Weber 32/36DGV verses the Weber 38DGES

(carpal tunnel)
Sat Aug 20 2005
02:11 PM
yodta
(pooh bah)
Wed Aug 24 2005
11:29 AM
Gnarly4X
(carpal tunnel)
Wed Aug 24 2005
01:19 PM
yodta
(pooh bah)
Wed Aug 24 2005
03:14 PM
Gnarly4X
(carpal tunnel)
Wed Aug 24 2005
07:42 PM
Air jets won't delay the timing of the main circuit, just alter the mix at higher velocity. Try around 145/175 first,then go up with the
air jet if you have to....
Sarge
Re: Weber 32/36DGV verses the Weber 38DGES
this pinging problem seems to be related to air temperature. it really only does it when the engine's warmed up on hot days, so
I'm thinking it's an air charge problem.
I need to find a way to get cooler air directed to the carb. the Ramflo definitely works better than the stock air cleaner, but I'm just
sucking in hot air. when I think about it though, wouldn't that richen the mixture since hot air is less dense than cold? it would be
less air coming in, right, which in theory should richen the mix?
Re: Weber 32/36DGV verses the Weber 38DGES
Quote:
this pinging problem seems to be related to air temperature. it really only does it when the engine's warmed up on
hot days, so I'm thinking it's an air charge problem.
I need to find a way to get cooler air directed to the carb. the Ramflo definitely works better than the stock air
cleaner, but I'm just sucking in hot air. when I think about it though, wouldn't that richen the mixture since hot air is
less dense than cold? it would be less air coming in, right, which in theory should richen the mix?
You are correct, the warmer the intake air the less rich the air/fuel mixture should be. I have a same problem here in Arizona.
During the winter months I could use 89 octane, but when summer hits and the ambient air temps get up to 100+ degrees, I
noticed a little pinging, so I switched to 91 octane. After than, I actually backed off the ignition timing a couple degrees and went
back to 89 octane.
Gnarls.
Re: Weber 32/36DGV verses the Weber 38DGES
but wouldn't warm air being less dense richen the mix because there's less air?
Re: Weber 32/36DGV verses the Weber 38DGES
Quote:
but wouldn't warm air being less dense richen the mix because there's less air?
Yep... by jove I think 'e's got IT!!
As air temperature decreases, air density/air volume becomes greater, resulting in leaner air/fuel mixtures. This creates higher
cylinder pressures/temperatures. So, fuel delivery should be increased - richened. That's why you have to choke the shit out of
an engine that's very cold.
As ambient air temperature increases, air density decreases, as does intake volume, and fuel delivery should be decreased.
The other factor that effects the stoichoimetric number is higher altitude, the higher the altitude, the lower cylinder pressure
becomes. And the cylinder temperature decreases. You need to adjust jetting or air/fuel mixtures in an effort to put more air back
into the engine. That's essentially what the HAC does on the Toyota carb'd engines.
Gnarls.
yodta Re: Weber 32/36DGV verses the Weber 38DGES
62 of 88