96 heritage engine issue
Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
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From: Coromandel Peninsula New Zealand
I had an Ironhead Sporty once and that had welds inside the wrist pins to correct the balance factor...not that I would recommend that, but balance factor is everything. My Shovelhead is dead smooth in the cruise, because that is how my Indie balanced it, either side of that it has a bit of vibration but an old guy who rode it when I first had it on the road said that if any of his shovels had been that smooth, he would still have it now.
Just goes to show how important balance factor is....
Just goes to show how important balance factor is....
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Intermediate
Joined: Sep 2022
Posts: 31
Likes: 9
From: Washington
So I received an email from wiseco today and like expected their pistons are quite a bit lighter then the stock pistons. I have not confirmed the stock pistons that i took out yet, but with the info above listing them at 392 the wiseco are 350 so we have a 42g difference per piston so we are looking at a difference of 84g, so asking if they can get wrist pins that heavy to compensate. But that much of a weight balance difference would explain the vibration i am getting. We will see what they say but it looks like i might have to balance the crank shaft.
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Intermediate
Joined: Sep 2022
Posts: 31
Likes: 9
From: Washington
So i got a email back from wiseco, they do not sell a heavier pin that would properly fit is what i was told. Anyone know where i could find a pin that is roughly 127g?
I have some ideas to make a pin but would rather not if i can keep from it. Yes i know balancing the crank would solve this as well but wrist pin seams easier to test with out permeate affects.
Thoughts?
I have some ideas to make a pin but would rather not if i can keep from it. Yes i know balancing the crank would solve this as well but wrist pin seams easier to test with out permeate affects.
Thoughts?
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Intermediate
Joined: Sep 2022
Posts: 31
Likes: 9
From: Washington
Really hopeing i can find or make a heavier pin it would be quicker and i wouldn't have to tear everything down. if i have to do the crank need to tear everything down pull and send it and wait, or tear it apart and do it myself.
I mean if it came down to it i could do it but and it is one of thoose measure 42 times and inch up to the cut 56 times and then hope you didnt cut to much lol, never fails i'd have to start over lol. so i might have someone else do it just to save the headache.
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Intermediate
Joined: Sep 2022
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From: Washington
I know there is no replacement for displacement when it comes to power but i will say upping the compression ratio has given her a good pep in her step. i would love to finish it out the way it is and see what she is capable of on a dyno. Seat dyno she feels damn good until i am sitting on a concrete vibrator.
Seasoned HDF Member
Joined: Mar 2010
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From: Poolville
Apparently the cylinder and piston kit you purchased from V-Twin is not a standard size offered from Wiseco. With that said to compare the weight differences you will need to measure the weight of both stock and the oversized piston kit with a size of 3.5422" and a cylinder bore of 3.5445". You must weigh everything. Pins, rings, circlips and pistons. Also the kit you purchased is a forged piston and according to the advertised bore you need a little more clearance for forged pistons. They expand more with heat than the cast stock pistons. I would look at that. Also I would think that Wiseco Is pretty accurate in designing their pistons including weight to be a direct replacement.
As Max had said I would look closely at the tune and the proper main jet size. You never indicated Carb or jet sizes.
Can you post up pics of the plugs?
As Max had said I would look closely at the tune and the proper main jet size. You never indicated Carb or jet sizes.
Can you post up pics of the plugs?
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Thread Starter
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Intermediate
Joined: Sep 2022
Posts: 31
Likes: 9
From: Washington
Apparently the cylinder and piston kit you purchased from V-Twin is not a standard size offered from Wiseco. With that said to compare the weight differences you will need to measure the weight of both stock and the oversized piston kit with a size of 3.5422" and a cylinder bore of 3.5445". You must weigh everything. Pins, rings, circlips and pistons. Also the kit you purchased is a forged piston and according to the advertised bore you need a little more clearance for forged pistons. They expand more with heat than the cast stock pistons. I would look at that. Also I would think that Wiseco Is pretty accurate in designing their pistons including weight to be a direct replacement.
As Max had said I would look closely at the tune and the proper main jet size. You never indicated Carb or jet sizes.
Can you post up pics of the plugs?
As Max had said I would look closely at the tune and the proper main jet size. You never indicated Carb or jet sizes.
Can you post up pics of the plugs?
I am still trying to understand how tuning would cause a worsening vibration as rpm increases i get poor preformance and detonation causing issues. I will say I am not a stranger to tuning carbs, unfortunately i do not remember the jet sizes. Ever try and sync 4 carbs? Pain in the butt! With that said the bike does not hesitate there is no signs of over or under fueling it is a solid vibration coming out of the engine it would probably push past 4k rpm it is just currently rpm limited to this and with the vibration as bad as it is i know it would probably be a bad idea to push past.
Wiesco stated that the pistons weigh 350g and that wrist pin is 80.5g this is lighter by 47 grams per piston from the stock setup. I do plan on verifying this info my weighing them myself but with the information provided if that is put into a calculation for force at 4000rpm a difference of 94 grams is able to apply 371 lbs of force, don't know about you but that is a hell of a lot of imbalance in the bottom end. As that is the heavy end of the crank that is producing that force I really believe that is the culprit here unless someone can explain how I am either over thinking that or am missing something.
FYI i am not saying i know it all and i am arm chairing it at this point, as i am still tied up on another project in the garage before i start on this. I do appreciate you guys input i am just trying to understand the recommendations that you are giving and filling in any of the info i have forgot to include.
Have not been able to find a heavier pin yet, anyone know who to ask?
Thanks yall
Thread Starter
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Intermediate
Joined: Sep 2022
Posts: 31
Likes: 9
From: Washington
Apparently the cylinder and piston kit you purchased from V-Twin is not a standard size offered from Wiseco. With that said to compare the weight differences you will need to measure the weight of both stock and the oversized piston kit with a size of 3.5422" and a cylinder bore of 3.5445". You must weigh everything. Pins, rings, circlips and pistons. Also the kit you purchased is a forged piston and according to the advertised bore you need a little more clearance for forged pistons. They expand more with heat than the cast stock pistons. I would look at that. Also I would think that Wiseco Is pretty accurate in designing their pistons including weight to be a direct replacement.
As Max had said I would look closely at the tune and the proper main jet size. You never indicated Carb or jet sizes.
Can you post up pics of the plugs?
As Max had said I would look closely at the tune and the proper main jet size. You never indicated Carb or jet sizes.
Can you post up pics of the plugs?
For reference the numbers on the one piston that i can read is "10087M0900 9250L" the other one i can't read the first part but the last bit is "9246L", Anyone know what he last part is looks like some kid of measurement just not sure what.