Author Topic: Speaking of vibration  (Read 13753 times)

Offline trevinoz

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Re: Speaking of vibration
« Reply #30 on: 17.09. 2010 02:20 »
Dave,
          The valve timing is 51-68-78-37 but I don't know the lift.
Maybe Musky can help here. Aren't new cams available?
Trev.

Offline RichardL

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Re: Speaking of vibration
« Reply #31 on: 17.09. 2010 05:52 »
Plan on signing up for the world-wide 2017 DISTINGUISHED GENTLEMAN'S RIDE on September 30, 2018. Watch website at https://www.gentlemansride.com for details.

Offline Hubie

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Re: Speaking of vibration
« Reply #32 on: 17.09. 2010 05:56 »
Hi Trev,

They are available but will be 200 bucks or a tad more with postage.  If my cam can be reground it will cost me less than half that.

Cheers,

Dave.
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Offline Hubie

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Re: Speaking of vibration
« Reply #33 on: 17.09. 2010 07:41 »
In addition, the top of my pistons are stamped 71.5.  Can I safely assume from this that my barrels have been bored out 1.5mm or about 60 thou?  Will be helpful if I am to purchase some new piston rings.

Cheers,

Dave.
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Offline Mark Parker

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Re: Speaking of vibration
« Reply #34 on: 17.09. 2010 09:28 »
Or the compression's going to be really high :)
   Actually as this is about vibration, has anyone ever had experience with the Ballancemaster rings. They are used on Harleys to smooth out the vibes and also to ballance truck wheels tailshafts clutches etc.
On the Harleys they machine a ring in the flywheel and they glue it in, what it has is a plastic ring containing an amount of mercury, from what I've read it makes quite a difference, and if I can get one a suitable size will try it in a 90deg A65, which are pretty smooth anyway, but it would be nice to get ballance shaft smooth without the ballance shaft and performance loss.
Mark
Had a nice A10 once, :( now only have the power egg child A65 :(

Offline Hubie

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Re: Speaking of vibration
« Reply #35 on: 21.09. 2010 12:18 »
Hello again Lads,

It seems after diagnosis that things with my crank are worse than thought.  I have the earlier small journal crank and apparently on the timing side it is 20 thou undersize and as such, I'm told cannot go any further so it appears I may be on the lookout for a new crank.  Questions that I would ask of all you more knowlegable folk out there are, can I have it built back up again?  Can I work it so that a large journal crank will fit my cases and, does anyone have a good crank lying around to sell me???

I did receive my full gasket set and am having my camshaft checked at the moment.  All is not lost and it will virtually be a new motor when finished.

Cheers again,

Dave.
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Offline a101960

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Re: Speaking of vibration
« Reply #36 on: 21.09. 2010 12:57 »
Quote
can I have it built back up again?
Dave,

The short answer is yes. My own crank was refurbished in exactly that way. It is a very common procedure.

John

Online BSA_54A10

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Re: Speaking of vibration
« Reply #37 on: 21.09. 2010 13:13 »
You can get it;-
plated
Flame sprayed
Welded.
As a general rule I go for plating on things like gearboxs & cam shafts
flame sprayed for cranks.
It is also advisable to get it nitrogen toughened as well, a very cheap bit of insurance ( $ 30.00 AUST )
In Sydney I usually get A1 Metalizing to my work but that is just because they are close & handy.
Usually the grinders will have a list of locals who can do the job for you
Bike Beesa
Trevor

Offline Hubie

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Re: Speaking of vibration
« Reply #38 on: 22.09. 2010 06:27 »
The other option I have after speaking again with Brian Dyson this morning is simply to have a new timing side main bush made to the correct clearances with my crankpin.  This should not be a problem I'm told given the bike is not going to be raced.  The big end journals are also fine to be ground to -30.

Will be taking the crank case halves up to Dyson's next week for measuring up for that bush by the look of it and ordering a new drive side bearing from SRM, possibly along with a spitfire cam.  Dyson engineering does not reccomend rebuilding crankshafts by building up the metal by spraying or welding.  Has anyone had this done and got a fair amount of miles from their motor?

Slowly getting there...

Cheers,

Dave.
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Online Brian

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Re: Speaking of vibration
« Reply #39 on: 22.09. 2010 06:40 »
Dave BSA supplied both big ends and timing side down to -.040". I'll add a scan out of the manual to give you the sizes.

If you are going to have a bush made then there is no need to go down another 10 thou, just get them to grind the journal until it cleans up and make the bush to suit, they may only have to grind 3 or 4 thou off it, you would end up with it somewhere around .025" undersize. This means it will have more life left in it for the future.

Online bsa-bill

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Re: Speaking of vibration
« Reply #40 on: 22.09. 2010 07:20 »
 agree with Brian, both my timing side bearings were purchased from C&D Autos who supply solid bushes of a size that allows you to just have the crank "cleaned up" and the bushes reamed to fit (others also will supply said bushes).

Had two bikes done this way, the shop that did them also don't advocate spraying metal
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline Hubie

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Re: Speaking of vibration
« Reply #41 on: 22.09. 2010 08:07 »
Thanks a heap Brian, and everyone.  I was beginning to think I was going to have to find a new crank or have one made - big dollars.  All I want the bike to do is have the go it had when it was new and sit on 60 without rattling apart.  I do most of my riding around town but there's the odd trip of 120-200 miles or so on the freeway and the reason I bought the A10 is that it should be perfectly capable of this.

Cheers,

Dave.
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Offline Hubie

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Re: Speaking of vibration
« Reply #42 on: 22.09. 2010 08:30 »
After just reading the figures, my timing side journal is sitting on 1.335 which is 42thou under.  If I can get it cleaned up and a custom bush made, hopefully it will be okay.
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!

Online BSA_54A10

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Re: Speaking of vibration
« Reply #43 on: 22.09. 2010 12:39 »
You can go a lot further undersize than BSA recommends.
Like most things , they had to cover their back sides and their minimum figures assumes a moron at the bars with 12:1 pistons and a perchant for popping monos.

We had a club member with an A50 bought from Burma where it was hauling a chair.
The main was .13" undersize, yes that was not a typo it was 0.134" undersize,
there was a lump of steel can under all of the slippers which had been badly recast at least once.
I could go on but I think that you get the drift.

If you are going a long way undersize then look for low compression pistons.
You can go as low as 6:1 after which they get really difficult to tune.
Some where between 6:1 and 7:1 will give you a nice ride with enough poke not to run down by bowlers in Charades ( they traded in their Morries) but not enough to drag XR6's off at the lights, You will loose about 10 mph off top which will have you in the 80 mph range which is illegal most places in OZ in any case. The lower ratios will have a better chance of burning the new fuels remembering that e10 becomes mandatory next year which will be replaced with e15 a bit further down the road with the ultimate aim of nothing  above e25 by 2050 when we will have to fit 15 gallon tanks to make it to the next servo.
Bike Beesa
Trevor

Offline Hubie

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Re: Speaking of vibration
« Reply #44 on: 22.09. 2010 13:47 »
Thanks Trevor,

It seems that at only 2 thou under the reccomended minimum a cleanup on the timing side pin and a bush made to fit will do me fine.  I can happily go to -30 on the big end journals and fit a new roller on the drive side and should then be able to happily cruise the freeway.  My confidence in this rebuild is slowly growing!

Cheers,

Dave.
1959 BSA Golden Flash
1956 Royal Enfield Super Meteor
1955 Royal Enfield 350 Bullet
2007 Harley Davidson Sportster 1200 Custom

The early bird gets the worm, but the second mouse get's the cheese!