Visit our Twitter feed for more great content
AHExp

The 3000 Forum

Gearbox topic continuation - lightened flywheel....

Moss Motors
AutoShrine Sponsor
AutoShrine Sponsor
AutoShrine Sponsor
AutoShrine Sponsor

Htimsc Avatar
Htimsc Gold Member Chris Smith
Portola Valley, USA   USA
One member suggested when (if) the gearbox conversion to the Toyota 5-speed is done that the flywheel should be swapped out for a lightened version.

Is there only one weight or are there many?
If many, what is the most common for the Everyman owner?
I contacted Toms Imports in Oregon and they have lost their specialist machine shop supplier to retirement, and have none in stock. They have not found a satisfactory replacement supplier. Where would I purchase one?

Thanks in advance,

Chris

. Hide banner ads & support this website by becoming a > Gold Supporting Member <
Randy Forbes Avatar
Parrish, FL, USA   USA
1957 Austin-Healey 100-Six
1999 BMW M Coupe "Blue Car"
1999 BMW M Roadster "Black Car"
2001 BMW M Roadster "Gray Car"
Any machinist worth his metal chips__and with a lathe that has adequate swing__can lighten a flywheel. Radiused edges are preferred over straight-cut, but the guy that did mine had likely 50-60 yrs experience with them.

Stock 29D flywheel



The one that's been in my car for the last thirty (>30) years



Removing the metal as outboard as possible is the most beneficial (from both front and back). This flywheel, along with the entire rotating and reciprocating assemblies were all balanced.



At twenty (20.2) pounds, it is merely a lighter flywheel, but an aluminum one could easily be down around twelve (12?) pounds. While the reduction of just six (6.6) pounds made a noticeable improvement in picking up the revs (really uncanny when you kill the ignition, and it just STOPS...) but go too light and you probably won't enjoy city-driving much.

Htimsc Avatar
Htimsc Gold Member Chris Smith
Portola Valley, USA   USA
Thanks, I also found an exchange of notes from the British car forum discussing the why’s and wherefore’s. Also a technical paper on the topic.

All I need is a source.

. Hide banner ads & support this website by becoming a > Gold Supporting Member <
rusty1c Avatar
rusty1c Peter D
Antioch, CA, USA   USA
1961 Austin-Healey 3000 BT7 "RUBY"
1963 Chevrolet C10 "Rusty"
Chris,
Google "engine machine shops, San Jose" there are 3 or 4 that get good ratings on yelp.
Any one of these should be able to handle the job.
Pete

Chuck9482912 Chuck Anderson
Norman, OK, USA   USA
One thing that I haven't seen mentioned is the weight of the pressure plate. I was lucky enough to have Tom's Imports lighten my flywheel for my BJ7 and I also had the machine shop modify the flywheel to accept a BJ8 pressure plate. Besides being a better pressure plate, it is also 3 1/2 pounds lighter.

Randy Forbes Avatar
Parrish, FL, USA   USA
1957 Austin-Healey 100-Six
1999 BMW M Coupe "Blue Car"
1999 BMW M Roadster "Black Car"
2001 BMW M Roadster "Gray Car"
In reply to # 207577 by Chuck9482912 One thing that I haven't seen mentioned is the weight of the pressure plate. I was lucky enough to have Tom's Imports lighten my flywheel for my BJ7 and I also had the machine shop modify the flywheel to accept a BJ8 pressure plate. Besides being a better pressure plate, it is also 3 1/2 pounds lighter.
Indeed, the BJ8 diaphragm spring clutch is lighter and the strongest clamping force of the three (3) stock clutches offered for the 6-cyls. However, you do have to drill new dowel pin holes when jumping clutch covers (or use the appropriate flywheels).

If you do a little digging, like I did when I fitted this cover back in the 80s, you can can get an uprated stock cover, like this one originally intended for a 365 GTB/4.




robcadle Rob Cadle
Redondo Beach, CA, USA   USA
I purchased my aluminum flywheel from DWR (photo attached). Weight is 10.4 lbs versus factory 28.2. This was a big contributor to me dropping over 100 lbs from my engine weight during rebuild.

I’ve heard a few people mention concerns about drivability if the flywheel is too light but I don’t think that’s going to be a problem (granted I don’t have the car running yet). I used to have a 2500 lb sport compact with a 2L engine and a 10 lb flywheel and startability wasn’t a problem. The Healey is a little lighter with a lot more low-end grunt so I think it will be fine.

Rob


Attachments:
3F31CAC3-79D9-416F-B05E-2289299F8D5B.jpeg    43.6 KB
3F31CAC3-79D9-416F-B05E-2289299F8D5B.jpeg

. Hide banner ads & support this website by becoming a > Gold Supporting Member <

To add your reply, or post your own questions




Registration is FREE and takes less than a minute!


Having trouble posting or changing forum settings?
Read the Forum Help (FAQ) or contact the webmaster





Join The Club

Sign in to ask questions, share photos, and access all website features

Your Cars

1962 Austin Healey 3000 BT7

Text Size

Larger Smaller
Reset Save

Sponsor Links