Playing around with Webers

[Henry Schmidt]

We're working on Weber restorations in house and it looks like we're getting close.

[Henry Schmidt]

[al lkosmal]

oh yea Henry...............very nice.

regards,
al

[chris_seven]

Henry,

It looks as if you have re-plugged some of the galleries with 'grub' screws rather than the lead plugs used by Weber.

Are they a tapered plug?

We have been mucking about with carbs for a while now and make our own gaskets, shafts, throttle plates and a few other parts.

We also bore then to 45mm and carry out a few other mods.

I hope they come up to the mark

[Henry Schmidt]

Yes, they are tapered brass set screws. We set them with LocTite 568 flange sealant to ensure again leakage and vibration.

[chris_seven]

Henry, That's great - can you point me at where to find them as I have only found them with parallel threads.

[KTL]

Henry,

I see one of your pictures shows a carb trio with tall secondary venturis. That made me think of my former set that had been hacked up ("peening" and I use that term really loosely) in an attempt to tighten the loose fit in the slots that carry the venturis. What do you do to restore the fit of the secondaries?

Our rather makeshift but seemingly reliable solution was to use shim stock in the slot which doesn't feed fuel to the venturi. Doing that put more load on the flat steel spring, since we didn't have any new spring steel available to us. Ideally new springs would be the best solution. But I still don't know if just new springs will tighten up the fit of the venturi in the slot.

Thanks and great work as always.
Kevin

[Henry Schmidt]

Chris:
I checked with my machinist and he said I gave you incorrect information. We use a brass 6-32 set screw with LocTite to insure the seal.

Kevin:
I have never seen that issue but a small shim between the house and the venturi seems like a reasonable repair.

[1QuickS]

I've found the best way to fix the loose tall aux venturis is to shave the top of the main throttle body to clamp the end plates on the aux venturi solidly in place when the top cover is reinstalled. The spring will hold the face-to-face alignment while the top cover is installed.

These tall aux venturis loosen due to their center of gravity being somewhat above the center of the flanges which makes the flanges try to resist the rocking motion inherent in our engines. Short aux venturis don't have this rocking motion since their center of gravity is pretty much within the center of the flanges and rocking motion is almost zero then.

[KTL]

Thanks for the feedback on tightening up the venturi fit