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Old 04-19-2012, 08:37 AM   #11 (permalink)
mikehallbackhoe
 
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I thought the warmer the air, the better the mpg. are you saying that anything over 120 degrees will hurt mpg? one thing I have done is make sure that I didn't damage anything, so I could put it back if I had to. I will watch my mpg as the weather warms up and see if it gets better or worse.

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Old 04-19-2012, 12:32 PM   #12 (permalink)
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http://ecomodder.com/forum/showthrea...akes-1755.html

and

http://ecomodder.com/forum/showthrea...a-21038-3.html

They all seemed to say that they saw a drop off if the air got to hot and others have said the same thing as they get above 130F or so and that is even with fuel injection which is going to be able to lean back the fuel to air ratio as the air gets warmer, your carburetor is not designed to cut back the amount of fuel it's feeding in if the air temp is to high so at some point your engine is going to start running to rich if you feed it to hot of air.
Either way, if you read some of those threads you will see that a number of people are trying to build more or less the same warm air intake that your car had new from the factory because a non regulated warm air intake just didn't cut it.
Also, gasoline can start to boil at 100F altho the boiling point is 100F to 400F... one of the few things that they don't give a exact boiling point for, so do run the risk of vapor lock if you get the carburetor to hot as well.
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Old 04-22-2012, 11:32 PM   #13 (permalink)
mikehallbackhoe
 
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I blocked the main intake, and tried just running the 1 3/8" manifold heat tube. temp outside 85 degrees. car stumbled anything over 1500 rpm. unplugged the main intake tube, now running both tubes full time . car runs fine. got 56 mpg in 310 miles. 150 of those miles on freeway at 65- 70 mph. passenger window open.wife needed air.

Last edited by mikehallbackhoe; 04-23-2012 at 12:21 AM..
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Old 04-22-2012, 11:51 PM   #14 (permalink)
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That is some quality info, Mike...thanks!

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New personnal best 'all-city' tank June '08 ... 61.9 mpg!
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