BSA Twin Alloy Barrel 500 /650

[Zurfrejoe]

Hi fellow Bsa owners , got fed up trying to get a decent barrel for my 650 twin , thick flange etc etc ! So Ive made my own ,with a 18mm flange !!  in alloy ,the first pics are the first barrel out of the mould , rough but lovely !! I am writing the Cnc program for it now , as I did to make the cylinder casting patterns . My aim is to get my twin just a little more reliable , lighter !! And quicker ofcourse .I am also making a twin carb alloy head for it to.The casting patterns are now finished and the first sand cast forms are made .Its all getting rather exciting at last . Been on this for a while now .Will send more pics as it comes together .

[EDDIE SIMPSON]

great engineering. liners or nikosil for the pistons?
a65 type followers like the domieracer?
got a spare set knocking about?

[zurferjoe]

Hi Eddie , going for liners on the first set ,650cc , then 750 .Once Ive done some miles on them I will be making as few sets a few people are interested and have contacted me . I hope the twin carb alloy head comes out as good ,and shed a few pounds at the same time . As for the pistons I will use American JRs ,better quality and price .And the followers standard at first so the other guys can use the followers they already have , saves a few bob .Then I will sort out the followers .   Will keep you in posted on my progress.

[A10 JWO]

A true craftsman, not many left; you must be proud. Merry Christmas and keep us updated.

[EDDIE SIMPSON]

hi joe,
i hope they will be top hat liners like the jap bikes. i am not a great fan of the hepolites with only a small step.

[zurferjoe]

Yes Im looking at various liners and pistons at the moment . These JE pistons are looking good and if the price is right I will use them .

[zurferjoe]

And use these rods from MAP in the states . Anybody out there running an engine with a 90degree crank in it ?

[EDDIE SIMPSON]

hi joe,
you seem to be going down the same route as js motorsport in the u.s.
have you checked out their website?

[zurferjoe]

Hi Eddie ,yes Ive seen the JS website ,nice stuff and great porting tips ! Ive been impressed with Alp Sungurtekin on his Triumph pre unit bike at Bonneville a 750 pushrod that does 175mph !!You can see it on You Tube,and the boys from Lowbrow Customs Bonneville 2017 ,there getting there to !  thats the direction Im going !! Merry Christmas to all And A Happy And healthy New Year

[zurferjoe]

The first rough sandcasting cores are now being refined and blended ! 35mm inlets at first then bigger for the planned 750 engine .

[zurferjoe]

Just an update on my Alloy A10 /7 barrel , now Ive improved the quality and also making an update for the the camfollowers A65 style in bronze holders. All I got to do is machine it !