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<div dir="ltr" data-setdir="false">There's no real "spec" on that, much depends on the existing housing bore dimension on the other 2 mains, & how much was taken off initially.</div><div dir="ltr" data-setdir="false">If it didn't have much taken off in the initial line-boring, & center & rear housing bores are in limit, it shouldn't change the crank center too much to size the front cap & clean it up... but... if excessive it will affect all points noted, & rear seal concentricity...</div><div dir="ltr" data-setdir="false">Heck I've seen engines that were bored so much that the bearing tang groove was too small!</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Glen Efinger</div><div dir="ltr" data-setdir="false"><br></div><div><br></div>
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On Tuesday, July 28, 2026 at 06:35:12 AM EDT, tr4racing@googlemail.com <tr4racing@googlemail.com> wrote:
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<div><div dir="ltr">Hi Chuck,<br></div><div dir="ltr"><br></div><div dir="ltr">the crank is moving upwards from bore action to bore action. Means the piston deck is getting closer to the head each time and also the chain gets loosen more and more because the crank is moving towards the camshaft.<br></div><div dir="ltr">A matter of measurement how far you can go.<br></div><div dir="ltr"><br></div><div dir="ltr">Cheers<br></div><div dir="ltr">Chris<br></div><div dir="ltr"><br></div><div dir="ltr">-----Original Message-----<br></div><div dir="ltr">From: Fot <<a href="mailto:fot-bounces@autox.team.net" rel="nofollow" target="_blank">fot-bounces@autox.team.net</a>> On Behalf Of Chuck Gee<br></div><div dir="ltr">Sent: Tuesday, July 28, 2026 12:20 AM<br></div><div dir="ltr">To: Philip Gott <<a href="mailto:vfracing@aol.com" rel="nofollow" target="_blank">vfracing@aol.com</a>><br></div><div dir="ltr">Cc: Friends Of Triumph <<a href="mailto:fot@autox.team.net" rel="nofollow" target="_blank">fot@autox.team.net</a>><br></div><div dir="ltr">Subject: Re: [Fot] How many times can you line bore a block?<br></div><div dir="ltr"><br></div><div dir="ltr">I could be wrong, but I don’t think line boring affects that dimension. I understand it to be making the caps a little shorter then reboring to match the upper diameter in the block. <br></div><div dir="ltr"><br></div><div dir="ltr">Otherwise, a bunch of other dimensions would be goofed up too.<br></div><div dir="ltr"><br></div><div dir="ltr">Chuck Gee<br></div><div dir="ltr"><br></div><div dir="ltr">> On Jul 27, 2026, at 4:56 PM, Philip Gott <<a href="mailto:vfracing@aol.com" rel="nofollow" target="_blank">vfracing@aol.com</a>> wrote:<br></div><div dir="ltr">> <br></div><div dir="ltr">> Or another way to ask the question is “how much misalignment between the crankshaft and transmission input shaft can be tolerated?”<br></div><div dir="ltr">> I had a block completely gone through, including line boring and it ran very well until number one cylinder liner suddenly split. The engine hydro locked and broke the crank and front main bearing cap. I have a new cap; to use it requires the block be line bored again. I’m wondering if anyone else has a similar experience and can tell me either that it worked out well, or that I should throw the block away.<br></div><div dir="ltr">> Thanks as always!<br></div><div dir="ltr">> Phi<br></div><div dir="ltr">> <br></div><div dir="ltr">> <br></div><div dir="ltr">> <br></div><div dir="ltr">> Sent from my iPhone<br></div><div dir="ltr">> _______________________________________________<br></div><div dir="ltr">> <a href="mailto:fot@autox.team.net" rel="nofollow" target="_blank">fot@autox.team.net</a><br></div><div dir="ltr">> <br></div><div dir="ltr">> <a href="http://www.fot-racing.com" rel="nofollow" target="_blank">http://www.fot-racing.com</a><br></div><div dir="ltr">> <br></div><div dir="ltr">> Donate: <a href="http://www.team.net/donate.html" rel="nofollow" target="_blank">http://www.team.net/donate.html</a><br></div><div dir="ltr">> Archive: <a href="http://autox.team.net/archive" rel="nofollow" target="_blank">http://autox.team.net/archive</a> <a href="http://www.team.net/pipermail/fot" rel="nofollow" target="_blank">http://www.team.net/pipermail/fot</a><br></div><div dir="ltr">> Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/chasgee22@gmail.com" rel="nofollow" target="_blank">http://autox.team.net/mailman/options/fot/chasgee22@gmail.com</a><br></div><div dir="ltr">> <br></div><div dir="ltr">> <br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr"><a href="mailto:fot@autox.team.net" rel="nofollow" target="_blank">fot@autox.team.net</a><br></div><div dir="ltr"><br></div><div dir="ltr"><a href="http://www.fot-racing.com" rel="nofollow" target="_blank">http://www.fot-racing.com</a><br></div><div dir="ltr"><br></div><div dir="ltr">Donate: <a href="http://www.team.net/donate.html" rel="nofollow" target="_blank">http://www.team.net/donate.html</a><br></div><div dir="ltr">Archive: <a href="http://autox.team.net/archive" rel="nofollow" target="_blank">http://autox.team.net/archive</a> <a href="http://www.team.net/pipermail/fot" rel="nofollow" target="_blank">http://www.team.net/pipermail/fot</a><br></div><div dir="ltr">Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/tr4racing@googlemail.com" rel="nofollow" target="_blank">http://autox.team.net/mailman/options/fot/tr4racing@googlemail.com</a><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr">_______________________________________________<br></div><div dir="ltr"><a href="mailto:fot@autox.team.net" rel="nofollow" target="_blank">fot@autox.team.net</a><br></div><div dir="ltr"><br></div><div dir="ltr"><a href="http://www.fot-racing.com" rel="nofollow" target="_blank">http://www.fot-racing.com</a><br></div><div dir="ltr"><br></div><div dir="ltr">Donate: <a href="http://www.team.net/donate.html" rel="nofollow" target="_blank">http://www.team.net/donate.html</a><br></div><div dir="ltr">Archive: <a href="http://autox.team.net/archive" rel="nofollow" target="_blank">http://autox.team.net/archive</a> <a href="http://www.team.net/pipermail/fot" rel="nofollow" target="_blank">http://www.team.net/pipermail/fot</a><br></div><div dir="ltr">Unsubscribe/Manage: <a href="http://autox.team.net/mailman/options/fot/fubog1@aol.com" rel="nofollow" target="_blank">http://autox.team.net/mailman/options/fot/fubog1@aol.com</a><br></div><div dir="ltr"><br></div><div dir="ltr"><br></div></div>
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