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Has anyone used the 911 Porsche swivel feet valve adjusters on an BSA a-65? If so did you have to cut them down? Pictures if you have them.

Thanks T.C.

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https://www.dropbox.com/s/fnhpjihea4664y2/P1000653.JPG?dl=0

Picture of the VW (Porsche?) ones I´m using in my Spitfire (bought from Rainer Traupel +49 4532260227). I cut them shorter and cut a slot in the end for adjustment with a screwdriver and also use aluminium nuts. The pushrods will of course also have to be shortened a little. I have had them in my engine for nearly 40 000km.. works excellent and no more pitting in the valve end. With the alu nut the weight is approx the same as the BSA ones and the cut off on the pushrod.


Arnstein

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I have used them but as Arnstein said you have to shorten the pushrods. You also need to rethread the rockers for the 8x1mm thread. I now make EF adjusters in the 5/16-24 thread for triples but they can be used on twins also. Minimum clearance from valve tip to rocker is 0.4". Before shortening the pushrods, check the geometry to see if the valve stem should be shortened.
[Linked Image]
Triple adjusting screw shown for reference.

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https://www.dropbox.com/s/h1l9njyivcyz1cl/P1000654.JPG?dl=0

I shortened the pushrods ca 3mm ( they differ a bit from new and so does the rockers ) and that will make the measurement from under the rocker to under the swivel approx 8.5mm ( holding the swivel square to the underside of the rocker ) when adjusted valve clearance ca 0.25mm exhaust.. the wear pattern under the EF showing evenly across.
DMadigan I do´nt understand what´s meanth measuring the minimum 0.4" (10mm) clearance, is this measured similar to my 8.5mm?


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Why not bevel the bottom of the rockers so the swivels will work and you will not have to shorten the push rods only the elephant foot stems? You will lose a few threads but I think you will be ok.

This method has been used by the xs650 group.

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Might be that this will loose too much material / threads using the VW ones which has a long unthreaded part of the stem. The Nice Madigan ones will probably be better.


Arnstein

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The A65 uses 5/16" x 26 tpi adjusters - they are BSCy - British Standard Cycle. Do you make these David?


BSA: '71 B175; '68 B25; '71 A65; '71 A75
Triumph: '87 T140; '72 T150v
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D-squared I just run an eight mm tap through the rockers works fine for my Porsche adjusters.

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Hi Tony. Yes, I did that on both Triples. Trouble is that the rockers are pretty hard and often it needs more than one 8x1 HSS tap to do all 6!

OK maybe 25.4tpi is closer to 26tpi than 24tpi, but it does mean that there is no going back.


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One of the go fast changes made to the T150 and T160's was to get rid of the swivel style tappet adjusters and go with Elephant Foot "Norman Hyde" solid tappet adjusters.
I'm puzzled why you'd go this way and not use these which are much lighter and an improvement on the stock adjusters. No need to mess with pushrods, no messing with the rocker arm threads. Seems to be excessive overkill using those swivel types to me unless you are expecting to be doing massive mileage!

https://www.classicbritishspares.com/collections/bsa-engine/products/mushroom-tappet-adjusters

Last edited by John Goodwin; 04/09/18 12:32 am.

Current: 2 x 1966 A65S, 1 x 1967 A65SA, 1 x 69/70? A65LA space Y, 1 X D14/4 & 1 x B175
Past: 4 x 1976 T160V, 1 74/5 T150V, 83 model GSX 750 ESD, Z650, Katana 1100(Bathurst Model), 79 T140V, 70's TR6, 2 x 1971 BSA 250 Gold Stars, 50's 350 Goldie, A65 Spitfire semi basket case, 1965/6? A65 LC, Tiger 21 350 & a D14/4 Bantam, 175 Bridgestone Twin with Zimmerman discs!
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I use the mushroom adjusters in my A65 they work well. I use lash caps on the valves. Because I have alloy cyls and C/molly pushrods I have to set it with zero clearance cold, and even then when the thing is hot the clearance probably gets a bit big, so the caps get hammered. The std adjusters dug holes in the caps but the mushroom heads do not. The swivel foot type look good.


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I only have the 5/16"-24 which work on the triples and T140. I do not know if the T120 changed over to UNF on the rockers.
8x1mm is closer to the 5/16-26 TPI and need very little material removed to fit the A65. The Porsche adjusters are somewhat expensive ~$35 each.
The reason for changing to EF adjusters over the others is a sphere has a single point contact which is why lash caps are needed with them. The EF adjusters have a ball/socket which has less wear and spreads the load over the top of the valve stem. The T160 adjusters are similar but with a smaller flat on the valve. When the T160 adjuster is loaded and slides across the valve, the edge of the flat will dig in more then the larger EF foot. Same effect as when lapping a flat part and drawing it back and forth rather than a circular motion.

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Hi. You're making these? How much for a set?
Thanx
Steve


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Steve, PM for a price list. Thanks.


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