1961 BSA Super Rocket Rebuild
- Thread starter Jerry Doe
- Start date
Jerry Doe
Admin
- Joined
- May 21, 2003
- Messages
- 2,293
I would be curious about the pistons too.
Today I split the cases. The cam does not look too bad. It’s the 0357 high cam. I think it looks good enough to use, but I have to figure out how to measure it properly. They used larger crank journals on the later a10s, so I hope I have one of those. Crazy balancing holes on the crank too. In general other than grime, things look as expected. I don’t like how they center punched around the sump trap plugs. One things for sure the crank has been split before me as you might expect in 60 years.
Here are some more pics
Today I split the cases. The cam does not look too bad. It’s the 0357 high cam. I think it looks good enough to use, but I have to figure out how to measure it properly. They used larger crank journals on the later a10s, so I hope I have one of those. Crazy balancing holes on the crank too. In general other than grime, things look as expected. I don’t like how they center punched around the sump trap plugs. One things for sure the crank has been split before me as you might expect in 60 years.
Here are some more pics
- Joined
- Mar 7, 2020
- Messages
- 3,156
That camshaft looks good considering the glutinous state of of some of the rest of the engine....
Re: 'Large journals'... I've just been reading an article quoting Dave Degens in the 60's building race engines, and he questions whether larger diameters and high revs go well together (all to do with 'peripheral velocity')
Irrelevant to a cooking BSA, of course
Re: 'Large journals'... I've just been reading an article quoting Dave Degens in the 60's building race engines, and he questions whether larger diameters and high revs go well together (all to do with 'peripheral velocity')
Irrelevant to a cooking BSA, of course
MikeG
VIP MEMBER
- Joined
- May 31, 2012
- Messages
- 1,298
The radially placed bolts holding the flywheel tell me it's a large journal crank. It does look like it's been balanced, and I noticed a big difference in mine after I had that done. It dod not diminish vibes that much, but it moved it to an RPM range out of where I normally am at cruise. Sludge trap has definately been out a few times. Look for new hex head plugs to replace them.
- Joined
- Jul 25, 2015
- Messages
- 1,182
it may be specs for North America were different , but my 1961 super rocket did not have a spitfire cam as standard... ( it was only 5 years old and unlikely to have been changed)Do get a comb for locating the push rods . and as its all apart investigate having an end fed crank conversion. Make sure the sludge trap is clean and be warned mine suffered from serious brake fade ie if braking down from 70 or so there was absolutely nofront brake from 30mph on .. I suspect the grade of iron used inthe hub.
Simple way to tell what youhave is from the numbers. Ithink all DA10 R had large journalcranaks and of course the heavier flanged base flanged cyclinders.
Simple way to tell what youhave is from the numbers. Ithink all DA10 R had large journalcranaks and of course the heavier flanged base flanged cyclinders.
- Joined
- May 28, 2003
- Messages
- 2,591
You can find some cam data here.
AGTS-library-bsa
FWIW I hate this zenforo stuff where they substitute the meta data for the link I insert!
The books show DA10R engines 60-63 came with 357
59 and earlier SR was 356
AGTS-library-bsa
FWIW I hate this zenforo stuff where they substitute the meta data for the link I insert!
The books show DA10R engines 60-63 came with 357
59 and earlier SR was 356
- Joined
- Jul 25, 2015
- Messages
- 1,182
A10 1956 valve clearance - a7a10.net
www.a7a10.net › fois worth looking at for it posts EDDIE DOWS tuning note for A!0 engines
Last edited:
Jerry Doe
Admin
- Joined
- May 21, 2003
- Messages
- 2,293
Thanks Dave, yes I have already been looking at that.
Jerry Doe
Admin
- Joined
- May 21, 2003
- Messages
- 2,293
Its nice to break away from the computer every so often and head in the garage. Yesterday I was able to install the swinging arm along with new bushes and shaft. It was not easy as these a10s have stupid swinging arm setup, but I did it!
I removed the rods and it seems like its on standard grind, but well pitted. So I will probably have to get it ground all the way. The rods are shot.
I really need to find someone locally who can do machine work on my cases (Denver). Jim doesn't do BSA's
I need a good chrome company and can ship. Seems there is no where near me. I called a place and they want $700 to plate my rear mud-guard/ Fender. Seems a lot.
I removed the rods and it seems like its on standard grind, but well pitted. So I will probably have to get it ground all the way. The rods are shot.
I really need to find someone locally who can do machine work on my cases (Denver). Jim doesn't do BSA's
I need a good chrome company and can ship. Seems there is no where near me. I called a place and they want $700 to plate my rear mud-guard/ Fender. Seems a lot.
- Joined
- May 28, 2003
- Messages
- 2,591
FROM Roy Bacon book:
A10 Super Rocket
1958-59: .008/.008 (67-356)
1960-63: .008/.010 (67-357 probably export only in 60-61, 67-356 for home, used for all from 62)
I have 4 BSA factory parts books circa 1949-53, 1954-57, 1958-59, 1960-63.
No notes for exceptions.... like "export only".
I accept the BSA book for 60-63 DA10R-101 on parts applications
I would like to see some authentic BSA literature saying they had home market versions.
A10 Super Rocket
1958-59: .008/.008 (67-356)
1960-63: .008/.010 (67-357 probably export only in 60-61, 67-356 for home, used for all from 62)
I have 4 BSA factory parts books circa 1949-53, 1954-57, 1958-59, 1960-63.
No notes for exceptions.... like "export only".
I accept the BSA book for 60-63 DA10R-101 on parts applications
I would like to see some authentic BSA literature saying they had home market versions.
Craig
VIP MEMBER
- Joined
- Dec 20, 2005
- Messages
- 3,454
For any that may be looking for the red and gold “pear shaped BSA badges” , found them in Walridge flyer that landed in mailbox today (sale ends Feb 28/21) , Mike is selling pairs of them for $79.95 CAD , not sure if that a good price or not ... they are available ..... Also a few used steel Norton tanks that appear to be decent ....
texasSlick
VIP MEMBER
- Joined
- Jan 2, 2013
- Messages
- 4,258
Quality chrome plating is expensive. The management and disposal of waste water and satisfying EPA adds 25 to 30% to the cost. Quality chrome is a three layer copper - nickel - chrome, with decent thicknesses of each.
I gave $300 US several years ago to chrome my primary cover. The cost is all related to the square inches. Do the math, relate the sq. Inches of your mudguard to an Atlas primary cover, that will give you an estimate of the fair cost of plating the mudguard. I would say $700 is in the ballpark.
North Texas Quality Chrome in Gainsville Texas did my primary cover and some other details.
Slick
Onder
VIP MEMBER
- Joined
- May 11, 2010
- Messages
- 4,263
I have had good luck with Paul's in PA. Not cheap. Quality remember
after the price is forgotten.
after the price is forgotten.
Get An Estimate
When shipments arrive, they are opened one at a time and the contents are photographed for inventory control. The pieces are then individually examined and priced.
paulschrome.com
Jerry Doe
Admin
- Joined
- May 21, 2003
- Messages
- 2,293
I contacted a few chrome companies. I did not hear back from most of them. I think I am going with this company as they actually replied to me, but not sure yet. https://www.redspartsattic.com/chrome-plating/
- Joined
- Apr 15, 2009
- Messages
- 11,525
https://restorationplating.com
Show quality and show quality prices. One of the guys in our club uses them and he's "meticulous".
Similar threads
