Excessive Engine Vibration or Normal?
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Intermediate
Joined: Sep 2024
Posts: 35
Likes: 25
From: Tulsa OK
Excessive Engine Vibration or Normal?
I rebuilt top end 99 FLSTC (Heritage) Evo 20k miles at rebuild.
honed cylinders
Wiseco 10:1 domed pistons, hastings rings
Cometic gaskets
MLS .030 head gaskets
V Thunder EVL 3020 Cam (.50 lift)
Adjustable pushrods
Cleaned heads, lapped valves, new seals
New cam bearing, spacer, breather gear and spacer, cam seal
New ultima single fire ignition and coil
CV40 carb jetted 48, 195, 3 turns
Used 10w40 conventional oil for first 50 miles then put in royal purple break in oil for next 500-1000 miles.
the problem is it vibrates so hard at high rpms my feet vibrate off the damn footboards. Even at high highway speeds in 5th gear.
This softail has solid motor mounts and I'm just wanting to confirm this can be expected from the new cam or not. I don't know what else it could be caused by.
I just got done double checking cam, crank, and breather gear alignment, it was good. Also checked adjustable pushrods 4 turns, 32 pitch
Do you have to make sure front cylinder is on compression stroke at TDC when you align the marks or just rotate it all until it's all lined up doesn't matter about when they line up? Cuz cam gear rotates slower than the others.
honed cylinders
Wiseco 10:1 domed pistons, hastings rings
Cometic gaskets
MLS .030 head gaskets
V Thunder EVL 3020 Cam (.50 lift)
Adjustable pushrods
Cleaned heads, lapped valves, new seals
New cam bearing, spacer, breather gear and spacer, cam seal
New ultima single fire ignition and coil
CV40 carb jetted 48, 195, 3 turns
Used 10w40 conventional oil for first 50 miles then put in royal purple break in oil for next 500-1000 miles.
the problem is it vibrates so hard at high rpms my feet vibrate off the damn footboards. Even at high highway speeds in 5th gear.
This softail has solid motor mounts and I'm just wanting to confirm this can be expected from the new cam or not. I don't know what else it could be caused by.
I just got done double checking cam, crank, and breather gear alignment, it was good. Also checked adjustable pushrods 4 turns, 32 pitch
Do you have to make sure front cylinder is on compression stroke at TDC when you align the marks or just rotate it all until it's all lined up doesn't matter about when they line up? Cuz cam gear rotates slower than the others.
Last edited by Lando Evo; Oct 13, 2024 at 03:25 PM.
HDF Community Team
Joined: Dec 2005
Posts: 5,442
Likes: 2,639
From: NC USA
Wiseco pistons are substantially lighter and that changes the factory balance factor.
Last time I ciphered it - the stock bore Wisecos are 45 grams lighter than stock. That's 45 x 2 = 90 grams and doing the math it changes a balance factor of 60 to about 63.4 best I can remember.
Yeah, it gives them the shakes.
Last time I ciphered it - the stock bore Wisecos are 45 grams lighter than stock. That's 45 x 2 = 90 grams and doing the math it changes a balance factor of 60 to about 63.4 best I can remember.
Yeah, it gives them the shakes.
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,636
Likes: 3,398
From: Cental, MI
Even so...Changing weight...changes Factor...sometimes Negatively...at some times in a Positive direction...depending on RPM operating Range!
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Seasoned HDF Member
Joined: Dec 2005
Posts: 20,030
Likes: 8,086
From: poway
FWIW I wonder if pick up in vibes resulted from the motor having a higher compression ratio and it's making more power. Also since the combustion efficiency has increased, the motor needs less timing.
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Seasoned HDF Member
Joined: Jul 2014
Posts: 8,636
Likes: 3,398
From: Cental, MI
Heard this alot... Did Not work that way when we were Racing.. But...we aint Racing...so...Carry on.