Guest Usmann A Posted November 21, 2004 Share Posted November 21, 2004 Hi all, just some pics of what 2+bar worth of boost, and stock motor look like. IMHO, the 2JZ stock rods are some of the nicest rods for a factory spec'd engine. Here are the results ... Link to comment Share on other sites More sharing options...
Alex Posted November 21, 2004 Share Posted November 21, 2004 Feck! Link to comment Share on other sites More sharing options...
Guest Usmann A Posted November 21, 2004 Share Posted November 21, 2004 we determind that a rod bolt failure, lost a rod cap, which bent the bolt remaining, and snapped the other as it seperated from th rod assembly Link to comment Share on other sites More sharing options...
Guest Usmann A Posted November 21, 2004 Share Posted November 21, 2004 LOL - feck I know Link to comment Share on other sites More sharing options...
Guest Usmann A Posted November 21, 2004 Share Posted November 21, 2004 Pistons in half. Link to comment Share on other sites More sharing options...
Guest Usmann A Posted November 21, 2004 Share Posted November 21, 2004 Last one Thats what 650lb/ft torque does ... Link to comment Share on other sites More sharing options...
Guest Usmann A Posted November 21, 2004 Share Posted November 21, 2004 Ps, sorry guys crap focus .. Link to comment Share on other sites More sharing options...
MONKEYmark Posted November 21, 2004 Share Posted November 21, 2004 Originally posted by Usmann A Ps, sorry guys crap focus .. you can say that lad Link to comment Share on other sites More sharing options...
Guest Usmann A Posted November 21, 2004 Share Posted November 21, 2004 LOL- true, all in the name of research. Link to comment Share on other sites More sharing options...
absz Posted November 21, 2004 Share Posted November 21, 2004 i'm sure a bit of glue tack will put that right? Link to comment Share on other sites More sharing options...
dandan Posted November 21, 2004 Share Posted November 21, 2004 We're you running stock rod bolts the?!? What revs were you running to, and at what boost? Link to comment Share on other sites More sharing options...
Soop Dogg Posted November 21, 2004 Share Posted November 21, 2004 You look like you've got the same wooden flooring as I have in my lounge!! Link to comment Share on other sites More sharing options...
Guest Usmann A Posted November 21, 2004 Share Posted November 21, 2004 Yes stock rod bolts, means stock bottom end, revs max were 7K. took it too 7200 rpm once, but it gained no power(small intercooler possible slight valv bounce), hence 7k max. boost was just over 2.1 bar. totally untouched motor bar camshafts .. brian, yes I do ,lol Link to comment Share on other sites More sharing options...
Jake Posted November 21, 2004 Share Posted November 21, 2004 Originally posted by Usmann A just some pics of what 2+bar worth of boost, and stock motor look like. Ali, Just wondering.... You said before that this damage was caused by a failed oil pump, right? Would it be fair to say that this damage could have happened to a stock motor and that the 2+ bar was nothing to do with it? Link to comment Share on other sites More sharing options...
Guest Usmann A Posted November 21, 2004 Share Posted November 21, 2004 No Jake, that was first assumption, but when I took the head off, I could tell there was no shortage of oil.inspecting cams. Once down to the bottom end, It was blatant that lack of oil wasnt th issue. It was mechaincal failure of rod bolts. Yes Boost does not directly hurt a motor, due to compression stroke the load is not as high, as compresssion builds up slowly, and soon aftr TDC when the combustion has finished, th load changes from tensile to light compressive load. If all is tuned right, as it doesnt put any extra comprssive loads on the rods, which see most stress at TDC on exhuast stroke. But, you have to understand that the byproduct of big boost with big fuel, the right tuning= big power/torque, which is the force exerted on the crank by the rods on the power stroke. Link to comment Share on other sites More sharing options...
Jake Posted November 21, 2004 Share Posted November 21, 2004 Thanks Ali, Yes I understand all that. It was just that I remembered you saying that the oil pump had let you down and I was thinking "Well that could've happened on a stock motor" Thanks for clearing it up. Link to comment Share on other sites More sharing options...
Guest Usmann A Posted November 21, 2004 Share Posted November 21, 2004 Sorry for the boring reply. Yes, oil pumps on th 2JZ are pretty darn good.(CW ) Eventhough, the 2JZ is a STOUT piece .. Link to comment Share on other sites More sharing options...
Matt Harwood Posted November 22, 2004 Share Posted November 22, 2004 Nice one Usmann, you certainly did it in style! Shit happens, the only way is up! I've saved that picture for posterity! And to remind me to fir decent rod bolts! Link to comment Share on other sites More sharing options...
Ian C Posted November 22, 2004 Share Posted November 22, 2004 2.1bar boost you loon. Surely you got more than 650ft/lbs out of it at that level though, unless it was losing power due to it being too much boost? You've got a beefy turbo from what I recall... -Ian Link to comment Share on other sites More sharing options...
Guest Usmann A Posted November 22, 2004 Share Posted November 22, 2004 LOL- glad to be of help Mr Harwood Its certainly a way to go, the block is scrap, and changing everything on it, nothing remaining on the car which isnt new. absolulte entire rebuild, ancilleries etc. havnt touched the Getrag. Link to comment Share on other sites More sharing options...
Guest Usmann A Posted November 22, 2004 Share Posted November 22, 2004 Hi Ian, that was masured at th hubs mate. the turbo is 74GTS. Link to comment Share on other sites More sharing options...
dude Posted November 22, 2004 Share Posted November 22, 2004 Ive been running a stock bottom end with ARP bolts at over 2 bar and never lost an end yet !!!! ALL my probs have been due to the ceramics coming off the plugs , heres a photo of the result of running 2++ bar IMO !!! Dude:flame Dev Link to comment Share on other sites More sharing options...
Guest Usmann A Posted November 22, 2004 Share Posted November 22, 2004 Dude, sorry I disagree, ARP rod bolts= stock bottom end, dont think so mate. Pls lets mean stock, when we say stock. Link to comment Share on other sites More sharing options...
Miguel Posted November 26, 2004 Share Posted November 26, 2004 Thats what i like to see a comparison back to back ...Usmann with total stock and Dude with stock + ARP.......amaizing how strong the bottom end can be with or without ARP's ...just the ARP's give a little more insurance:thumbs: Link to comment Share on other sites More sharing options...
Guest Usmann A Posted November 26, 2004 Share Posted November 26, 2004 Yep, I agree. ARPs seem to have served dudey well, howmany blocks you been through now dude? only joking comparisons true, im not saying all 2JZs will fail as bad as this, but hey you never know. its good to see what works and what doesnt, for us its all about pushing, and testing to see the results. Link to comment Share on other sites More sharing options...
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