Block Cylinder Chamfer
Racer
Joined: Apr 2016
Posts: 493
Likes: 65
Burning Brakes
Joined: Feb 2005
Posts: 894
Likes: 91
There isn't a definitive answer to that question, and there is no "right-or-wrong" either.
We do this for a living and we go over this specific issue with EVERY single customer on EVERY single build! It really becomes a customer decision AFTER it's discussed! We do give them the "pros/cons".
Thanks, Gary in N.Y.
P.S. There are many instances where much of the original "chamfer" will remain after boring/honing?? Even the amount of decking comes into play here. I prefer no real "chamfer" but this is my opinion, we do "break" any sharp corner at the top regardless. We use a small "jewelers" file or a very fine "cartridge" in a dremel to break the edge if it's fairly sharp.
We do this for a living and we go over this specific issue with EVERY single customer on EVERY single build! It really becomes a customer decision AFTER it's discussed! We do give them the "pros/cons".
Thanks, Gary in N.Y.
P.S. There are many instances where much of the original "chamfer" will remain after boring/honing?? Even the amount of decking comes into play here. I prefer no real "chamfer" but this is my opinion, we do "break" any sharp corner at the top regardless. We use a small "jewelers" file or a very fine "cartridge" in a dremel to break the edge if it's fairly sharp.
Drifting
Joined: Aug 2004
Posts: 1,883
Likes: 124
From: Lubbock TX
My machinist used a big cone-shaped chingadera that he chucked up on a drill. A second or two on the top of each bore broke that top edge nicely. And as bashcraft said, make sure they break the edge or chamfer at the bottom of the bores, too - helps keep the pistons from scuffing so bad.
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Dr. Detroit
Joined: Mar 2012
Posts: 10,095
Likes: 4,026
From: New Braunfels Texas
I thought it was an accepted practice to do so on the top and bottom.......our shop did it without a thought......especially at the bottom when stroke clearance.
The reason you do it at the top is so when you use a tapered ring installer "halo"....the reveal at the bottom of the tool has somewhere to locate and center itself.
It is also a sharp edge for to ask for detonation.
Jebby
The reason you do it at the top is so when you use a tapered ring installer "halo"....the reveal at the bottom of the tool has somewhere to locate and center itself.
It is also a sharp edge for to ask for detonation.
Jebby
Last edited by Jebbysan; Feb 8, 2017 at 10:35 AM.
Thread Starter
Drifting
Joined: Oct 2012
Posts: 1,524
Likes: 61
From: Medina Ohio
Yeah I understand the reasons why. Just first block I've done from scratch. So when I got it home and unwrapped it, I noticed the lack of chamfer. Wanted to double check if it was a standard process before I called and sounded stupid. I did call yesterday and front desk lady said to just bring it back and the owner will take a look. ...I'll check the bottom too. Thanks.
Le Mans Master
Joined: Jan 2006
Posts: 6,504
Likes: 139
From: Butler Pa
Yeah I understand the reasons why. Just first block I've done from scratch. So when I got it home and unwrapped it, I noticed the lack of chamfer. Wanted to double check if it was a standard process before I called and sounded stupid. I did call yesterday and front desk lady said to just bring it back and the owner will take a look. ...I'll check the bottom too. Thanks.
The bottom can be done with some emery cloth.
Le Mans Master
Joined: Jan 2006
Posts: 6,504
Likes: 139
From: Butler Pa
Drifting
Joined: Aug 2004
Posts: 1,883
Likes: 124
From: Lubbock TX
I wash mine, too.
I still say take it back because 1) the machine shop owes it to you - no block is ready for a build until the top chamfer is in place, and 2) if anything gets damaged during the process, it's on the builder, not the owner.
Maybe I'm just spoiled, my machinist won't let anything out of his shop until it's completely ready to build and has instructed me in no uncertain terms to bring anything back that needs any more work at all.
I still say take it back because 1) the machine shop owes it to you - no block is ready for a build until the top chamfer is in place, and 2) if anything gets damaged during the process, it's on the builder, not the owner.
Maybe I'm just spoiled, my machinist won't let anything out of his shop until it's completely ready to build and has instructed me in no uncertain terms to bring anything back that needs any more work at all.
Thread Starter
Drifting
Joined: Oct 2012
Posts: 1,524
Likes: 61
From: Medina Ohio
I guess I should add, the block was pretty fresh when I dropped it off to him, so he only ended up having to hone to the new pistons and do a line hone. So when I took it back he said because they didn't bore or deck the block they didn't do a chamfer. He looked at it and said he'll take car of it. ..There was some remaining chamfer, but it was pretty minimal.