[TR] Lightening TR3 Flywheel

davehogye dlhogye at comcast.net
Sat Jan 9 22:00:11 MST 2016

Very informative drawings. Pretty neat. 
The lighter of the factory flywheels, weigh 29 lbs. with ring gear. The heavier unit weighs 34 lbs. 
With the availability of new light flywheels, I wouldn't consider lightening a stock unit. 
Both steel and aluminum flywheels are available new. BPNorthwest has them. Both weigh less than 10lbs. without the ring gear. Bolt on ring gear is extra. Summit might have a better price on the aluminum Fidanza. Fidanza is probably supplying BPN. 
The steel flywheels are drilled for TR4A-TR6 pressure plate, but don't let that stop you from making this change. The later diaphragm pressure plate is also lighter and improved. The aluminum units are drilled for both TR3s and the later 4A-6 pressure plates. Other considerations...aluminum flywheels have a replaceable friction surface and steel units should to be resurfaced when changing the clutch disc. I would recommend balancing new flywheels. The pressure plate too. Balancing isn't really necessary for a street car, but it wouldn't hurt. 
The lighter the smoother the better. 

Dave H. 

----- Original Message -----

From: "Randall" <TR3driver at ca.rr.com> 
To: "Bill Brewer" <billbrewer59 at yahoo.com> 
Cc: triumphs at autox.team.net 
Sent: Saturday, January 9, 2016 2:42:09 PM 
Subject: Re: [TR] Lightening TR3 Flywheel 

> ISTR that there are instructions somewhere on lightening 
> a stock TR3 flywheel. Anyone on the list have it? I don't 
> have Kastner's competition prep book. I did find a grainy 
> instruction diagram in Vizard's competition prep book. 

Here's what I have. The Kastner books I checked don't give details for lightening. 

You might try talking to Joe Alexander. ISTR he said he had a shop that knew how to remove 7 lb or so. He did a run of lightweight 
steel flywheels made, but I think they're all gone and I've not heard that he plans to get more made. 

Of course, there's always the alloy Fidanza, available through Summit and others. I've been very happy with mine, but there are 
some concerns so that may be more than you want for your Morgan. The racers seem to have a hard time keeping them on the crank, but 
that hasn't been an issue for me on the street. I still had to heat it up with a torch to get it off the old 3A motor, after 
roughly 50K miles. (The instructions note that it is a light press fit onto the crankshaft and suggest using heat to remove it.) 


** triumphs at autox.team.net ** 

Donate: http://www.team.net/donate.html 
Archive: http://www.team.net/archive 
Forums: http://www.team.net/forums 
Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/dlhogye@comcast.net 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/triumphs/attachments/20160110/93807edf/attachment.html>

More information about the Triumphs mailing list