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See picture in my gallery.
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Hey Cas...you scare me.
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Has anyone installed the taller velocity stacks on the webers? I've heard it helps the emulsification process while not changing air flow or A/F mixtures. BTW, a clear glass/molded/plexi type riveted scoop is in order - yes, the webers are just that good looking! Would anyone else go for one of these or has anyone seen these besides on a Ferarri? Speed Channel's Victory by Design showcased a Ferarri that had a weber "bubble" for the stacks and personally thought it looked great. Thanks for your thoughts!
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Hello Cracker,
I have 2 1/2 " tall spun aluminum stacks on my Webers. They are also a little wider in diameter than the steel stacks. They seem to work very well and still allow enough clearance under the hood. You can see them in my gallery photos. Show us some pics of the "Weber Bubble". |
TommyBoy,
My stacks measure 3" from base to top so I guess by definition I too have the 2.5 stacks (steel). I'll try to find a picture of the Ferarri bubble I was talking about but I was thinking of having one molded to a S/C spec hood that can simply be revited on. If possible and enough interest a taller version could be made to acomadate taller stacks. I think they look even better taller - kind of like the old CanAm engines with F. Injection stacks. |
Tony et al:
My friend and I had the same discussion about stack height and the possible advantages when we did the engine dyno pulls on my new engine. He recently sent me this chart from the TWM website: http://www.capitalareacobraclub.com/...tack_chart.jpg If you can read the chart, it shows a 5 hp decrease at about 8200 rpm with the tall horns! I use a 6000 rpm rev limiter on my car, so I think I'll just keep my shorter stacks for sure. (I realize that the TWM chart is for their EFI look alikes so I don't know if there is a difference with real Webers or not. I suspect that it would be marginal at best.) From what I understand, the shape of the lip makes more difference than the height. Maybe Cal Metal will read this and chime in. He would know for sure.:) |
Hey fella's with webers - I have just finished syncronizing my carbs and the car runs terrific but had a quick question pertaining to the backfiring (exhaust) upon lifting off throttle. Here I thought I was going to a milder engine, at least in sound vs. the 427 and it sounds more like NASCAR than ever! Kind of cool but wanted to know if everyone else has had a similar experience. The only thing I kind come up with, just to let you know, is that the idle circuits (8) is simply supplying enough fuel to immediately cause the "explosions". Your thoughts are appreciated!
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Tony,
You know my input already having chatted on the phone. My Mustang with Webers pops like the 4th of July when lifting/decelerating, and it is pretty wild going down hills. I run Raven mufflers which are fairly free flowing, so I am anxious to hear if other Weber induction cars have the same as what you and I are experiencing. |
Zimmy:
Don't know much with regard to the short v. long velo stack differences. Phil Remington told me that when he was working at Hilborn Injection, as Chief Engineer, back in the fifties, the prevailing thought was that a most of the air entering the air horns from the top was via the front scoop. They found out later that much of it was coming from the bottom of the engine compartment. The radiused (tulip) velo stack worked the best, as the air would follow the contour of the radius. If the traditional stack, which has a sharp edge, was used, the air would break away once it hit the leading edge of the stack. That's why you will see the Scarab cars with the radiused stacks. Regarding the backfiring issue, I would suspect an exhaust leak. |
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