Author Topic: A7 ,A10 Alloy Barrel update  (Read 668 times)

Offline zurferjoe

  • Moving Up
  • **
  • Join Date: May 2018
  • Posts: 19
  • Karma: 2
  • Trying to make my A10 faster
A7 ,A10 Alloy Barrel update
« on: 01.07. 2020 14:33 »
Hi there , well with all the pandemics going on I can now do some real work !! Here is a rough  build up of ther A10 Alloy barrel ,its the first tryout casting , and first program check .I got it almost right just need a tick more meat on the corners !! Thats now been done and cast .But ofcourse the machine shop  are not working !!You win a few you lose a few . But it gives me time to build the engines for next years Bonneville ,500/650/750,and run the first one on the road and put a few thousand miles on the clock.But one things form sure it sure is lighter !! So stay safe all you people , look after your selves all the very best Harry   
The older you get , the faster you were !First picture of the BSA A10 alloy barrel !!

Online RichardL

  • Outside Chicago, IL
  • Wise & Enlightened
  • *
  • Join Date: Nov 2007
  • Posts: 5076
  • Karma: 48
Re: A7 ,A10 Alloy Barrel update
« Reply #1 on: 01.07. 2020 14:38 »
THAT is fantastic! Is it something you think can be produced in commercial quantities?

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.

Offline zurferjoe

  • Moving Up
  • **
  • Join Date: May 2018
  • Posts: 19
  • Karma: 2
  • Trying to make my A10 faster
Re: A7 ,A10 Alloy Barrel update
« Reply #2 on: 01.07. 2020 15:10 »
Yes I will be ,as there seems to be no barrels available anywhere .And we need to keep these great motorcycles on the road and not in museums !!That why Im making a new twin carb heads ,get the old girl keeping up with the best of them .
The older you get , the faster you were !First picture of the BSA A10 alloy barrel !!

Online beezermacc

  • Wise & Enlightened
  • *
  • Join Date: Dec 2011
  • Posts: 1010
  • Karma: 39
  • Not for the purist!
    • Priory Magnetos Ltd.
Re: A7 ,A10 Alloy Barrel update
« Reply #3 on: 01.07. 2020 16:23 »
Absolutely brilliant to see somebody putting in serious work to keep our bikes going and improve them if possible.
Priory Magnetos Ltd - A10 spares, magneto and dynamo refurbs. www.priorymagnetos.co.uk

Online muskrat

  • Global Moderator
  • Wise & Enlightened
  • **
  • Join Date: Jul 2009
  • Posts: 8330
  • Karma: 107
  • Lithgow NSW Oz
    • Shoalhaven Classic Motorcycle Club Inc
Re: A7 ,A10 Alloy Barrel update
« Reply #4 on: 01.07. 2020 20:45 »
G'day Joe.
Great work mate.
I'll have a pair (barrels and head) when their done.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Online RDfella

  • Resident Legend
  • *****
  • Join Date: Aug 2017
  • Posts: 896
  • Karma: 8
Re: A7 ,A10 Alloy Barrel update
« Reply #5 on: 01.07. 2020 21:18 »
A cylinder barrel is 'relatively' easy - 2/3 days making the pattern then a day or so machining and fitting liners. If making batches, the pattern time is amortized and making jigs to cut machining time becomes viable. But a cylinder head? Life is too short to go there. I wouldn't even consider making a pattern for that.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Offline zurferjoe

  • Moving Up
  • **
  • Join Date: May 2018
  • Posts: 19
  • Karma: 2
  • Trying to make my A10 faster
Re: A7 ,A10 Alloy Barrel update
« Reply #6 on: 01.07. 2020 22:38 »
On IT !:-)
The older you get , the faster you were !First picture of the BSA A10 alloy barrel !!

Online RichardL

  • Outside Chicago, IL
  • Wise & Enlightened
  • *
  • Join Date: Nov 2007
  • Posts: 5076
  • Karma: 48
Re: A7 ,A10 Alloy Barrel update
« Reply #7 on: 02.07. 2020 11:46 »
"Impressed" is an inadequate word.

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.

