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post #1 of 8 (permalink) Old 05-15-2014, 01:31 AM Thread Starter
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Barrels not bored straight???

Just had my motor built 500 miles ago and started hearing what I thought was a collapsed lifter, took it back to the shop who built it and the pulled the heads and jugs. Then they found scored pistons front and rear! Was told when the cylinders were bored off center?? Never heard of that. 88" bore to a 95" now a107"


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post #2 of 8 (permalink) Old 05-15-2014, 02:09 AM
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post #3 of 8 (permalink) Old 05-15-2014, 02:16 AM
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So, the shop that built your engine didn't bore the jugs? If not they both screwed up. Why didn't the engine builder find the error? They should pay for all parts needed to do the job correct this time & any other out of pocket money you've spent. Good luck.


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post #4 of 8 (permalink) Old 05-15-2014, 04:27 AM
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post #5 of 8 (permalink) Old 05-15-2014, 06:25 AM
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When we bore here(almost every day)we mount the base of the cylinder in a precision fixture we manufacted almost 15 years ago,(having being a papered NYS Toolmaker from years ago) then once lightly held in place, indicate the bore to run true within .001", using a Starrett Last Word universal test indicator, then we tighten the fixture securing the cylinder to insure that the cylinder base, and bore, are 100% perpendicular.
Never a chance of those being any less than spot-on.
This is the same exacting procedure we adhere to when boring all our cylinders here, and have for almost 30 years.
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post #6 of 8 (permalink) Old 05-15-2014, 07:08 AM
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Originally Posted by Olskoo View Post
Just had my motor built 500 miles ago and started hearing what I thought was a collapsed lifter, took it back to the shop who built it and the pulled the heads and jugs. Then they found scored pistons front and rear! Was told when the cylinders were bored off center?? Never heard of that. 88" bore to a 95" now a107"


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Do you mean 98" now? You have to replace the crank to get to 107". If they can't do a top end big bore without screwing it up I would not feel comfortable with them splitting cases and setting up a crank correctly.


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post #7 of 8 (permalink) Old 05-15-2014, 08:14 AM
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always finding a shop that 1,dose all the build & machine work in house (I use van norman boring & sunnen honing equipment) or 2, if they don't do the machine work,find out who dose.but really im not sure how simply boring them off center could cause scoring on both cylinders,unless their WAY off and then it goes back on the builder for not catching it.ide be looking at clearance problems or debris from someware else in the motor,both cylinders being scored (if clearances are OK) is a good sign of the rod bearings starting to fail
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post #8 of 8 (permalink) Old 05-15-2014, 09:57 AM Thread Starter
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Yes I did have the crank replaced and the boring was done somewhere else that they sent it to. So far the repairs on them ! I've been trying to upload pictures but haven't been successful ..


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