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Return-path: <WEmery7451@aol.com>
From: WEmery7451@aol.com
Full-name: WEmery7451
Message-ID: <b0.7173330.268aac08@aol.com>
Date: Tue, 27 Jun 2000 21:16:56 EDT
Subject: Re: Line Boring the TR-3/4 Three Main Engine Blocks
To: jaboruch@netzero.net
MIME-Version: 1.0
X-Mailer: AOL 4.0 for Windows 95 sub 10
In a message dated 6/27/00 5:40:00 PM Pacific Daylight Time,
jaboruch@netzero.net writes:
<< When I built my latest engine I had it align honed. >>
I appreciate the response, Joe. Jerry Barr seems to make a distinction
between align bore and align hone. I will try to copy and paste in his
message:
>>Subj: Align boring engine blocks
Date: 6/26/00 8:00:00 AM Pacific Daylight Time
From: jbarr@itol.com (Jerry Barr)
To: WEmery7451@aol.com
Bill,
I still think that to build a proper race engine you must start by align
boring the block and yes the bearing bore will be round, not egg shaped. The
machine that causes all the problems is the "Sunnen Align Hone". To use this
machine the machinist must first cut the caps .010", then the hone will cut
an equal amount off of the block and caps, which will move the center line of
the crankshaft up into the block about .005". That's the problem! Be sure
when talking to a machinist about align boring that he/she is referring to
boring with a single point tool, not a hone. As I said before, Align boring
will only move the centerline up about .0005" to .00075" which is well within
the tolerance set up by the manufacturer. Depending on how the seal is set
around the crankshaft, it may be necessary to recut the seal bore. By the
way, I have never had a seal leak caused by align boring the block. A problem
with the thrust bearing can occur if the caps are not set up perfectly
straight when cutting the cap parting line. This will cause the thrust cap (
if used ) to be at an angle to the block and cause reduced end thrust for the
crankshaft.
Well I have rambled on long enough. I hope this helps. My first love has
always been building engines that go fast or in the case of Diesels, last a
long time, although I have built some for modified class Diesel tractors of
the type tractor pull series that you see on TNN. Jerry<<
I received several more messages on this subject, many of which advise me
against doing aligning boring or honing, but I am saving all the messages
including yours. I think the block of my last engine which locked up on the
fourth weekend may be slightly out of line, and I may try to align it. I
change out the bearings after every four weekends. In the mean time, I am
putting together another milder engine to try to finish some races this
summer. Thanks again. Bill Emery
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