04-01-2021, 01:51 PM | #1 |
Senior Member
Join Date: May 2010
Location: South California
Posts: 6,188
|
flywheel info
I have a '32 stock flywheel.
A machinist acquaintance said that he has never 'lightened' such equipment. Is there any posted info , like a diagram, etc, in writing...that I could give him as directions on 'how to lighten an A/B flywheel ? If so, could you please direct me to copy such for this machinist ! Thanks BTW..this B flywheel is 54 lbs stock with bearing and ring gear. |
04-01-2021, 02:29 PM | #2 | |
Senior Member
Join Date: Jan 2020
Location: SF Bay Area
Posts: 1,079
|
Re: flywheel info
Quote:
Not trying at all to start a discussion on whether you should do this. JayJay
__________________
JayJay San Francisco Bay Area ------------------------ 1930 Murray Town Sedan 1931 Briggs S/W Town Sedan |
|
Sponsored Links (Register now to hide all advertisements) |
|
04-01-2021, 02:40 PM | #3 |
Senior Member
Join Date: Jun 2010
Location: Highland, CA
Posts: 207
|
Re: flywheel info
I just did one a couple of weeks ago.
|
04-01-2021, 06:06 PM | #4 |
Senior Member
Join Date: May 2010
Location: South California
Posts: 6,188
|
Re: flywheel info
|
04-01-2021, 06:09 PM | #5 |
Senior Member
Join Date: May 2010
Location: South California
Posts: 6,188
|
Re: flywheel info
|
04-01-2021, 08:32 PM | #6 |
Senior Member
Join Date: May 2010
Location: Southern California
Posts: 7,033
|
Re: flywheel info
Sponsored Links (Register now to hide all advertisements)
Charlie Stephens |
04-01-2021, 10:28 PM | #7 |
Senior Member
Join Date: Apr 2011
Location: Wimauma, Florida
Posts: 121
|
Re: flywheel info
BING / GOOGLE a local Model A club near you to find a machine shop also near you that has expertise with the process. Much quicker acceleration, less stress and wear on main bearings, and shifting is smoother, particularly when having to 'double-clutch'. Some say that they then did not have to D-C. I also found an increase in mph.
|
04-01-2021, 11:24 PM | #8 | |
Senior Member
Join Date: May 2010
Posts: 2,599
|
Re: flywheel info
Quote:
Yes there are two versions 1. The first was published in S.O.S.S magazine (as I remember) and has an error. 2. The second one issued shortly after the first corrected the error. |
|
04-02-2021, 01:22 AM | #9 | |
Senior Member
Join Date: May 2010
Location: South California
Posts: 6,188
|
Re: flywheel info
Quote:
Thanks for your info/help. Yeah confusing info is costly too Anyone have access to second version ‘ how to ‘ ? |
|
04-02-2021, 05:39 AM | #10 |
Senior Member
Join Date: May 2010
Location: Eastern Tennessee
Posts: 11,520
|
Re: flywheel info
I do, but I'm going to suggest you convert the flywheel to accept the V8 style pressure plate and stop there. If anything else, just remove 0.050 off of the outside to clean it up. IMO, too light is worse than a little heavy.
|
04-02-2021, 07:51 AM | #11 |
Member
Join Date: Sep 2018
Posts: 88
|
Re: flywheel info
I concur with Brent. I have three cars with V-8 pressure plates. One has a 42 # flywheel, One has a stock Model A flywheel - 64#, and one has a V-8 flywheel - 54#. As faar as daily driving I can not tell the diference. The light one at 42# was built for my racer.
|
04-02-2021, 12:00 PM | #12 |
Senior Member
Join Date: Jun 2010
Location: Temecula, CA
Posts: 4,091
|
Re: flywheel info
Mine are all in the 30-35 lb. range. The last two I did, I had them drilled for a diaphragm clutch, very smooth!
|
04-02-2021, 07:04 PM | #13 |
Senior Member
Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,903
|
Re: flywheel info
You can buy a lightened clutch from Snyders for $475 with the V8 clutch. It is balanced and ready to go. Probably cheaper than having a machinist turn your flywheel, buying the clutch, and having the sum balanced. Also, less risk.
