Fudgey

iTrader: (4)

some of you will will remember from jap fest when my mate gave me the keys to his liner and let me loose in it round combe

but failed to tell me that he had put a stage 2 turbo on, a welding tip inline with the actuator to increase boost and the fact that the top end was rattling...

anyhow that little lot resulted in one dead engine

i got him a deal on some .05mm oversize pistons, and got all the machine work carried out etc.

he rebuilt it and we then put it back in the car.

this was in october.

anyway, i rang him today to see how it was going...

he has done 110 miles of running it it so far, and had it MOT'd

now monday morning last week, he was drving down the motorway doing 60mph he tells me as he has not driven any faster than that while running it in.

anyway, it cut out on him and he couldnt restart it. it ran perfectly before that

he says he has done a compression test on it, thy cylinder nearest the bulkhead has 100 odd psi, the rest have around 30psi

i dont know what the fook is wrong, i told him to chack the cam timing on it before doing anything else.

his dad reckons it cold be the rings? could this be the case?

he said there was NO smoke when it cut out, so i dont think its that tbh, but not got any other ideas really other than the timing.

we didnt check the head tho when it was apart, as the ring lands had broke off of 4 out of 6 pistons so we kind of gathered it was that which was fucked.

does anyone have any ideas of what it could be?

he still owes me £400 for the pistons

Dan Cossie

Jap Cars relaible hey

furry

no idea fella but can sell ya an emgine from a r33 gts if ya want one

Fudgey

iTrader: (4)

how much mate?

Stavros

Why would 5 out of 6 piston rings fail?

Headgasket surely.

Why/how that would happen without either detting its tits off or whatever is beyond me though.

Bearing in mind RB25s are mega reliable and standard ones can knock out 500bhp+ with good reliability when set up right, something is very wrong there.

Fudgey

iTrader: (4)

he built it - that could be the answer

but for it to do 110 miles then die....

buggered if i know

Fudgey

iTrader: (4)

ill get the compressor out and try pressurising the cylinders

chip gave me some good advice to try before taking apart

Stavros

maybe he did the head bolts up with his fingers

Fudgey

iTrader: (4)

was thinking that too.

i know on some engines that you need to re-torque them after a bit.

is this the case with skylines?

furry

£750, tis a 63k from new engine, standdard car that has just had cambelt and set up by abbey motorsport. in swindon fella

Fudgey

iTrader: (4)

nice one mate, ill see what he says.

he still ows 400 for the pistons tho

PeterLucas

What about jumped cambelt tooth, bent valves hence no compression. Would explain why its on all cylinders!

JTECH James

iTrader: (13)

next step is try a cylinder leakage test, ive got the kit here if you want to travel to devon to pick it up

Fudgey

iTrader: (4)

which was the first thig i said about checking the cam timing.

but there is 30psi on em, if the valves were bent, then there would be fook all

Fudgey

iTrader: (4)

JTECHSAFF

cheers mate, i have a compressor so ill try and hook that up and see what i can find...

JTECH James

iTrader: (13)

turn the cylinder being tested onto compression so all the valves are shut ,and listen for where the air escapes, it may be the breather system if its rings, or throttle body for inlet valves, or exhaust for exhaust valves. take the plug out next door and see if that sees any pressure as it may be haed gasket ,but watch out it isnt leaking into that cylinder through a manifold! check if the coolant tank sees any pressure ,

loads of test to do that way , my kit shows a percentage of cylinder loss ,so you know how much is leaking.....

Fudgey

iTrader: (4)

cool
cheers mate

ill try and get over his this w/e