Balance a singe mass FW?
Melting Slicks
Joined: Jan 2002
Posts: 2,784
Likes: 3
From: Atlanta GA
Re: Balance a singe mass FW? (devilfish)
I was looking into the conversion... I was turned off by the fact, that when the clutch is out and car is in nuetral, the tranny sounds like it got rocks in it...
People also say that the rplacement flywheels are acually .100" too think.
Most People Zero balance the flywheel I have been told...
Maybe someone who did it will chime in
People also say that the rplacement flywheels are acually .100" too think.
Most People Zero balance the flywheel I have been told...
Maybe someone who did it will chime in
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 3,010
Likes: 1
From: Sweden/Stockholm
Re: Balance a singe mass FW? (StealDads67)
THanks
I really dont care about the noise, as my cars isent a dyali driver. Im just whant more preformance..
As long it doesnt hurt the tranny that is.. :confused:
I really dont care about the noise, as my cars isent a dyali driver. Im just whant more preformance..
As long it doesnt hurt the tranny that is.. :confused:
Melting Slicks
Joined: Jan 2002
Posts: 2,784
Likes: 3
From: Atlanta GA
Re: Balance a singe mass FW? (devilfish)
Oh ok... well no it shouldn't hurt that tranny at all... Im under the impression some people that the Camaro Flywheel and use that. Not positive, Check the arctives
Burning Brakes
Joined: Nov 2002
Posts: 1,097
Likes: 1
From: Abita Springs LA
Re: Balance a singe mass FW? (devilfish)
Hate to say this, but the most silent smf are ones that are balanced with the rotating assembly. Then and only then will you have silence. But if you wanna change it without balancing the lower crank assembly, I would have it center balanced to match your dual mass.
Drifting
Joined: Dec 2002
Posts: 1,861
Likes: 4
From: Houston TX
Re: Balance a singe mass FW? (devilfish)
Don't know about balancing when converting from a DM to a SM flywheel, but I just put a ZF into my '87 and am using a stock ZF clutch assembly (including unsprung clutch disc) with the stock '87 4+3 single mass flywheel, and the only time the trans makes noise is under hard acceleration between 2-3k rpm. I checked it with the clutch out in neutral and it's quiet.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Safety Car
Joined: Apr 1999
Posts: 4,623
Likes: 2
From: Ohio
Re: Balance a singe mass FW? (devilfish)
The only reason to neutral balance any flywheel is if you have balanced your engine internally. If your engine is stock or was re-built externally balanced then you must use the FW assembly to balance the back half of your engine. You would need to have the old DM assembly to copy the exact location of the counterweight so you could "transfer" or duplicate the position and amount of the weight on your new FW...whatever it is.
Drifting
Joined: Dec 2002
Posts: 1,861
Likes: 4
From: Houston TX
Re: Balance a singe mass FW? (devilfish)
The FW on my car wasn't balanced when I did the trans swap, but it's also the stock FW for that engine. I would assume, thinking through it logically, that there would not be a need for the flywheel to be balanced to the engine, and here's my logic:
If you look at the manual and automatic trans engines, they're all the same (except in '96, of course) However, if the two engines are internally identical, then the difference between the engines becomes the flywheel/flexplate. Assuming you're using a stock flywheel, or one designed for a stock externally balanced SBC for your year, it should work without additional machining or balancing. Just comparing the '88 and '89 engines, they used the same rods, same pistons, same pins, same crank, etc, etc, so for production tolerances, they should be balanced the same amount in the same location on the flywheel to make interchanging them simple.
Just my logic
If you look at the manual and automatic trans engines, they're all the same (except in '96, of course) However, if the two engines are internally identical, then the difference between the engines becomes the flywheel/flexplate. Assuming you're using a stock flywheel, or one designed for a stock externally balanced SBC for your year, it should work without additional machining or balancing. Just comparing the '88 and '89 engines, they used the same rods, same pistons, same pins, same crank, etc, etc, so for production tolerances, they should be balanced the same amount in the same location on the flywheel to make interchanging them simple.
Just my logic
Burning Brakes
Joined: Oct 2002
Posts: 1,152
Likes: 1
From: Wichita KS
Re: Balance a singe mass FW? (h rocks)
As mentioned above, if you are replacing a DM flywheel with an SM, then the best you can do is take the exsisting DM & the new SM down to a machine shop that does balancing work and have them duplicate the balance of the old DM on the new SM, they may have to add a counter weight or "heavy metal" to the SM but it can be duplicated, just be sure the balancing is done relative to the 3/8" "clocking" dowel on both flywheels...
:seeya
:seeya
Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
Re: Balance a singe mass FW? (devilfish)
If you add a Camaro single mass flywheel, you don't need to balance it. Both engines (LT1 from a Corvette or Camaro) are both externally balanced so don't even think of neutral balancing it unless you have internally balanced your crank, etc.
There is provisions to fine tune the balance of both the stock dual mass and the Camaro, but I don't think it can be very accurate as the holes (for the balance pins) for either flywheel are not in the same spots. And if you try to balance a dual mass to a single mass...how do you account for the moving section of the dual mass??? If it moves, the balance will move as well-like a tire slipping on a wheel-balance won't be any good. I did not balance my Camaro flywheel-just milled it and installed it-9000 miles later-works like new.
Yes the Camaro is thicker than the Corvette-they aren't supposed to be interchangeable-it is a low buck modification.
Either pay the money for a aluminum job, buy a new dual mass, or go for the inexpensive Camaro setup. I chose the latter. I'm happy.
More info via SEARCH or on my home page...old topic.
:yesnod:
There is provisions to fine tune the balance of both the stock dual mass and the Camaro, but I don't think it can be very accurate as the holes (for the balance pins) for either flywheel are not in the same spots. And if you try to balance a dual mass to a single mass...how do you account for the moving section of the dual mass??? If it moves, the balance will move as well-like a tire slipping on a wheel-balance won't be any good. I did not balance my Camaro flywheel-just milled it and installed it-9000 miles later-works like new.
Yes the Camaro is thicker than the Corvette-they aren't supposed to be interchangeable-it is a low buck modification.
Either pay the money for a aluminum job, buy a new dual mass, or go for the inexpensive Camaro setup. I chose the latter. I'm happy.
More info via SEARCH or on my home page...old topic.
:yesnod:
Burning Brakes
Joined: Oct 2002
Posts: 1,152
Likes: 1
From: Wichita KS
Re: Balance a singe mass FW? (No Go)
And if you try to balance a dual mass to a single mass...how do you account for the moving section of the dual mass??? If it moves, the balance will move as well-like a tire slipping on a wheel-balance won't be any good.
I've rode in Vette's with the cast iron SM flywheel conversion & the noise is not nearly as bad as my aluminum SM is, IMHO it's due to the SM cast iron flywheel's ductility absorbing a certain amount of the chatter/harmonics, cast iron has very good density, it's very stable & cancels vibration's well, that is why most machine tools from mill's to lathes are made from cast iron...
You have probably heard of the old trick about "ringing" a crankshaft by lightly tapping it to tell if it is forged or cast iron..the forged crank will "ring" & the cast crank won't...same theory the grain structure in a casting cancels out the vibrations... just something to consider.
:seeya