Crank pulley mod

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Jordan_R

Stock Block Ready To Knock...er..Rock
Joined
Sep 20, 2017
Messages
1,616
Reaction score
3,818
Location
Missouri
Finally got a chance to turn the pulley down. New weight is 5.01lb. That's over 1.59lb of metal removed or roughly 24% of the original pulley weight.
Fun fact, the pulley came from Ford .030" off-center of the core. I'm guessing this is from the rubber dampener curing slightly off. It might not sound like much but .030 is enough to visibly see wobbling on a lathe.
View attachment 13974 View attachment 13975
Good stuff man, when can I send mine your way? Asking my fab guy now if he can get her done
 

Ecoboost_xsport

SHO Member
Joined
Mar 21, 2020
Messages
2,019
Reaction score
3,894
Location
Sacramento, CA
Finally got a chance to turn the pulley down. New weight is 5.01lb. That's over 1.59lb of metal removed or roughly 24% of the original pulley weight.
Fun fact, the pulley came from Ford .030" off-center of the core. I'm guessing this is from the rubber dampener curing slightly off. It might not sound like much but .030 is enough to visibly see wobbling on a lathe.
View attachment 13974 View attachment 13975
Too bad there wasn't a way to get the thing dead nuts centered and get rid of that .030" difference. I guess it could be made from scratch (out of billet) if somebody had the time and/or resources...
 

skyshadow07

On a mission to get below 4000lbs
Joined
Nov 15, 2019
Messages
948
Reaction score
907
Location
Oklahoma
I think the vulcanized rubber takes up the .030" of slop when the engine is running. If made in solid aluminum I could CAD a replication of the stock and have it milled out of billet. Would lose all harmonic dampening abilities though. But would also probably be like 2lbs total.

Jordan, I'll DM you.
 

skyshadow07

On a mission to get below 4000lbs
Joined
Nov 15, 2019
Messages
948
Reaction score
907
Location
Oklahoma
Installed! Here is the old one next to the lightened one. I installed it with downpipes and ester core oil so I can not tell if it made a difference. I mean, laws of physics says it did.
IMG 20200615 184555 IMG 20200615 184551
 

Ecoboost_xsport

SHO Member
Joined
Mar 21, 2020
Messages
2,019
Reaction score
3,894
Location
Sacramento, CA
You run ot through its paces yet? Haven't noticed any weird vibrations or harmonics?

I wouldn't mind having you do this for me to at some point if you're into doing this for those of us who send you one to modify...
 

skyshadow07

On a mission to get below 4000lbs
Joined
Nov 15, 2019
Messages
948
Reaction score
907
Location
Oklahoma
I'll do it for $150 if you send me back your pulley. Or make it $250 to cover the cost of a pulley. Just DM me if you want one. I'll need to know if your car was built before or after Aug 7th, 2016.
 
Back
Top