Popping noise - twin carbs · Aussieveedubbers

Kafer Lover Officially Full-On Dubber

370 posts · joined Aug 2002 · 16 Nov 2004, 10:38 pm

#265411

Finally got my twin carbs on and working well (36 IDF on 1600tp motor). I am happy with the way they are running, and can notice a fair bit more power.
However, especially when cold or idling they make some popping/sucking little noises - what could this be?
Also when starting cold the engine now needs a bit of warming up before it will idle without cutting out.

Any suggestions anyone?

carisma Officially Full-On Dubber

263 posts · joined Sep 2004 · 17 Nov 2004, 6:06 am

#265477

i got twins on my dub to and it takes a bit longer to warm up, but its worth it to get more power out of the car

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 · 17 Nov 2004, 9:17 am

#265579

That popping noise is it is lean.

IF it goes away within a minnute i wouldnt worry TOO much. It will happen when it is cold and first off.

Are you DEFINITELY at best lean mixture. ie is the mixture screw at the SWEET spot????

You MAY want to try going up a size on the idles.

Any idae what size you have now???

Futue te ipsum!!!

shiftyvw Wolfsburg Wizard

523 posts · joined Sep 2002 · 17 Nov 2004, 9:03 pm

#266113

Im not too sure about IDF's but on IDA's some popping at idle on cold starts is usually a good sign that its jetted about right.

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 18 Nov 2004, 12:07 pm

#266392

blocked pilot jet.

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 18 Nov 2004, 12:18 pm

#266402

also check your inlet gaskets, could be sucking air .

This will cause popping (to much air), and will affect idle when cold. Once the engine warms up and the manifolds/gaskets expand from the heat the problem will then usually go away/decrease. If this is the case then retighten or replace the gaskets . Did you use new gaskets ?

Bizarre Moderator The artist formerly known as blue74l

12,789 posts · joined Aug 2002 · 18 Nov 2004, 12:39 pm

#266417

Craig Torrens wrote:blocked pilot jet.

good point

Check the obvious - see if the idle is blocked

This would be the answer if the popping doesnt go away when it warms up

Futue te ipsum!!!