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08-28-2014, 07:49 PM | #1 |
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Double Nut Lifters Secrets
I do not use them but they came loose on a members car eng installed, any secrets three wrenches, three hands etc. Thanks.
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08-28-2014, 08:32 PM | #2 |
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Re: Double Nut Lifters Secrets
Did the nuts come loose, or is the adjustment gap growing due to the cam lobe being worn away by too small a lifter face?
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08-28-2014, 10:17 PM | #3 |
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Re: Double Nut Lifters Secrets
Loose nuts, as far as we can tell with eng in car.
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08-28-2014, 10:25 PM | #4 |
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Re: Double Nut Lifters Secrets
A prehensile tail and 3 wrenches is the easiest way. Seriously though there is no fun way. When I did mine last spring I used two ground down wrenches and said a lot of bad words
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08-28-2014, 10:28 PM | #5 |
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Re: Double Nut Lifters Secrets
The secret is not to use them in the first place.
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08-29-2014, 01:24 AM | #6 |
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Re: Double Nut Lifters Secrets
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08-29-2014, 04:25 AM | #7 |
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Re: Double Nut Lifters Secrets
I use nothing but double locks. You really only need 2 wrenches but 3 can be handy. The 7/16 is the one that needs to be ground thin but sometimes the 1/2 needs it also. I simply tighten the lock slightly securely against the lifter and adjust. If you want to go up with the adjuster, hold the lock nut and turn the adjuster. If you want to go down, hold the lifter and turn the adjuster. Once you have the adjustment close, lock the nut securely and make the final adjustment to get them spot on. I can adjust a set in about 30 minutes from all being out of adjustment by .070 (new) or more.
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08-29-2014, 02:00 PM | #8 |
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Re: Double Nut Lifters Secrets
IF YOU HAVE A CAM designed to run on a one inch diameter lifter and they are properly tightened, THEY WILL NEVER COME LOOSE..
Like JR says, you only need two wrenches to adjust them. |
08-29-2014, 07:40 PM | #9 |
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Re: Double Nut Lifters Secrets
Got it Finished with two wrenches About half hour. Thanks All!
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08-30-2014, 09:22 PM | #10 | |
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Re: Double Nut Lifters Secrets
Quote:
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08-30-2014, 11:47 PM | #11 |
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Re: Double Nut Lifters Secrets
"most cams need a 1.1 dia foot because of how the flank is designed? "
Only your's Bill. I would venture to say most cam grinders that are regrinding model A cams (and there are plenty) are using Isky or Winfield type grinds and those were designed for a one inch lifter. |
08-31-2014, 02:49 AM | #12 |
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Re: Double Nut Lifters Secrets
It is not "only" Bill Stipe grinds that require more that a 1" lifter foot. Pete's statement is too broad about what "most cam grinders" are doing and I would want to see the camshaft data specific to the grind before selecting a lifter. Pete's statement provides no information as to any specific cam, or what Isky or Winfield did for any specific grind or what they did in general for A cams.
Get the specific specs from anyone who sells you what purports to be a "Winfield" or any other grind. It probably is not a "Winfield" grind, whatever that is, but even then get it in writing. Let me tell you about my hot "Winfield" grind and 1" lifters that wiped out the lobes. I would "venture to say" that most A-B cams need at least a 1.1" or more lifter foot. Stock certainly does. Check Vince Falters Fordgarage for data and pics. http://www.fordgarage.com/pages/valv...comparison.htm I do not know what "most" regrinders do, but doubt that "most" change the flank acceleration or velocity curves enough to accommodate 1" lifters for an A. One inch lifters was for a V8 grind. The V8 flank curves can and are being done for A cams today, but the best thing is to check with the cam grinder for their curves and lifter base recommendations. Ask the grinder if he knows the velocity formula for flanks and lifter bases. If he give you a blank stare go somewhere else. Last edited by PC/SR; 08-31-2014 at 02:55 AM. |
08-31-2014, 06:55 AM | #13 |
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Re: Double Nut Lifters Secrets
I guess my statement was misleading. I only use the double locks because the grinder has approved them. When I do a motor with a Stipe cam or other that I don't know where it came from, I give the customer the choice or just make the judgement call and use single lock, even though I don't trust them to stay adjusted.
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08-31-2014, 01:50 PM | #14 |
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Re: Double Nut Lifters Secrets
", or what Isky or Winfield did for any specific grind or what they did in general for A cams."
I will make another broad statement. Other than Bill's grinds, most of the ones available were COPIED from flathead V8 cams. Hence one inch lifters. The V8 grinds work far better than anything that came out of the 20's. As far as the math for any given cam, who cares? The guy that builds competition engines does and he will fully understand it. The average rebuild will get the cam the customer or the engine builder thinks will work for the particular application and their choice will usually be based on word of mouth or personal experience, not sheets of data. |
08-31-2014, 02:15 PM | #15 |
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Re: Double Nut Lifters Secrets
Doesn't anyone re-do these engines with original lifters any more ? I didn't/don't mean to hi-jack this thread.
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08-31-2014, 07:45 PM | #16 | |
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Re: Double Nut Lifters Secrets
Quote:
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08-31-2014, 09:39 PM | #17 | |
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Re: Double Nut Lifters Secrets
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Drain your water, it is going to freeze again tonight. Darryl in Fairbanks Last edited by darrylkmc; 08-31-2014 at 09:48 PM. |
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11-23-2020, 11:44 AM | #18 |
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Re: Double Nut Lifters Secrets
Ok, I’ve read the other comments but still lost. I’m attempting to set the double nut lifters on my ‘28 RPU. I guess I don’t understand how they work and don’t have one to look at. Please, step by step instructions. Does the flat on the lifter need held when tightening the lock nut? Does the Tappet need held when tightening the lock nut? HELP PLEASE!
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11-23-2020, 12:09 PM | #19 |
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Re: Double Nut Lifters Secrets
Originally Posted by Tom Wesenberg View Post
Did the nuts come loose, or is the adjustment gap growing due to the cam lobe being worn away by too small a lifter face? I doubt a worn cam would change the clearance much, if any. The nose would be the most apt to wear as the heel barely, or doesn't contact the lifter, and that's where the clearance would change. |
11-23-2020, 04:51 PM | #20 | |
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Re: Double Nut Lifters Secrets
Quote:
George, welcome to Fordbarn. I think I may have a set at the shop that I can send you a picture of that shows the difference. You must measure your lash at the base of the cam lobe however to make the adjustment, the tappet (i.e.: lifter) must be at TDC on the lobe so you can access the two hexagonal pieces (adjuster & jamb) |
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11-25-2020, 02:26 PM | #21 |
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Re: Double Nut Lifters Secrets
The lifters have a flat on both sides that keeps them from rotating. A really thin wrench is needed to hold it. A 17/32” open wrench is needed. Those are unavailable so use an old 1/2” open and Dremel it open to 17/32”. The head must be ground down very thin, also.
1/10th of a turn is about .001”. The lock nut has to be almost tight against the top of the lifter and the gap is set a little tight. Then when the lock nut is tightened, the gap will be reset perfect. A little trial and error will determine where to start the gap. Otherwise, it takes 3 wrenches and 3 hands. None of the You Tube videos show this lifter, which is the best and most difficult to adjust. The lifters can be set without removing the head by using the Distributor Rotor set half way between the terminal posts. A helper can hit the starter and get the Rotor close and you can make it perfect using a crank or socket on the crank nut. I bought a set of cheap Harbor Freight wrenches so I can grind one really thin to use on the Lifter. |
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