open block vs closed
05 June 2002, 02:14 AM
#1
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I noticed there has been mention on here before
is there a thread that discusses the differences??
Is the closed deck really that much better or is it a little hype
regards in advance
is there a thread that discusses the differences??
Is the closed deck really that much better or is it a little hype
regards in advance
05 June 2002, 04:21 AM
#2
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For high boost pressures the closed deck block is best as there is more metal holding the cylinder blocks in place. I have heard of open deck blocks collapsing in on each other, plus you are more likely to blow head gaskets with the open deck blocks. I have some stuff on my site about this
http://www.geocities.com/subman2001nz/
http://www.geocities.com/subman2001nz/
05 June 2002, 05:06 PM
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Location: Leeds - It was 562.4bhp@28psi on Optimax, How much closer to 600 with race fuel and a bigger turbo?
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I presume you have rebored and had new pistons fitted?
How far down did you weld??
David
How far down did you weld??
David
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05 June 2002, 05:36 PM
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katana, unless you have seen it, its no guarantee!
what exactly do you mean by first generation wrx? if you mean of the same era as the first sti, then you are more likely to, but not guaranteed.
Only model which has one in all known reported cases and all advertising literature is the 22B.
what exactly do you mean by first generation wrx? if you mean of the same era as the first sti, then you are more likely to, but not guaranteed.
Only model which has one in all known reported cases and all advertising literature is the 22B.
05 June 2002, 05:46 PM
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My car has now 315 hp and 420 Nm
it is a uk my98 whit a DTA ecu and a vf23 turbo and a front mounted intercooler.
I am now looking for pistons and rods for my new project
I want now 370 hp.
Is it posible to put 22b pistons in it
And the crank can it hold 370 hp
it is a uk my98 whit a DTA ecu and a vf23 turbo and a front mounted intercooler.
I am now looking for pistons and rods for my new project
I want now 370 hp.
Is it posible to put 22b pistons in it
And the crank can it hold 370 hp
06 June 2002, 01:28 AM
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If you're getting the blocks closed, apart from stress issues from heating up small sections of the block only, you need to compare the holes in the head gasket, to those in the block, and it would be worth die grinding the holes back to match.
FYI, Cobb Tuning in the US, heat the whole block up in an oven, before the welding work ia carried out. It is then left to cool, and then re-heated for stress relief.
Christian, it looks like the pic's you posted are of a reworked block to. Seem to be a few about these days
Mark.
FYI, Cobb Tuning in the US, heat the whole block up in an oven, before the welding work ia carried out. It is then left to cool, and then re-heated for stress relief.
Christian, it looks like the pic's you posted are of a reworked block to. Seem to be a few about these days
Mark.
06 June 2002, 01:07 PM
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tony,
the sti 3 is by no means guaranteed to have a closed deck block.
ask moray if his sti 3 is closed!
all stis had the option of a closed deck block, the only one that came with it as standard and therefore will always have and has always so far of those that have been opened as I said is the 22B.
Katana,
I had been told that with that age of car, you are likely to have one.
no guarantee, but more likely than not! 
the sti 3 is by no means guaranteed to have a closed deck block.
ask moray if his sti 3 is closed!
all stis had the option of a closed deck block, the only one that came with it as standard and therefore will always have and has always so far of those that have been opened as I said is the 22B.
Katana,
I had been told that with that age of car, you are likely to have one.
no guarantee, but more likely than not!
06 June 2002, 04:56 PM
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I had been told that with that age of car, you are likely to have one. no guarantee, but more likely than not!
I'm sooooo going to be friendly with the breakers ain't I.
06 June 2002, 05:55 PM
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Location: Leeds - It was 562.4bhp@28psi on Optimax, How much closer to 600 with race fuel and a bigger turbo?
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I think Mark has just p1ssed on my bonfire about making my own.... Who knows... I might see if I can get my hands on a knackered block and get it welded up and then machine it for some different pistons
My budget modding has gone out of the window
David
My budget modding has gone out of the window
David
06 June 2002, 08:25 PM
#20
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Location: Leeds - It was 562.4bhp@28psi on Optimax, How much closer to 600 with race fuel and a bigger turbo?
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Are the studs not high tensile allready?
What does wire ringing involve, as I have never seen it done or explained???
David
What does wire ringing involve, as I have never seen it done or explained???
David
07 June 2002, 09:40 AM
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I used to run around 20PSI of boost in my old UK94. I had the head gaskets changed for "Group A" ones I think. They were certainly VERY expensive and were complelely metal if I remember correctly.
Apart from blowing a piston when it was used in competition on *REALLY** high boost I had no problems with the open deck block. Ran with Cosworth pistons as a replacement and they were fantastic apart from the oil usage increased as they have VERY short skirts ..oooh eerrr misses.....
Apart from blowing a piston when it was used in competition on *REALLY** high boost I had no problems with the open deck block. Ran with Cosworth pistons as a replacement and they were fantastic apart from the oil usage increased as they have VERY short skirts ..oooh eerrr misses.....
06 July 2002, 01:26 AM
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Trout you are right, the head bolts are not strong enough for ultra high boost levels.
You can also drill out the spigots holes and replace with longer spigots, stops the head moving on the block.
Wire ringing stops you blowing head gaskets. If you look at a head gasket the have metal rings around the material, well what they do it slot the head so these fit into the slot and make a cooper ring to also fit in this gap. This stop the gakset from moving.
[Edited by submannz - 6/7/2002 1:28:22 AM]
You can also drill out the spigots holes and replace with longer spigots, stops the head moving on the block.
Wire ringing stops you blowing head gaskets. If you look at a head gasket the have metal rings around the material, well what they do it slot the head so these fit into the slot and make a cooper ring to also fit in this gap. This stop the gakset from moving.
[Edited by submannz - 6/7/2002 1:28:22 AM]
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