dr_jones

iTrader: (1)

Can anyone definitively answer whether a V3 (Jan 97) Sti V-ltd would have an open or a closed deck block fitted as std?

Cheers,

dr_jones

Peanuts

iTrader: (15)

my guess is open

jonny gav

iTrader: (1)

yep, open

911

My Sti v3 facelift is open
Graham

dr_jones

iTrader: (1)

Cheers chaps - I'll check this evening (apparently crosshatching above the oil filter on the casting is the tell tale...)

Next question in - and I know there is not a definative absoute answer - but what are the reasonable max boost / power / torque levels for the open deck blocked in comparison to a closed deck?

john banks

The pistons and rods, or the driveability/power band if a road car (because you'll need a big turbo) will probably be the limiting factors on a 2.0 before the fact it is open deck is relevant.

dr_jones

iTrader: (1)

Thanks John - Its a road car but I'm "going" to be using it for some sprint events also - Sounds like I really needn't stress too much about it.

On the id'ing front - just stuck my head under the car tooking for the cross hatching (or more probably lack of it) above the oil filter and can;t tell either way there appears to be a sleeve above the filter that is obstructing things (above what I take to be a water cooling module?) is this normal???

harvey

iTrader: (48)

I think that the need for a closed deck block for big power may have been another one of the Scooby myths. The open deck blocks handle power well over 500bhp as far as I know without failure atributable to the block itself.
For a daily driver it may be preferable to have an open deck or semi open deck. My thoughts behind this are the temperature gradients that will exist in a CDB with continual heating and cooling and therefore on a CDB, gentle warm up and cooling and the avoidance of thermal shock is very important.

dr_jones

iTrader: (1)

Hmm yeah see you point - i was under the impression that the open generally had a higher incident of gasket failure thant the CDB - mind I've no actual numbers on this....

funkyspider

and just in case other ppl didnt know the difference between open and closed deck blocks

http://www.cgperformance.com/subaru_block.htm

dutchScoobydriver

yeah but its not factory build but a conversion to a closed deck

APIDavid

iTrader: (4)

" Generally speaking if your run over 10lbs of boost you need a closed deck block to be reliable. "

So says CG Performance - What a load of tosh !!

David APi Engines / APi Impreza
www.apiengines.com

Adam M

you can guess what you like about the above, but you have to ask yourself why all the wrc engines start off with CDBs.

APIDavid

iTrader: (4)

Yeah, but look at the energy they absorb and the sheer hard work that they have to put up with. At one time they were trying a huge compression ratio and super high boost too!!

It's just the point that 10 psi is their chosen pressure, which is extremely low by most standards.

David APi