I've run SU HS6's, ZS and Weber DGVs on my TR6. I've had the DGV's for
about six years now and although they run well and don't require any
tinkering, I'm going back to the SUs. It sounds like your temperature
compensators are the problem on your Zeniths. As Bob L mentioned, make sure
the throttle shafts are in good shape and not hanging. If you're not
comfortable doing the work, pull them off and send them to Joe Curto for
rebuilding if you want to stay with the ZS carbs.
Bob is right about the poor design of the manifold adapters on the DGVs as
they do rob power. I don't really have a serious issue with the DGVs but
they make the car run more like a Chevy with a 4 barrel than a British
sports car with the quick throttle response of the sidedrafts. I'm mainly
going back to the SU's because I simply prefer the way the engine runs with
the sidedrafts vs. down drafts. If you really want some DGV's, email me off
list as I'm going to put them on eBay in about 2 weeks or so.
Terry Geiger
Florence, Alabama USA
http://www.shoalsbritishcars.org
'74 Triumph TR6 * '63 Triumph Herald * '84 Mercedes 300D Turbo Diesel
----- Original Message -----
From: <samuelsma@aol.com>
To: <6pack@autox.team.net>
Sent: Monday, February 20, 2006 3:14 PM
Subject: Weber DGV carbs
> Listers:
>
> For those who don't remember, I have a very nice '76 with upgraded motor,
> suspension, interior, rust-free body and chassis, etc. Since I bought the
> car, however, it has had periods of running roughly related to carburetion
> (twin Z-Ss). I tinkered for a while and then had my service tech tune
> them, with good results for a week or so. Then they went off-song again,
> and he did some additional repairs and the car ran well for a few days.
> Now it is running rough again. He assured me that he can find the
> problem and repair it, but I asked a broader question: Is there a better
> carburetion system for this car in order to maximize reliability and
> tunability? I sold my '70 PI because I could never get it to run right
> and no one could fix the PI system. Now, I have a really special example
> of a TR6 in my favorite color and all my dream modifications, and I still
> can't get it to run right.
>
> Anyway, he has a lot of Weber experience and suggested a pair of DGVs
> (3236 model) from TRF as the absolute best solution to the problem. He
> explained that he thinks that the Zenith Strombergs can be rebuilt with
> reasonable reliability, but that they will always be subject to coming out
> of tune and that they won't ever earn my confidence the way the Webers
> would. I requested a level of reliability that would allow me to take the
> car on a trip of a few days without having to make carb adjustments or
> worse. The reliabiliity of the rest of the car is easily at this level.
>
> With that lengthy preamble, what is the opinion of the list members on a
> Weber DGV conversion? The motor has an upgraded cam, 9.5 to 1
> compression, port work, headers, electronic ignition, and makes about 145
> hp at the flywheel.
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