modifying standard 12G295 head for turbo and oil pump
Turbo Mini Forums

guys,
i have this question to ask.
i'll be using this head with standard valve.someone did told me that the ex.valve guide need to be bored out a little.how much is it exactly?
also,what mod is best to do to mod my head for turbo used?is it the same as n/a head?

also this one,is it possible to use hi-capacity oil pump than turbo oil pump as it seems immposible to get it here.
thanks!

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The valve guide needs to be enlarged if you are going to use the standard Metro turbo Exhaust valve. You shouldn't. As I've told you previously, either get one of Minispares' valves, or get one form Paul Ivey.

A "turbo pump" IS a high capacity one.

if i use the standard valve?
coz it is quite hard to order from U.K..

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Don't use the standard 295 valve because it's shite.
Don't use the Metro turbo exhaust valve because it doesn't fit.

Order from Japan or Australia then, just don't use any of the above.

i see..if i use 12g940 valve to the 295 head?can it be done?
okay,lets say if i use 12g94 head?
can it just be bolt-on or the exhaust valve stiil need modifying?

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The 940 valves are way too big, and way too long. I wouldn't advocate on turning down the sodium filled exhaust valves.

940 valves are a bodge. If you want to ruin a 295 this way so be it.

If you want to do it properly, you fit 31/31 mm small bore inlets and 26.5/27 mm exhausts.

If you send a fax to Paul Ivey at Racespec, It cannot get any simpler than that.

mini monster

just to clarify, is this for a small bore motor?

as the 12g295 wont fit large bore blocks

also, the turbo oil pump will fit large bore blocks, but not small bore, well not without modifying (speak to paul_H on here) or a spacer plate.

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

joeybaby83,
yes,
it is for a small bore motor.
so the turbo oil pump wont fit eh?
so does the standard oil pump can do the job?

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so the standard 12g295 does come with that valve size right?
what about the valve guide?

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Edited by Vegard on 16th Dec, 2009.

OS valve?
u mean?
does the 31/26.5mm valve can be used for the turbo?
if i use it,with bronze guide,is it ok?

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OS=Oversize
The aftermarket valves in those sizes from Minispares CAN be used with a turbo. At least that's what I've used previously. Along with bronze guides.



Rimflo 32mm inlets. turned down A+ inlets to 27mm for exhausts.

Rimflo 32mm inlets. turned down A+ inlets to 27mm for exhausts

i dont understand...

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Vegards is saying to use the rimflo's for the inlets, and get some a+ inlet valves turned down to 27mm to use as the exhaust valves

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

so use the inlet 998cc a+ or 1275 a+?
what about the valve guide?

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Fuck 1275 valves in a 295 head.

I've used 998 A+ inlet valves as exhausts after turning them down in a lathe.

I'd still advice bronze guides in a turbo engine, especially the exhaust guides.

why do you bother Vegard?

so that mean use a+ 998 cc in valve the turned down to 27mm.
the oil pump?
standard ok?

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Tak to Paul_H about the oil pump. He does a turbo pump modified to fit a 998

I can actually hear V shouting from here

I seriously doubt it!

i've read it.
the best is PaulH pump?
i wont think it is possible as i'm on a strict budget.
but maybe later i'll use it.

for now i want to use whatever i can get on the shelf here.

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Careful, could cost you more in the long run. If it fails you need to replace/build the lot again

I seriously doubt it!

err..
guys,
1 more to ask.
the head gasket?
which type to use?

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