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06-18-2022, 04:12 AM | #21 | |
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Re: Who makes/sells the best adjustable tappets?
Quote:
When I install the camshaft, tappets etc. the valves sit 0.08" above the surface. How about the dimension of my tappets? Is 62.97 mm = 2.5“ length ok (when screwed all the way down)? Last edited by Manxnorton; 06-18-2022 at 04:23 AM. |
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06-18-2022, 04:18 AM | #22 | |
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Re: Who makes/sells the best adjustable tappets?
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I took over the car from my father about one year ago. He had it since the 1990s. I never heard that something was done with the camshaft. I can only guess that it is in original condition. If you could provide me with dimension I could double-check. Can you tell me the length of the Snyders tappets? If these are shorter than mine, this would definitively solve the issue. Last edited by Manxnorton; 06-18-2022 at 04:24 AM. |
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06-18-2022, 06:49 AM | #23 |
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Re: Who makes/sells the best adjustable tappets?
I cannot tell you the length of the tappets without taking my engine back apart. However you can email Snyders and ask them. They are very responsive and helpful. Try [email protected] and if she cannot help she will forward your email to someone who can help. One problem may be that they are temporally out of stock so you may have to wait for an answer.
One other thing to measure is the length of the valves. Some modern valves are from a modern engine and cut down to fit the Model A. You may want to ask Snyders what the length of their valve are and compare that to what you have.
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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. Last edited by nkaminar; 06-18-2022 at 06:54 AM. |
06-18-2022, 07:09 AM | #24 |
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Re: Who makes/sells the best adjustable tappets?
Thank you once more for your support.
I realized already that the tappets are not available at Snyders. Same situation with other shops. But I found somebody on Ebay (see attachment). I have sent him a question concernig the lenght. They are made by Colony and I hope they fit... |
06-18-2022, 07:19 AM | #25 |
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Re: Who makes/sells the best adjustable tappets?
I would be suspicious of those tappets.
I have a set of Colony single lock tappets purchased from Snyders and I just measured. They appear to be 2.285 fully closed. (Disclaimer: I did not fully close - I measured the length of the tappet 2.255 + thickness of the bolt head .030) What was the length of your old tappets for comparison with your new ones? |
06-18-2022, 07:20 AM | #26 | |
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Re: Who makes/sells the best adjustable tappets?
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06-18-2022, 08:10 AM | #27 |
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Re: Who makes/sells the best adjustable tappets?
I have a set of self locking tappets I got from Berts a couple of years ago.
As I remember they were Colony but not for sure. They are no longer in their packaging. I can check with Steve on Tuesday as to whether they might be Colony tappets. These measure 2.478 when "cranked" all the way down. BTW the heel diameter is 1.122 Last edited by Benson; 06-18-2022 at 04:33 PM. |
06-18-2022, 10:17 AM | #28 | |
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Re: Who makes/sells the best adjustable tappets?
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06-18-2022, 02:03 PM | #29 | |
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Re: Who makes/sells the best adjustable tappets?
Quote:
Mine are 2.5" long. If your bolt heads are actually 0.03" this leads to 2.285". That would be perfect. But if your bolt heads should be 0.3" this leads to 2.555. That is even longer than mine. |
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06-18-2022, 02:06 PM | #30 | |
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Re: Who makes/sells the best adjustable tappets?
Quote:
This length is almost the same as mine. That does not help. |
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06-18-2022, 02:08 PM | #31 |
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Re: Who makes/sells the best adjustable tappets?
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06-18-2022, 03:09 PM | #32 |
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Re: Who makes/sells the best adjustable tappets?
On the engine I am currently working on the tappets are 2.42, valves are 5.92 and base circle diameter of the camshaft is 0.85. As one might expect the valves vary a bit. The tappets are not all the way down. The cam was reground and I was surprised to find that the base circle varies too. The whole stackup length is about 8.76. If you have the same diameter base circle your total stackup would be 8.64. So it comes down to what is the diameter of your cam base circle?
My tappets are most of the way down. I am decking the block and will have to re cut the valve seats and grind the valves so I may be in the same boat and have to regrind the valve stems a bit.
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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. Last edited by nkaminar; 06-18-2022 at 03:23 PM. |
06-18-2022, 08:05 PM | #33 |
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Re: Who makes/sells the best adjustable tappets?
It seems I remember that the valves from the early GM 305 V6 could be used in the model A but it's been a while so I can't back that up. I would compare all the old stack up parts to the new to see whats different. Most like the double lock Colony tappets. A lot of stuff has been out of stock lately.
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06-19-2022, 05:03 AM | #34 |
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Re: Who makes/sells the best adjustable tappets?
I run into the same situation you are describing a few times each year. The very simple solution is to shorten the valve stems. Shorten them all to the minimum shortest length you need, in other words, don't shorten them more than you need to but keep them all the same length for ease of assembly.
Engine rebuilding shops will have the necessary equipment. The cut edge needs to be precise so don't try to grind them with your bench grinder. I have a Sunnen machine in my shop.... Good Day! |
06-19-2022, 05:06 AM | #35 | |
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Re: Who makes/sells the best adjustable tappets?
Quote:
Tappets: 2.48 Valves: 5.73 Base circle: 0.95 Total stackup: 8.69 As already mentioned there are about 0.08 to 0.1 which I need to gain. I think that is too much to grind it off the cams. Takes too much time and is too expensive. I think for me the best option is to have ground 0.1 off the valve stems. You do not see a problem with shortening the valve stems? There is enough hardness 0.1" below the surface? However, because of your information I see another option: Your tappets are not all the way down and they are 0.06 shorter than mine. With these tappets my issue would most likely be solved. Which tappet type are these? |
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06-19-2022, 05:08 AM | #36 | |
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Re: Who makes/sells the best adjustable tappets?
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Thank you. That is what I am most likely going to do. |
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06-19-2022, 05:14 AM | #37 | |
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Re: Who makes/sells the best adjustable tappets?
Quote:
Same with the tappets: Screwed all the way down they are a bit longer than the old ones. That finally means shortening the valve stems is the easiest way to solve the issue. Shorter tappets migth be nicer. But currently nothing seems to be available. And I would like to get my car back on the road asap. |
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06-19-2022, 05:49 AM | #38 |
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Re: Who makes/sells the best adjustable tappets?
All these parts came out of the engine I am rebuilding so I don't have any history or information on who make the parts. About a year ago I tried to contact the engine builder in California but got no response. It looks like the engine was rebuilt several years ago. I think your best bet is shortening the stems. I think I may have to do that too.
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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. |
06-19-2022, 11:00 AM | #39 |
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Re: Who makes/sells the best adjustable tappets?
Some folks indicate that the adjustable tappets of one type or another have difficulty in adjustment when the tappet is all the way down on the heel of the cam. Some have to turn the engine to get the tappet high enough out of the bore to be able to make an adjustment. It seems there is always a trade off when changing parts for a different design.
Special tools were used by rebuilders back in the day to be able to measure the needed valve stem dimension when using non adjustables. This way they could adjust the stem length once then reinstall the valve one time. The old tulip type valves and two piece guides were a PITA to adjust if a person didn't have those tools. I have a set for V8 types but not for the model A engine. I'd need a guide pilot to make mine work for an A or B engine. |
06-19-2022, 03:12 PM | #40 |
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Re: Who makes/sells the best adjustable tappets?
Could your valve seats been ground too deep?
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