What's the difference between an open deck vs a closed deck block? Or a semi-closed deck?
02-17-2001, 10:58 AM
#2
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Re: What's the difference between an open deck vs a closed deck block? Or a semi-closed deck?
Closed deck blocks have open spaces between the cylinders and the edge of the block that comprises the mating surface between the block and the cylinder head. It requires sand casting and is more difficult and expensive. Sand casting is also less precise than die casting. The plus side of closed deck blocks is that they're stronger than open deck designs. I think all of the current Honda blocks are open deck and they seem to hold up fine after forced induction so I don't think it's really an issue until big hp is involved.
Closed Deck:
<img src="http://pictureposter.audiworld.com/776/closed_deck.jpg">
Open Deck:
<img src="http://pictureposter.audiworld.com/776/open_deck.jpg">
Closed Deck:
<img src="http://pictureposter.audiworld.com/776/closed_deck.jpg">
Open Deck:
<img src="http://pictureposter.audiworld.com/776/open_deck.jpg">
02-20-2001, 10:07 AM
#7
Right, because their alloy block cannot take the all the force, so that have about 1/4" thick metal
liner. And these stock ones will crack with any forced induction above 6-8 psi, so they are replaced with slightly thicker and reinforced ones, and welded around the top to make them a closed block kinda design. Cost - About $300 for this one shop in L.A. (if you send them a block only) At least that what is needed to extract above 300hp from these 1.8L engines.
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CarTTman
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10-23-2001 12:13 PM
alloy, block, blocks, closed, deck, difference, diffrence, england, fully, h22, open, reinforced, semi, semiclosed, whats
