Mark10sti

iTrader: (2)

Any how boys, I think fifer was asking for places to buy internals, not for a slanging match to ensue.

I got my parts from Import Car Parts

Staindrop Rd, West Auckland, Bishop Auckland
01388 834204

All of what you are after plus oil pump, timing kit and a couple of other bits for what I regard as cheap

rob84

iTrader: (5)

2618 forged Mahle 9.1comp Pistons in my road car all Bored and honed to correct sizes no noise at all really, Had 4032 in my last build and basically they broke, bent the ringland and a lump was missing out of one of them, Never again in my eyes will i use them in my own car

chopperman

Out of interest, what the spec, boost ect of the engine that broke 4032 forged ? Were the ringlands bent upwards or downwards ?

rob84

iTrader: (5)

2.5 sti .. Approx 50,000 miles on the engine 1.5 bar boost 16% methanol fuel, bent the ringland downwards on cylinder 2 split the liner and the missing piece of ringland on cylinder 4 was never found, happened on the first 1 1/2 tanks of v-power nitro on changeover.

chopperman

Damn, thats not good. Personally i've not heard of any others doing the same. Have you? 1.5 bar is not much to cause that. Thats what i would expect from an hydraulic lock. I had something similar on a bike which in the end i put down to a small end seizure as it cracked the top of the liner in my case. How easy did the wrist pin come out afterwards?

rob84

iTrader: (5)

Water ingression into the cylinders, as prior it did suffer white smoke on cold or hot start a few days before failure.... Heads are still in the workshop ready to be sent away for testing and skimming. Wrist pins were very easy to remove & no marks to them at all..

Had two instances with cracked liners, but admitted it's not very common.

chopperman

So it looks like an hydraulic lock due to water entering the cylinder ? Sorry for the questions but a good post mortem is a kink of mine

Alan Jeffery

We've demonstrated time and again that buying a built short block is a very sensible way of doing it.
The engine would be put together by someone with a stack of experience, and all the very necessary cleaning functions would have been carried out by someone with the right kit.
We'd be happy to quote for a block with this sort of finish;

rob84

iTrader: (5)

Yes certainly looks that way, hence why the heads i took off were never fitted to this engine, needed the car back on the road asap so bought some new ones, suspect there could be a crack between the spring seat and the exhaust valve.

chopperman

So if thats the case Rob, why blame 4032 alloy pistons? Surely any type of material would have suffered the same fate under those circumstances.

Steve's Sti

iTrader: (2)

ive 2618's little slappy when really cold but noise goes away quickly

rob84

iTrader: (5)

I suspect cylinder 4 broke before this instance, hence why I've never been able to find the missing piece of piston, the bizarre thing was no damage to the cylinder wall ? work that one out, I still have the block for future reference and to make a coffee table out of lol.

Cylinder 2 ringland was bent downwards and burst the cylinder wall, Water ingression, so not material fault as you state.

rob84

iTrader: (5)

Mine is still relatively new so no noise at the moment, but as it ages it will slap like mad i suspect but all is good

Steve's Sti

iTrader: (2)

you cant have it both ways lol

chopperman

I love those engine block coffee tables

leecalcars

iTrader: (37)

Engine tuner have built my. 2.1 full cosworth build brand new heads with extensive head work currently fitting full black up rated poly bushes 6 speed and a lot more couldn't ask for more really would definatly recommend .