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10-28-2018, 06:45 AM | #21 |
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Re: Model A flywheeel lightened
My personal view on everything that has to do with a Model A is the more stock the better.
With the exception of oil and tires. Henry’s design has lasted 90 years. A stock, well maintained or correctly restored car, will out last all of us. Keep it simple stupid. Enjoy. |
10-28-2018, 07:18 AM | #22 | |
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Re: Model A flywheeel lightened
Quote:
I still would not fix any of my engines that way, or any one else's . |
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10-28-2018, 08:16 AM | #23 | |
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Re: Model A flywheeel lightened
Quote:
From what I have read of your previous posts you are concerned about a lack of momentum on cornering and having to change down gear. That sounds more like a symptom of a light fly wheel to me. At what weight that happens in a Model A I don't know. |
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10-29-2018, 12:22 AM | #24 | |
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Re: Model A flywheeel lightened
Quote:
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10-29-2018, 01:10 AM | #25 | |
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Re: Model A flywheeel lightened
Quote:
Herm. |
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10-29-2018, 01:26 AM | #26 | |
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Re: Model A flywheeel lightened
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Quote:
Herm. |
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10-29-2018, 09:12 AM | #27 |
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Re: Model A flywheeel lightened
Herm, If you're using that drawing that's around on the internet, like I am, then the bulk of the stock removed is on the outer radius of the flywheel. Both inside and outside. I don't know how to calculate the effect, but it's obvious that the more "meat" removed from the outer surface, the greater the effect. An analogy would be putting a pipe on a wrench to loosen a stuck bolt. I don't believe I've seen a 70 lb flywheel. Mine have all run around 63 Lb. And IO agree, a lighter flywheel is not a cause of vibration! I think if a Flywheel has a vibration because it was lightened, then someone forgot to balance it afterwards. Balancing it is critical for the life of the rear main. But if lightening flywheels was so detrimental, why did Henry (or Edsel) lighten the model B's to 50 lbs? And where were the reports of excessesive vibration?
Terry |
10-29-2018, 09:58 AM | #28 |
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Re: Model A flywheeel lightened
If you use the Secrets of Speed drawing posted on Internet be aware that there were two versions.
THe first one is wrong and has an incorrect dimension and will possibly create a dangerous and weakened flywheel. Last edited by Benson; 10-30-2018 at 08:37 AM. |
10-29-2018, 02:59 PM | #29 | |
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Re: Model A flywheeel lightened
Quote:
How about a little more info? I thought the Burlington crank sounded interesting. Were you racing or driving reasonably? Charlie Stephens |
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10-29-2018, 03:23 PM | #30 | |
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Re: Model A flywheeel lightened
Quote:
Charlie, this was discussed here on the forum several years ago. It has left a pretty bad taste in my mouth but the bottom line for me is that for a few hundred dollars more, I can purchase a US manufactured one that is constructed by a well-established and respected company that specializes in building quality crankshafts for motorsports applications, --or I can purchase one that is manufactured 100% by an off-shore company using 100% Chinese materials, and by one of many manufacturers who have pretty much proven they have poor Q/C standards & methods in manufacturing. If for no other reason, compare the warranties between the two manufacturers. One basically states they promise it will be built to Ford's original specifications however outside of that, there is no warranty. If the manufacturer has that much confidence (--or lack thereof) in their product where they will not stand behind it, what should that say to you or I as the consumer? . |
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10-29-2018, 05:39 PM | #31 |
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Re: Model A flywheeel lightened
I wish someone could answer that question. I have a "B" engine with counterweighted crankshaft that has been balanced as well as "A" flywheel and clutch that still shook really bad at a higher idle. A lightened flywheel with V8 clutch did not change anything. Please do not tell me this is a normal "A" vibration as Ford would not ship them in this condition and the public would have refused to buy them.
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10-29-2018, 07:55 PM | #32 | |
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Re: Model A flywheeel lightened
Quote:
Who is the "well-established and respected company that specializes in building quality crankshafts for motorsports applications"? Charlie Stephens |
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10-29-2018, 08:00 PM | #33 |
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Re: Model A flywheeel lightened
I guess I will find the image for you. Look at the drawing below. It should give you the closest answer I can give
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10-29-2018, 08:05 PM | #34 |
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Re: Model A flywheeel lightened
Like others have said the numbers in the red box have been corrected from original. And all measurements are from center of flywheel.
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10-29-2018, 09:01 PM | #35 |
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Re: Model A flywheeel lightened
When I was a kid of 15, I bought an engine from a guy who was changing to a Flathead V8. The engine Vibrated quite badly at anything above an idle.
The engine cost me $110.00. My Dad loaned me 25 dollars to help me buy it It was a B block with a Harmon & Collins cam, had adjustable lifters Bored to 4" Had a Counter balanced crank Had a Burns dual intake manifold with 2 97's Had 2 exhaust manifolds that were cut in front & welded to create dual exhaust Had a Winfield Aluminum head Had a B distributor Had a 12# Aluminum flywheel. The flywheel had a steel plate that was screwed to the aluminum flywheel. This was the cause of the vibration, as the threaded holes in the flywheel were badly worn. My Dad took the flywheel to work and had some steel inserts placed in the flywheel to correct the problem for me, and then had the flywheel re balanced with the pressure plate. As has been said by others, the only issue was low speed driveability with the light flywheel. Jim Last edited by Kahuna; 10-29-2018 at 09:06 PM. Reason: Sp |
10-29-2018, 10:17 PM | #36 |
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Re: Model A flywheeel lightened
Hmmmm. I thought I already posted this. My "B" engine has had the crankshaft with model "A" flywheel and pressure plate balanced but still shakes real bad at high idle. We tried a lightened flywheel and V8 clutch with no change. This is not a normal model "A vibration. Henry would not let the cars out of the factory like this nor would the public buy them.
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10-30-2018, 01:26 PM | #37 |
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Re: Model A flywheeel lightened
I hadn't thought of this before, but a high lobed cam will make a engine vibrate considerably, or so I 'm told. I have no experience with high lift/lobe cams so you'll have to discuss it with someone more knowlegeable.
Terry |
10-30-2018, 01:54 PM | #38 |
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Re: Model A flywheeel lightened
Guys,
A flywheel is an energy storage device. It basically damps out the power pulses as the respective cylinder fire. Less mass/moment of inertia results in less damping effect. Jim |
10-30-2018, 10:36 PM | #39 | |
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Re: Model A flywheeel lightened
Quote:
https://www.jalopyjournal.com/forum/...s-jpg.3308173/ Combined with this, the differences between A and B flywheels can be seen. http://www.fordgarage.com/pages/flywheels.htm |
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11-04-2018, 08:00 PM | #40 |
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Re: Model A flywheeel lightened
Terry, I have only known of (heard of) the flange on the back of the crankshaft shearing off 2 times. I have head my A since 1994. Out of what 5,000,000 A's I'd say odds are good that if you drive the car normally you will be ok.
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