Porsche carb motor start-up

[Chassis87]

Hey all,


Just a simple question,


my 73 2.4T carb motor - takes 3 cranking to start up in the morning. It always fire's up on the 3 one though.


Is this normal?

Can I do something to improve this? was thinking of a reduced gear starter motor if this would be helpful



Timing was checked and it seams to be ok, I have electronic ignition fitted on it and also PMO 40's...that's about all the mods the motor has.


Thanks

Chassis

[Jack Stands]

That sounds pretty normal. As the Webers don't have any chokes, the carbed motors aren't that quick to start. Porsche actually had an apparatus to squirt raw fuel down the throats in the late 60s/early 70s, but realized that was a bad idea (started too many fires).

We're all spoiled by the quick starting of modern engines with fuel injection! Fewer and fewer people remember the days of depressing the gas pedal to set the choke, then start the car. Fewer still remember the days when you pulled out the choke lever, started, then pushed the choke back in before driving off once the car was warmed up.

[toddu]

Few pumps to get some gas in the bowels first??

[juanbenae]

Originally Posted by toddu

Few pumps to get some gas in the bowels first??

thats what i do. still takes a few trys depaend on how long it's sat.

[Mikey83835]

Turn the ignition on for a few seconds and let the fuel pump do it's thing, and then you need to enrich the mixture, for about 35 degrees air temp, I pump the gas 12 times before trying the starter, for about 50 degrees, I pump it 5 times,

[moneymanager]

The car is from 1973 for goodness sake.
Forty years ago lots of cars took a few tries to catch even when they were new.

[bike2ride95]

Waking up is never easy

[Uncle Enzo]

Ive got a carbed 2.7 and it takes a good three shots till she wakes up. After about a min of coughing and burping she is good to go.

[JMatta]

2.4 with 40 IDA Webers...as stated, turn ignition to hear fuel pump running. Three pumps to the loud peddle and then try to start. May take a time or two, but it does catch, even after prolonged sitting.

[Chassis87]

Hi Guys,


Thank you all for your replies and tips,


sry for the question but from where I'm from these cars are very rare so nothing really to compare too..


Helpful as always Thanks


Chassis

[boyt911sc]

Originally Posted by moneymanager

The car is from 1973 for goodness sake.
Forty years ago lots of cars took a few tries to catch even when they were new.

The '73 VW bug is parked in the street and have to be moved for street cleaning. Last week the temperature was in the single digit and drove the car. Three or four pumps on the gas pedal and it would start 9 out 10 times regardless of weather on the first attempt. There is something basically wrong with your set-up.

Tony

[Roger 911]

I had Webers on my '72 2.4. My routine for starting was; 1) turn on ignition and listen for the fuel pump to fill the bowls, 2) pump pedal fully three times, 3) lift hand throttle, 4) depress pedal partially (25%) while cranking. It would almost always fire on first try. Even after sitting for weeks.

Roger

[JJ 911SC]

I think they are temperamental...

My 3.2 (motronic) never started on the first try, always on the second...

Even after I installed the EFI system (yes, I let the pump cycle for 12 seconds) same result.

[Trackrash]

Originally Posted by Roger 911

I had Webers on my '72 2.4. My routine for starting was; 1) turn on ignition and listen for the fuel pump to fill the bowls, 2) pump pedal fully three times, 3) lift hand throttle, 4) depress pedal partially (25%) while cranking. It would almost always fire on first try. Even after sitting for weeks.

Roger

Unless my car has sat for a while it always starts right away when I use a similar method like this.

1. Turn on key, wait a few seconds.
1. Pump throttle once.
3. Turn the starter and simultaneously push the throttle to 1/3 rd and hold it there.

Starts on the first crank.

The key for my car is push the throttle as you are cranking.

[Chassis87]

Hi all,


Tried the above mentioned methods of leaving pump on and partial open throttle and started first time no problem.

was scared of flooding carbs up I suppose.

Thanks you all for the advice!


chassis

[blucille]

Others have said it, but I want to be clear....if you've ever disconnected the fuel lines on these and turned on the pump, surprising little fuel comes out, for these carb'ed motors, fuel pressure is set very low, turn on the key count to 10 (on my car) then pump the gas a good 3 or 5 times, each time, holding the go pedal down for 5 seconds.....yup, there's 30 seconds before you even touch the starter position.

Works for me on even the coldest day

Oh, yeah, while cranking, for off the gas, hand throttle Closed until it catches, when it sputtering on its own, introduce a little hand throttle.