...

Go Back   Lateral-g Forums > Technical Discussions > Transmission and Rear End
User Name
Password



Reply
 
Thread Tools Display Modes
  #1  
Old 09-01-2020, 12:55 PM
DRJDVM's '69's Avatar
DRJDVM's '69 DRJDVM's '69 is offline
Senior Member
 
Join Date: Jul 2004
Location: Manteca, CA
Posts: 1,250
Thanks: 1
Thanked 5 Times in 5 Posts
Default McLeod twin disk knocking

Looking for some other people input...Ö

Installed a McLeod twin disk on my Gen III Hemi, T56 Magnum build and its noisy as hell. New trans, new pilot, did the bell alignment, new McLeod flywheel, had a local shop balance the assembly etc etc.... so as far as I can tell I did the install spot on...

When the trans is in neutral and clutch out, it knocks like crazy.... best comparison I can make is it sounds like rod knock..... push the clutch in.....totally quiet.

Talked to the guys at Bowler... the company I purchased it through....sent them a video and their feedback is that they have had several McLeod twin sound just like that.... customer brought cars back, thinking something was wrong too..... so apparently this is "normal" for these set up..... WTH... they basically feel like the are noisy but work just fine

Some other stuff came up and I had to pull the motor and trans anyway, so its all out of the car now and visually it looks normal. The car was only run around the block a few times, so the set up has less than 3-5 miles tops.

I'm going to call McLeod and get there input but looking for some real world unbiased opinions.... thoughts?
Reply With Quote
  #2  
Old 09-01-2020, 01:15 PM
dontlifttoshift's Avatar
dontlifttoshift dontlifttoshift is online now
Senior Member
 
Join Date: Oct 2012
Location: Beach Park. IL
Posts: 856
Thanks: 5
Thanked 72 Times in 49 Posts
Default

I have had similar issues with Centerforce Dyads......I have had some of those that were quiet.

***Edit, I missed that the noise goes away when you push the clutch in......which is the opposite of what happens when the floater discs start rattling around.
__________________
Donny

Support your local hot rod shop!

Last edited by dontlifttoshift; 09-02-2020 at 07:41 AM.
Reply With Quote
  #3  
Old 09-01-2020, 04:15 PM
will69camaro will69camaro is online now
Senior Member
 
Join Date: Dec 2004
Location: Houston
Posts: 1,377
Thanks: 165
Thanked 102 Times in 58 Posts
Default

Spec super twin is noisy when the clutch is pressed. Put in neutral and let clutch out and it quiets down. That to me is normal for multi-disc clutch setup.

For it to be noisy with the clutch OUT in neutral seems weird to me. Discs should be locked and turning with the Pressure Plate / Flywheel.
__________________
Texas A&M BSME 2008
1969 Camaro - Hugger Orange
1969 C10 SWB - Hugger Orange
2018 GMC Denali HD
Reply With Quote
  #4  
Old 09-02-2020, 04:16 AM
Beechy's Avatar
Beechy Beechy is offline
Senior Member
 
Join Date: Nov 2014
Location: Melbourne, Australia
Posts: 243
Thanks: 85
Thanked 73 Times in 55 Posts
Default

If the throwout is fork style then it could be the lever getting jammed inside bellhousing because the clutch pack is thicker (and the flywheel could be a tick thicker) and the fork is pushed back steeper angle.

If it's hydraulic TOB then it could be the TOB housing or NEW trans casting hitting the pressure plate or pp retaining bolts when the crank moves rearward a few thousandths in it's thrust bearing when pedal pressure comes off.

Could be a complication inside the pp if you've over stroked the fingers.....lets hope not.

As will69 said "it should be noisy disengaged" (pedal down) cos the intermediate plate between the friction plates will rattle in its retaining bosses. That will be a rattle NOT rod-knock-sound.
Later....
__________________
Jim Grant
Melbourne, Australia
(Dual citizen)

Last edited by Beechy; 09-02-2020 at 04:45 AM. Reason: Reading the original post proper...wink
Reply With Quote
  #5  
Old 09-02-2020, 03:58 PM
anguilla1980's Avatar
anguilla1980 anguilla1980 is offline
Member
 
Join Date: Aug 2016
Location: Bakersfield, CA
Posts: 34
Thanks: 20
Thanked 10 Times in 6 Posts
Default

