02-27-2017, 07:17 AM | #1 |
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Location: Little Falls NY
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B Camshaft
Hello I have a B cam in excellent condition that I would like to use in my model A engine. I also have new single lock tappets that measure 1.120" at the base. Are these compatible or do I need to find tappets with a larger bace? Thank you
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02-27-2017, 09:31 AM | #3 |
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Re: B Camshaft
Ok wow that sums it up. Does anyone make the 1.187" tappets preferably adjustable?
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02-27-2017, 10:07 AM | #4 |
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Re: B Camshaft
I have been using adjustable tappets from Snyder's with no problems. Be sure and check the diameter of the cam center bearing and also the bearing journal in the block. Any wear more than 0.005" "slop" may create a tap-tap noise. Not good! Most camshafts are worn, best to buy a new one.
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02-27-2017, 12:29 PM | #5 |
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Re: B Camshaft
1.120" will work fine with the A or B cam. FYI, there were 3 different B cams produced. Most had .302" cam lift. A few had .315" cam lift and some .339". The last was the best performer, but all were an improvement over the A cam.
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02-27-2017, 02:01 PM | #6 |
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Re: B Camshaft
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02-27-2017, 02:09 PM | #7 |
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Re: B Camshaft
The B cam I have is like new with right size bearing diameters haven't measured the lift, did not know there were three different B cam's. I have nothing against a new one but the one I have dosnt need replacing
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08-11-2017, 04:16 PM | #8 |
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Re: B Camshaft
If a used "B" cam has a little rust pitting on the journals, will it necessarily have to be turned down by a machinist? Extra slop (over. 005) would causes tapping or knocking someone wrote. Would a minor amount of rust pitting on the cam journals would be enough reason to reject spending $50 for a used "B" cam? Yes, a Stipe 330 cam would be great, but how much do they cost in comparison to a $50 used cam?
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08-11-2017, 04:36 PM | #9 |
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Re: B Camshaft
I have often wondered what can be done about the cam bearings in the block. If you turn down the journal on the cam to that the slop is unacceptable how do you bush the block? Also how do you measure the cam bearing surfaces in the block? Does the cast iron not wear for some reason? Jack
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08-11-2017, 04:46 PM | #10 | |
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Re: B Camshaft
Quote:
A machinist who knows and has proper equipment can use bronze bushings in the stock (worn) block bearing areas(3). After the bushings are pressed in, they must be reamed to fit whatever the cam specs are. The block is measured with inside caliper / mike. I do not think that this is a job for amateur, but wouldn't be surprised if someone has done this job. I only knew J Steele to have offered this service. Sure the cast iron wears. Compensated for by building up cam bearings or bushing blk as said. Oh, and if you buy a Donovan alum 4 cyl block, they used chev 350 cam bushings for that purpose, I've been informed. Last edited by hardtimes; 08-11-2017 at 04:49 PM. Reason: ............ |
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08-11-2017, 05:04 PM | #11 |
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Re: B Camshaft
Hardtimes; thanks, it is nice to get replies. Other makes that I have do not reply with the technical information on their site like this one does. Again, thanks. Jack
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08-11-2017, 05:40 PM | #12 | |
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Re: B Camshaft
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08-11-2017, 05:55 PM | #13 | |
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Re: B Camshaft
Quote:
A while ago, I had an A crankshaft that had standard journals but had been sitting for years, so long that there was a line of corrosion where the main bearing cap met the block. After asking around, I decided to leave it for the reason I have outlined above.
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08-11-2017, 06:23 PM | #14 |
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Re: B Camshaft
How does one tell the difference between A and B distributors?
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08-11-2017, 06:54 PM | #15 |
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Re: B Camshaft
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08-11-2017, 07:17 PM | #16 |
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Re: B Camshaft
Here is a "B" distributor I just installed. No arm for retard advance rod to mount to. Small lock screw on carb side to adjust and set advance. Plus centrifugal weights.
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08-12-2017, 09:15 AM | #17 | |
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Re: B Camshaft
Quote:
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08-12-2017, 09:28 AM | #18 |
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Re: B Camshaft
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08-12-2017, 10:38 AM | #19 |
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Re: B Camshaft
A little rust won't hurt, don't use if deeply pitted.
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