Weber 40IDF Question

[Marvel]

A few months ago I had the bus tuned on a rolling road, when the main jet and idle jets were replaced which out gave me an output of 117bhp from my 2100cc block.
Since new though, the last hand carb has always leaked, so I finally took them over to James at Stateside for him to take a look. He's worked his tricks and fixed the leak, but he has asked if I would like to increase the Venturi to 32mm. I'm gonna talk to James anyway, but what are people's thoughts, and is it worth doing?

 

[sparkywig]

I've got 32mm vents in the 40's on my 2054.
Stock valve sizes, just ported and flowed.

 

[Marriedblonde]

Whats the spec of you engine marvel? Heads, Cam etc? I am guessing you are running a stnadard 100 cam?

J.

 

[Marvel]

Specification 78.80 x 90.5
Vw jnl 78.8 forged crankshaft
OEM VW flywheel
web 86 torque camshaft
OEM Mahle 90.50mm stroker piston kit
OEM heads
The carbs have had the main jets and the idles changed from original also, but can't remember the values to be honest

 

[Marvel]

I've made my decision! I've spoken to James and we're increasing the main jet to 135 and the venturis to 32mm.

 

[jonboylaw]

What idles? 55 or 60s?


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[Marvel]

I think they were 55s...

 

[jonboylaw]

Should be sweet. I'm on 60 /130/30mm chokes on 36 dells 1955cc


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