spooledup Posted April 19, 2011 Share Posted April 19, 2011 im lookin for 1.5mm oversized valves for an rb25 head anyone know where to get titaniun vavles??? and will i have enough piston to valve clearance if i use standard length valves and the tomei 2.8L stroker??? Link to comment https://www.sau.com.au/forums/topic/361491-oversized-vavles/ Share on other sites More sharing options...
bigmikespec Posted April 19, 2011 Share Posted April 19, 2011 Yes and maybe. Hope you got deep pockets, not only won't they last long but you are looking at $300 each for a valve. Link to comment https://www.sau.com.au/forums/topic/361491-oversized-vavles/#findComment-5769927 Share on other sites More sharing options...
JKR-32 Posted April 19, 2011 Share Posted April 19, 2011 Yes and maybe. Hope you got deep pockets, not only won't they last long but you are looking at $300 each for a valve. f*ken ouch! Link to comment https://www.sau.com.au/forums/topic/361491-oversized-vavles/#findComment-5769971 Share on other sites More sharing options...
spooledup Posted April 21, 2011 Author Share Posted April 21, 2011 im not worried about the funding... im pretty sure ive found sumwhere to get em from... just hoping this build will work. 2.8L stroker, 260 duration 10.5mm lift, 1.5mm oversized valves... twin 35/40s and a comap ratio of about 8.4:1 Link to comment https://www.sau.com.au/forums/topic/361491-oversized-vavles/#findComment-5773267 Share on other sites More sharing options...
N1GTR Posted April 21, 2011 Share Posted April 21, 2011 Hope you've got grip sorted out, youll need it. I looked at getting oversized valves made up last year. Best bet is to send an RB26 one to whoever youre going to use, then tell them to work from that as a base. Once youve got them done, give them to your machinist with the rest of the motor and then he can cut valve reliefs while doing dummy assembly. Why use Ti though? Link to comment https://www.sau.com.au/forums/topic/361491-oversized-vavles/#findComment-5773281 Share on other sites More sharing options...
spooledup Posted April 21, 2011 Author Share Posted April 21, 2011 Hope you've got grip sorted out, youll need it. I looked at getting oversized valves made up last year. Best bet is to send an RB26 one to whoever youre going to use, then tell them to work from that as a base. Once youve got them done, give them to your machinist with the rest of the motor and then he can cut valve reliefs while doing dummy assembly. Why use Ti though? im going for a big power build... something close to the HKS drag 33, i want it to hold together Link to comment https://www.sau.com.au/forums/topic/361491-oversized-vavles/#findComment-5773288 Share on other sites More sharing options...
UWISSH! Posted April 21, 2011 Share Posted April 21, 2011 heaps of people are making big power like that without titanium valves tho Link to comment https://www.sau.com.au/forums/topic/361491-oversized-vavles/#findComment-5773490 Share on other sites More sharing options...
N1GTR Posted April 21, 2011 Share Posted April 21, 2011 ^^^Yeah thats what i was getting at. Get some Naprec valves in there and spend the money somewhere else is my vote. Please keep us updated though sounds like an awesome project Link to comment https://www.sau.com.au/forums/topic/361491-oversized-vavles/#findComment-5773619 Share on other sites More sharing options...
zebra Posted April 21, 2011 Share Posted April 21, 2011 Ti Valves will last 1500ks at best before they need to be thrown out and have the seats re cut. Link to comment https://www.sau.com.au/forums/topic/361491-oversized-vavles/#findComment-5773633 Share on other sites More sharing options...
T04GTR Posted April 21, 2011 Share Posted April 21, 2011 titanium aftermarket valves are not the best for longevity. if you are after some exceldyne do alot of the nascar stuff. or you could try ferrea Link to comment https://www.sau.com.au/forums/topic/361491-oversized-vavles/#findComment-5773716 Share on other sites More sharing options...
bigmikespec Posted April 21, 2011 Share Posted April 21, 2011 Ferrea are awesome and is what I got. Ti valve unless you want to rev to 10k and it to last a short period of time is the biggest waste of money. $300 each mate I have the quote if you want to see it, by the way there are 24 of them. Custom made from US same people that do the top NASCAR shit. Naprec is also no good. Titanium is only weight saving you can rev it higher (less mech losses as valve train light). Those cams are very short duration too for twin 3540s and lots of revs and power. Link to comment https://www.sau.com.au/forums/topic/361491-oversized-vavles/#findComment-5773871 Share on other sites More sharing options...
hkssam Posted April 24, 2011 Share Posted April 24, 2011 guys wot you think about BC stainless over-sized valves ? Link to comment https://www.sau.com.au/forums/topic/361491-oversized-vavles/#findComment-5777076 Share on other sites More sharing options...
zebra Posted April 24, 2011 Share Posted April 24, 2011 Titanium is only weight saving you can rev it higher (less mech losses as valve train light). . Not as big of an advantage in an RB being that the valve train is very light...well compared to a pushrod motor anyway To the guy above...I heared mixed reports about the BC valves, some of them are just rebranded quality brands, some are of lesser quality Link to comment https://www.sau.com.au/forums/topic/361491-oversized-vavles/#findComment-5777217 Share on other sites More sharing options...
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