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Thu Nov 19, 2009 2:26 pm

My customer is interested in making his stock drum brakes in his 1968 bus power boosted. http://www.thesamba.com/vw/forum/viewtopic.php?t=384674&highlight=drum+brakes We've read a recent thread on this and have a pretty good idea what we'll need to buy and fabricate in order to make it work but here's my question. The engine is a 2007cc type 1 with dual dellorto carbs. How should I tap into the intakes in order to get a vacuum source? Do I tap into just one throat, one on each side, or all four? I'm guessing that tapping into just number three might work. After all, once the engine is running I don't think it would affect anything as long as there were no leaks.

Thu Nov 19, 2009 2:43 pm

My Dual 36 Dells were tapped at both manifolds just below the tops. Kind of a hack job as they were sealed with JB Weld. I'm not sure if both are required, as one of the lines on mine was pinched with an adjustable clamp (to reduce vaccuum I suppose?) Anyway, I'm going to have bungs welded to the manifolds to make the fittings fit better and not look so ugly.

They worked well for stock late bay discs I have up front.

Thu Nov 19, 2009 2:43 pm

My Dual 36 Dells were tapped at both manifolds just below the tops. Kind of a hack job as they were sealed with JB Weld. I'm not sure if both are required, as one of the lines on mine was pinched with an adjustable clamp (to reduce vaccuum I suppose?) Anyway, I'm going to have bungs welded to the manifolds to make the fittings fit better and not look so ugly.

They worked well for stock late bay discs I have up front.

Thu Nov 19, 2009 2:47 pm

I'd suggest a balance tube with a nipple for the brake booster.

Thu Nov 19, 2009 4:01 pm

where did you get the oil dip stick temp gauge?

Thu Nov 19, 2009 4:11 pm

70Westy wrote: where did you get the oil dip stick temp gauge?

Hmmm, I can't remember. Probably from Thesamba classifieds.

Thu Nov 19, 2009 4:29 pm

I have the same carbs you have. I tapped into just the number three for my 71 with the disk brakes and vac booster. Works just fine.

Thu Nov 19, 2009 4:37 pm

Here is a pic of some CB solex carbs designed for type I or IV engines...

you can see the idea, a crossover may be needed...I didn't use my PB after I installed these, and never removed the crossover.

Thu Nov 19, 2009 5:07 pm

volksterii wrote: I have the same carbs you have. I tapped into just the number three for my 71 with the disk brakes and vac booster. Works just fine.

I'm thinking it's the easiest way to go

Thu Nov 19, 2009 5:20 pm

70Westy wrote: where did you get the oil dip stick temp gauge?

The box had some paperwork. Here's a link: http://mainelycustombydesign.com/

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This is a direct replacement for your original oil dipstick. There are no modifications required for use

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Thu Nov 19, 2009 5:41 pm

aeromech wrote: volksterii wrote: I have the same carbs you have. I tapped into just the number three for my 71 with the disk brakes and vac booster. Works just fine.

I'm thinking it's the easiest way to go

Just make sure you use the size fitting on the manifold that is large enough to pull the proper vac. Also, you may install the fitting at an angle (pointed slightly down inside the manifold) to help with the vac.