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Re: B33 ID please
wadeschields #809119 05/16/20 5:14 pm
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Originally Posted by wadeschields
My tins are blue right now so If they are original .... I had not come to that conclusion yet... But I'll look closer .... Then blk as black and maybe "b" for blue??? Who knows ... I cant even read where mine was dispatched too.......



There were only two distributors in the US at that time, East coast; BSA US Nutley, and West coast; Hap Alzina. So I would conclude it went to Alzina. I don't believe blue was a color available, only red or black depending on model. So again I would conclude black.

As for the STD 2, the 2 denotes that needle roller bearings were used on both shafts as opposed to bushings.


Bill B...


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Re: B33 project
wadeschields #809140 05/16/20 10:01 pm
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Hi Wade / Boomer,

Quote
As for the STD 2, the 2 denotes that needle roller bearings were used on both shafts as opposed to bushings.

I do not believe this is so, The needle roller boxes have "T" to denote Torrington needle roller bearing fitment

STD2 is a wide ratio gearbox fitted to US market Super Rockets (based on that I have never seen one over here)

The BSA gearbox data is in this BB thread,, http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=15504

I do not know how this wide ratio gearbox would work out on a B33 ?? Peter Quick did not seem to like it ??

John

Last edited by chaterlea25; 05/16/20 10:01 pm.
Re: B33 project
chaterlea25 #809149 05/17/20 2:06 am
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Originally Posted by chaterlea25
Hi Wade / Boomer,

Quote
As for the STD 2, the 2 denotes that needle roller bearings were used on both shafts as opposed to bushings.


John


Okay, I was going by the difference between the RRT and RRT2 where the RRT has the rollers on one shaft and the RRT2 has rollers on both shafts.


Bill B...


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Re: B33 project
Boomer #809157 05/17/20 4:17 am
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The T2 denotes Torrington needle bearing in the "A" gear. These are only in two clusters (RR T2, SC T2). The STD 2 "A"gear is a 42-3088 with no needle bearing. Same as SC T, ARRT, ASC T,


Coming to terms with your delusions, is the first step to sanity
Re: B33 project
wadeschields #809232 05/17/20 10:13 pm
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So my B33 came with the STD 2 box but I also have the STD box as well. Which one would be better to use ? and why?


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Re: B33 project
BritTwit #809254 05/18/20 2:23 am
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Originally Posted by BritTwit
The T2 denotes Torrington needle bearing in the "A" gear. These are only in two clusters (RR T2, SC T2). The STD 2 "A"gear is a 42-3088 with no needle bearing. Same as SC T, ARRT, ASC T,


So what does it mean for the gearbox on my fathers A10 that has just T2 and no other letters?

Also does this mean that ALL the pre unit boxes were bushes layshafts? I was lead to believe that some had needle rollers there but could be an old wives tale


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Re: B33 project
BritTwit #809265 05/18/20 4:11 am
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Originally Posted by BritTwit
The T2 denotes Torrington needle bearing in the "A" gear. These are only in two clusters (RR T2, SC T2). The STD 2 "A"gear is a 42-3088 with no needle bearing. Same as SC T, ARRT, ASC T,


I disagree, the "T" denotes the needle roller on the layshaft, I believe it is in the blind hole. The "T2" denotes needle rollers on the layshaft end AND the "A" gear. In other words both (2) shafts.


Bill B...

Last edited by Boomer; 05/18/20 4:17 am.

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Re: B33 project
wadeschields #809268 05/18/20 4:44 am
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Originally Posted by wadeschields
So my B33 came with the STD 2 box but I also have the STD box as well. Which one would be better to use ? and why?
The STD gearing is probably more useful for general use. That was the STanDard gearbox used on most swingarm pre-unit A & B series BSAs. The others were for specific uses (TRIals, SCrambles, Road Race) so had different ratios. Who knows what they were thinking right at the end of the pre-unit manufacture?

Re: B33 project
wadeschields #809269 05/18/20 4:48 am
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Howdy Wade

That’s a great looking project you have

I have an early swing arm ‘54 B33 with a magdyno set up and std box

They’re a blast to ride

S


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Re: B33 project
wadeschields #809270 05/18/20 5:20 am
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Wade: When I look at the complete chart for all the various gearboxes I see that the STD 2 uses the same layshaft as the STD box and thus will not have any needle bearings. A STD T box would have needles on the layshaft. The difference between the STD box and the STD 2 is that there is a different high gear pair of gears. The STD 2 has a 25/18 pair where as the STD has a 26/17 pair. These pairings change the overall ratio of the other gear pairs as they all go through the high gear pairing to drive the sprocket.

So with the boxes you have it would just be deciding on which ratios would be best for your type of riding.

Gordo


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Re: B33 project
wadeschields #809370 05/18/20 10:06 pm
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Hi All,
On the bottom right hand corner of the gearbox data sheet a table shows the ratios

ARRT, ASC, ASC.T and STD2 all share the same ratios, 2.877, 1.754, 1.325 and 1:1

There are more gear tooth differences than the A gears between STD2 and STD

T. gearboxes have needle roller bearings on both ends of the layshaft (do not confuse with TRI which is bush )
T2. gearboxes have another needle roller bearing in the A mainshaft gear (A)


Wade for normal road use fit the STD gearbox

John

Re: B33 project
wadeschields #809394 05/19/20 12:06 am
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Thanks All !! Good info!!


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Re: B33 project
Salty Dog #809395 05/19/20 12:11 am
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Originally Posted by Salty Dog
Howdy Wade

That’s a great looking project you have

I have an early swing arm ‘54 B33 with a magdyno set up and std box

They’re a blast to ride

S

One was loaned to me in New Zealand back in 2010 for the BSA Rally and fell in love with singles ..... One more cog in the obsession works.... I am looking forward to getting this on the road.... Although I have other things on the burner as well... Some closer to being runners then this one....


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Re: B33 project
wadeschields #809939 05/22/20 7:45 pm
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So as I am collecting parts and getting inspiration , I have pretty much decided to go with headlight fork ears instead of trying to find an original nacelle and the heavy fenders... call it the sportier American look I guess.... My question is for the fork ears. Will any of them fit my forks ? Are there differences in the years as far as fitment? Ill probably go with the same headlight that came on my 66 Spitfire with the dial switch since I have most of a spare one.


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Re: B33 project
wadeschields #810013 05/23/20 3:17 pm
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And with the click of a button I change my mind.... Who knows where this project will wind up.... a few beers last night and I am now (soon to be) the new owner of an original rear mudguard . Found it by accident because I was looking for the seat bracket and this popped up because it had the bracket I was looking for and others as well. plus tail light . Im pretty chuff but now I will have to find a front fender and then decide on Nacelle or not.... ??? I guess it all comes down to what becomes available.... Another trouble with the nacelle route is then I am locked into the correct speedo and switches and what not because they go in the tin work .... That could get crazy.....


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Re: B33 project
wadeschields #810238 05/25/20 4:19 pm
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I think any of the B, M, A series fork ears will work. The A65's are shorter between the triple tree.


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Re: B33 project
wadeschields #810863 Yesterday at 10:05 PM
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Wade: From what I have seen the only A65 fork ears that will not work are those from the cranked down upper triple models. Most should work.

Gordo


The roadside repairs make for the best post ride stories.
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