The BSA A7-A10 Forum

Technical => A7 & A10 Engine => Topic started by: zurferjoe on 01.07. 2020 14:33

Title: A7 ,A10 Alloy Barrel update
Post by: zurferjoe 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   
Title: Re: A7 ,A10 Alloy Barrel update
Post by: RichardL on 01.07. 2020 14:38
THAT is fantastic! Is it something you think can be produced in commercial quantities?

Richard L.
Title: Re: A7 ,A10 Alloy Barrel update
Post by: zurferjoe 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 .
Title: Re: A7 ,A10 Alloy Barrel update
Post by: beezermacc 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.
Title: Re: A7 ,A10 Alloy Barrel update
Post by: muskrat on 01.07. 2020 20:45
G'day Joe.
Great work mate.
I'll have a pair (barrels and head) when their done.
Cheers
Title: Re: A7 ,A10 Alloy Barrel update
Post by: RDfella 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.
Title: Re: A7 ,A10 Alloy Barrel update
Post by: zurferjoe on 01.07. 2020 22:38
On IT !:-)
Title: Re: A7 ,A10 Alloy Barrel update
Post by: RichardL on 02.07. 2020 11:46
"Impressed" is an inadequate word.

Richard L.
Title: Re: A7 ,A10 Alloy Barrel update
Post by: Kickaha 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
Title: Re: A7 ,A10 Alloy Barrel update
Post by: RDfella 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.
Title: Re: A7 ,A10 Alloy Barrel update
Post by: rocker21 on 03.07. 2020 13:00
brilliant, let us know when they will be available, i am sure you will sell a few!!!
Title: Re: A7 ,A10 Alloy Barrel update
Post by: RichardL 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.
Title: Re: A7 ,A10 Alloy Barrel update
Post by: Kickaha 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
Title: Re: A7 ,A10 Alloy Barrel update
Post by: zurferjoe 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 !!
Title: Re: A7 ,A10 Alloy Barrel update
Post by: a10rgs 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 
Title: Re: A7 ,A10 Alloy Barrel update
Post by: zurferjoe on 06.07. 2020 11:02
Hi Uwe , no I didnt know him , but I sure will contact him , thank you Harry
Title: Re: A7 ,A10 Alloy Barrel update
Post by: Daithi on 06.07. 2020 14:14
They look fantastic. Keep up the good work 👍
Title: Re: A7 ,A10 Alloy Barrel update
Post by: Seabee on 06.07. 2020 17:54
I'm just really thankful that someone has taken the initiative and investment of time and money to create these cylinders! I won't be in the camp that questions the manner in which he provides them...………….
Title: Re: A7 ,A10 Alloy Barrel update
Post by: a10rgs on 07.07. 2020 11:29
Moin Harry,

you could also speak to Hebsch (Herbert Schüssler) https://bikersmill.de/! About 30 years ago he tried to get some Aluminium barrels made but ended up with a batch of cast iron ones!
What is your idea with the cam followers and the cylinder head bold threads?

Uwe
Title: Re: A7 ,A10 Alloy Barrel update
Post by: bikerboy on 26.09. 2020 15:12
Wow!!!!!!!!!!!!!!!!!!!! Just WOW