i recently bought a b18a1 and tore it apart as soon as i got it to the shop. the next day i was bored and broke so i decided i would go to work and make a block guard for it. i got the block to work and started measuring the od of the cylinders and relized they were all different. they were all only within about .075 . this leads me to believe that the ones that you buy are pretty much worthless since you can flip them anyway you want to and they still fit in ( or at least the one i bought from race enginnering for my d16 would). so in reality only one cylinder would be supported. so in my opinion the only for a block guard to work properly you would have to machine the entire collant passage (1.000 deep or how ever thick you want your block guard to be) and make a block guard to press in the gap. anyone agree or is this something that everybody already knows?

 

They are normally designed to be a tight fit, and some are intended to be welded in.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Padawan &raquo;</TD></TR><TR><TD CLASS="quote">They are normally designed to be a tight fit, and some are intended to be welded in. </TD></TR></TABLE>


thier designed to be a tight fit but if the od of the cylinders are all different and you can flip it and it fit in then wouldnt that mean that the id's of the block guard are all the same? which would mean your only supporting the cylinder with the biggest od and the others could move around up to .075 (in my case).

 

Most require a good deal of force to install, and by design should allow some pressure to be put on all of the sleeves even if there are slight variations in the diameters.

Because of the tightness and the force required to install the guard, the cylinders should all be checked to ensure roundness after the installation.

 

.075 is alot more than a "slight" variation.

 

We use the race engineering block guards too. You either install pins on the outside of the guard to keep it from moving and Help keep the pressure on the walls, or weld it in and deck it afterwards. There is also a writeup somewhere where a guy used rockite to make a permanent block guard. Good writeup. I'll see if I can find it. Personally I'd do a flanged sleeve kit (Darton, AEBS, etc).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BILLETGRIP &raquo;</TD></TR><TR><TD CLASS="quote">.075 is alot more than a "slight" variation.</TD></TR></TABLE>

It depends on you definition, but nevertheless, that's how they're designed.