how to start a car fitted with Weber Carburettors?
Discussion
None of my Weber fitted 7's ever had a choke.
If electric pump fitted; switch on, wait for the pump to slow down, 4 or 5 pumps on the throttle, operate the starter and the beastie should run.
If mechanical pump; A few pumps on the throttle and operate the starter. Be prepared to play with the throttle as soon as there's life.
Good luck :-)
If electric pump fitted; switch on, wait for the pump to slow down, 4 or 5 pumps on the throttle, operate the starter and the beastie should run.
If mechanical pump; A few pumps on the throttle and operate the starter. Be prepared to play with the throttle as soon as there's life.
Good luck :-)
I haven't seen a Caterham with a choke knob. The usual way is to prime the engine using the throttle pumps, mine likes 5-6 pumps of the throttle before starting but some start with no pumps! As with a choke of course, you'll only need to do this if the engine is stone cold and hasn't run in over 4 hours.
HolbaySS said:
If mechanical pump; A few pumps on the throttle and operate the starter. Be prepared to play with the throttle as soon as there's life.
This is what I do too. If it's sat for a while, up to eight pumps of the throttle, then turn it over with no throttle at all, then as soon as it fires about half throttle to help it on its way.I've owned three cars fitted with twin side draught carbs, two with Webers, one with Solex (Strada Abarth 
)
With all three, any use of the choke almost guaranteed flooding. From cold two or three pumps and then catch it with the throttle and allow to warm a little before allowing to idle. From hot just turning the key was all that was required.
)With all three, any use of the choke almost guaranteed flooding. From cold two or three pumps and then catch it with the throttle and allow to warm a little before allowing to idle. From hot just turning the key was all that was required.
Never use the choke, if its conected disconect it, even when I ran my Lorus Sunbeam in Norway I never had the choke conected, even in the middle of winter. Let the pump prime the float chembers and then either pump the trottle a few time, if cold, or if hot open the throttle betwee 1/4 and half, with no pumpoing, I've had loads of cars with twin webbers since my E;an Sprint in the 70's and they are all a little different, I have two now and they start differently, the 1700 Super sprint needs no throttle even from cold, while I have a 1300 cross flow that needs half throotle even when hot.
downsman said:
From cold two or three pumps and then catch it with the throttle and allow to warm a little before allowing to idle. From hot just turning the key was all that was required.
This is what worked for my 1700 Supersprint. Didn't take long to be able to leave it to idle by itself - 20 secs or so was generally enough, whatever the weather/temperature.
Same here (1600 Crossflow on Twin Weber 45s). No choke fitted. Usually starts with about 5 to 6 pumps of the accelerator.
If the car has not been driven for a while (months sometimes in my case) it can take quite an effort to get the engine started - often up to ten minutes of careful pedal pumping. The main concern in these circumstances is making sure you don't run the battery down.
If the car has not been driven for a while (months sometimes in my case) it can take quite an effort to get the engine started - often up to ten minutes of careful pedal pumping. The main concern in these circumstances is making sure you don't run the battery down.
Thanks everyone for your input.
Car has no choke and is fitted with a mechanical pump. I was only using two throttle pumps and it seems better with three or four.
What is the suggested technique if after a few pumps the car fires but then dies? Is it more throttle pumps or leave it alone?
JB
Car has no choke and is fitted with a mechanical pump. I was only using two throttle pumps and it seems better with three or four.
What is the suggested technique if after a few pumps the car fires but then dies? Is it more throttle pumps or leave it alone?
JB
Crossflow Kid said:
JB052 said:
What is the suggested technique if after a few pumps the car fires but then dies? Is it more throttle pumps or leave it alone?
JB
I just crank it again without any priming. Anything more floods it.JB
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