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Which Carb Has Better Fuel Control Off Road?
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Vanapplebomb
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PostPosted: Fri Feb 21, 2014 4:05 pm    Post subject: Which Carb Has Better Fuel Control Off Road? Reply with quote

On type 4 engines, do the stock Solex 32-34 PDSIT carburetors have good fuel control when the going gets bumpy? Do they hold their tuning well? How do they compare to Webber IDFs when getting bounced around?
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Dale M.
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PostPosted: Fri Feb 21, 2014 4:17 pm    Post subject: Reply with quote

pssst!.... If you want best fuel control go EFI.....

Dale
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PostPosted: Fri Feb 21, 2014 4:18 pm    Post subject: Reply with quote

Dale M. wrote:
pssst!.... If you want best fuel control go EFI.....

Dale

While true, it's not what he asked.
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Dale M.
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PostPosted: Fri Feb 21, 2014 4:36 pm    Post subject: Reply with quote

Glenn wrote:
Dale M. wrote:
pssst!.... If you want best fuel control go EFI.....

Dale

While true, it's not what he asked.


Maybe going to EFI didn't occur to him, and may be a little suggestion may get him to think outside the carb box.... Might even get him to thinking he does not need a distributor either....

And yes I know, he did not ask about distributors ...

Dale
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Vanapplebomb
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PostPosted: Fri Feb 21, 2014 11:12 pm    Post subject: Reply with quote

I want to stick with carbs...same story with distributors.
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PostPosted: Fri Feb 21, 2014 11:38 pm    Post subject: Reply with quote

The stock carbs will need work, such as external float bowl vents and fixing the throttle shaft bushings which always go bad.
Personally I never liked the way one carb adjusting the idle mixture for both carbs.
Use a set of 36DRLA Dellorto's or 40IDF Webers and install a float bowl vent stack in them.
On both style of carbs can be improved with the use of Jet Doctors that CB sells.
Maybe you don't like using JB Weld to hold the vent tubes in place, FAT Performance does it and has won many off road races with them with out them falling out.

If you really drive in rough conditions then go to dry sump (sucker system) for the carbs. It works extremely well.
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PostPosted: Sat Feb 22, 2014 9:02 am    Post subject: fuel control Reply with quote

I have used 36mm dellortos on my 82 westy as well as using them on my sand rails with smaller engines without any mods and they have always worked excellant. Yes, I use the german 009 distributor too.
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Vanapplebomb
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PostPosted: Sun Feb 23, 2014 10:34 pm    Post subject: Reply with quote

I guess I wonder because I'm looking for a stock type 4, and they came with the dual Solex PDSIT carbs. I like the idf/hpmx carbs for their ease of set up and tunability. I don't know much about the Solex carbs other than the fact that they are definitely more complex, but seem to work really well when set up right.

Still open for opinions on which of the two would have better fuel control off road Wink
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PostPosted: Wed Feb 26, 2014 11:58 am    Post subject: Reply with quote

34 PICT-3 modified for off-road use...

Image may have been reduced in size. Click image to view fullscreen.
Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.


fuel cut-off removed & plugged, with external bowl vent
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PostPosted: Wed Feb 26, 2014 1:44 pm    Post subject: Reply with quote

Where does the bowl vent connect to?
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Vanapplebomb
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PostPosted: Wed Feb 26, 2014 3:31 pm    Post subject: Reply with quote

Hu, interesting. I have never heard of anyone putting a 34 PICT 3 on these engines. What makes the PICT 3 modified for off road better than the PDSIT carb if one were to make the same modification?

Also, does anyone sell an intake manifold for this set up?
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PostPosted: Wed Feb 26, 2014 6:14 pm    Post subject: Reply with quote

The bolt pattern is different on the two carbs. Not interchangeable with out work.
Anything can be done, it just do you want to spend the time figuring it out and making linkage for it to work.
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Vanapplebomb
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PostPosted: Wed Feb 26, 2014 6:43 pm    Post subject: Reply with quote

Yeah, it seems like a custom manifold would have to be made... cut and splice a couple pieces together in order to make it work. Sounds like more work than it is worth unless someone can give me me good reason why 34 pict 3 carbs would be better off road than the stock carbs Wink
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PostPosted: Sun Jul 13, 2014 2:42 pm    Post subject: Reply with quote

Well, looks like I am going to give the stock 34 PDSIT 2/3 carbs a shot since I already have a set on hand. I will definitely need to replace the throttle shaft bushings as well as all the gaskets and diaphragms.

Appart from extending the float bowl vents, are there any other modifications that I can make to improve the performance of these carbs for a little off road fun?
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PostPosted: Sun Jul 20, 2014 2:01 am    Post subject: Reply with quote

I believe Bill was showing the mods on the 34PICT 3 for reference on what to do to the 34PDSIT. The float bowl vent hoses can be connected to a fuel filter with the other side of the filter open.
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PostPosted: Sun Jul 20, 2014 7:58 am    Post subject: Reply with quote

I recently went back to the 34 pict 3 on my rail as well. I am liking those mods for off road use! I do not have my choke hooked up. Can I just remove the choke butterfly? What are the advantages of these mods for off road use?
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PostPosted: Sun Jul 20, 2014 11:30 am    Post subject: Reply with quote

One major thing wrong with stock carbs is press in fuel inlet barb... Inlet needs be drilled and taped for thread in barb... Same with early fuel pumps with press in barbs...

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fishybastard
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PostPosted: Sun Jul 20, 2014 12:19 pm    Post subject: Reply with quote

I noticed that garbage press in fitting with no barb as well. Seems a bit sketchy.
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PostPosted: Sun Jul 20, 2014 12:29 pm    Post subject: Reply with quote

Dale M. wrote:
One major thing wrong with stock carbs is press in fuel inlet barb... Inlet needs be drilled and taped for thread in barb... Same with early fuel pumps with press in barbs...

Dale


Would AN fittings on the stock fuel pump be overkill?
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PostPosted: Sun Jul 20, 2014 12:55 pm    Post subject: Reply with quote

lustig69 wrote:
Dale M. wrote:
One major thing wrong with stock carbs is press in fuel inlet barb... Inlet needs be drilled and taped for thread in barb... Same with early fuel pumps with press in barbs...

Dale


Would AN fittings on the stock fuel pump be overkill?


Probably when something like this would suffice..

Image may have been reduced in size. Click image to view fullscreen.


Probably less than $5 at local hardware, its just a matter of getting carb inlet drilled and tapped to proper size without destroying it... Be careful with DIY here, carb top is cast zink or some other "pot metal" and you can easily crack it when screwing in tapered fitting...

Would be better with straight cut thread (and seal washer) than tapered (NPT)... Possibly like inlet fittings for (late) Weber carbs...

Dale
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