NZ260Z Posted October 7, 2012 Share Posted October 7, 2012 (edited) Hey Guys, I haven't really posted here yet but have got a lot of information regarding my RB25det swap. It is generally going well, and I have most of the parts I need. To make intercooler plumbing tidy and have good throttle response I am going with a Greddy style front facing intake manifold. I did my research and had heard good things about the ISIS greddy copy and figured if Raw brokerage backed it it wouldn't be half bad (atleast better than the ebay specials). I know knock offs are never as good as the original and did expect to do some amount of fettling. Anyway, after offering the gasket up, the runner ports are well out as you can see in the attachments. Removing the material with a die grinder will be ok, but my concern is there are large portions where the gasket over hangs the ports by a few mm as there is no material there. (the ports are too large in places) I guess my question is how much will this effect performance? Can it be fixed? or am I better off getting another manifold? http://forums.hybridz.org/index.php/topic/98611-posting-pictures-please-read/page__pid__998203#entry998203 Edited October 9, 2012 by RB26powered74zcar http://forums.hybridz.org/index.php/topic/98611-posting-pictures-please-read/page__pid__998203#entry998203 Quote Link to comment Share on other sites More sharing options...
Snailed Posted October 7, 2012 Share Posted October 7, 2012 You could build up some material with a TIG machine and then shape it to match the gasket. How many mm does the gasket intrude into the port right now? Quote Link to comment Share on other sites More sharing options...
NZ260Z Posted October 7, 2012 Author Share Posted October 7, 2012 You could build up some material with a TIG machine and then shape it to match the gasket. How many mm does the gasket intrude into the port right now? A few mm in places 1-3mm depending. I could try getting it tig welded up, as I wouldn't trust any other material. I have seen epoxy used, but if it ever came off you can say goodbye to your engine. I may have to skim the gasket face after welding though. Cheers for the feedback mate. Quote Link to comment Share on other sites More sharing options...
rayaapp2 Posted October 9, 2012 Share Posted October 9, 2012 I am not a tig guy, but I wouldnt try tig welding these manifolds unless you knew someone you could trust to get it done right. The material itself is low quality. There are lots of folks on here that just check the mating surface and slap it on. I would suggest the same. I have a real GReddy and an ISIS. The gains in welding those to port match or even gasket match are not much unless you are going to shoot for a serious race build. The most I did was clean up (grind down) the casting inside runners, and the plenum. I didnt bother messing with the gasket areas much. Just my 2cents worth. Quote Link to comment Share on other sites More sharing options...
NZ260Z Posted October 14, 2012 Author Share Posted October 14, 2012 I am not a tig guy, but I wouldnt try tig welding these manifolds unless you knew someone you could trust to get it done right. The material itself is low quality. There are lots of folks on here that just check the mating surface and slap it on. I would suggest the same. I have a real GReddy and an ISIS. The gains in welding those to port match or even gasket match are not much unless you are going to shoot for a serious race build. The most I did was clean up (grind down) the casting inside runners, and the plenum. I didnt bother messing with the gasket areas much. Just my 2cents worth. Cheers for your feed back. I may just end up doing that. I do have a guy that I would trust to weld it and resurface the mating face. Wouldn't cost me muc, but don't want to put him out if the outcome isn't really worth the effort. I guess I like to do things properly, but i'm only after around 220kw at the wheels as it is just a street car at the end of the day. Quote Link to comment Share on other sites More sharing options...
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