si-thee

do forged engines make more rattle type noises than a normal untouched engine??

cheers

bengreen85

not on my p1 no.

P1#1015

iTrader: (14)

Piston slap when cold or noisey in general?

rajscoob

iTrader: (1)

it is usual to get piston slap on cold start on forged engines....but the noise should go away once the engine is warm.

alcazar

iTrader: (2)

What rajscoob said^^^^^^

si-thee

never had a forged engine so was just checking, car runs,drives fine and not using any oil water ect...
just sounds abit rattly on left side but could also be coming from clutch?? because its more at the back of engine bay.
im the type of person that always notices the smallest of noises then does my head in until i find it

Curtis450

Yes as they have to expand more, there will be more slap and rough running when cold.

stanmo

iTrader: (1)

My old 2.5 build used to sound like a taxi on startup, with forged pistons, and were still slightly rattly even when warm.

The new Cosworth short block rattles for about a second, on startup (possibly until the oil has had time to be pushed around), then it goes away.

Maybe it's more a question of whether the block has been honed properly to accept the pistons ?

si-thee

well im glad nobody said its fu@&ed

Curtis450

It does depend though mate, before my forged piston actually LET GO, it slapped to hell, now I've rebuilt it with the same pistons but bigger obviously for the rebore.... it doesn't do it 'much' still sounds rough as hell cold, but nowhere near as bad as before.

Just goes to show, det , bad timing can and WILL destroy ANYTHING.

2.5STI

i think so mate. my new forged 2.1 stroker rattles on start up....and sounds like a diesel when warm.

Curtis450

depends what heads you got on as well, sti V4s have shims and they do make a little more noise than hydrauls.

bigarf

iTrader: (67)

your engine rattles on start up and sounds like a diesel even when warm.think i would be trailering it back to whoever built it if its that bad.

Olly.Wrx

iTrader: (10)

My forged 2.1 does make a rattling noise when its cold or hot.

I have been told its normal tho with the engine build i have.

Ian

iTrader: (10)

my 2.1 makes more noise than standard. have been told it is down to the pistons. just the make that was used is abit louder than other makes.