How do YOU start your early Weber40 engine?

[EarlyPorsche]

Just seeing how everyone else gets them started. I have a 2.0 with webers so I give it 3 or 4 pumps start cranking and when it catches I jiggle the throttle to keep it running. You?

[RichF]

I do the same thing. After about 30 seconds or so it will run by itself.

[berettafan]

let fuel pump run 10 seconds then two or three full pumps then just a touch of throttle and turn the key. generally don't have to do anything once she catches even in the coldest weather.

once it's been up to temp if it's off for less than a few hours and temps are reasonable it only needs a touch of throttle to catch.

[EarlyPorsche]

Beretta,

Thats nice. What did you do to make it idle high when cold?

On restart I typically just start cranking and then tap the throttle after about 3 seconds of cranking and it roars to life.

It doesn't hurt that my SR-68 starter spins me up to about 600 RPMS with the engine off.

[berettafan]

doesn't idle high, 900 rpm pretty much all the time. actually dips a bit at stop lights if it's not quite warmed up yet.

fresh rebuilt carbs with tight throttle shafts is about it. just lucky i guess

[berettafan]

in fact i managed to somehow disconnect my throttle lever and don't even miss it.

[JFairman]

When I had cars with Webers that depends on the temperature or if the motor is hot and been sitting 15 minutes or more in the summer.

With cold motor I would listen for the fuel pump to fill the floatbowls and then give a pump or two of the gas pedal/accelerator pumps depending on how cold it is.

When I had dual 45DCOE sidefrafts on a BMW 2002, those carbs had the little cold start fuel enrichment throttle butterfly bypass enrichment devices that I had hooked up to the origonal manual choke cable.
They worked great for cold starts, raising the idle when cold and driving off, and then shut them off after around 30 seconds running.

With a hot motor in the summer that has sat 15-60 minutes there can be some carb percolation/vaporization of fuel that has spilled over into the throats. So the best way I found to start the motor is to keep your foot off the gas pedal and while cranking the starter motor, slowly open the throttles a little to give the motor more air without squirting a bunch more fuel in with the accelerator pumps. Then it starts.

[frankc]

I've decided to add a hand throttle to help with the cold-start procedure as I normally have to keep the engine at a higher idle for the first 30-60 seconds. The parts arrive next week so I'm curious to see how this is going to work out.

[911s55]

Check out Grady's post.

Early 911 Warm Start Problem