Does anyone here know what does it mean by close deck and open deck? how does it affect the performance?
close deck / open deck
- Thread starter normality78
- Start date
open deck / close deck on what??... engine???.... something like DVVT or VVTi??... variable valve control??...
- Nov 16, 2005
- 964
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- 1,518
open deck & close deck.. are u reffering to VTEC? SUBARU? ETC ETC?
* im using H22A Dohc VTEC. so my engine is = CLOSE DECK
*closed deck allows for sleeve support...essentially making a stronger bottom end.
* close deck is more reliable.
Open deck means that there is a water jacket between the cylinder walls and the block. Pros are better cooling. Cons are weaker cylinder walls.
Closed deck means it's solid between the block and the sleeves. Pros and cons are the opposite of open deck
CLOSE DECK
OPEN DECK
* as i know. if OPEN DECK = its you might can or cannot change the "SLEEVES" (might be hard,coz the rounding is bigger)
* as i know. if CLOSE DECK = its easy to change the "SLEEVES" (you can put forged pistons,bigger pistons sizes n rings,change to strong "SLEEVES".
just check the pics.. hope u get what i mean.
Please see below pic. this is Subaru EJ25. (this one not change SLEEVE,but filling in the blocks with billet aluminum using a special zero tolerance fit.)
before:
after filling:
1) There is nothing about a closed-deck block that would cause cooling problems. Honda uses an open-deck design for production/casting reasons, not just engineering reasons. It saves time and money during manufacturing.
2) Closed-deck blocks are also SIGNIFICANTLY more rigid than open-deck blocks.
3) If someone has had cooling problems with a block guard, I feel strongly that it was due to a poorly designed or poorly installed block guard, rather than any fundamental flaw in the closed-deck design.
* im using H22A Dohc VTEC. so my engine is = CLOSE DECK
*closed deck allows for sleeve support...essentially making a stronger bottom end.
* close deck is more reliable.
Open deck means that there is a water jacket between the cylinder walls and the block. Pros are better cooling. Cons are weaker cylinder walls.
Closed deck means it's solid between the block and the sleeves. Pros and cons are the opposite of open deck
CLOSE DECK
OPEN DECK
* as i know. if OPEN DECK = its you might can or cannot change the "SLEEVES" (might be hard,coz the rounding is bigger)
* as i know. if CLOSE DECK = its easy to change the "SLEEVES" (you can put forged pistons,bigger pistons sizes n rings,change to strong "SLEEVES".
just check the pics.. hope u get what i mean.
Please see below pic. this is Subaru EJ25. (this one not change SLEEVE,but filling in the blocks with billet aluminum using a special zero tolerance fit.)
before:
after filling:
1) There is nothing about a closed-deck block that would cause cooling problems. Honda uses an open-deck design for production/casting reasons, not just engineering reasons. It saves time and money during manufacturing.
2) Closed-deck blocks are also SIGNIFICANTLY more rigid than open-deck blocks.
3) If someone has had cooling problems with a block guard, I feel strongly that it was due to a poorly designed or poorly installed block guard, rather than any fundamental flaw in the closed-deck design.
Last edited:
how to transform from open deck to close deck??... fill it up with metal??.... will make the engine block heavier??...
as for BOT on such engine, close deck has a better advantage??..
as for BOT on such engine, close deck has a better advantage??..
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