By far the most quiet twin disc I've run so far is the RAM. I'm running a hybrid version from them on my Magnum now that's good for up to 700ft/lbs or more. Acts and sounds just like an OEM clutch. I couldn't be happier with it.
__________________
https://www.TheFoat.com/92GTA
1969 Pontiac Firebird w/535ci IAII aluminum block, Dailey dry sump, Holley EFI (full road race build). Primer black w/black interior.
1992 Pontiac Trans Am GTA w/SLP Performance Package. Dark Jade Grey Metallic, grey leather, T-Tops.
Reply With Quote
  #6  
Old 11-15-2020, 12:41 PM
pannetron's Avatar
pannetron pannetron is offline
Junior Member
 
Join Date: Dec 2014
Location: Colorado high country
Posts: 17
Thanks: 31
Thanked 10 Times in 8 Posts
Default

I have a McLeod RXT behind my T56 Magnum and it's pretty quiet at idle in neutral. I do get gear rattle from the transmission at around 1800-1900 RPM in gear but my clutch isn't noisy.
Reply With Quote
  #7  
Old 11-24-2020, 01:13 PM
DRJDVM's '69's Avatar
DRJDVM's '69 DRJDVM's '69 is offline
Senior Member
 
Join Date: Jul 2004
Location: Manteca, CA
Posts: 1,250
Thanks: 1
Thanked 5 Times in 5 Posts
Default

Still dealing with this issue...

The rattle is in neutral, clutch out, car at idle......... push the clutch in and noise stops about 1/2 way in..... so it sounds like opposite of what other people are saying when they have some rattle from a Twin disc set up

I can rev the motor pretty high and don't hear or feel a vibration....

I had local machine shop balance the flywheel and clutch.....could they have F-ed it up?
Reply With Quote
  #8  
Old 11-29-2020, 11:17 AM
Spiffav8's Avatar
Spiffav8 Spiffav8 is offline
Lateral-g Moderator
 
Join Date: Apr 2007
Location: Las Vegas, NV
Posts: 4,566
Thanks: 368
Thanked 236 Times in 126 Posts
Default

Quote:
Originally Posted by DRJDVM's '69 View Post
Still dealing with this issue...

The rattle is in neutral, clutch out, car at idle......... push the clutch in and noise stops about 1/2 way in..... so it sounds like opposite of what other people are saying when they have some rattle from a Twin disc set up

I can rev the motor pretty high and don't hear or feel a vibration....

I had local machine shop balance the flywheel and clutch.....could they have F-ed it up?
Iíve had the same issue. Trans and Clutch coming out shortly. Iíll let you know what I find.
__________________
Curtis
Pilots: We're not better than you, just way cooler.

NO ONE IS COMING. IT'S UP TO US.

http://www.navysealfoundation.org/
Reply With Quote
  #9  
Old 11-29-2020, 01:02 PM
DRJDVM's '69's Avatar
DRJDVM's '69 DRJDVM's '69 is offline
Senior Member
 
Join Date: Jul 2004
Location: Manteca, CA
Posts: 1,250
Thanks: 1
Thanked 5 Times in 5 Posts
Default

Hey Curtis
Due to a motor issue I had to pull everything out and it all looked visually normal. so I couldn't find a source....put it all back together after verifying bell alignment and being very careful to make sure everything was installed correctly.... still there

There is another thread in the main general forum where it was mentioned that the noise may be from the T56, not the clutch assembly.... doesn't sound like gear whine... more like a knock to me
Reply With Quote
  #10  
Old 11-30-2020, 11:14 AM
Spiffav8's Avatar
Spiffav8 Spiffav8 is offline
Lateral-g Moderator
 
Join Date: Apr 2007
Location: Las Vegas, NV
Posts: 4,566
Thanks: 368
Thanked 236 Times in 126 Posts
Default

Quote:
Originally Posted by DRJDVM's '69 View Post
Hey Curtis
Due to a motor issue I had to pull everything out and it all looked visually normal. so I couldn't find a source....put it all back together after verifying bell alignment and being very careful to make sure everything was installed correctly.... still there

There is another thread in the main general forum where it was mentioned that the noise may be from the T56, not the clutch assembly.... doesn't sound like gear whine... more like a knock to me
Your description is spot on to what I've been experiencing. Just blew the rear seal out of my T56 while racing a AMG GT-R on the freeway (I won, so totally worth it) and may upgrade to the Magnum-F (F-Body) if it will fit. I'll let you know if it goes away.
__________________
Curtis
Pilots: We're not better than you, just way cooler.

NO ONE IS COMING. IT'S UP TO US.

http://www.navysealfoundation.org/
Reply With Quote
The Following User Says Thank You to Spiffav8 For This Useful Post:
anguilla1980 (11-30-2020)
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 05:07 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Copyright Lateral-g.net