by "aberson Bresident of the FullyAssed Committe" (emaxxbl)
Published 11/28/2017 at 15:14
by "aberson Bresident of the FullyAssed Committe" (emaxxbl)
Published 11/28/2017 at 15:14
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STARS: 4
3" long stacks would look good hanging off the side of the alfa’s webers. I don’t care if they’ll ruin all the low end grunt, looks are all that matters these days.
Now if you’ll excuse me I’ll be busy.
"RamblinRover Luxury-Yacht" (ramblininexile)
11/28/2017 at 15:35, STARS: 1
How will they ruin the low end grunt? Long stacks = long oscillating body = oscillation at low Rs. Won’t they instead make a low end roar-howl? A rowrl?
More power at low Rs, and if the peak isn’t low enough, you can go longer.
"cletus44 aka Clayton Seams" (cletus44)
11/28/2017 at 15:51, STARS: 1
Looks are all that matters. I want a tunnel ram on the corvette for the same reason.
"I have another burner, try to guess it!" (ihaveanotherburner)
11/28/2017 at 15:52, STARS: 0
I think the extra volume decreases air pressure thus reducing velocity. Or something like that, I’ve been told.
"RamblinRover Luxury-Yacht" (ramblininexile)
11/28/2017 at 16:02, STARS: 1
The length resonates constructively at the point that effectively the “clap” (the sudden pressure shift) from the valve closing has time to travel to the end of the tube and rebound right at the time the valve opens again. With a long stack, this happens at low Rs, with a short stack, this happens at high Rs.
With the stack being bigger than it needs to be, it would alter the effective length of the resonating column of air somewhat and potentially waste some of the energy otherwise used in the resonating pulse. But not much.
With a really, really long stack, you could run into a high enough Reynolds number for serious drag, but I don’t think that’s the case here. There’s also the sense in which a very long run with filtration at the other end might experience lag in mass flow and “thin out”, if that’s what you’re thinking of, but again, not really a thing with velocity stacks, tall or otherwise.
"aberson Bresident of the FullyAssed Committe" (emaxxbl)
11/28/2017 at 17:26, STARS: 0
"RamblinRover Luxury-Yacht" (ramblininexile)
11/28/2017 at 17:28, STARS: 1
I’m a wizard, Harry.
"f86sabre" (f86sabre)
11/28/2017 at 18:57, STARS: 0
The Mini we imported has a Weber 45DCOE carb. A mod the previous owner did. Seems like way more carb than a 998cc engine needs. I also have no clue on how to tune it. Runs ok at speed, but low end is a mess. No stacks, just a filter thing
"aberson Bresident of the FullyAssed Committe" (emaxxbl)
11/28/2017 at 19:29, STARS: 1
A 45 does seem quite large especially if it’s a stock engine. As for tuning I’d start by getting it warmed up and then leaning out the idle mixture screws 1/4 turn at a time, with a small pause in between turns to let the mixture stabilize, until it’s barely idling (600-700 rpm) or until it start consistently puffing out of the carb, the puffing means it’s running too lean, then speed the idle back up if it holds a steady and smooth idle take the car out for a drive varying load conditions. You should have an almost seamless transition between the idle and main circuit with minimal to no puffing (assuming that the main circuit is tuned correctly).
this guide has helped me a lot.
"f86sabre" (f86sabre)
11/28/2017 at 21:42, STARS: 1
Even they warned about using too big a carb on a small engine. The comments about the ignition system are also interesting.