Need Photo of Crank Counterweight

[Jack Shaft]

[email protected] email murray, good man to do business with..no website that I know of.Quality part,fair price..does it reduce the vibration you feel driving? some.But the benefit of crankshaft/bearing protection is real.

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My model B motor has full circle weights added on but I still get a small vibration it mid throttleD763BE61-C04F-445C-913A-1E74A1755A9E.jpeg

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I have a model B engine which full circle balance weights have been added but I think one of them could have moved I have a slight vibration

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I have a model B engine with for full circle weights on the crank but it still has a small vibration I wonder if they can move

[J Franklin]

Maybe, X3. A four cyl. engine will always have some vibration if not equipped with a Lanchester type balancer.

[Synchro909]

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For a while now, I've been mulling the idea of grafting a counterweighted B crankshaft into an A block. I'd be very surprised if it hasn't already been done. My idea is to use B con rods and bore the block to accept the larger B crank journals. Now that I have seen a Burtz block, one of the problems that had me stumped is solved. We never saw any of the cars (GM) that used the bearings Terry used in his engine so I didn't think that way. I think that by the time I clean up the main bearing journals, they will be 0.020" undersize. I expect the bearings Terry used would be available over there in that size so they would take care of the mains. Bearing inserts for the big ends are available from the vendors and although they are not as good as say, Clevite inserts, I have never had a problem with any rod bearing. The biggest unknown is the main bearing caps. Will caps from a B engine fit or will I have to make new ones? Model A caps will not do, I think.
I know that is close to highjacking this thread but it all ties into vibration. I have a diamond B engine in one of my cars and I am quite happy with the smoothness of it.
BTW, B engines are uncommon over here so finding a decent B block is not an option but I have the crank.
Comments/suggestions?

[nkaminar]

Actually there is a way to completely balance a 4 cylinder inline engine but it is not very practical. It does not involve adding additional shafts. There is a way to make the center of mass of the pistons, pin, rings, and rod all at the big end of the crank. I have never seen this done and believe it is an original idea of mine. Can anyone guess what it is?

[Gene F]

Bob, my advice is to be careful! I have even had a crank done at one of the big name Model-A specialty rebuilders shop, and it turned out not to be right, and the thing snapped with not very many miles on it.

I have had 3 crankshafts done now, and if I were to need another today I would strongly consider the Scat. If you are like me, and drive your car, there is nothing like piece of mind. Saving a few bucks is not any saving while you are awaiting the tow truck on the side of the road.

[Gene F]

I heard years ago there was a guy in Westerville, OH named Dan Price, and he had developed counterweights that were fluid filled. I hear that was the most smooth engine....

[johnneilson]

Originally Posted by Synchro909

For a while now, I've been mulling the idea of grafting a counterweighted B crankshaft into an A block. I'd be very surprised if it hasn't already been done. My idea is to use B con rods and bore the block to accept the larger B crank journals. Now that I have seen a Burtz block, one of the problems that had me stumped is solved. We never saw any of the cars (GM) that used the bearings Terry used in his engine so I didn't think that way. I think that by the time I clean up the main bearing journals, they will be 0.020" undersize. I expect the bearings Terry used would be available over there in that size so they would take care of the mains. Bearing inserts for the big ends are available from the vendors and although they are not as good as say, Clevite inserts, I have never had a problem with any rod bearing. The biggest unknown is the main bearing caps. Will caps from a B engine fit or will I have to make new ones? Model A caps will not do, I think.
I know that is close to highjacking this thread but it all ties into vibration. I have a diamond B engine in one of my cars and I am quite happy with the smoothness of it.
BTW, B engines are uncommon over here so finding a decent B block is not an option but I have the crank.
Comments/suggestions?

Been done many times, several ways to accomplish.
The biggest no no is to reduce crank to "A" dimensions, seen that done.
Second biggest is to reduce/shoulder the main bolts to clear the crank. still a no no.
IMHO, it is not worth doing, especially with the Burtz motor now available.
FWIW, I have an "A" block with "C" crank in coupe. It works well, full pressure, inserts and the crank is reduced some, main bolts not cut. Just a ton of work to get right.

John

[Synchro909]

Originally Posted by johnneilson

Been done many times, several ways to accomplish.
The biggest no no is to reduce crank to "A" dimensions, seen that done.
Second biggest is to reduce/shoulder the main bolts to clear the crank. still a no no.
IMHO, it is not worth doing, especially with the Burtz motor now available.
FWIW, I have an "A" block with "C" crank in coupe. It works well, full pressure, inserts and the crank is reduced some, main bolts not cut. Just a ton of work to get right.

John

That goes without saying and you're right about the Burtz engine changing the game.

[1928Mustang]

The smoothest running model A I have is one that does not have counter weights. I crossed the country last July in my victoria. It has a counter weighted crank. Vibrated all the way across the USA. Wish I had used my other engine.

[nkaminar]

John mentioned the Burtz block and crank. Here is mine. A project in progress.

[Bob Bidonde]

The harmonic balance pulley dampens impulse torques in the crankshaft that result from explosive combustion.

[nkaminar]

Bob, the harmonic dampener is designed for a specific crankshaft and pistons, etc. I am wondering if a different dampener should be used on my Burtz engine. The crank is much stiffer but has more counter weight mass. It weighs 90 pounds.

[Gene F]

That Burtz unit does look beefy!

[Gene F]

Nkamanar, about how much with all the goodies are you expecting to have wrapped up in that when you are done? I had a lot more invested in my 1928 engine/block tn\han what people think. At the time, the Burtz was not ready.