Living with Triple Webers
- Thread starter Nicad
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I had triple 45's on a previously owned coupe. Not real difficult to keep sync'ed, but you will need to fool with the jetting to get them right. Believe it or not, the jetting of those carbs is somewhat climate dependent. At least the jets are cheap, so you'll have fun experimenting to get them absolutely perfect.
My old coupe really seemed to come into its' own, with the triple set-up, at higher rpm's (<3000). Low end throttle response was not that great, but no really much difference from the 2 Zeniths.
I still miss the sound of those Webers...it was like a symphony!!!
My old coupe really seemed to come into its' own, with the triple set-up, at higher rpm's (<3000). Low end throttle response was not that great, but no really much difference from the 2 Zeniths.
I still miss the sound of those Webers...it was like a symphony!!!
That is what confuses me is that I would think once you get the jetting set, it would be close to the same for each application and not need further fiddling. I never hear this about the 45's. I guess it is a black art tuning them. Would an Air fuel gauge make this much easier to dial in?. My Corvair has 4 carbs, and has been set and happy since 1983. I have barely driven the car since 1992 and it fires up quickly with nice response and idle. Crude but effective.
Webers and altitude
I think people's experience with sidedrafts varies. Some find them troublesome and I've found them to be very reliable and easy to maintain. A primary factor contributing to that difference is the linkage, with the factory or good tuner linkages being good (e.g. BMW, Korman, Alpina) and the generic aftermarket stuff being horrible.
Altitude and climate: I'm sure they need to be re-jetted/choked for varying altitudes and climate if you want to extract optimum performance. On the other hand, I had a triple DCOE setup (Korman tuned) that lived thru 100 degree summers and snow-bound 0 degree winters, both at sea level and a mile high (Boulder, CO) on a single setup. It was setup for daily street use (slightly smaller chokes with matching jets) which helped significantly when below freezing. It always started right up after a single prod of the throttle, and never required more than perhaps 60 seconds of gentle right foot action to hold an idle on even the coldest days.
Tuning: an AFM can be helpful if you need to play with the tuning although lots of old timers did it by feel and reading plugs. If you need to re-jet, consider buying your jets from Korman as he/they will give you a good starting point and good advice. The Haynes manual is cheap and useful, and get a Synchrometer (German, not the damn Asian copies).
I think people's experience with sidedrafts varies. Some find them troublesome and I've found them to be very reliable and easy to maintain. A primary factor contributing to that difference is the linkage, with the factory or good tuner linkages being good (e.g. BMW, Korman, Alpina) and the generic aftermarket stuff being horrible.
Altitude and climate: I'm sure they need to be re-jetted/choked for varying altitudes and climate if you want to extract optimum performance. On the other hand, I had a triple DCOE setup (Korman tuned) that lived thru 100 degree summers and snow-bound 0 degree winters, both at sea level and a mile high (Boulder, CO) on a single setup. It was setup for daily street use (slightly smaller chokes with matching jets) which helped significantly when below freezing. It always started right up after a single prod of the throttle, and never required more than perhaps 60 seconds of gentle right foot action to hold an idle on even the coldest days.
Tuning: an AFM can be helpful if you need to play with the tuning although lots of old timers did it by feel and reading plugs. If you need to re-jet, consider buying your jets from Korman as he/they will give you a good starting point and good advice. The Haynes manual is cheap and useful, and get a Synchrometer (German, not the damn Asian copies).
Cold start: keep the ignition in good condition (pertronix is a good idea) and you should have no problems. All they need is a quick squirt of fuel down the chokes (1 pump of the pedal) and it should fire right up at almost any reasonable temperature. I've never found it necessary to hookup the cold start circuit (40DCOE's).
IMHO, and throttle response at low/mid rpm is all a function of the chokes and how you size them. If you set it up for best high rpm power, it'll be a little boggy or dull below 3000rpm (fast road cam). If you have a general purpose street grind, or a 3.5l motor, you might be fine above 2k. That's the beauty of the Webers, easy to carry around a 2nd setup that you can swap over in 15min with a screw driver and 1 wrench.
Sidedrafts
Once jetted and tuned properly they require very little adjustment. I think sidedrafts are more of a high-speed carburetor and react differently than downdrafts. From a stop under hard acceleration they need a lot more engine vacuum to fill those 6 throats, but they do sound so good as they gulp air.
Doug
Once jetted and tuned properly they require very little adjustment. I think sidedrafts are more of a high-speed carburetor and react differently than downdrafts. From a stop under hard acceleration they need a lot more engine vacuum to fill those 6 throats, but they do sound so good as they gulp air.
Doug
Bill Riblett
(deceased)
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What nobody has mentioned is that the intake noise is REALLY LOUD!
Instant throttle response is great
Instant throttle response is great
2275xxx
Well-Known Member
In my experience it depends pretty much on the shape of the intake manifolds.
With very straight/direct manifolds à la Alpina (and without the big Alpina airbox) ths sound is very loud.
With S-shaped manifolds of the Viktor Günther type (as used by GS-Tuning) the sound is reasonnably loud, without being agressive, even with filterless open velocity stacks.
the korman intake on my 2002 w/ dual 45 dcoes was loud ... but it was a pleasurable loud. nothing a killer stereo wouldn't handle. of course i was never sure which made it louder ... the 2" exhaust, the headers, the carbs w/ a 316 degree duration + a lot of head work ... or just keeping my foot in it. somehow i think it was all of the above.
piezopaul
Well-Known Member
My best friend told me my triple webers sound like a Ferrari. Good enough for me.- Paul