This is probably a stupid question but im just trying to learn more about certain stuff I dont know.

Whats the difference between a open and a closed deck ?


--- And whats the advantage of one over the other, vice a versa for disadvantage?

 

I would like to know too...

I just know closed deck is better for the boosted guys.

 

Closed Deck
Closed deck is basicly a non-floating sleeve. The block is solid as u can see from the picture below..


Open Deck
Open deck is the opposite of the closed, It has a full floating sleeve, Open deck sleeved blocks can hold a nice amount of power, But if u intend on making some series power and u got the money to just blow go ahead and get a Dart closed deck block. Just remember, there banned from NHRA events if i remember correctly.. I have seen some stock sleeved blocks hold 350+whp with no problem, its all in your tune. If your gonna exceed what u think stock sleeves will not hold i would save yourself some money and Do a sleeve job from Vince at GE.... This is a GE block pictured below..


A closed deck is not only used with turbo applications. Can be used in all applications if need be. But the cost doesnt sell me to buy one (dart block) when i could have a GE block for much less and have a lifetime warrenty if anything was to happen due to problem with the block and not owner/engine builder or tuner.

 

Does a closed deck still retain its siamese walls then?

 

I have a question about the closed deck, how does it get coolant to run through it?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JojoBananas &raquo;</TD></TR><TR><TD CLASS="quote">I have a question about the closed deck, how does it get coolant to run through it?</TD></TR></TABLE>

There's passages in the block for coolant.

 

Coolant is run through the block. The only disadvantage of a closed deck is that coolant cannot get to the very top of the cylinder wall. Therefore the top of the sleeve may not be at the same temp as the rest of the sleeve.

 

which block guard is that?? also, i have a questions (sorry to threadjack... but it goes along with this thread)

could you run 2 of those block guards? like shove one down to the middle of the sleeve, and then one more at the top like normally??? has anyone ever done anything like that?

 

[QUOTE=SeanJohn1802
which block guard is that?? also, i have a questions (sorry to threadjack... but it goes along with this thread)

could you run 2 of those block guards? like shove one down to the middle of the sleeve, and then one more at the top like normally??? has anyone ever done anything like that?[/QUOTE]

That is not a blockguard, that is part of the sleeve design.

 

dont they make a block guard that look like that? i think maybe it was endyn? but to my questions, would that idea work with block guard?

 

If the pictures don't say it all...Then let's put it like this...
On an open deck, (stock honda design) there is a space around every cylinder, this definitly allows excellent cooling capabilities...BUT under extreme stress, which most of us can't afford to buy and bolt on (turbo,superchargers,etc) a closed deck offers more support as there is no cylinder flex. Under enough stress, a stock block with no reinforcement can flex enough to blow a head gasket. So the powers that be, made a blockgaurd which basically braces off the top of the cylinders where they are definitly the weakest. These also have a grooved design so plenty of coolent can get by, and they are made of aluminum so they can expand and contract with the block...I put one on my B17 when I rebuilt it and had it tack-welded into place flush with the top...For about only a hundred bucks it's a damn good bit of extra security, especially if you're building your motor!

 

A block guard is nice security, but if you plan to run alot of boost, I suggest sleeving it.

 

and you greatly reduce risk of getting that nasty milkshake with a closed deck

 

Wow I like that first pic, where did you get it? Wait that's where I'm eating breakfast right now, in my kitchen.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tbone &raquo;</TD></TR><TR><TD CLASS="quote">Wow I like that first pic, where did you get it? Wait that's where I'm eating breakfast right now, in my kitchen.</TD></TR></TABLE>

How is things going with your motor by the way?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 99ITR#3715 &raquo;</TD></TR><TR><TD CLASS="quote">

How is things going with your motor by the way?</TD></TR></TABLE>

Head needed new guides because when they were installed them last time they hand sanded them and hammered them in. We just found this out when Jim Justice went to do the new valve job. So Curtis boggs is reblending the new seats and it should be ready in a week or two.
Thanks for asking


Modified by Tbone at 4:37 PM 2/20/2004

 

Have been following your build thread, only wish I had money to do a build like that

 

Me too