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I saw one of these aluminum cylinders for 8-stud pre-unit 650 Triumphs on eBay.

Can anyone tell me in what year were these first offered by Wellworthy?

Also, when was the tachometer drive in the timing cover first available on pre-unit Triumphs?

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“Also, when was the tachometer drive in the timing cover first available on pre-unit Triumphs?”

I believe the tacho was offered as a racing option for many years for the dynamo engines, simply as a tacho drive that replaced the dynamo.

When the sporting 650’s adopted the alternator (something like 1959) “The Bonneville” it needed the tacho drive from the timing cover/exhaust cam.

That’s my best guess.

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The racing tach that mounts where the generator drive is was first used on the GP Triumph as early as '47. Not sure how early the timing cover drive became available but the Race kit offered in 1951 contained an angle drive similar to the one used on the GP that replaced the generator so if you wanted a tach on your street bike sometime close to the race kit offered the timing cover drive was offered. That cover had the "nose" at the front to cover the gen drive area of the engine case. When Triumph went to alternator for all models in the '60 model year the "nose" part of the cover was removed to fit the engine case. So to summarize, the generator engines had a tach drive timing cover available around '51 to '52.

As far as the Wellworthy alloy barrel I believe that was an item offered for the TR6 so it probably had to be after '56.


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Originally Posted by Irish Swede
Also, when was the tachometer drive in the timing cover first available on pre-unit Triumphs?

The E3677 tach drive timing cover was introduced for the 1957 model year TR6A's as standard but could be special ordered or fitted to the other generator case models. It is listed in the parts books as CP. 162.


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
1971 BSA A65 650 - Project
1972 Norton Commando 750 "Combat"


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Thanks for that information, Jon.
I know the tachometer drive timing cover was listed in the 1958 TRI-COR catalog, but I wondered if it had appeared earlier.

As for the ALFIN cylinder barrel for 650cc Triumphs: As 650cc Triumphs originated with the 1950 Thunderbird, maybe that piece
was available earlier than 1956? The first TR6 bikes appeared in '56.

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The '56 TR5R came with the timing cover tach drive and dual gauges.



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Originally Posted by Boomer
The '56 TR5R came with the timing cover tach drive and dual gauges.
Bill B...


Bill,

Although there are many examples of restored 1956 TR5R's on the internet with tach drive timing cover and dual gauges, I can find no evidence that they were originally fitted with the E3677 tachometer drive timing cover and RC109 tachometer for the 1956 model year. Every publication that I have at my disposal supports this. I believe that any 1956 TR5R with the E3677 timing cover is a retrofit.

Sources:

The Triumph Trophy Bible by Harry Woolridge
Triumph Motorcycle Restoration Guide Bonneville &TR6 1956-1983 by David Gaylin
Triumph Motorcycles in America by Lindsay Brooke and David Gaylin
1956 Triumph Factory Parts Book by Triumph
Show and Go Cycle Shop http://showandgo.blogspot.com/2009/11/1957-triumph-tr5a-1956-tr5r.html

[Linked Image from 2.bp.blogspot.com]

[Linked Image from 2.bp.blogspot.com]


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1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
1971 BSA A65 650 - Project
1972 Norton Commando 750 "Combat"


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Well John, I didn't need to do an internet search to look for pictures, just recalled a couple of friends that owned original unrestored '56 TR5R's that had the timing cover tach drive, Jonnie Green, Jaye Straight, and Keith Martin.


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Originally Posted by Boomer
Well John, I didn't need to do an internet search to look for pictures, just recalled a couple of friends that owned original unrestored '56 TR5R's that had the timing cover tach drive, Jonnie Green, Jaye Straight, and Keith Martin.


Unfortunately, they weren't the original purchasers of those machines. Unless anyone has an invoice from 1956 showing the E3677 timing cover on it, pictures from 1956 of said machines with said timing cover to prove it, then it's all speculation 67 years later.


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
1971 BSA A65 650 - Project
1972 Norton Commando 750 "Combat"


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Originally Posted by Jon W. Whitley
Unfortunately, they weren't the original purchasers of those machines. Unless anyone has an invoice from 1956 showing the E3677 timing cover on it, pictures from 1956 of said machines with said timing cover to prove it, then it's all speculation 67 years later.


No they weren't, but at least two were bought from the original owner as is.


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Originally Posted by Boomer
No they weren't, but at least two were bought from the original owner as is.


Even so, who's to say the original owners didn't retrofit the E3677 tach drive timing covers? It would have been the only way to do so and run a generator in place of the speed kit tach drive unit.


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
1971 BSA A65 650 - Project
1972 Norton Commando 750 "Combat"


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Well, I guess the original question about year of origin for the Wellworthy Alfin barrels will have to remain unanswered for now.

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[Linked Image from i.postimg.cc]


Unfortunately no year noted but speculation is this was available when the TR6 came with an alloy head, so '56. Funny it says for Thunderbird which had an iron head early. Don't think I would put an iron head on an alloy barrel.


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Last edited by Boomer; 10/19/20 4:43 am.

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I saw a damaged one of these at a cycle swap meet a few years ago.

The "bonding process" referred to is a series of ridges machined on the outside of the steel cylinder liners, to which the aluminum is cast around.
In other words, the steel liners are not "pressed in," but are CAST in.

The problem is: if you don't know this, and attempt to press the old liners out, you wreck the whole thing.

And that is the damage that I saw.
Most of the aluminum side of one was destroyed and the ridges of the steel liner were plainly visible.

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When it says "Thunderbird," I suspect it was available before 1956, or Wellworthy didn't see the aluminum 650 heads coming.
I can see it popular with T110 models, though.

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Was it '60 when the Thunderbird 6T got the alloy head? I'm sure this barrel was available prior to that though.


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Originally Posted by Boomer
Don't think I would put an iron head on an alloy barrel.


Bill B...

Some people probably would, when only iron 650 heads existed and alloy barrels were for sale.


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Originally Posted by triton thrasher
Originally Posted by Boomer
Don't think I would put an iron head on an alloy barrel.


Bill B...

Some people probably would, when only iron 650 heads existed and alloy barrels were for sale.


Seems an oxymoron does it not?


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Fitting an alloy barrel will have the same effect (or lack of effect) with an iron head as with an alloy head.


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Boomer, the T-Birds got alloy heads beginning 1961.

My riding pal has an original, complete '60 "bathtub" one with the early '60 frame and the iron head.

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I am sure my 49 GP triumph had Alfin liners , but that was 40 years ago and my brain hurts now and then
baz


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