Skip to main content



FOAM air cleaners are dangerous on Webers regardless of tune, but paper ones are fine. K & Ns are maybe OK. What happens in IR intake manifolds is, very strong air pulses go back and forth from carb tip to intake valve, and carburetors are dumb devices: they will meter gas in either direction. So at resonant rpms, you get a small cloud of gas hanging above the carb ram tubes (sometimes called 'reversion'). The cloud soaks foam air cleaners; now all you need is a small backfire on starting and the whole thing bursts into flame. ALWAYS carry a fire extinguisher when running Webers! I've had 2 Weber-fires and my a... was saved the first time by a passing trucker with an extinguisher; the second time I had my own... The nice foam cleaners wound up in a ditch.
Next thing that happens if you don't get the fire out pronto is, the 8 small aux venturis that are in the middle of each carb throat are made of pot-metal, which melts at low temp in the fire and runs down the short intakes to the cylinder. If an intake valve happens to be open, molten metal runs into that cylinder and hardens on the piston. Guess what happens when you try to restart the motor? Time for a couple of new pistons!
FWIW, EFI does not meter fuel in reverse so this doesn't happen; just another little-known advantage of EFI.
quote:
Originally posted by Bosswrench:


FOAM air cleaners are dangerous on Webers regardless of tune, but paper ones are fine. K & Ns are maybe OK. What happens in IR intake manifolds is, very strong air pulses go back and forth from carb tip to intake valve, and carburetors are dumb devices: they will meter gas in either direction. So at resonant rpms, you get a small cloud of gas hanging above the carb ram tubes (sometimes called 'reversion'). The cloud soaks foam air cleaners; now all you need is a small backfire on starting and the whole thing bursts into flame. ALWAYS carry a fire extinguisher when running Webers! I've had 2 Weber-fires and my a... was saved the first time by a passing trucker with an extinguisher; the second time I had my own... The nice foam cleaners wound up in a ditch.
Next thing that happens if you don't get the fire out pronto is, the 8 small aux venturis that are in the middle of each carb throat are made of pot-metal, which melts at low temp in the fire and runs down the short intakes to the cylinder. If an intake valve happens to be open, molten metal runs into that cylinder and hardens on the piston. Guess what happens when you try to restart the motor? Time for a couple of new pistons!
FWIW, EFI does not meter fuel in reverse so this doesn't happen; just another little-known advantage of EFI.


WOW! I can see that happening, I had lots of backfires with the Webers but thank god never a fire. I guess I lucked out. Thanks for posting.
quote:
Originally posted by Mark Charlton:
WOW!

I would only make two changes to that car:

1) black out the chrome trim on the Group4 tail light frames

2) change the ownership into my name

Amazing detail on your car. Those wheels are perfect.

Mark


Hahah, awesome. Yeah, I should black out the tail light trim. That'd be easy.
There are quite a few nice cars out there for sure, many members here have beautiful looking cars. But your car is probably the most unbelievably spectacular car I can ever remember seeing. The car reflects your great taste for what looks good and what works well together. Beyond your highly developed artistic eye, which is not so common, you have the talent to put it all together. You should be very proud of what you have accomplished. Breathtaking.

I happen to agree with Mark Charlton, I think if you black out the chrome around the Grp4 tail lights, the car comes together as one nice symetrical whole. The chrome tail light border looks slightly loud compared to the rest of the car and brings your eye to it...maybe more than what you want. It's just a small detail, but IMO I'd black it out.

But either way your car is a marvel to behold.

Take care,

David
quote:
Originally posted by 4NHOTROD:
I lost a race to a guy that won't race me again and now claims to be the local Pantera king.


burn rubber

Will, it WAS a surprising upset. Even I didn't expect to beat you by such a large margin — especially with my totally-stock car, but I NEVER said I was the "local Pantera King".

Mark
roll on floor
quote:
Originally posted by DeMopuar:
MacMan,

What did you have to do to the hub to get the Centerlock wheels to attach properly? Can you give some details on how you got this done? I really like that on your car -- don't see centerlocks very often on street cars. Looks great!

Mark


Thanks!!! The centerlocks use a hub adaptor. No modification required. I talked to Forgeline at length about strength, etc. and they are extremely confident. The car made 600 hp and I have drag radials out back. No problems. I believe that any of their wheels can be made for the centerlock conversion.

Check out Forgeline's page on the conversion:
http://www.forgeline.com/produ...lock-conversion.html

It's very much worth mentioning that we had to use the "tall" hub adaptor for the front (as well as the rear). The first set of wheels came with the short adaptor that wouldn't clear the spindle.
Post
×
×
×
×
Link copied to your clipboard.
×