Online Kickaha

  • A's Best Friend
  • ***
  • Join Date: Apr 2014
  • Posts: 131
  • Karma: 6
Re: A7 ,A10 Alloy Barrel update
« Reply #8 on: 02.07. 2020 20:36 »
A cylinder barrel is 'relatively' easy - 2/3 days making the pattern then a day or so machining and fitting liners.

Why liners and why not Nikasil ?

I've looked into doing the same thing, cost was going to be about $3000 NZD for the finished product for a one off
1955 BSA Gold Flash
New Zealand

Online RDfella

  • Resident Legend
  • *****
  • Join Date: Aug 2017
  • Posts: 896
  • Karma: 8
Re: A7 ,A10 Alloy Barrel update
« Reply #9 on: 02.07. 2020 20:56 »
Cast iron liners aren't expensive and are proven. Nikasil has to be farmed out and has suffered problems over the years. I note the price is around £1,500 - I'd expect a new alloy barrel with liners to be less than half of that.
'49 B31, '49 M21, '53 DOT, '58 Flash, '00 Firestorm, Weslake sprint bike.

Offline rocker21

  • A's Best Friend
  • ***
  • Join Date: Jun 2011
  • Posts: 98
  • Karma: 2
Re: A7 ,A10 Alloy Barrel update
« Reply #10 on: 03.07. 2020 13:00 »
brilliant, let us know when they will be available, i am sure you will sell a few!!!

Online RichardL

  • Outside Chicago, IL
  • Wise & Enlightened
  • *
  • Join Date: Nov 2007
  • Posts: 5076
  • Karma: 48
Re: A7 ,A10 Alloy Barrel update
« Reply #11 on: 03.07. 2020 14:06 »
Am I correct that the combustion chamber cores are intentionally small to allow the chambers to be machined to shape?

Richard L.
Plan on signing up for the world-wide 2020 DISTINGUISHED GENTLEMAN'S RIDEon September 27, 2020 (if it's not cancelled and we are free to move about by then). Watch website at https://www.gentlemansride.com for details.

Online Kickaha

  • A's Best Friend
  • ***
  • Join Date: Apr 2014
  • Posts: 131
  • Karma: 6
Re: A7 ,A10 Alloy Barrel update
« Reply #12 on: 03.07. 2020 22:43 »
Cast iron liners aren't expensive and are proven. Nikasil has to be farmed out and has suffered problems over the years. I note the price is around £1,500 - I'd expect a new alloy barrel with liners to be less than half of that.

I'd expect it to come in around the £1000-1100 doing it over here with cast liners, Nikasil hasn't really had any problems for decades and is used by all the major manufacturers, I was looking at it from the point that rebores aren't needed so you can select what size piston you want and stick with it
1955 BSA Gold Flash
New Zealand

Offline zurferjoe

  • Moving Up
  • **
  • Join Date: May 2018
  • Posts: 19
  • Karma: 2
  • Trying to make my A10 faster
Re: A7 ,A10 Alloy Barrel update
« Reply #13 on: 05.07. 2020 10:02 »
Yes I will do the first ones with liners , everybody can fix those ! And are easier and cheaper to install and make .But I will try out the alloy Nikasil on my planned Bonneville racer ,I dont know if Nikasil gets on with a Nitromethane !Because thats what Im running it on .But ofcourse I will be road testing both liner and Nikasil on the road ,on petrol , puttinga few thousand miles on the clock.Before hitting the salt .Price , yes your about right ,but I havent worked it all out yet , as its not just the cylinder +liners+plus longer crankase studs as the barrel flange is now 17mm thick .But it will be in that ballpark figure ,as I want to sell them and not have a very expensive toy !!
The older you get , the faster you were !First picture of the BSA A10 alloy barrel !!

Offline a10rgs

  • Moving Up
  • **
  • Join Date: Mar 2019
  • Posts: 10
  • Karma: 0
Re: A7 ,A10 Alloy Barrel update
« Reply #14 on: 06.07. 2020 10:35 »
Moin zurferjoe,

do you know Rainer Traupel?

http://www.motortechnik-traupel.de/motortechnik.html

He makes A65 aluminium barrels plated with Nikasil! Maybe he can give you some helpful information!

Uwe