Engine valve woes

Information relating to the Matchless G85 500cc Heavyweight, AJS 7R, Matchless G45 and Matchless G50
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Engine valve woes

Postby mdt-son » Fri Oct 23, 2020 12:54 pm

Hi all,

I am trying to assemble a table of valve and valve guide data used on the shortstroke G80CS. I need your help to fill in the blanks!

1956 INL 013988 (Alpha V55, Tranco 4350-I) Head Ø 1-11/16" (1.6875") Stem Ø 0.3730" Length 4.060" Guide 017019 (Alpha G425, Tranco G6436)
EXH 013989 (Alpha V56, Tranco 4350-E) Head Ø 1-11/16" (1.6875") Stem Ø 0.3730" Length 4.060" Guide 022208 (Alpha G485, Tranco G6496)

1957/58 INL 023368 (Alpha ??, Tranco ????) Head Ø 1-7/8" (1.875") Stem Ø 0.3730" Length ?? Guide 017019 (Alpha G425, Tranco G6436)
EXH 023369 (Alpha ??, Tranco 4350-E core ) Head Ø 1-11/16" (1.6875") Stem Ø 0.3730" Length ?? Guide 023370 (Tranco G6497)

1959 INL 024518 (Alpha ??, Tranco 4509) Head Ø ?? Stem Ø ?? Length ?? Guide 024359 (Tranco G6516)
EXH 023369 (Alpha ??, Tranco 4350-E core) Head Ø 1-11/16" (1.6875") Stem Ø 0.3725" Length ?? Guide 024519 (Alpha G506, Tranco G6517)

1960-67 INL 026028 (Alpha V208, Tranco 4513) Head Ø 1-3/4" (1.75") Stem Ø 0.312" Length 4.185" Guide 026030 (Alpha G515, Tranco G6526)
EXH 026029 (Alpha V209, Tranco 4514) Head Ø 1-9/16" (1.565") Stem Ø 0.3725" Length 4.150" Guide 024519 (Alpha G506, Tranco G6517)

All Alpha Vxxx and Gxxx codes are successions of corresponding Hepolite codes.

I am surprised by all these variations over the years. Obviosly the factory carried out a continuous development, no doubt with input from Cooper Motors.
Further info and corrections received with thanks.

-Knut
Last edited by mdt-son on Thu Nov 12, 2020 6:21 pm, edited 4 times in total.

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Re: Engine valve woes

Postby Rob Harknett » Fri Oct 23, 2020 4:08 pm


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Re: Engine valve woes

Postby mdt-son » Sat Oct 24, 2020 8:42 am

Thank you Rob. Unfortunately the data provided do not cover the G80CS shortstroke models.

I looked up G & S valves - no help there either.

Does someone own a copy of

TRANCO VALVES GUIDES SPRINGS CATALOGUE NUMBER 27

?

I believe Tranco was a supplier to the factory.

-Knut

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Re: Engine valve woes

Postby Rob Harknett » Sat Oct 24, 2020 1:07 pm

mdt-son wrote:Thank you Rob. Unfortunately the data provided do not cover the G80CS shortstroke models.

I looked up G & S valves - no help there either.

Does someone own a copy of

TRANCO VALVES GUIDES SPRINGS CATALOGUE NUMBER 27

?

I believe Tranco was a supplier to the factory.

-Knut

I do have a Tranco catalogue somewhere, don't know what issue number. I does cover 40's to 60's .
I only scanned a few pages of it and archived it here. http://archives.jampot.dk/technical/Gen ... etails.pdf

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Re: Engine valve woes

Postby mdt-son » Sun Oct 25, 2020 12:42 pm

Rob,

Sounds like you have the correct edition. If you could retrieve it and scan or photograph all postwar content related to marques, that would be really helpful.

Thanks in anticipation!

Meanwhile, I hope Ken de Groome and others will chime in.

Cheers,
Knut

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Re: Engine valve woes

Postby DickV » Fri Oct 30, 2020 11:58 pm

i have a cyli nder dead on my bench of 1966 g80 intake is 1 3/4 dia stem dia 310 mm ex is 1 9/16 dia stem dia 370 mm spec look same alpha 60 to67

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Re: Engine valve woes

Postby mdt-son » Sat Oct 31, 2020 4:15 am

Thanks DickV. Your measurement confirms my table entry for 1960-67. If you have a trace to supplier code for the exhaust valve, please let me know.
The catalogue entry with Alpha Bearings is faulty.

Cheers,
Knut

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Re: Engine valve woes

Postby Rob Harknett » Sat Oct 31, 2020 1:08 pm


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Re: Engine valve woes

Postby mdt-son » Sun Nov 01, 2020 2:30 pm

Thanks Rob. Have you looked inside? The last models presented are for the 1950 season, thus too old for my enquiry.
I am still looking for issue 27 of their catalogue (1969 edition).

-Knut

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Re: Engine valve woes

Postby Rob Harknett » Sun Nov 01, 2020 5:02 pm

Yes Knut, it is the 1950 edition and goes back to the 1920's. I thought you were compiling a list covering all era's. I know I have more books somewhere in crates. My ill health means I cannot lift the crates. I would even get breathless sorting through a crate of literature.

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