240gtr Posted February 4, 2007 Share Posted February 4, 2007 For those of you with forged internals, how reliable has your engine been? I ask because i need a rebuild but i am weary of putting forged pistons and rods in it. I have seen 4 built engines eat themselves in the past week (they were subaru engines though). The car is a weekend/nice day car with an occasional trip to the strip. Thanks, Brandon Link to comment https://www.sau.com.au/forums/topic/154856-question-for-built-engine-guys/ Share on other sites More sharing options...
GTshortie Posted February 4, 2007 Share Posted February 4, 2007 Got my engine rebuilt completed in November 2004 (rb25det), 33000kms after it still runs healthy no problems at all this is running 1.0bar of boost for circuit/street 1.30bar of boost for drags. Get below 20 knock on my pfc hand controller with the occasionally 25knock. CP Forged Pistons THICK metal head gasket (lower compression, i regret doing this) Shot-peened and leenished, crack tested rb25 conrods Link to comment https://www.sau.com.au/forums/topic/154856-question-for-built-engine-guys/#findComment-2879760 Share on other sites More sharing options...
itbmils Posted February 4, 2007 Share Posted February 4, 2007 For those of you with forged internals, how reliable has your engine been? I ask because i need a rebuild but i am weary of putting forged pistons and rods in it. I have seen 4 built engines eat themselves in the past week (they were subaru engines though). The car is a weekend/nice day car with an occasional trip to the strip. Thanks, Brandon Hey R32 GTR rebuilt 2 years ago (20,000klm) Wysco forged pistons N1 Bearings shot peen / balanced blah blah blah Tomei head gasket - std thickness (a good thing) running 1.2 bar all day every day (with N1 turbos) Only problem I have is my knock readings can get up to 60 - but it's NOT pinging - this may be the wyscos, or high clearances - not sure which Link to comment https://www.sau.com.au/forums/topic/154856-question-for-built-engine-guys/#findComment-2879785 Share on other sites More sharing options...
NickR33 Posted February 4, 2007 Share Posted February 4, 2007 light tune GTSt running around 200rwkw most days... rebuilt about 20,000km ago and have done about 4 motorkhanas and 3 track days (60+laps) with no problems... running Arias forged pistons and prepped/tested stock rods... the knock sensors go crazy on mine but I have been told the Apexi stuff is really sensitive and due to the rather large piston to bore clearances (as spec by Arias...you could probably go closer but meh)... on cold mornings there is audible piston slap and it generally idles a bit rougher than stock but I have a/m cams so that doesn't help it all depends on what you want in the future... if you have no plans for major power upgrades I would just run standard pistons, they are generally lighter and quieter than forgies Link to comment https://www.sau.com.au/forums/topic/154856-question-for-built-engine-guys/#findComment-2879882 Share on other sites More sharing options...
Blitz Posted February 4, 2007 Share Posted February 4, 2007 I have done 8,000 kms on my GTR engine since it was built in Sept 05. I use CP pistons and the engine is absolutely perfect - The only problem I have had since the build is a faulty CAS which I replaced with a brand new item. Link to comment https://www.sau.com.au/forums/topic/154856-question-for-built-engine-guys/#findComment-2879929 Share on other sites More sharing options...
240gtr Posted February 5, 2007 Author Share Posted February 5, 2007 Thanks for the replies guys, makes me feel better about putting some quality components in there. I noticed that you all are running CP, wiseco, or arias pistons. Anyone had any experience with JE pistons for the 26? I ask only because i can get a set of JE's with rings and Eagle H beam rods for $1040 U.S. Link to comment https://www.sau.com.au/forums/topic/154856-question-for-built-engine-guys/#findComment-2882718 Share on other sites More sharing options...
Chris_R33GTSt Posted February 5, 2007 Share Posted February 5, 2007 Do all forged pistons get piston slap when warming up, or is that just in the tolerances when the engine is being rebuilt? Link to comment https://www.sau.com.au/forums/topic/154856-question-for-built-engine-guys/#findComment-2882728 Share on other sites More sharing options...
Guilt-Toy Posted February 5, 2007 Share Posted February 5, 2007 all of them do it.. depending on the clearance they run to the amount of noise they get Link to comment https://www.sau.com.au/forums/topic/154856-question-for-built-engine-guys/#findComment-2882858 Share on other sites More sharing options...
r33_racer Posted February 5, 2007 Share Posted February 5, 2007 they dont all do it...my acls dont do it...i ran tighter then spec clearances both piston to bore and ring end gap and i dont get any slap. You get slap if you do it to the manufacturers spec...but it does depend on the application to which your running the motor as to what clearances you run. Link to comment https://www.sau.com.au/forums/topic/154856-question-for-built-engine-guys/#findComment-2883159 Share on other sites More sharing options...
silva33 Posted February 6, 2007 Share Posted February 6, 2007 i have a GTO running forged pistons and i get it on cold start up, then once it is warm you would think it was the stock motor.. It is a little off putting though on the cold starts with the 'rattle' Link to comment https://www.sau.com.au/forums/topic/154856-question-for-built-engine-guys/#findComment-2883574 Share on other sites More sharing options...
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