ive heard a ton of different explanations of what an open deck block is vs a closed deck block...still unsure.
so....lets hear it from the tech gurus!
Resurrected from the dead
open deck/closed deck
ive heard a ton of different explanations of what an open deck block is vs a closed deck block...still unsure.
so....lets hear it from the tech gurus!
Beyond Alcoholic
closed/open deck refers to the way the cylinder sleeves are designed.
dirty sohc's stock open deck d16
b16 with darton closed deck sleeves
see the difference?
Mr. Beyond
basically the cylinder heads are floating in a open deck design, and they are not in a closed deck design.
Registered User
whats the advantage?
just more rigidty for high hp/torque apps er what?
Registered User
My h22a1 closed deck
add .orig.jpg
on the end of the img if you want to see a larger picture....
the red outlining basically is trying to show you the wear against the bottom of the head, by the cyclinder head, due to the extra slop cause of no rod bearing.
Mr. Beyond
If you are pushing alot of boost you'll need thicker heavier sleeves put in that can take the increased pressure of the extra power. Closed deck is better for FI just for the fact that you dont have to worry about the cylinders shifting under pressure. If you want to stick with the open deck design then you might want to reinforce those cylinder walls somehow, like the B16's use the NuFormz block guard. But resleeving is the best option.Originally posted by DUBBED
whats the advantage?
just more rigidty for high hp/torque apps er what?
0.2 liters away from a good engine
Actually I have an STR block guard in there now.=)Originally posted by 2000impreza
closed/open deck refers to the way the cylinder sleeves are designed.
dirty sohc's stock open deck d16
Registered User
from the pics post in this thread that is not block guard but dartan race sleeves.Originally posted by buh_buh
, like the B16's use the NuFormz block guard. But resleeving is the best option.
Registered User
IMO block guard is just plain ass and for low boost you do not need it and for high boost you need sleeves.
Registered User
redline that pictures states that it is darton sleeves.
Mr. Beyond
I know, I was just using a block guard as an example. I would not use a block guard.Originally posted by redline
from the pics post in this thread that is not block guard but dartan race sleeves.
Resurrected from the dead
and open deck is easier to cool i assume?
Guest
It doesn't make a difference (assuming there are proper amounts of coolant passages on a closed deck block).Originally posted by GTS Jeff
and open deck is easier to cool i assume?
Originally posted by SEANBANERJEE
I have gone above and beyond what I should rightfully have to do to protect my good name
Master Engine Builder
Open deck lets you use a permanent (reusable) mold. This also allows the molten metal to be pressurized for higher density. The casting is more accurate (less machining) and can be automated.
Closed deck is done with casting sand which has to be cleaned out partlly by hand (expensive). The real reason for core (frost) plugs....not freeze protection.
Registered User
so how are the sleeves held in place on an open deck design?
this is what my block looks like, closed deck i take it? Yes, closed.
Last edited by hjr; 01-06-2004 at 04:50 PM.
Registered User
Great explanation Alpine!
Hjr they are attached lower down inside the block. IMO both designs have their pros and cons. I would think open deck designs would equalize sleeve temps slightly better than a closed deck, as the water jacket goes the length of the sleeve. Where as closed deck have a solid plate near the top, thus less surface area in contact with coolant to dissapate the heat. Anyone know what would design would allow more warpage?
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