RPM vibration - / Conceptually correct?
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,638
Likes: 3
RPM vibration - / Conceptually correct?
OK guys'
I need to know if my feeble brain is firing on enough neurons to understand correc tly.
I have an RPM specific vibration - always shows up at about 3300 - doesn't matter what gear - or in neutral.
So I'm working on the assumption that it is either flywheel or clutch
It has to be before the tranny right?
It's a problem because I changed motor, clutch, flywheel, and trans all at once so i'm having a little problem isolating the cause. (The motor ran smooth in the previous application - so I'm assuming it's OK)
I am having the iron flywheel called for by GM (zz4 one piece seal)spun along with the Fidanza aluminum one - to see if they match. then I will put a new clutch onto the assembly and spin that -
So what am I missing?
Carl "dazed and confused" Johansson
I need to know if my feeble brain is firing on enough neurons to understand correc tly.
I have an RPM specific vibration - always shows up at about 3300 - doesn't matter what gear - or in neutral.
So I'm working on the assumption that it is either flywheel or clutch
It has to be before the tranny right?
It's a problem because I changed motor, clutch, flywheel, and trans all at once so i'm having a little problem isolating the cause. (The motor ran smooth in the previous application - so I'm assuming it's OK)
I am having the iron flywheel called for by GM (zz4 one piece seal)spun along with the Fidanza aluminum one - to see if they match. then I will put a new clutch onto the assembly and spin that -
So what am I missing?
Carl "dazed and confused" Johansson
Last edited by Carl Johansson; Jun 30, 2006 at 11:43 AM.
Safety Car
Joined: Sep 2003
Posts: 3,599
Likes: 24
From: Orange County NY
St. Jude Donor '10-'11-'12-'13
I think you're on the right track.
Although the Fidanza is supposed to be a direct replacement, many have found that it requires additional balancing.
When I had vibration issues, it was right at 3000. Match balanced the Fidanza flywheel and presto - vibration gone.
Although the Fidanza is supposed to be a direct replacement, many have found that it requires additional balancing.
When I had vibration issues, it was right at 3000. Match balanced the Fidanza flywheel and presto - vibration gone.
Thread Starter
Drifting
Joined: Sep 2004
Posts: 1,638
Likes: 3
Originally Posted by 500hp
Did you get all the stock accessory brackets and bolts reinstalled on the front of the motor? Did you eliminate any brackets or braces because of headers, etc.?
i will need to replace the top alt bracket - it broke - though the welder down the street is giving it a go at repairing it - so we will see.
The big problem is gunna be remembering where everything attaches - andf how it was routed! I should have been smart and sprung for a decent digital camera before I tore it down!
I have eliminated the air pump - and fabbed up a small pulley mounted on a custom bent piece of bar stock to keep the belt routing correct - went to a shorter belt to compensate- then took off those tubes on top of the headers - and filled the holes with a little weld - there's alot more room to work in there now!
Carl Johansson
