Balancing piston weights
Thread Starter
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Stellar HDF Member
Joined: Jun 2018
Posts: 2,295
Likes: 494
From: WI
The rod ends are stock whatever weight from the manufacturer. I got both pistons to The same gram weight, and then I just do the install. It all seems like it came out good so far. I’ve done the heat cycles on the motor now it just has to be ridden.
Thread Starter
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Stellar HDF Member
Joined: Jun 2018
Posts: 2,295
Likes: 494
From: WI
I will keep everyone posted.
it is going to be a while before I can ride
contrary to everything I believe
i’m gonna let a brother do the first
50 mile break in
I don’t like anyone driving my motorcycle
but considering some physical setbacks
i’m limited as to what I can do
so believing in
someone else is a must
at this point in time.
we’ll finish this post as soon as possible
Knowledge is power…..
then comes understanding……
and with understanding comes wisdom……
:i con_wheel:
😎
it is going to be a while before I can ride
contrary to everything I believe
i’m gonna let a brother do the first
50 mile break in
I don’t like anyone driving my motorcycle
but considering some physical setbacks
i’m limited as to what I can do
so believing in
someone else is a must
at this point in time.
we’ll finish this post as soon as possible
Knowledge is power…..
then comes understanding……
and with understanding comes wisdom……
:i con_wheel:😎
Last edited by Harley1004; Aug 2, 2022 at 07:50 PM.
Thread Starter
|
Stellar HDF Member
Joined: Jun 2018
Posts: 2,295
Likes: 494
From: WI
Thread Starter
|
Stellar HDF Member
Joined: Jun 2018
Posts: 2,295
Likes: 494
From: WI
gently milled the underside of the piston .006inch underneath the crown of the piston.
then gently working side to side on the pin boxes, I used a flapper wheel in my Dremel and removed equal amounts of material in the front and the back of each pin boss. I hope it lasts, I guess I’m gonna find out. Like I said we finished putting the motorcycle together yesterday and put it through heat cycles. So far so good. Surdyke Harley finally got back to me today saying they would warrantee the Pistons and send me another set, but it’s too late. I’m not going to tear my engine back down just to give him some bad pistons. Moving forward, if I ever build another top end, it sure in the hell will not be Harley Davidson parts. Their quality control is less than desirable as far as I’m concerned. When I get some serious miles on this motor, I’ll come back and finish it out. But it may not be until next year, because I’m gonna be laid up for a while.
then gently working side to side on the pin boxes, I used a flapper wheel in my Dremel and removed equal amounts of material in the front and the back of each pin boss. I hope it lasts, I guess I’m gonna find out. Like I said we finished putting the motorcycle together yesterday and put it through heat cycles. So far so good. Surdyke Harley finally got back to me today saying they would warrantee the Pistons and send me another set, but it’s too late. I’m not going to tear my engine back down just to give him some bad pistons. Moving forward, if I ever build another top end, it sure in the hell will not be Harley Davidson parts. Their quality control is less than desirable as far as I’m concerned. When I get some serious miles on this motor, I’ll come back and finish it out. But it may not be until next year, because I’m gonna be laid up for a while.
Last edited by Harley1004; Aug 2, 2022 at 09:19 PM.
6th Gear
Joined: Feb 2022
Posts: 12
Likes: 19
From: New Hampshire
are you comparing complete assemblies or just pistons?.. 7+grams seems excessive. I'm used to 2-3 typically unless they're S&S pistons w clearance cut in rear only but, even those are closer than that... you might try measuring both pistons to be sure that one isn't an o.s. while odd, I wouldn't let it stop me. the pistons factor into the balance plot at 60% & that's a total weight divided by 2 ( f&r).. if you feel you must remove material, tread lightly. both cast & forged pistons are processed under pressure for stability sake, removing material from underboss @ w/p can relax the material losing the taper & sizing.. measure both before you start. & after.. if you can't wrap your head around my advice, think about this, the rear rod weighs about 65lbs more than the f-rod. if you feel you need to take corrective action , install lighter piston on the heavier rod...
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Thread Starter
|
Stellar HDF Member
Joined: Jun 2018
Posts: 2,295
Likes: 494
From: WI
are you comparing complete assemblies or just pistons?.. 7+grams seems excessive. I'm used to 2-3 typically unless they're S&S pistons w clearance cut in rear only but, even those are closer than that... you might try measuring both pistons to be sure that one isn't an o.s. while odd, I wouldn't let it stop me. the pistons factor into the balance plot at 60% & that's a total weight divided by 2 ( f&r).. if you feel you must remove material, tread lightly. both cast & forged pistons are processed underr pressure for stability sake, removing material from underboss @ w/p can relax the material losing the taper & sizing.. measure both before you start. & after.. if you can't wrap your head around my advice, think about this, the rear rod weighs about 65lbs more than the f-rod. if you feel you need to take corrective action , install lighter piston on the heavier rod...
