95" bore What the ^%$
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Road Captain
Joined: Oct 2007
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95" bore What the ^%$
I could not believe this from a local machine shop that everyone told me they do a great jod on cylinders. I take my 88 jugs in to get them bored to 95. A few days later the guy calls and says are you sure you want to cut that much out of your cylinders. I say what!!! Yeah this is the standard jump for the 88. Then I asked him if he has bored HD 's before. Yes I have done several over he years. My next question was, do you have a torque plate to fit the 88 jugs. Now I am not a machinist but I am pretty sure this is something that ill make or break the proces of the upgrade. I offered to get them a plate to bore my jugs and he said it is not needed. Next I call up our local steel shop and give them the dimensions we needed cut and he says are you making a torque plate(He knows we work on bikes). To shorten the story. He is making the plate and turned us on to a guy that will bore both for $70 The torque plate is costing all of 20 bucks + bolts. Needless to say I pick my jugs up in the morning from the other shop.
6th Gear
Joined: Feb 2010
Posts: 14
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I may be preachin' to the chior here but, torque plates should always be used. It is most important during the honing process. You will get disortions in the cylinder from torquing down the head that can cause some funky piston and ring wear if they are not used (not to mention the loss of efficiency from improper ring seal).
I would also ask any shop what their honing process is and what kind of machine they use (i like sunnen machines). I am just getting started doing my own work on my bike but have been building my own engines for years and the best work i have seen has come from shops that do hot honing. They heat the part (cylinder/block) to operating temperature during the honing process. I am not sure if any Harley builders are doing this but I think i will modify my small engine honing machine to do this for my build. This is not for the amature builder though. Break-in can be a little tricky because of tolerances.
I would also ask any shop what their honing process is and what kind of machine they use (i like sunnen machines). I am just getting started doing my own work on my bike but have been building my own engines for years and the best work i have seen has come from shops that do hot honing. They heat the part (cylinder/block) to operating temperature during the honing process. I am not sure if any Harley builders are doing this but I think i will modify my small engine honing machine to do this for my build. This is not for the amature builder though. Break-in can be a little tricky because of tolerances.
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