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Hodence Samba Member
Joined: December 15, 2020 Posts: 87 Location: Newburyport, MA, USA
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Posted: Thu Jun 01, 2023 5:54 pm Post subject: Jet Sizes on A Weber 32/36 DFAV Carb |
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I've been working on tuning my 1972 Type 4 1700cc engine. It has a single Weber 32/36 DFAV carb. It runs and drives and I have the idle pretty happy. I can drive around town fairly easily, but when I step on the gas the engine bogs, rpm's drops until it eventually starts to spin up again and pull out of the bog.
It also struggles under heavy loads, so uphill starts are nearly impossible.
I'm fairly inexperienced working with carbureted engines, but I think my carb is over-jetted. I'm going to check my jet size this weekend, but meanwhile, does anyone know what jets should be in that carb originally?
I'm about at sea level, so altitude isn't an influence. And It's only driven from May to September.
What should my jets be?
Any advice is appreciated! |
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Wildthings Samba Member
Joined: March 13, 2005 Posts: 50334
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Posted: Thu Jun 01, 2023 10:20 pm Post subject: Re: Jet Sizes on A Weber 32/36 DFAV Carb |
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Search up the "Progressives Suck" thread and enjoy the read. |
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mikedjames Samba Member
Joined: July 02, 2012 Posts: 2736 Location: Hamble, Hampshire, UK
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Posted: Sat Jun 03, 2023 5:02 am Post subject: Re: Jet Sizes on A Weber 32/36 DFAV Carb |
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It's a lot of work to get it right. I run a progressive on my 1641 bus with stock hot air going into the top of the carburettor and the heat risers underneath. Apart from occasionally falling flat on its face in the first quarter mile of driving, once things are warmed up they stay that way .
I have driven about 90000 miles with a progressive.
Then jetting can be sensible ..
And currently the jetting I am running with is
Primary : Idle 45 main 130 air 170 with standard emulsion tube as provided
Secondary : Idle 80 main 132 air 180, standard emulsion tube
I have now disabledd the power valve and secondary main is now145 with a 220 air. _________________ Ancient vehicles and vessels
1974 VW T2 : Devon Eurovette camper with 1641 DP T1 engine, Progressive carb, full flow oil cooler, EDIS crank timed ignition.
Engine 1: 40k miles (rocker shaft clip fell off), Engine 2: 30k miles (rebuild, dropped valve). Engine 3: a JK Preservation Parts "new" engine, aluminium case: 26k miles: new top end.
Gearbox rebuild 2021 by Bears.
1979 Westerly GK24 24 foot racer/cruiser yacht Forethought of Gosport.
1973 wooden Pacer sailing dinghy |
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2type2 Samba Member
Joined: June 02, 2002 Posts: 975 Location: SW Colorado
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Posted: Sat Jun 03, 2023 6:42 am Post subject: Re: Jet Sizes on A Weber 32/36 DFAV Carb |
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Well I run a progressive on a 2017 stroker (from a1600 DP), and jetting is everything. John at aircooled.net... the article on progressives-- is absolutely essential for you to study. Do your homework and buy the jets you need for your combo. Persevere and you will find the sweet spot. My bus ran crap until i got it jetted right, now it will go up a 1000' hill in fourth gear at 60.
I also ran a progressive on my '78 Westy 2L when I had it, but I never had it right because I never took the trouble to determine best jetting.But it wasn' terrible. New jets are readily available,
It may be hard to find if u need emulsion tubes, but there are enough ppl who have given up on these weber so that there -are pieces around! Onward! _________________ "A life of peace and happiness depends on your own gratefulness" |
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Hodence Samba Member
Joined: December 15, 2020 Posts: 87 Location: Newburyport, MA, USA
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Posted: Sun Jun 04, 2023 2:01 pm Post subject: Re: Jet Sizes on A Weber 32/36 DFAV Carb |
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Thanks for the responses guys. Mikedjames, that's an interesting hot air recirculation system. Now I'm thinking about something like that for myself!
I opened up my carb and looked at the jets and pulled the plugs. Definitely rich!
You'll have to forgive me, I don't know which is primary and secondary, so here are some photos I took of the jets. You can see the upper ones pretty clearly read 160 and 165, and the lower ones are 140 and 137. If anyone can educate me on the correct names for these, it would be greatly appreciated. As usual, any insight at all is always helpful!
Thanks! |
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vwmaniaman Samba Member
Joined: June 07, 2005 Posts: 562 Location: Grand Rivers,KY
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Posted: Sun Jun 04, 2023 2:32 pm Post subject: Re: Jet Sizes on A Weber 32/36 DFAV Carb |
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I have one on my 75 bay westfalia. For me the biggest improvement was to open up the vacuum port a little and put a sdva distributor on it. that lets it advance the timing quicker and helps eliminate the flat spot. It is not a daily driver so it sees no cold or wet roads if I can help it. Once warmed up it runs very good. It does not have sooty plugs and the oil and dipstick stay fairly cool. I wipe the dipstick with my fingers. At 70-75 mph have been getting over 18mpg. _________________ Working on a VW is like fun with a friend!
65 Beetle
75 Westy "Pumpkin Van"
86 Westy "Brown Betty"
87 Cabrio |
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2type2 Samba Member
Joined: June 02, 2002 Posts: 975 Location: SW Colorado
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Posted: Sun Jun 04, 2023 3:24 pm Post subject: Re: Jet Sizes on A Weber 32/36 DFAV Carb |
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You can educate yourself some by downloading an " exploded diagram ", available at redline weber.com. Or just seek in Google for images. The preheat you manage to attain will be the prerequisite to optimal performance , but your jetting choices will be relative to altitude and displaement. There are no absolutes. _________________ "A life of peace and happiness depends on your own gratefulness" |
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