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Re: A Series Engine and Carby Combinations

Subject: Re: A Series Engine and Carby Combinations
by ddiesel on 2015/3/14 11:46:16

Prefer Webers myself and been using them for 40 years.
Sidedraft, downdraft, DGV doesn't matter much. They last really well and are very tuneable for many applications. Sidedraft dellortos are better on the progression but parts are harder to come by.

Most "tuning problems" on sidedrafts are the result of cheap linkage systems. Some of them are just plain junk. No fault of the carb unless its been butchered.

32/36 DGV's are cheap to buy and the kits are cheap. Make sure you get a complete kit with power valve and pump diaphragm. Many cheap kits are exactly that.

SU type carbs work OK, are more forgiving and easier to setup.
Any well setup carb should drive smoothly from idle to redline if it has a reasonable cam and assuming everything else is OK.

Carb fires are most likely to be from a leaking inlet valves, ignition problem or just a bad tune/setup. Flame in the inlet manifold doesn't come from the carb.

Be careful with the brass inlet pipes on DGV Webers. If they get leaned on heavily and become loose in the alloy body you WILL get a fire.

If you need help re tuning Webers have a look for books by John Passini.