Piston Rattle

[mick1223]

Hi guys,

Just found out that my bottom end is fine and that the problem piston rattle..

my question to you guys which I cant find a answer for anywhere is how safe is it to drive with piston rattle.

The engine is a fresh rebuild with old pistons and rods but everything else is pretty much new.

its very faint sound to the car warms up then you can kind of hear it .

oh and its in a R32 GTR with a RB26DETT

Thanks all and if u have any questions ask me

Edited April 16, 2013 by mick1223

[Guilt-Toy]

probly a rod bearing.

[Ben C34]

Well i would be getting out sorted asap. Goes to show you can't cheap out on a rebuild, ends up choosing mire doing it twice. What about the other parts you claim are pretty much new? Maybe revisit those when its apart the second time.

[mick1223]

Everything else is new beside the oil pump because I have a jun one on order.

[mick1223]

probly a rod bearing.

He has told me its not a bottom end and had someone double check it

[portaz]

Well I would consider piston slap bottom end, seriously consider a different builder it amazes me he would put old pistons and oil pump in an rb26 I'm my opinion it should have stayed in pieces waiting for new parts due to the labour involved in pulling one out and stripping it down, anyway if it were mine I wouldn't drive it.

[StevenCJR31]

^^Agreed, i also think it is a bottom end bearing. . you need to get that motor sorted asap and dont drive it

[mick1223]

Why does everyone say bottom end. I just had my bottom end done.

Is it really that unlikely to be piston slap

[AngryRB]

certainly is some piston slapping going on in that workshop..

i think the 1st yr apprentice must of got that job..

[Ben C34]

When an engine is built, critical tolerances are measured, including bore to piston clearance.

If your engine was assembled with that out of spec, I would run as fast as possible from that guy!

[StevenCJR31]

Why does everyone say bottom end. I just had my bottom end done.

Is it really that unlikely to be piston slap

the pistons ARE part of your bottom end anyway!

wether it be pistons or bearings that motor is waiting to fail

[Blitz]

He has told me its not a bottom end and had someone double check it

Get a new engine builder, ideally someone that has some idea what they are doing

[Blitz]

Why does everyone say bottom end. I just had my bottom end done.

Is it really that unlikely to be piston slap

Simple answer, because pistons ARE part of the bottom end, something you need to understand unless you want this workshop to continue feeding you horseshit.

[R31Nismoid]

Yep +1 to Steve/Nick

Piston slap just means it was a shit build to start off with. In this day and age there shouldn't be any at all if the motor is built to correct tolerance.

[(OO)SKYLINE(OO)]

The engine is a fresh rebuild with old pistons and rods but everything else is pretty much new.

When an engine is built, critical tolerances are measured, including bore to piston clearance.

If your engine was assembled with that out of spec, I would run as fast as possible from that guy!

+1

Hence why it should be built with new Pistons and Rods.

[GTScotT]

Yep +1 to Steve/Nick

Piston slap just means it was a shit build to start off with. In this day and age there shouldn't be any at all if the motor is built to correct tolerance.

Agree.

I paid a good machinist to do my bores for this exact reason. Am using CP's in an SR and they are dead freaking silent.. They measured the pistons themselves and determined the bore size from there.

I've heard enough SR CP slap stories to last me a life time. Cheap shit builds.

[Roy]

Whats wrong with building an engine with used pistons. If they are in perfectly good working order and block machined appropriately with required rings.

But main point is it appears poorly machined and assembled...quite possibly have happened even with new pistons

[StevenCJR31]

^^ at least with new pistons there would be a valid warranty claim- using secondhand pistons the original engine builder could tell you to get stuffed, im all for using secondhand parts but im aware that im taking a chance

[lovelessnator]

I've got a forged 25 and mine has piston slap on cold starts but once upto running temp it's dead silent.

If its still got piston slap once at running temp I'm going to say its abit of a ticking time bomb!