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Old August 1st 2004, 06:14
bennyg bennyg is offline
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Join Date: Aug 2004
Posts: 1
Jetting question, Plaese help. 1.8l type 4

Please help me with getting the right jets:

I am running dual weber 40 IDFs. They came with the following jets/setup:

air correction 2.00, Emulsion tube F-11, main jet 1.15, pump jet 0.50, idle jet 0.50, venturii 28mm

We ran the engine for a few minutes yesterday, but it got quite hot and sounded like it was running with too much air (popping)....

The engine spec is:

1.8l type 4

93MM Pistons (Porsche 914, domed to increase compression)

66mm stroke crank

308 degree webcam, (valve lift: 0.507, duration at 0.050: 272 degrees, Grind no. 86c)

polished + mildly ported type 4 heads

Stock rockers

Bosch 009 Distributor (Standard points)

THe car is a full weight 1972 Beetle running a 1500 gearbox.

Can anyone help me get the right Jets?

Last edited by bennyg; August 1st 2004 at 13:41.
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Old August 2nd 2004, 16:52
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Wally Wally is offline
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Join Date: Nov 2002
Location: The Netherlands
Posts: 2,542
Change and try or reserve dyno time...
Your popping is more likely an intake (vacuum) leak and your cam seems very very wild for that engine, which could result in a very bad mixture from idle to mid-revs and subsequent bad burn, meaning too lean a burn, resulting in excessive heat...
Maybe a slightly bigger idle jet (52?), bit smaller air correction (190). Test and try...or get a wide band CO metering device (

'75 Super.
...because race car!
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