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Cams - What do I have? #424221 03/14/12 7:04 pm
Joined: Sep 2006
Posts: 144
LJ. Offline OP
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Hi fellas!

I've just picked up some cams on eBay for my 1953 B33, and hoping that they are Goldie Touring cams... However, I have my doubts as they have no part numbers and I understood that all Goldie cams have this factory number. These could be repro? I'm not sure. Best I can do is to let you have the measurements of the 'lobe' and this is 31.52mm / 1,241 inch. What do I have? (keeping my fingers crossed that they are not standards)


LJ.
*******
1940 BSA M20 500cc Girder/Rigid- In Bits!
1947 BSA M21 600cc Girder/Rigid-Green
1949 BSA A7 500cc Girder/Plunger Star Twin-Black
1953 BSA B33 500cc Teles/Plunger-Maroon
1961 BSA A10 650cc Golden Flash-Blue
1961 BSA A10 650cc Golden Flash-Red
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Re: Cams - What do I have? [Re: LJ.] #424226 03/14/12 7:57 pm
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Gordo in Comox Online Content
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The standard B33 65-2420 cams have no numbers, a limited amount of lift (0.300 inches) and a very pointed profile. All the rest have much more lift and a much longer duration.

On the left below in both photos is the 65-2420. On the right is the 65-2442 (lift 0.442 inches).

Gordo

[Linked Image]

[Linked Image]


The roadside repairs make for the best post ride stories.
Re: Cams - What do I have? [Re: LJ.] #424247 03/14/12 9:52 pm
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LJ. Offline OP
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Thanks Gordo...

I re-remeasured my cam and assume you took your measurements in the same way as I have. Any idea what the stamped mark 'D' would indicate?

[Linked Image]


LJ.
*******
1940 BSA M20 500cc Girder/Rigid- In Bits!
1947 BSA M21 600cc Girder/Rigid-Green
1949 BSA A7 500cc Girder/Plunger Star Twin-Black
1953 BSA B33 500cc Teles/Plunger-Maroon
1961 BSA A10 650cc Golden Flash-Blue
1961 BSA A10 650cc Golden Flash-Red
Re: Cams - What do I have? [Re: LJ.] #424253 03/14/12 10:19 pm
Joined: Sep 2001
Posts: 3,055
Gordo in Comox Online Content
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For lift I subtract the similar measurement taken on the opposite side (cam heel?)as that is where the lifter starts from when it opens the valve (plus or minus the gap I suppose to be exact). Your cam could end up down around 0.300 if the heel measurement is similar to the ones I have. The D I do not know.

Using your method the 65-2442 cam measures about 0.570 in that position but it only lifts 0.442 inches.

Gordo

PS; I deleted my post about the unmarked high lift cam as on rechecking I found I had misread one of the measurements.

Last edited by Gordo in Comox; 03/15/12 4:30 am.

The roadside repairs make for the best post ride stories.

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