ok heres the deal i just started to build my first motor in my engine building class at my school. its a 1st gen b16a and im going all motor. my cylinder bores are out of round so i have to go .20 over and my shop teacher is saying that i have to run a block guard to bore and hone my sleeves or any open sleeve motor reguardless if its na or fi. i have never heard that people have to use a block guard to bore and hone. and my questioon is are there people out there that have succesfully bored and honed there motors without a block guard. tell me some opinions.

 

bump

 

there has to be someone out there that has bored and honed a b-series engine. if you have did you or did you not use a block guard?

 

No u do not need a block guard..Theres plenty of ppl not using a block guard..like me for instance..Im bored .20 over on a b18c and no block guard...Whoever had the motor before me put a block guard in and i had some overheating issues with it in so i removed it before assembly.

 

it is not necessary that you use a block guard to perform the job. the way I see it is you either sleeve it or leave it.

 

so u guys bored yours with the block guard out?

 

Sounds like some straight up B.S. to me. Does your shop teacher have any experience with open deck motors?

 

Your shop teacher needs to go back to school. I have run as big as an 86.5mm bore with no block guard. No sealing issues either-my machinist is Dan Benson and his work is second to none.

 

your shop teacher is correct, if using a blockguard, you need to install it first then bore and hone since it can shift the sleeve slightly

 

how do you know. were did you learn that you need to use the block guard when machining your cylinder walls? thanks

 

hold on i understand that IF i want to use a block guard i need to bore and hone after i put the block guard in. BUT i dont want to use a block guard. my teacher is telling me that IF i want to machine the block i need use the block guard. its the other way around.

please does anyone have any info on block guards?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by djphonics &raquo;</TD></TR><TR><TD CLASS="quote">Sounds like some straight up B.S. to me. Does your shop teacher have any experience with open deck motors?</TD></TR></TABLE>

yes he says that he has put honda blocks on his boring machine and it distorted the cylinder walls. but i have heard from a lot of guys that have gone .20 over and they havent used a block guard.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe &raquo;</TD></TR><TR><TD CLASS="quote">Your shop teacher needs to go back to school. I have run as big as an 86.5mm bore with no block guard. No sealing issues either-my machinist is Dan Benson and his work is second to none.</TD></TR></TABLE>

but i dont think you ran stock sleeve 86.5 mm bore. there would be no cylinder wall left if it was stock sleeves

 

Motor was sleeved-the point was that you can run a very large bore without the need for a block guard.

 

thats not my question. my question is, if you want to machine stock sleeves do you have to use a block guard?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by benmyfriend &raquo;</TD></TR><TR><TD CLASS="quote"> if you want to machine stock sleeves do you have to use a block guard?</TD></TR></TABLE>
No.

 

no is the answer however if you are going to use a block guard make sure that it is installed when the boring is done ..... again NO you absolutely do not need a block guard.

 

im sorry for beating this thread to death but does anyone know why my teacher is distorting sleaves when he doesnt use a block guard? or is there some type of trick to machining honda blocks? thanks

 

You alternate bores, 1=4=2=3 do it in 2 cuts, use lots of cutting oil, and hone it in 3 steps using the same 1-4-2-3 steps. It ain't a Chebby. Temperature matters.
Now if he is talking honing plate, I have one I will sell you. They are expensive.

 

what is a honing plate? great answers by the way

 

A honing plate is bolted to the top of the block during the bore/hone process. It simulates the bore distortion caused by torquing a cylinder head down.