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Old 10-05-2015, 03:09 PM   #1
George Miller
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Default 5 main, chev, crankModel A engine

I know this is not for ever one, so don't look if you do not want to see a chev crank in a, A engine.

After a couple of years I'm back working on this engine. Today I started to make rods for this engine out of 7075 Alum. I made a wooden one first to make sure my math was right. If there is any interest I can post some pictures of making the rods along the way. This engine will be for my home built over head cylinder head.
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Old 10-05-2015, 03:21 PM   #2
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Default Re: 5 main, chev, crankModel A engine

Interest here

Pics please Mr Miller
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Old 10-05-2015, 03:24 PM   #3
Kohnke Rebabbitting
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Default Re: 5 main, chev, crankModel A engine

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Originally Posted by George Miller View Post
I know this is not for ever one, so don't look if you do not want to see a chev crank in a, A engine.

After a couple of years I'm back working on this engine. Today I started to make rods for this engine out of 7075 Alum. I made a wooden one first to make sure my math was right. If there is any interest I can post some pictures of making the rods along the way. This engine will be for my home built over head cylinder head.
Oh, Ya, George! PICTURES.

Herm.
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Old 10-05-2015, 03:29 PM   #4
George Miller
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Default Re: 5 main, chev, crankModel A engine

Ok I will take them after each operation. Also I will be using 283 Chev pistons.
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Old 10-05-2015, 03:30 PM   #5
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Default Re: 5 main, chev, crankModel A engine

George, Whittle away and lots of pictures please! Gary
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Old 10-05-2015, 04:08 PM   #6
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Default Re: 5 main, chev, crankModel A engine

Would love to see more about the crank installation also. Is that a timing chain that I see? That looks real interesting.
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Old 10-05-2015, 04:09 PM   #7
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Default Re: 5 main, chev, crankModel A engine

I'm watching, interesting
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Old 10-05-2015, 04:11 PM   #8
George Miller
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Default Re: 5 main, chev, crankModel A engine

Day one. The picture of putting in wrist pin holes. Also the wooden rod that I made to make sure my math was right. Also to make sure it cleared every thing in side the engine. The alum rods will be a little different in shape.
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Old 10-05-2015, 04:16 PM   #9
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Default Re: 5 main, chev, crankModel A engine

Please keep the pics coming. Are you building a racing motor for the salt flats???
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Old 10-05-2015, 04:25 PM   #10
George Miller
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Default Re: 5 main, chev, crankModel A engine

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Please keep the pics coming. Are you building a racing motor for the salt flats???
No Just wanted to do it. I wanted to use it with the cylinder head that I made a few years back.
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Old 10-05-2015, 04:27 PM   #11
George Miller
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Default Re: 5 main, chev, crankModel A engine

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Would love to see more about the crank installation also. Is that a timing chain that I see? That looks real interesting.
Yes. I will see if I have any pictures of when the crank was put in.
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Old 10-05-2015, 04:58 PM   #12
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Default Re: 5 main, chev, crankModel A engine

Thanks for this post Mr. Miller. How about some specs on the crankshaft. Been trying for some time to find one like this. Never thought to look at chev as the source.
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Old 10-05-2015, 05:21 PM   #13
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Default Re: 5 main, chev, crankModel A engine

NIce! Never seen anybody whittle a rod out of barstock. Good Luck
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Old 10-05-2015, 05:41 PM   #14
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Default Re: 5 main, chev, crankModel A engine

Im most curious how you handled the cam lobe timing.
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Old 10-05-2015, 06:04 PM   #15
George Miller
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Default Re: 5 main, chev, crankModel A engine

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Im most curious how you handled the cam lobe timing.
Used the chev cam that went with the crank.
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Old 10-05-2015, 06:14 PM   #16
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Default Re: 5 main, chev, crankModel A engine

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Used the chev cam that went with the crank.
What is the source of the Chev crank and cam? Are they early or are they from the 153 cid overhead? Didn't Chevrolet transition from four to six cylinder in 1927 or 28? Very interesting project!!
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Old 10-05-2015, 06:51 PM   #17
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Default Re: 5 main, chev, crankModel A engine

It looks like the center lines of #2 and #3 journals may be offset from the bores? I'm curious how you will handle that. Ron W
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Old 10-05-2015, 06:58 PM   #18
George Miller
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Default Re: 5 main, chev, crankModel A engine

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What is the source of the Chev crank and cam? Are they early or are they from the 153 cid overhead? Didn't Chevrolet transition from four to six cylinder in 1927 or 28? Very interesting project!!
They went to the 6 cylinder in 29. The crank is from a V8, so you can not use the A cam, because the A is a flat crank. The chev is 90 degree crank. The valve timing would be wrong.

The 153 crank would be great, but it is to short for the A block. The A block is wide between 2,3 cylinders because of the dist. going through the head and into the block.
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Old 10-05-2015, 07:30 PM   #19
AL in NY
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Default Re: 5 main, chev, crankModel A engine

George, I don't think you can get a "smooth" firing order using the V8 90 degree crank. Depending on how you set up the valve timing, a 720 degree firing cycle would go 180-90-180-270 or 180-270-180-90. You can't get 180 degrees of crankshaft rotation between each of the 4 cylinders in the firing cycle. Seems to me the engine would run ruff.
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Old 10-05-2015, 07:46 PM   #20
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Default Re: 5 main, chev, crankModel A engine

Yep, as Al said..........I wonder if it will sound like a pair of John Deere tractors running together?

It will be interesting..........as well as a lot of work. What is the stroke?
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