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Old 27th April 2011, 08:45 AM   #1 (permalink)
Annon is back to a build started years ago :S
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Surprise after shopping for parts

So heres a scenario,

Got a whole bunch of parts e.g. je pistons, eagle rods, bearings blah blah blah for a rebuild of an engine. I pulled apart the block and sent it in to get machined and for them to assemble the short block as i have no precision tools to do myself.

As i was pulling the block apart i saw that everything had genuine nissan markings so i was pretty glad to see that the motor was still stock even though the car was purchased from a dealership and afew mods done to the car.

After i take it into the shop i get a call a week later saying that the crank is f**k'd and that the thrust surface on the crank is rooted :S (too many harsh gear changes?) thats ok i didnt mind that but then they told me that the cylinder walls have been bored out already and the clearance for the je pistons (86.49mm) is too much.

I need some advice on what to do from here?.....i need a new crank thats all good nothing much i can do here but what do i do about this piston situation.

Any input would be much appreciated.
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Old 27th April 2011, 09:06 AM   #2 (permalink)
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kk.....just an update

i just had a look at the service manual of the R32 RB26DETT and it says that the highest grade (3) of an OE piston is 85.985mm in diameter and the bore should be 86.030.

hmmmmmm.....

Did i just try and get dicked by this company?
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Old 27th April 2011, 01:56 PM   #3 (permalink)
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IIRC, you can get .5 oversize nissan pistons.
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Old 2nd May 2011, 02:16 AM   #4 (permalink)
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Sounds like the motor has had an incorrectly adjusted clutch at some stage and your block has already been bored to 86.5mm.

Forged pistons usually need slightly more clearance than stock postons so it is a little strange that your bore is already too big for the new forgies (unless it has alot of wear since the last bore). What clearance do they say you'd have with the new JE's if they gave the bore a quick hone?
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Old 2nd May 2011, 09:37 AM   #5 (permalink)
Annon is back to a build started years ago :S
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he couldn't exactly give me the measurement of the bore cause the worker thats working on my engine was away at the time of my call so i just bit the bullet and got some ross 1mm oversized. i need this car up and running in 2 weeks so everything is happening 320km/h :P hehe

oh and just a little side question.....you wouldnt happen to have an exhaust manifold that i can purchase off you for a t51r kai?
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Old 2nd May 2011, 09:49 AM   #6 (permalink)
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as rob says forged pistons need different (usually bigger) clearances especially je which i believe expand quite a bit on heat up as they have low silicon content compared with hks there should have been a leaflet in with the pistons which states the clearance needed im not sure why he couldnt read that!
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Old 2nd May 2011, 10:01 AM   #7 (permalink)
Annon is back to a build started years ago :S
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yeah i know what you mean and the leaflet in the je box stated that it should be at a clearance of 0.10mm min and more if need be but i didnt wanna go into details of who knows what with the guy so i just saved argument and got the 1.0mm oversized.
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Old 2nd May 2011, 08:12 PM   #8 (permalink)
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oh and just a little side question.....you wouldnt happen to have an exhaust manifold that i can purchase off you for a t51r kai?
Nothing sorry, I had someone ring me last week about it.
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Old 3rd May 2011, 02:18 AM   #9 (permalink)
Annon is back to a build started years ago :S
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Yeah that was probably me lol. U would happen to have a spare crank i can buy off you as well?
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Old 3rd May 2011, 02:39 AM   #10 (permalink)
R.I.P.S NZ is down to 7.48 @ 189mph with MGAWOT III
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26 or 30?
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Old 3rd May 2011, 03:39 AM   #11 (permalink)
Annon is back to a build started years ago :S
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26 mate
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Old 3rd May 2011, 04:34 AM   #12 (permalink)
R.I.P.S NZ is down to 7.48 @ 189mph with MGAWOT III
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nothing sorry
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