Can someone please explain to me what this is? I assume its used to boost a bit more. Thats about all i know. Just lookng for some information on this.

Thanks
Chase

 

It keeps the cylinders from changing shape during boost-- It stabilizes the cylinders.

 

You have it pressed into the water jacket and sometimes welded in place. It is used mostly for boosted motors. It gives support to the sleaves so you don't blow your motor.

 

Check it out. This is a motor:



The deck is the flat surface at the top of the block that mates to the head. The cylinder sleeves are what the pistons move up and down in. In this motor (B18C) there is a water jacket, which is the space you see between the sleeves and the rest of the block. A motor that looks like this on the inside is called "open deck."

This is another B-series motor, but this time with a block guard installed:



Note that the block guard fills up the water jacket to reinforce the sleeves. If a motor has no water jacket to start with, it's called "closed deck."

 

does the block guard inhibit the water flow much? i would think that w/ all the restriction it would run your engine a bit warmer. i've seen a few companies making them, any that u can suggest?

 

Yes, that's the primary argument against them. As to their actual effects, that's a point of quite a bit of argument.

 

Just to clear things up, the block guard doesn't completely eliminate the water jacket. It's like a cap that goes over it. Flow of coolant into and out of the jacket is restricted a little bit but I wouldn't be worried too much about overheating as long as there are still some coolant passages.

My thoughts on the matter are that if you're making enough power to create a need to reinforce your block, you've got enough money that you might as well have new sleeves installed.

 

so what would be the best way to get the water cooled back down after it spends extra time in the water jacket because of the restriction? just a better radiator from fluidyne?

 

The stock radiator's pretty good actually. If you took a stock motor and just added a block guard I wouldn't be concerned about cooling. If you run a bunch of boost and you have a block guard then maybe you need a Fluidyne.