Vw t25 2.0 aircooled engine 1980

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Bigmini66
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Vw t25 2.0 aircooled engine 1980

Post by Bigmini66 » Thu Jun 21, 2018 6:16 pm

Hi ive just had fitted a set of webber carbs 34ict pict but running great on idle. When engine warmed up and i take it for a run it is lacking power in first and second gear but goes great in third gear, can you tell me what size jets are correct for them to be running realy good. Any advice would be much appriciated thanks



Bigmini66
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Re: Vw t25 2.0 aircooled engine 1980

Post by Bigmini66 » Thu Jun 21, 2018 6:18 pm

Forgot to mention that when its sat on tickover it smells alot of petrol from exhaust

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Edmond
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Re: Vw t25 2.0 aircooled engine 1980

Post by Edmond » Thu Jun 21, 2018 7:30 pm

Retrovan(Herman) on this forum has good experience with weber ict carbs drop him a pm I'm sure he will help you

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retrovan
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Re: Vw t25 2.0 aircooled engine 1980

Post by retrovan » Thu Jun 21, 2018 10:37 pm

This sounds like you fuel pump is too strong for the Webers.

You need a low pressure pump,it must be as low as 1.5 to2.5 bar only, anything higher and she will push past the floats.

Also see that you have the vacuum balancing tube between your two carbs manifolds, must be at least 8 to 10 mm inside size.

And you need to have a vacuum tube from each carb with a "T" piece and then to your vacuum point on your distributor.

Also set up each carb without linkage connections joined, till they are balanced, then only join the accelerator peddle linkages to operate both card, perfectly in unison.

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1952 Split Beetle 1835cc twin 34ICT's (Azure Blue)
1968 Fastback (2Lt.type4)twin 34ICT's( Red)
1972 Low Light Bay Panel Van (2Lt type 4)twin 34ICT's(White)
1975 Fleetline Panel Van 1914cc twin 34ICT's(Aqua Blue/White)

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Tony Z
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Re: Vw t25 2.0 aircooled engine 1980

Post by Tony Z » Fri Jun 22, 2018 1:29 am

retrovan wrote:
Thu Jun 21, 2018 10:37 pm

You need a low pressure pump,it must be as low as 1.5 to2.5 bar only, anything higher and she will push past the floats.
He means psi, not bar

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retrovan
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Re: Vw t25 2.0 aircooled engine 1980

Post by retrovan » Fri Jun 22, 2018 10:32 am

Totally correct Tony, late night slip..Thank you

The jet sizes I would think are right as you say it runs well in 3rd gear.

But have a look, it should be 145 Main Jet, and 55 Idea Jet for your 2000cc motor.

If she runs a bit hot, go 1 size up on your main jet, but this should not be necessary.

Herman
1952 Split Beetle 1835cc twin 34ICT's (Azure Blue)
1968 Fastback (2Lt.type4)twin 34ICT's( Red)
1972 Low Light Bay Panel Van (2Lt type 4)twin 34ICT's(White)
1975 Fleetline Panel Van 1914cc twin 34ICT's(Aqua Blue/White)

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