Twin carb head

[trevinoz]

John,
            I think this is the second time this head has gone through and not sold. Not worth that sort of money anyway.

Brian,
        the 358 camshaft timing figures are 57 - 77 - 90 - 51.  I can't remember where I got this info from or if it is accurate.
A mate had one in the early 60's and said it was not much good on the road so he quickly put the 357 back in.
Trev.

[chaterlea25]

Hi Trevinoz,
I believe parts down under go for less money than in the Northern hemisphere ???? ????
Fleabay has wrecked the autojumble scene here, Ebay dealers go around and buy up anything
to resell on the net.
For example recently someone paid £511 for this Lucas King of the road mirror on Ebay. no 160364886152
Sheer maddness
What about £104 for a BSA propstand (of course advertised as RGS or Gold Star)  no.180413250175
Maybe you should start exporting stuff north

Regards
John O R

[rocket man]

your right the best stuff is going fast at least there in demand
so my bike is a good investment as there going up all the time

[muskrat]

G'day all,
            here is mine. A7 with A 10 valves, ported for 30mm carbs & through bolted.
Cheers

[rocket man]

that looks a great mod mate well done

[olev]

He's back..... and a hundred bucks cheeper.

http://cgi.ebay.com.au/BSA-ROAD-SUPER-ROCKET-GOLDSTAR-A10-AL-HEAD_W0QQitemZ190341971661QQcmdZViewItemQQptZAU_Motorcycle_Parts_Accessories?hash=item2c5143fecd&_trksid=p3286.c0.m14

I bought a toolbox off this bloke a while back. It was no bargain but I'm happy.

Trevor,
do you think it might be Arthur starting to unload?? maybe his ceiling has collapsed.
cheers

[trevinoz]

Olev,
             It's not Arthur. I have bought a couple of bits off this bloke also, his name is Ian.
Funny thing about old Arthur, he contacted a mate recently trying to get some bits and pieces. God knows why as he has enough in his shed to keep a team of restorers going for a lifetime.
If he just sold his pile of alloy heads he could live comfortably.
Trev.

[rocket man]

some people are horders and dont like letting stuff go

[GuyboA10]

G'day, i've dealt with Arthur b4 and i would NEVER do it again!! He is a prick. I think he is short a few screws in his head, but not in his shed, apparently. cheers, Guybo.

[bl**dydrivers]

there was a twin carb head on ebay.co.uk that went for 155.00 had the manifold included, might have required some work but gosh what a bargain.

[old53]

Ive never really understood how fitting twin carbs improves performance (although im sure it does).On a single carb engine ,once every revolution, one of the cylinders takes its turn to draw in fuel/air mixture through the carb.On a twin carb engine each clylinder breathes through its own carb every other rev which is the same thing.So why is that better?
  I could understand if both cylinders were trying to draw mixture through the carb at the same time.But they dont.
  I can only think that on the twin carb the inlet tract takes a more direct and less convoluted  path  than on the single so its streamlining the flow.Is that it?
Mike

Hello  just logged on to this forum and like Mike I am wondering if there is any statistical/performance facts  on how much improvement fitting twin carbs to A10 achieves. -Carey

[RichardL]

Carey,

I know jack about twin-carb heads, but I can detect when a new member is trying to enter the forum  discretely and without a lot of fuss. So let me support that effort by saying,



"HEY, CAREY, WELCOME TO THE FORUM!!! GLAD YOU COULD JOIN US! I LIKE THE LOOK OF YOUR BIKE AND HOPE TO SEE MORE PICTURES SOON."  

Richard L.

[muskrat]

G'day Carey,
                 ditto to Richard L's post, welcome.
Twin carbs do work better. I picked up 10 seconds a lap at Eastern Creek after fitting '54 A7 "twin carb" head to my '57 A7SS. Look at most performance motors, past and present, they have a carb and pipe for each cylinder.
Cheers

[Lightningpower]

What size do you think those monoblocs would be?

[Rocket Racer]

surprising to see the 276 pre monobloc carbs on a 1956 - 60 twin port head!

They would be TT racing carbs rather than humble 276 or 289 carbies