TheSamba.com :: View topic

Sun May 13, 2012 11:30 am

Thinking of using a single carb on my 1776 DP with 110 cam. I like the single carb look. Which carb would be the best option?
Any estimate how much HP loss there will be not using double carbs? ( 2 single Solex 34's)
Thanks KJ

Sun May 13, 2012 12:06 pm

:? A 1776cc (90.5) pistons will need more fuel...not less in order to run efficiently.

A cool nice look is not the way to go..

I have the same size engine (Turbo) with the Weber side draft carb.

It makes power.

You could/should run with either the Dual Webers (NO ICT 34 carbs) but the 40mm Kadron will work nicely if not Webers or Delortos...the last three being the best choice. I have seen them all.

The 34 ICT will work with the stock 1600cc and the Kadrons with a 1641 (87mm) setup with or w/o a special cam. The 110 is a nice mileage street cam.

Bound to be a difference of opinions thats for sure...just mine here.

Sun May 13, 2012 1:21 pm

My educated guess is at 4,000 rpm - you'll lose about 15 to 20 SAE HP with a stock single Solex.

At 4500 rpm - the loss rises to over 20 SAE HP, because the HP will be dropping once the revs go beyond 4K on a 1776cc running a stock Solex.

Bottom line: With a single 34 PICT Solex and stock camshaft - your torque curve will be in decline by 3,000 rpm on a 1776cc air cooler.

Dependent on the grind of the camshaft, the torque curve with duals will be nice and flat or rising until 3500 rpm.

Kaddy Shack has a chart comparing a stock 1600 with an upgrade to Kads.

http://kaddieshack.com/1600dynoresults.html

Note the torque curve for the 1.4 to 1 ratio rockers. It's solid until about 3500 rpm.

- Andrew in Austin, TX -

Mon May 14, 2012 5:13 am

I have a 1776 with a single 40IDF. Runs like a champ, but I am fouling plugs now. Trying my best to get it jetted right.

Mon May 14, 2012 8:20 am

:!: ZENITH :!:

Mon May 14, 2012 9:31 am

That Zenith looks to be a very nice center mount set up.

It's not at all as bodacious like some others I've seen, but it should get the job done with regards to producing torque at higher revs for passing or getting onto the freeway.

Is that air cleaner assembly gutted and fitted with a full flow or is it stock?

http://www.thesamba.com/vw/forum/viewtopic.php?t=424278&highlight=flow

On the Zenith and IDF 40 center mount set ups, what's the limit on venturi size before the end castings get in the way?

I've seen the end castings shown below below, which are pricey and rarely get a mention on Samba.

http://www.thesamba.com/vw/forum/viewtopic.php?t=424278&highlight=flow

- Andrew in Austin, TX -

Mon May 14, 2012 12:01 pm

the "k&n" type air cleaner & cut-out mod made a HUGE difference.
and so did the effort i put into ensuring proper manifold & and intake air heat.
http://www.thesamba.com/vw/forum/viewtopic.php?t=386388&highlight=progressive
and so did all the work i did on the heads.
http://www.thesamba.com/vw/forum/viewtopic.php?t=478262&highlight=compression

the carb itself is just one piece of the engine "system".
borninabus wrote: 1600DP
counter-weighted VW crank
040 heads worked over by ME

stock long block/cam; 7.4:1 C/R
Bosch VJR4 BR8 (o19) dist - with BREMI points
Zenith 32 NDIX on a vintage EMPI manifold
vintage Treuhaft header & muffler - with proper heat riser
genuine Porsche swivel feet valve adjusters
T4 oil cooler w/ hoover bit & working thermostat
356 fan pulley (not pictured)
Berg Equalizer (not pictured)
modified stock air cleaner also with proper preheat
engine built, ancillaries assembled, installed & tuned by ME

275cht - 180ot - 25mpg - 65mph

Mon May 14, 2012 2:39 pm

My 34PICT with 1776/110 cam does great on the highway in a Westy... I also like the stock look... unless Pete gives me a Zenith! :lol:

Sun Nov 16, 2014 2:56 am

ccpalmer wrote: My 34PICT with 1776/110 cam does great on the highway in a Westy... I also like the stock look... unless Pete gives me a Zenith! :lol:

Sorry to raise an old post, what jetting and dizzy are you running?
Thanks,

Sun Nov 16, 2014 9:05 am

I am running a 130 main, 60z air and 55 pilot jet. 205z distributor.

Sun Nov 16, 2014 10:10 am

I would like to see someone make a well heated 360 degree single 2 barrel carb manifold.

Dan