Overrev = motor death

Post by **Darius** » Wed Sep 20, 2006 10:35 am

Did you rebuild the bottom end when you put the pistons and rods in (i.e. new rod and main bearings)? I'm betting you'll be able to regrind the rod journals, buy stepped up bearings, and put it back together again for minimal cost. Did you have any type of oil restrictors in the block?

Post by **gawdzilla** » Wed Sep 20, 2006 12:14 pm

Darius wrote:Did you rebuild the bottom end when you put the pistons and rods in (i.e. new rod and main bearings)? I'm betting you'll be able to regrind the rod journals, buy stepped up bearings, and put it back together again for minimal cost. Did you have any type of oil restrictors in the block?

everything was rebuilt. used stock rods w/ arp fasteners. all nismo main and rod bearings. no oil restrictors, stock oil pump, good crank collar.

hopefully i can keep the costs down with a crank turn, new bearings, maybe new rod bolts and rods.

if i do rebuild it i'm going to get the oil restrictors and the pump. now that RBs are the new SR, will be much easier to get these parts than my first time around..

Post by **Phat_Optimo** » Thu Sep 21, 2006 12:54 pm

Sup BUD.. Long time no speak. Damn bad news man........Hard to tell without seeing the carnage. But it sounds like your oil system fuked up. Lots of heat and friction + no oil = fuked rod journals bearings ect. Hey if u pull it and want your crank reworked we can do it. We can make a stroker out of it and hard chrome the journals. Harder to spin a chromed journal. On my 26 we are planning loose oil clearances (1 big) and a big oil pump. Meh shortblock should be complete soon. BTW e-mail me if you decide to part it out. I'd like to scope the carnage. TTYL

Post by **gawdzilla** » Thu Sep 21, 2006 1:36 pm

Phat_Optimo wrote:Sup BUD.. Long time no speak. Damn bad news man........Hard to tell without seeing the carnage. But it sounds like your oil system fuked up. Lots of heat and friction + no oil = fuked rod journals bearings ect. Hey if u pull it and want your crank reworked we can do it. We can make a stroker out of it and hard chrome the journals. Harder to spin a chromed journal. On my 26 we are planning loose oil clearances (1 big) and a big oil pump. Meh shortblock should be complete soon. BTW e-mail me if you decide to part it out. I'd like to scope the carnage. TTYL

damn dude, you back from the grave? haven't seen you online in a minute... been through a car and a motor since we last talked haha... i sent you a mail to your gmail account. get online some time

Post by **gawdzilla** » Tue Oct 03, 2006 4:02 am

okay... so i take off the main girdle yesterday. see no damage at all.

take off the rod caps, nothing.

all the journals look fine, all the bearings look like they are used but nothing out of the ordinary.

leaked it down before i did anything to the bottom. all cyls fine holding good air w/ minimal leak.

pulled the pan, nothing in the pan.

wtf is going on

Post by **Shocker** » Tue Oct 03, 2006 4:35 am

stuck lifter?, my car scared the **** outta me yesterday.. started her up... granted its getting much colder here.. I hear a slight tapping.. sounds like low oil tap from lifters... check oil lvl is fine... I listen very very closely, comming from the back of the block on one side.. give her a slight rev, still there... one more.. gone... The whole time I was thinking I had a bent valve.. turns out it was nothing.... maybe same for you?

Post by **gawdzilla** » Tue Oct 03, 2006 4:38 am

it was definitely a loud clacking rotational noise, not a valve tick type noise. also, mine is solid lifter...

Post by **Carl H** » Tue Oct 03, 2006 4:39 am

cracked ringlands?loose wrist pin?i dunno man, what did it sound like when it happened?

Post by **Yellow4g63** » Tue Oct 03, 2006 4:42 am

Timming belt skip a tooth? Tensioner went to hell?

Post by **gawdzilla** » Tue Oct 03, 2006 4:53 am

sounded like this, and i'm not being biased towards the sound... (taken off someone on SAU).

http://smg.photobucket.com/alb...g.flv

TB tensioner, cracked ringlands, etc. would make me lose compression either through a bent valve or crazy blowby. i'm not getting those...

i highly doubt its a bent rod clacking off my cylinder wall just cuz the 26 rods are supposed to be beefy

Post by **Darius** » Tue Oct 03, 2006 5:28 am

That video link sounded like fingernails on a chalk board to me especially when he revved it a little. ugh.

Did you pull the pistons/rods to see if there is damage from interference or something breaking off in a cylinder?? It is hard to imagine that there is no damage to the bearings, leakdown is minimal, and you still have a loud knock like that. You could probably still get good leakdown numbers if the top ring land broke and the second ring was still in tact, but I still don't see that happening easily with forged pistons.

Post by **gawdzilla** » Tue Oct 03, 2006 5:54 am

i have no clue. did i blow the trans???

i could still put the car into every gear, but only drove it in 1st. the gear i missed was 3rd, and i never drove it again in 3rd to make sure it was still ok. still with a blown trans i'm not sure how it would make that kind of a noise

Website · Post by **USMCgetsome** » Tue Oct 03, 2006 8:01 am

has to be the motor. Never heard a transmission sound like that. Normally grinding or a loud whining noise. Never a clank. man that same thing happened to me after my belt slipped a tooth. I drove it around like that for months till i found out wtf it was. Fixed it and the noise went away. My idler pulley was the culperate. It siezed and broke the bolt that holds it. Fix all of it and noise went away.

Post by **Carl H** » Tue Oct 03, 2006 1:43 pm

sounds nasty, did you open to oil pump to see if something in there got damaged?perhaps a cam snapped under one of the cam caps?

Post by **gawdzilla** » Tue Oct 03, 2006 5:53 pm

ok... i finally got around to draining my trans fluid today cuz the drain bolt was stuck. at the time i figured F it just let it drain slowly as i lift it out of the car.

break the drain bolt loose and ... it is about twice the size as it was. big *** metal chunks stuck to the magnetic end of the drain plug. what a relief, blew the 3rd gear. i put the trans in neutral and rotate the input shaft by hand and feel it binding. same with 3rd gear.

i'm gonna get some arp moly and assembly lube and retorque my mains/rods. good thing i didnt go too far with the disassembly.

while i'm down there i'm going to get an n1 oil pump just in case and get some cams hopefully.

who would have known that a loud clak clak clak noise could be the trans?? lesson learned, right now i'm just relieved its not some mystery anymore and my motor is ok. i guess its time to shop for a new trans.

Post by **Carl H** » Tue Oct 03, 2006 6:01 pm

whoops.

Post by **s14 2510's** » Wed Oct 04, 2006 1:48 am

yha that beats internal work

Post by **Carl H** » Wed Oct 04, 2006 4:41 am

the odd thing is that he had a 'new' r34 rb25 gear box, that thing should have held power.just goes to show that its not the power that kills the box but the torque applied, doing full throttle shifts shocks the box from all the torque...that being said my rb20 box has held up fine and shifts perfectly but i dont full throttle shift and slip the clutch when launching it.

Post by **300Plus** » Wed Oct 04, 2006 5:22 am

So were you able to crank the motor and prove it was just the transmission or are you just hopping its just the transmission and not both ? Hope for the best! keep us posted

Overrev = motor death

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