__________________
A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
04-03-2021, 02:49 AM | #14 | |
Senior Member
Join Date: May 2010
Location: South California
Posts: 6,188
|
Re: flywheel info
Quote:
Like you state, I have used several wts flywheels in several different B engines. I’ve driven stock A/B engines for long time. As Jim B, I’ve used 35 lb as lightest in 30 roadster. This one drove easiest and smoothest with V8 PP. I have one that is near running stage with a Stipe aluminum flywheel and V8 setup. This one will have ton of power, so light flywheel will do. The new Burtz flywheel is 30 lb and balanced to use with his engine. Im actually at a stage/crossroads where I need to make the flywheel lightening decision... on the B Im working. The stock poured bearings are a consideration here also, eh ! |
|
04-03-2021, 04:31 AM | #15 | |
Senior Member
Join Date: Feb 2015
Location: Australia
Posts: 1,971
|
Re: flywheel info
Quote:
https://www.jalopyjournal.com/forum/...wheel.1030778/ |
|
04-03-2021, 04:15 PM | #16 | |
Senior Member
Join Date: May 2010
Location: South California
Posts: 6,188
|
Re: flywheel info
Quote:
THAT is much better for my old eyes. Thanks. Now.....anyone can help if this IS THE GOOD DRAWING ? Also, is there a way you know of to copy this onto paper copy... to hand to a machinist ? |
|
07-28-2022, 07:43 AM | #17 |
Junior Member
Join Date: Aug 2012
Posts: 25
|
Re: flywheel info
Jim,
What diaphragm clutch did you use? Seems to be lots of debate related the the throwout bearing interface with the fingers. Also, whether to use 9" or 10" . Thanks in advance for your reply. Much easier to learn from someone that has done it. Richard |
07-28-2022, 10:14 AM | #18 |
Senior Member
Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,903
|
Re: flywheel info
This is a note on how a lightened flywheel works. It is not advice on whether to use it or not.
All crankshafts vibrate in torsion at all speeds. There is always a node point where there is no vibration with the torsion being ahead and behind that point. With the heavy stock flywheel the node point is right at the flywheel which means that no torsional vibration is felt at the flywheel. When the flywheel is lightened the node point moves forward so that now there is some vibration in the flywheel. You can feel this in the steering wheel when driving a car with a lightened flywheel. It smooths out at higher rpm. Even though there is no torsional vibration felt with the stock flywheel does not mean that the crankshaft is not vibrating in torsion. It is at all rpm's. It will vibrate more at a critical speed which is a higher rpm.
__________________
A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
07-28-2022, 11:03 AM | #19 |
Member
Join Date: Jul 2018
Posts: 49
|
Re: flywheel info
It's a Ranger, Mustang, Thunderbird pressure plate. It is a 9" diaphragm. The bolt pattern is unique and uses dowel pins to locate it. I used the Sachs SC0047. Bought it from Amazon. I used a disc from Speedway for the Camaro V8 T5 trans. This diaphragm clutch will not work with the stock trans. The fingers bind on the input sleeve when depressed (Personal experience). Here is a drawing of the bolt pattern. Also shows where I lightened it. I used Ford Racing M6397A302 Pressure Plate Bolt and Dowel Kit.
|
07-28-2022, 11:05 AM | #20 | |
Senior Member
Join Date: Jun 2010
Location: 34.22 N 118.36 W
Posts: 1,057
|
Re: flywheel info
Quote:
there are several ways to do it, have worked on a couple. there are a couple PP from Mustang and Ranger that will work. in order to do it correctly, the flywheel must be drilled with the proper pattern AND have the locating pins installed. the difference between the long finger and diaphragm is only a 1/16" on the bolt holes and just hogging out the holes is not the proper way to do it. John
__________________
As Carroll Smith wrote; All Failures are Human in Origin. |
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|