block guard or pinning
 

i'm building a d16z6 for boost, should i get a block guard and have machine shop tig weld it, or should i pin the bitch. i'm going for 12-14psi ,i've got wiseco pistons 8.5:1, crower billet rods.

Re:block guard or pinning
 

What size turbo are you going to be using? I am anti-blockguard because of the nasty ---- that happened to me. I don't suggest them to anyone. Pinning I have no experience with, but I have seen people use them with good results.

To be honest with you, at only 12-14 psi I wouldn't be worried about the sleeves unless you are running a big turbo. You already have the most important parts(pistons, rods).
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Re:block guard or pinning
 

Dr.Boost... what happened to you with a blockguard?

Re:block guard or pinning
 

Massive, uncontrolable overheating which lead me to warp the cylinders causing a not so friendly seal between the block and the head. :)

Now, in the blockguards defense, it was not installed the correct way. It was not welded in and no machining was done to the cylinders afterwards.

I still would never use one. If you think about it, if your cylinder walls are pushed to the point of breaking, is this blockguard going to stop ---- from happening, and even if it did, would you be comfortable knowing the only thing saving your cylinders from snapping in half is a cheap piece of aluminum. :-\

I think the cylinder walls are very strong without any aid. Unless you are pushing 350hp, I don't see the need for it. I'll be doing some tests with a few Z6 blocks soon so I will have some proof to back this up.
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Re:block guard or pinning
 

You need somekind of support at 15+ psi.
pinning is cheaper and better go with it.
A blockguard you would need to put more money in and then drill some more holes in the blockguard etc.
I would post pin the block

Re:block guard or pinning
 

99% of the blown motors I have seen had piston or rod damage, not cylinder wall damage. The cylinder wall might have been damaged from the piston or ring giving out, but it wasn't the cause of the failure.
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Re:block guard or pinning
 

were those with aftermarket forged pistons and rods?

Re:block guard or pinning
 

If my d-series decides to take a poop on me and I end up building it I will proly go with pinning/posting the block.

Re:block guard or pinning
 

so true. if you got stock rods and pistons, they probably will go first.

Re:block guard or pinning
 

I havent used either but you can obviously see the overheating issure with the block gaurd. As fas as pinning the block, I dont know forst hand but here it goes....

Im an senior in mechanical and civil engineering and we have done computer simulations of stress caused by putting a point load on a beam with a bending load applied to it and the stress casued is like 5x that of the stress from bending...Translation....the sleaves break because of the side load from the pistons, they basically have to keep the pistions going straight up and down (That takes a force). The piston can be veiwed like a beam no with a side load on it. When you support it with a point (block pin) all that side force is now transfered over the very small area where the pin touches the sleeve====high stress===brocken sleaves. My guess if the sleeve breaks its right at the pin.

All this is fine and good but bottom line i would skip the pinning and save for sleeves if you were gonna go all out with pisyons and rods if you are gonna need sleeve support.

Sorry, deep down im a nerd