Weber 32/36DGV verses the Weber 38DGES

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(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
(pooh bah) Thu Aug 25 2005 12:06 AM Gnarly4X (carpal tunnel) Thu Aug 25 2005 12:45 PM yodta (pooh bah) Fri Aug 26 2005 01:06 AM Gnarly4X (carpal tunnel) Fri Aug 26 2005 12:21 PM yodta (pooh bah) Fri Aug 26 2005 02:25 PM yodta (pooh bah) Sun Aug 28 2005 01:45 PM oh, I'm sorry gnarls, I must have misread your response -- kinda confused me for a second when you said less rich, because I was thinking less air would make the circuit richer, as in more fuel in the mixture, which would be the opposite of what I think I'm experiencing with the pinging. so if the mix is richer, why does it ping? engines ping when they're lean, right? I thought increasing the fuel delivery "cools" the cylinder and can stop pinging. Re: Weber 32/36DGV verses the Weber 38DGES Quote: oh, I'm sorry gnarls, I must have misread your response -- kinda confused me for a second when you said less rich, because I was thinking less air would make the circuit richer, as in more fuel in the mixture, which would be the opposite of what I think I'm experiencing with the pinging. so if the mix is richer, why does it ping? engines ping when they're lean, right? I thought increasing the fuel delivery "cools" the cylinder and can stop pinging. Remember, the carb is "mixing" the fuel/air. If the air temp is higher, there is only so much fuel it can hold when it gets to the cylinders. So when it's hotter out the air won't hold as much fuel, so the engine get a slighty leaner mixture and it pings. That's why EFI is great, it's sensors can "correct" and reduce the timing and control other factors simultaneously. But, I think the warmer ambient air temp increases the cylinder temp and pressure, so if your octane rating is a tad too low, you get ping. That's why when I put in 91 octane (better anti-ping), it went away. At least that is my non-technical, pee-brain understanding?? Gnarls. Re: Weber 32/36DGV verses the Weber 38DGES see, I knew there was an explanation -- I totally missed the fact that the air is carrying the fuel. Re: Weber 32/36DGV verses the Weber 38DGES Quote: see, I knew there was an explanation -- I totally missed the fact that the air is carrying the fuel. There is something you can try... when the cylinder pressure goes up, it raises the temp and the spark splug stays hotter. You can try going down one or two heat ranges on your spark plug. That may eliminate or reduce the pre-ignition. My 1967 Corvette 327CU was built & tricked and I had to go down to a cold plug to eliminate the pinging. Just a thought. Gnarls. Re: Weber 32/36DGV verses the Weber 38DGES hmmm. damn, that's a great idea Gnarls. the timing & jetting do feel good at this point, it's just the pinging under load that's bothering me. you talking about the heat -- now that I think about it, this may be due to the lack of the EGR system which was removed at the time of the Weber install. I was reading in the FSM that the EGR system helps cool the engine as well. Re: Weber 32/36DGV verses the Weber 38DGES Gnarls, how do I get a cooler plug? I stopped by a local Pep Boys while out running errands, and the guy told me "he doesn't know how to look that up" and asked around the shop. nobody knew. 63 of 88
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Weber 32/36DGV verses the Weber 38DGES

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