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Zdmk07 Samba Member
Joined: July 31, 2018 Posts: 55 Location: ALABAMA
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Posted: Thu Aug 16, 2018 4:42 pm Post subject: Cold starts w dual EMPI HPMX 40s |
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Folks, just curious, if this car sits for 3-4 days I have to pump the gas pedal to get started or cranks a long time. Just seems like that may dump a lot of gas down intakes (or maybe no bowls on these?) or maybe they drain down when sitting awhile?
New to this so sorry if this has been answered many times before. Is there a better way or is that proper? Thx, Dennis. |
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Krochus Samba Member
Joined: January 01, 2017 Posts: 892 Location: NW Arkansas
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Posted: Thu Aug 16, 2018 4:55 pm Post subject: Re: Cold starts w dual EMPI HPMX 40s |
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My carbs have always been really good natured. Give the gas a couple of pats hold about 1/8 throttle and crank. It usually starts pretty quick then be ready to release because it’s pretty rev happy
Then hold around 1200 for maybe 20 seconds and the carbs will cough a couple times you’ll feel all 4 cylinders light and it’s GTG after that |
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richparker Samba Member
Joined: November 24, 2011 Posts: 6936 Location: Durango, CO
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Posted: Thu Aug 16, 2018 6:08 pm Post subject: Re: Cold starts w dual EMPI HPMX 40s |
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After my bus sits for several days I always prime it. Without touching the gas pedal, I crank it for 10 or so seconds. Stop and crank again for 10 or so seconds. Then 2 taps of the gas pedal and bam, it fires right up. When just sitting over night I skip the priming and just pump the pedal twice. _________________ __________
’71 Westy build
Adventure thread
’65 Deluxe Build |
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mark tucker Samba Member
Joined: April 08, 2009 Posts: 23937 Location: SHALIMAR ,FLORIDA
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Posted: Fri Aug 17, 2018 1:02 am Post subject: Re: Cold starts w dual EMPI HPMX 40s |
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I just turn the key.it spins and fires up. |
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andk5591 Samba Member
Joined: August 29, 2005 Posts: 16754 Location: State College, PA
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Posted: Fri Aug 17, 2018 8:46 am Post subject: Re: Cold starts w dual EMPI HPMX 40s |
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If it starts super easy, its probably too rich. Cold starts normally require an enrichment circuit, such as a choke. I run various dual carbs on several of our cars and they all are a little harder to start when cold and particularly if they have sat for a while. _________________ D-Dubya Manx clone - 63 Short pan,1914.
Rosie 65 bug - My mostly stock daily driver.
Woodie 69 VW woodie (Hot VWs 7/12).
"John's car" 64 VW woodie - The first ever
Maxine 61 Cal-look bug - Cindy's daily driver.
Max - 73 standard Beetle hearse project - For sale
66 bug project - Real patina & Suby conversion
There's more, but not keeping them... |
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andk5591 Samba Member
Joined: August 29, 2005 Posts: 16754 Location: State College, PA
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Posted: Fri Aug 17, 2018 8:48 am Post subject: Re: Cold starts w dual EMPI HPMX 40s |
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If it starts super easy, its probably too rich. Cold starts normally require an enrichment circuit, such as a choke. I run various dual carbs on several of our cars and they all are a little harder to start when cold and particularly if they have sat for a while. _________________ D-Dubya Manx clone - 63 Short pan,1914.
Rosie 65 bug - My mostly stock daily driver.
Woodie 69 VW woodie (Hot VWs 7/12).
"John's car" 64 VW woodie - The first ever
Maxine 61 Cal-look bug - Cindy's daily driver.
Max - 73 standard Beetle hearse project - For sale
66 bug project - Real patina & Suby conversion
There's more, but not keeping them... |
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cbeck Samba Member
Joined: January 14, 2014 Posts: 2494 Location: high ridge, mo
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Posted: Fri Aug 17, 2018 4:23 pm Post subject: Re: Cold starts w dual EMPI HPMX 40s |
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Mine don't idle right until the intakes warm up a little. _________________ My cut in half and rebuild thread
www.thesamba.com/vw/forum/viewtopic.php?t=647779 |
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oprn Samba Member
Joined: November 13, 2016 Posts: 12632 Location: Western Canada
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Posted: Fri Aug 17, 2018 5:54 pm Post subject: Re: Cold starts w dual EMPI HPMX 40s |
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Zdmk07 wrote: |
Folks, just curious, if this car sits for 3-4 days I have to pump the gas pedal to get started or cranks a long time. Just seems like that may dump a lot of gas down intakes (or maybe no bowls on these?) or maybe they drain down when sitting awhile?
New to this so sorry if this has been answered many times before. Is there a better way or is that proper? Thx, Dennis. |
That would be perfectly normal with no chokes and the mixtures set correctly. It will get much worse as the weather cools toward winter - if you actually have winter where you live...
You cannot expect it to start and run cold like a modern car does with all their proper temp sensors and cold start enrichening circuits. Leaving the idle mixture screws extra rich will help as will a more aggressive accelerator pump stroke. |
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YDBD Samba Member
Joined: February 25, 2017 Posts: 890 Location: Bavaria, Germany
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Posted: Fri Aug 17, 2018 10:46 pm Post subject: Re: Cold starts w dual EMPI HPMX 40s |
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On my 1904 with dual 40 idf's it's usually 1 or 2 pumps on the pedal and about 1/4 down and it fires up. Idles rough for about a 1/2 minute and smooths out. And that can be daily depending on the weather.
After 3 weeks it may take 4-5 pumps to get a fire, almost got out to check things but it fired up. _________________ '56 pan Dune Buggy since '69
don't live in the past...but when I did:
'67 bug
'64 baja
'60 dune buggy
'73 Personenkraftwagen Type 182 "Thing" |
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DerrickfromNC1 Samba Member
Joined: October 24, 2008 Posts: 1293 Location: North Carolina
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Posted: Sat Aug 18, 2018 3:22 am Post subject: Re: Cold starts w dual EMPI HPMX 40s |
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Your fuel bowls are leaking down after a few days. That’s why it fires up quickly when you drive it daily. My empi 40s do the same thing. I try and crank my bus up at least every other day to keep the bowls full.
I know I should be addressing the bowl leakage issue but since I only drive it on weekends and I have several other project VWs I’m working on it is low priority. |
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MURZI Samba Member
Joined: August 25, 2005 Posts: 5063 Location: Madisonville, La
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Posted: Sat Aug 18, 2018 10:58 am Post subject: Re: Cold starts w dual EMPI HPMX 40s |
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Run an electric fuel pump and you won’t have that issue. Turn the key and sit for ten seconds. Pump 2-3 times. Turn the key to start. _________________ 62 vert
2276
Tim’s welded heads
45 Dells
A1 sidewinder
Fk44 cam |
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