop pinging and detonation... Why is it ok for a hybrid motor to have higher compression ratios? wont it ping/knock its tits off?? Jimbo putting the 25/26 head on actually lowers the compression! Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2563763 Share on other sites More sharing options...
Cubes Posted October 7, 2006 Share Posted October 7, 2006 Why is it ok for a hybrid motor to have higher compression ratios? wont it ping/knock its tits off?? 1. Because its a hybrid motor. Better designed head that allows you to get away with a little more static comp. 2. Its all in the tuning. Simply throw a stock rb30et ecu on an rb30e that has a turbo bolted on to the side of it and try to push 14psi through it and it will almost certainly detonate. So tuning tuning tuning. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2563784 Share on other sites More sharing options...
Roy Posted October 8, 2006 Share Posted October 8, 2006 So the guys running the R32 RB25DE heads. What sort of power are you guys putting through the inelt manifolds...has anyone gone to an aftermarket one and noticed an improvement in response/power Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2564402 Share on other sites More sharing options...
Cubes Posted October 8, 2006 Share Posted October 8, 2006 So the guys running the R32 RB25DE heads. What sort of power are you guys putting through the inelt manifolds...has anyone gone to an aftermarket one and noticed an improvement in response/power Hey fancy seeing you in these neck of the woods. AM-Performance is about to drop an aftermarket plenum on his within the next week or two. Sky30 pushed 312rwkw through his r32 rb25de head running the stock exh. manifold and stock inlet manifold/plenum. Thats the highest I know of on the R32 RB20/25 style plenum. Link to comment https://www.sau.com.au/forums/topic/15420-r33-rb30-conversion/page/205/#findComment-2564419 Share on other sites More sharing options...
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