Hey guys haven't posted here in forever. I've moved on to greater things http://www.my350z.com

Anyways, I was wondering if the VQ35DE is open-deck or closed and what is the differance?

Thanks,
Victor

 

bumpity bump

 

Thanks to google... http://www.google.ca/search?hl=en&ie...22+block&meta=

http://www.corollaperformance.com/TechInfo/1ZZFE.html

(and there are tons more hits

 

Modern aluminum block engines use steel cylinder sleeves inside to let the pistons ride in. Aluminum is just to soft and would quickly wear away under the abuse of piston rings. Open-deck blocks have a space between the sleeves and the block at the top of the engine block. Closed-deck blocks have some reinforcement between the sleeves and block at the top of the engine block. In high-HP applications like forced induction, etc that can create much larger pressures inside the combustion chamber and more violent combustions, an open-deck block is weaker because it cannot tolerate as much pressure. The head gaskets (between the cylinder head and block, right at the open/closed-deck interface) tend to fail due to the movement between the cylinder and block, and the pressure blows out the side. Closed-deck blocks, being more rigid at that point, can hold in the pressure better and are more resistant to blowing out head gaskets.

I believe the 3.5L in the 350Z is just like the Maxima 3.5L block, and is an open-deck design. Should not really be a problem until beyond 400 HP. I believe Nissan tested the VQ and determined that the block fails around ~450 HP. You should be able to add significant power to the 350Z before the open-block design becomes any sort of limitation.

 

hmmm. Wonder if the VQ3DETT is open deck or closed?

 

"Modern aluminum block engines use steel cylinder sleeves inside to let the pistons ride in. Aluminum is just to soft and would quickly wear away under the abuse of piston rings. Open-deck blocks have a space between the sleeves and the block at the top of the engine block. Closed-deck blocks have some reinforcement between the sleeves and block at the top of the engine block. In high-HP applications like forced induction, etc that can create much larger pressures inside the combustion chamber and more violent combustions, an open-deck block is weaker because it cannot tolerate as much pressure. The head gaskets (between the cylinder head and block, right at the open/closed-deck interface) tend to fail due to the movement between the cylinder and block, and the pressure blows out the side. Closed-deck blocks, being more rigid at that point, can hold in the pressure better and are more resistant to blowing out head gaskets."

I'd like to get detailed information on the proses of making a closed deck block into a closed deck block, do you know where I can find information on this? Any information my help

Thanks,

John

 

Sorry, I mean an "open-deack to a closed-deck"

 

What type of weld do they use? They have to weld steel with aluminum, right?