Vibration Gone? I hope so
Thread Starter
Team Owner
Joined: Aug 1999
Posts: 42,487
Likes: 47
SPARTAN
CI 3-4-5-6-8-9-10 Vet
CI-9 AutoX Winner
CI-3 Go Kart Champ
St. Jude '03-'04-'05-'06-'07-'08-'09-'10-'11
Vibration Gone? I hope so
I've been living unhappily with a vibration around 2500rpm for the past couple years. Finally think I found the source of it....flywheel/clutch imbalance.
Last year, I had the trans out, found that the POS pilot bearing had an outer sleeve that came off. Put in a bushing and figured that was the problem. Nope.
This year, I took the trans out again and took the flywheel/pressure plate assembly to a shop that specializes in balancing. When I dropped it off, the guy there put it on one of their balancers and spun it up. 70-80 inch-grams out of balance (i.e. at one inch from center, it would require 70 grams -2.5 ounces- to balance). The guy said it was WAY off in terms of balancing.
Got it back a few days ago. Don't have it fully in yet. The flywheel had only 2 balance holes drilled into it. He added 6 or 7 more. Inch-grams don't mean a whole lot to me, but those holes sure do.
It's GOTTA be better.
Cost: $75. Bargain if it helps
Last year, I had the trans out, found that the POS pilot bearing had an outer sleeve that came off. Put in a bushing and figured that was the problem. Nope.
This year, I took the trans out again and took the flywheel/pressure plate assembly to a shop that specializes in balancing. When I dropped it off, the guy there put it on one of their balancers and spun it up. 70-80 inch-grams out of balance (i.e. at one inch from center, it would require 70 grams -2.5 ounces- to balance). The guy said it was WAY off in terms of balancing.
Got it back a few days ago. Don't have it fully in yet. The flywheel had only 2 balance holes drilled into it. He added 6 or 7 more. Inch-grams don't mean a whole lot to me, but those holes sure do.
It's GOTTA be better.
Cost: $75. Bargain if it helps
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Where did the suspect flywheel come from? A previous owner installation?
There is actually a very good moral in this story, that for perfect engine operation, everything from front to back should be balanced. There is even a shop here in my town that will balance drive shafts.
I hope that fixed your problem.
There is actually a very good moral in this story, that for perfect engine operation, everything from front to back should be balanced. There is even a shop here in my town that will balance drive shafts.
I hope that fixed your problem.
Thread Starter
Team Owner
Joined: Aug 1999
Posts: 42,487
Likes: 47
SPARTAN
CI 3-4-5-6-8-9-10 Vet
CI-9 AutoX Winner
CI-3 Go Kart Champ
St. Jude '03-'04-'05-'06-'07-'08-'09-'10-'11
Flywheel is the one that;s been on the car for the 11 years I've owned it. Clutch (Ram) was new as of whenever I did the T5 swap. 3 years ago maybe? I suspect the pressure plate more than the flywheel.
