Humidity - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**bigmac73** · 08-28-2013, 02:40 PM

Any ideas if High humidty will affect performance and Air/Fuel mixture?
humid as hell this morning truck seemed a little sluggish

**steelhorse** · 08-28-2013, 03:09 PM

Yes it will. You are adding more water to the fuel mixture and water doesn't burn to well

alsriv2 · 08-28-2013, 03:37 PM

The old J57 turbines on the B52 aircraft loved humidity and water. Seemed to make the compression go from 10,000lbs of thrust to around 12,500lbs (per engine) when they injected water directly into the inlets of those engines during take-off. Unfortunately the aircraft only held 1200 gallons and would use that entire 1200 in the first few moments of take-off.

Too bad internal compression engines don't like hot humid weather!

piecesparts · 08-28-2013, 03:46 PM

Look at it like this. For more HP, many tractor pullers run a water/alchohol injection system. That is mostly on a diesel vehicle, but in the late 70s and early 80s there were water injection system for the enimic cars that were out there. The expansion of a water droplet into a steam cloud is a lot of BTUs of power.

slow-1 · 08-28-2013, 03:50 PM

Quote:

Originally Posted by steelhorse

Yes it will. You are adding more water to the fuel mixture and water doesn't burn to well

Plus more water, less air.

**WIDESIDE72** · 08-28-2013, 04:34 PM

It will make more power but you have to tune for it.
Posted via Mobile Device

**bigmac73** · 08-29-2013, 11:05 AM

well i think the idea of water and alcohol injection is to lower intake tempertures and to increase combustion , as far as everyday weather humidity is what i am talking about, just seemed like the chevy did not run as good the other morning compaired to most morning on the way to work, like something was holding it back or there was a drag or something

**steelhorse** · 08-29-2013, 02:30 PM

Too much alcohol in today's gas,the truck was drunk.

oklalawnboy · 08-29-2013, 05:28 PM

I always think of it this way. Humid air is thicker and your truck can't swallow as much as thin air. Your truck will run richer with the thicker air.

sprint_9 · 08-29-2013, 06:58 PM

Any naturally aspirated engine that uses air in its combustion process will not make more power with less air density.

Air density decreases with increasing altitude, as does air pressure. It also changes with variation in temperature or humidity.

jhwkns · 08-29-2013, 07:09 PM

It's humid here today. The truck ran ok, but my A/C iced up.

08-28-2013, 02:40 PM	#1
bigmac73 Senior Member Join Date: Mar 2012 Location: Chesapeake, Va Posts: 1,275	Humidity Any ideas if High humidty will affect performance and Air/Fuel mixture? humid as hell this morning truck seemed a little sluggish __________________ Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks

08-28-2013, 03:09 PM	#2
steelhorse Senior Member Join Date: Apr 2008 Location: Franklinton NC Posts: 1,309	Re: Humidity Yes it will. You are adding more water to the fuel mixture and water doesn't burn to well

08-28-2013, 03:37 PM	#3
alsriv2 Registered User Join Date: Sep 2010 Location: Formerly MD and San Diego, now loving life in Arizona Posts: 1,636	Re: Humidity The old J57 turbines on the B52 aircraft loved humidity and water. Seemed to make the compression go from 10,000lbs of thrust to around 12,500lbs (per engine) when they injected water directly into the inlets of those engines during take-off. Unfortunately the aircraft only held 1200 gallons and would use that entire 1200 in the first few moments of take-off. Too bad internal compression engines don't like hot humid weather! __________________ Alan 2012 Ram 3500 Dually Crew Cab 6.7 Cummins 2014 Palomino Columbus 340RK 5th wheel '69 Chevy C10 396BB

08-28-2013, 03:46 PM	#4
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: Humidity Look at it like this. For more HP, many tractor pullers run a water/alchohol injection system. That is mostly on a diesel vehicle, but in the late 70s and early 80s there were water injection system for the enimic cars that were out there. The expansion of a water droplet into a steam cloud is a lot of BTUs of power. __________________ Frank

08-28-2013, 04:34 PM	#6
WIDESIDE72 Senior Member Join Date: Aug 2008 Location: Cedar Park, Texas Posts: 7,500	Re: Humidity It will make more power but you have to tune for it. Posted via Mobile Device

08-29-2013, 11:05 AM	#7
bigmac73 Senior Member Join Date: Mar 2012 Location: Chesapeake, Va Posts: 1,275	Re: Humidity well i think the idea of water and alcohol injection is to lower intake tempertures and to increase combustion , as far as everyday weather humidity is what i am talking about, just seemed like the chevy did not run as good the other morning compaired to most morning on the way to work, like something was holding it back or there was a drag or something __________________ Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks

08-29-2013, 02:30 PM	#8
steelhorse Senior Member Join Date: Apr 2008 Location: Franklinton NC Posts: 1,309	Re: Humidity Too much alcohol in today's gas,the truck was drunk.

08-29-2013, 05:28 PM	#9
oklalawnboy Registered User Join Date: Jan 2012 Location: Glencoe Alabama Posts: 510	Re: Humidity I always think of it this way. Humid air is thicker and your truck can't swallow as much as thin air. Your truck will run richer with the thicker air. __________________ 72 Cheyenne super 10 08 3500 HD 4dr dually 12 ford flex (wifes ride) 76 Monte Carlo 83 Chevy short wide Silverado 96 Mazda Miata, 2000 Allegro Bus

08-29-2013, 06:58 PM	#10
sprint_9 Registered User Join Date: Nov 2012 Location: 9 Posts: 863	Re: Humidity Any naturally aspirated engine that uses air in its combustion process will not make more power with less air density. Air density decreases with increasing altitude, as does air pressure. It also changes with variation in temperature or humidity.

08-29-2013, 07:09 PM	#11
jhwkns Registered Cruiser Join Date: May 2002 Location: Las Vegas NV Posts: 2,230	Re: Humidity It's humid here today. The truck ran ok, but my A/C iced up. __________________ I intend to live forever. So far, so good.



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