Which SFC motor would you buy?

helicopterjim

helicopterjim

Hero member
Location
near Lone Butte, BC, Canada
 
2 SFC engines for less than the price of one... Take both, only rivet counters care about the small valves.
 
Both engines are SF, Thomas. If you're lucky maybe there are some SFC bits in there. If there's a CR gearbox inside then it still is cheap.
 
Thomas aus LAU said:
#8687 may be an SFC-Motor = price would be very cheap.

#12824 is not a SFC-motor in my opinion. Normal SF-Pistons, normal conrods,.... .
For a normal motor in that rotten condition too expensiv.

Both numbers are not listed in the SFC-Registro from Borghesi.

Best Thomas aus LAU
Click to expand...

Don't worry too much about the SFC Registro.
Polishing rods and webs is easy. You don't even need to dismantle the crank. It has been done.  ;)

Paul

 
helicopterjim said:
Have you checked with the PHB dealer? I hear he has lots of rare and unobtainable carburetors in stock.

You just need to find a way to shift to the alternative reality where these carbs exist.

Jim
Click to expand...

My cannabis dealer says he can arrange some carbs, big bore.

Paul
 
Amal's still available new from manufacturer. Not unreasonably priced and much improved from originals in the pilot circuits and float material. Slides are now hard anodised as well. I remember these carbs being introduced back in the mid sixties and a local expert trials rider who worked at Triumph to develop them fitted one on his Tiger Cub. Whilst ticking over beautifully he laid the bike on it's side and it just kept running then repeated the display on the other side. Impressive at the time. He then said and I'll never forget it "all Amals by design are just a series of flat spots held together with a rich mixture". He was a stalwart at Triumph and stayed to the death of the cooperative, still giving after dinner talks at local bike clubs. Happy days.
 
No Clem, Bob Haines. AKA "Dobbin", big lad. Works rider for Francis Barnett as a teenager before moving to Triumph. Travelled the world training dealers and mechanics, as they were back then. He even converted a 650 unit for trials. I've never seen so much mud being distributed over such a large area as Dobbin on that bike.
 
BobSol said:
"all Amals by design are just a series of flat spots held together with a rich mixture"
Click to expand...

Gold! (bigthumb)

Yep, new 600 and 900 series Amal concentrics are available, in 3 price/quality catagories.  "Normal" and "premier" from Burlen/Amal Carburettors, and the Wassel copy, available from many brit parts dealers.  The "premier" series looks as though they might even work properly and last a bit more than 3 months before the slide develops slop...

piet
 
Don't touch the Wassel's. Had a pair fitted on my TR6C (Bonnie head) and couldn't get the damn thing to run right. Just cheap Amal copies. Bit the bullet and bought a pair of premier 932's and they were perfect.
 
The main difference between the 750 SFC engine and the SF0 engine was that the SFC engine used Needle Bearing on the crank and the SF0 used Ball Bearing  - As far as the rest of the engine = Very little difference save for (Compression ratio ?) Valve dia, Cam Profile and authentic Lay Out of the ride like rear sets and 2 into 1 headers.

Both engines could approach 8000rpm except the the SFC could maintain it for track. A Breganzie  750 SFC is useless on the street. Designed for the track without a Generator or Starter.
 
Laverda SF said:
The main difference between the 750 SFC engine and the SF0 engine was that the SFC engine used Needle Bearing on the crank and the SF0 used Ball Bearing  - As far as the rest of the engine = Very little difference save for (Compression ratio ?) Valve dia, Cam Profile and authentic Lay Out of the ride like rear sets and 2 into 1 headers.

Both engines could approach 8000rpm except the the SFC could maintain it for track. A Breganzie  750 SFC is useless on the street. Designed for the track without a Generator or Starter.
Click to expand...

Better do some homework Ron.

All SFCs came with starters and generators, they were built for long distance endurance events.

Although outwardly similar/identical, the SFC donks were sigificantly different inside, ranging from polished cranks to close-ratio gearbox clusters.  BTW, the SFC crank ran on ball bearing outer mains.

piet
 
According to year, just about everything in those engines is different, including alloy castings.

And out of the box, they have lights and a horn. The American market ones are even (un)graced with indicators and a speedo.

They make great fast road bikes. I even used mine quite regularly for camping trips.
I'm now deaf, and have a buggered neck and back.

Paul
 
Dear Ron, Piet is being too polite
everything you said about SFC engines is wrong, wrong and totally wrong again.
please be careful, there are people here who have worked on and maintained literally dozens of them, have you ever opened one??
don't stop telling us of your exploits on two wheels and four, four by four and with firearms as well.
CLEM
 
I relinquish, apparently Aussies know a hell of a lot more knowledge then I do between the differences of a 750 SFC build and a consumer 70 SF0 ;o)

I never said the SFC didn't come with a starter or generator save for racers took them off to save approx 35 lbs and used a Diode with a Magneto with their Amal Carbs and long duration cams ;o)

I'm Canadian not American. Canadians got 200 1970 Breganzie 750 SF0's in late 1972 into 73 to be assembled from a crate and had to registered as a 73 in Canada. The issue was Trade negations. The dissembled 70 750 SF0 sat in crates for almost 3 years before being expedited into Canada to save a Production Vehicle Canadian Import Tax. By then the $1100 Honda 750 CB ripped the heart out of European Motorcycle Dealerships across Canada.

I was fortunate enough to get one and NEVER have regretted it. Really a true 8000rpm 750 twin back in early 70's.

Granted the SFC could maintain 8000rpm longer - It was designed for it.

Clem: Are there any 1970 Breganzie 750 SF0's in Australia ?

------------------

WARNING - DO NOT attempt 8000rpm with any Breganzie 750 Twin unless it's either a SFC or SF0 ;o)

The 70 750 SF0 was a parts kit delivered by the Breganzie Factory only to Canada - Prove me different !
 
You must log in or register to reply here.
Back
Top