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post #1 of 5 (permalink) Old 12-23-2010, 12:36 PM Thread Starter
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Big Bore - Torque Plate

Do you guys provide a torque plate when having the cylinder bored?

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post #2 of 5 (permalink) Old 11-05-2011, 10:39 PM
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the shop should be able to mill one out. most people aren't going to have a tq plate available when they drop the jugs off. i am really wondering if it'd affect anything on a steel liner aluminum block anyway. theres not gonna be alot of deflection transfer there i don't think. not like a nikasil block or car motor..


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post #3 of 5 (permalink) Old 12-11-2011, 01:37 AM
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Torque plate is totally unnecessary on such short cylinders. Tall cylinders like Harleys and automotive blocke use them.

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post #4 of 5 (permalink) Old 06-18-2012, 02:07 PM
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OK, I hear everyone say that they should be in torque plates to accurately measure bores, and Iím OK with that, although Strato9r makes a good point in that even in torque plates the cylinders wonít have the same profile as they will when theyíre warmed up/hot from actual combustion, so how much error does THAT induce? I most assuredly want to doing this right, but:

a) I donít want to spend money for service Iím perfectly capable of performing myself, given good guidance from experts with experience.
b) I have more faith in my abilities than I would a (currently) unknown mechanic who may not have the same vested interest as I do.
c) I want to establish whether my parts are still in good shape and therefore reusable.

Harley says I can measure bores in a torque plate, but says you canít measure pistons, so how would a reputable shop do that to confirm moving parts and fixed parts mate? In other words, how do I know if the pistons are worn, regardless of bore condition?
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post #5 of 5 (permalink) Old 06-19-2012, 02:13 AM
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not sure if spam, or very confused.

btw.. a torque plate is not used to measure a bore. a torque plate is used to MACHINE a bore under a deck load to maintain concentricity in the bore itself when the head is bolted down.

i cant find a pic of what i saw once (an extreme case) of a bore that damn near had a pentagon shape to it after boring when it was torqued down. causes the rings to not seat..


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