I've just got the 73 on the road and registered, with its brand new 1835 (044 heads (I think 40 x 37 valves, they were bigger than standard), counterweighted crank, stage 2 (HSC 2) cam).

Problem is, I built the motor thinking that I was going to run it with twin 40 IDF's. They proved too difficult for the local guys to tune, so it now has a single 40 DCNF on it. Is this enough carby for it ? it feels good out of corners, but doesnt seem to rev like a c/weighted engine should, and doesnt seem to have alot of top end snort.

I still have the webers, but not the time, knowledge, skill (or money currently) to set them up myself. Does anyone here know someone in Perth that knows Webers and VW's ?

Thanks muchly.

A set of twin IDF's will be much easier than a single DCNF to set up!
That said i had pain setting up my IDF's .....but they did get sorted.
The problems in the end were
1) a dud coil
2) not believing my motor wanted 40 idles

What is the problems with the IDF's?

definately not enough.
my 1916 with twin kadrons is begging for more at 6 grand.
find someone who can sort the IDF's for you.

You say your 1916 is screaming for more carb at 6000rpm - what cam and heads are you running? I'm not familiar with the cam Doug's running, but I doubt he'd be running out of carb on anything streetable. An 1835 should be able to pull well over 6000rpm through a 40mm dual choke carb if everything is set up right (though, the manifold might start to become a restriction.)


In answer to your question, Doug: I suspect the lack of "top-end" you are noticing is the restriction of your cam rather than your carb - but check your pugs in case it simply isn't jetted right. That is, do a long highway run and have a look at them to see if you're running lean. Your set-up requires larger jets (main) than some mechanics expect.

If you get your carb sorted, put your duals up for sale here (if you're into serious street you'll love it.) Or give me a call and I'll tell you of some folks in Freo who can set up your duals for you - but it might cost a few bob.

My SC runs a 1600SP. For the sake of originality I wanted a manual choke so I kept the 28PCI but i upjetted it (to about 145 I think) & had a bit reamed out of the venturi. It runs fine-a bit rich even- the tail pipe is a bit sooty but no sign of plug fouling after about 12 months.

The heads on my engine are 044's, with heavy valve springs, normal rockers, 40x37 valves (I think) and slightly enlarged ports (standard 044 ports).

The cam is a high speed conversions stage 2. Its a re-ground standard cam - I've no idea of duration etc, I guess I should really find out. The cam (I'm terrible with trying to describe these things) is in between a mild street cam and a race cam. I would be surprised if it was causing the top end restriction - I always thought I just couldnt get enough air thru the carbies.

The engine is fully balanced and has a counterweighted crank - it should rev 7000 + if i let it (which I wont).

The carby is reasonably old too - maybe I should put a carby kit through it ?

Another possibility - the engine isnt run in yet. It was VERY tight before we ran it (new P&C's) - maybe this is something that will come good as things bed / wear in ?

Keep the suggestions coming please !!

ps - I will check the plugs like you said.

Try giving GerryKay Auto in Morley a ring on 9272 3502 Gerry has been a VW spana man for a long time and builds heaps of formula 'V' motors. Was tellen me one day that he use to ballance twin carbs by ear and was allways spot on. Bit old for it now but I'm shore he'll be able to sort you out. He has heaps of knowledge.

Cheers Nige