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drmini in aust
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PostPosted: Thu Sep 06, 2012 10:38 am 
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mini1990 wrote:
Woolies is Caltex here in Sydney too!?

Yes it is.
I got 1 bad load of Vortex 98 (supposedly) in the Mini from my local Woolies a year ago so I won't use it now. It swelled the HS6 SU's main jet hose shut, I barely made it home.
IMO, fuels should be coloured for ID so we know what we're getting (like in the old days). Caltex's is all clear, could be anything from E10 to 98.

At least Ultimate is green....

Next time I can't get BP Ultimate, I'll use 7/11's, is Mobil 98. :wink:

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Morris 1100
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PostPosted: Thu Sep 06, 2012 3:49 pm 
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mickmini wrote:
Original design had the carb at the front of the car, but they moved it to the rear simply to prevent carb icing. The final design for the single SU had the inlet for the air filter casing pointed towards the exhaust manifold. The owners manual says to rotate the air filter casing to point the inlet right at the exhaust in winter and away from it in summer.

The story about turning the motor around because of carby ice is a myth started by BMC to hide the real problem which was the gearbox.
With the motor facing the other way the drop gears from the motor to the gearbox was two big gears instead of three little gears. The big gears carried too much inertia and the A30 based box couldn't handle the abuse.

The Austin Maestro and Montego has the motor facing the other way with the SU carby just behind the grille.
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9YaTaH
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PostPosted: Thu Sep 06, 2012 5:55 pm 
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Darrell wrote:
Ice is formed in venturi-type and slide-type carburettors in ambient air temperatures ranging from about –10 °C to +30 °C if refrigeration and adiabatic cooling within the airways are sufficient to lower the air/fuel mixture temperature — and consequently the metal of the carburettor — below the freezing point. There must also be sufficient moisture in the air, but this need not be visible moisture. Ice may form at the fuel inlet, around the valve or slide, in the venturi and in curved passages, choking off the engine's air supply. If icing continues, this will cause the engine to stop.


Way too intelligent a response for Ausmin Dazza :!: :shock: :lol: :roll:

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9YaTaH
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PostPosted: Thu Sep 06, 2012 5:58 pm 
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Morris 1100 wrote:
mickmini wrote:
Original design had the carb at the front of the car, but they moved it to the rear simply to prevent carb icing. The final design for the single SU had the inlet for the air filter casing pointed towards the exhaust manifold. The owners manual says to rotate the air filter casing to point the inlet right at the exhaust in winter and away from it in summer.

The story about turning the motor around because of carby ice is a myth started by BMC to hide the real problem which was the gearbox.
With the motor facing the other way the drop gears from the motor to the gearbox was two big gears instead of three little gears. The big gears carried too much inertia and the A30 based box couldn't handle the abuse.

The Austin Maestro and Montego has the motor facing the other way with the SU carby just behind the grille.


Someone say Montego??? check the spotteds!! :lol: 8)

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Darrell
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PostPosted: Fri Sep 07, 2012 9:34 am 
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Sorry about the intelligent and long winded post about carby iceing guys, flying is my other passion.

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drmini in aust
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PostPosted: Fri Sep 07, 2012 9:37 am 
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Darrell wrote:
Sorry about the intelligent and long winded post about carby iceing guys, flying is my other passion.

Made sense to me, ta for the info. 8)

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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Morris 1100
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PostPosted: Fri Sep 07, 2012 3:56 pm 
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Darrell wrote:
Sorry about the intelligent and long winded post about carby iceing guys, flying is my other passion.

I think you nailed it though! :lol:

I know a bloke in California that has suffered carb ice on a 20° day.
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GT mowog
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PostPosted: Fri Sep 07, 2012 4:02 pm 
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drmini in aust wrote:
doogie wrote:
Funny part about this is that Shell & BP fuels come out of the same refinery!

Doogie

BP used to come out of Shell's Clyde refinery but not now, I believe it's shut.
There is/was a pipe between the refinery and the BP terminal, under Duck creek.


There is actually a pipe line from the Caltex Kernell Refinery to the Shell / BP Dept at Silverwater. From there it continues on to Newcastle.

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Morris 1100
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PostPosted: Fri Sep 07, 2012 4:06 pm 
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GT mowog wrote:
drmini in aust wrote:
doogie wrote:
Funny part about this is that Shell & BP fuels come out of the same refinery!

Doogie

BP used to come out of Shell's Clyde refinery but not now, I believe it's shut.
There is/was a pipe between the refinery and the BP terminal, under Duck creek.


There is actually a pipe line from the Caltex Kernell Refinery to the Shell / BP Dept at Silverwater. From there it continues on to Newcastle.

Did you hear the one about the bloke up around Wyong way that got caught selling cheap fuel out of his backyard. :lol:
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Damo
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PostPosted: Wed Sep 12, 2012 10:33 pm 
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I have nothing intelligent to add - just my story of carby icing of HIF44 carb in an SC12 supercharger suck-through setup.

The missus and I were driving along Lady Talbot Drive (near Marysville) on an atrocious day. It was freezing cold, intermittently torrentially raining and hailing. It was making the gravel portions of the 46 km track pretty treacherous. I gave MOKEME heaps of beans as we scrabbled our way up a slippery slope that I was convinced we weren't actually going to make. As we neared the crest we had actually built-up a fair bit of speed and I sh*t myself when I backed off the accelerometer and the car barrelled on. Within a split second we topped the crest and were greeted with a sharp turn. Panicing I hit the brakes and clutch together. Realising my error, I grabbed the keys and switched the engine off.

Too late - I'd thrown (and destroyed) the supercharger belt which took out every blade on the mechanical fan. I jiggled the throttle to clear the ice and proceeded to limp home (without boost). It was a sloooow trip.

Yeah, that's what NOT to do when you suffer carby icing. :oops:
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