I got board before so I decided to pull the head off my old motor and have a look. Check out the colour of these little fellas,





It is caked on there. What do you think may have made this happen?

Also check how shiny these are, obviously from atmos vent BOV,

Never use octane booster just Bp ultimate. I had that thought but doesn't make sence. Bov causing fuel to be dumped into motor afaik this washes the oil off the bores and makes it bling like mine. Is this not correct?

Isn't running 98ron supposed to "help clean the engine" as advertised on the signs next to each pump?

have you owned the car since new?

then you don't know if it's ever had octane booster then.....

could also be from other fuel additives.

whats your issue with the bores?

the valves don't look like theyre overheated (other colour would normally be related to this) and since the plugs etc are the same tinge i would be thinking it's fuel related, though im sure this heads seen some heat,

the bores do look washed as your getting at but it is a old engine that has been running rich so what your saying is somewhat true about the bov, however generally running rich is alot worse then a back off fuel surge with the bov imo.

whats the plans for this engine? is it the one being built or just a spare now?

quote:

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Originally posted by xmr20

Bov causing fuel to be dumped into motor afaik this washes the oil off the bores and makes it bling like mine. Is this not correct?

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Forgot about the whole 'AFM/atmo bov' bog with the gen2s. doh!

a possible contributor, though I wouldn't point to it as THE sole reason

as Kameleon posted
"the bores do look washed as your getting at but it is an old engine that has been running rich
so what your saying is somewhat true about the bov,
however generally running rich is alot worse then a back off fuel surge with the bov imo."

Also consider oil quality and service intervals (unknown PO habits?) may have played a part here too.

9+ years is a good life for a turbo motor,
with the extra pressure(versus NA) behind the rings(pushing them outwards)
you could reasonably expect
to have visibly more bore wear over that length of time anyway.

Cheers, Yes, yes and yes. This will be changing though. I'll be using a side feed manifold so the core will be moving about a foot to the pass side, to retain a short path.

There is debate over weather locating the HE in the stock IC location is benaficial or not. I've never had dramas with it but this was a low power setup. I will be running a larger front mount HE in the future.

I also had my exhaust mani HPC coated to ensure minimal heat soak, although I think I'll use the stock heatshield aswell when I find someone who wants to sell one.