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A challenge: 20 mpg in a 460/429

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  #61  
Old 09-25-2005, 10:51 PM
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It's the gearing on our trucks. Put higher gearing, auto and cruise control and you should get that kinda mileage.

Then it's not a truck anymore...
 
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  #62  
Old 09-25-2005, 11:49 PM
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I'm surprised people aren't mentioning ignition systems more. Making sure the gas burns completely seems important for both performance and economy. Jacobs and MSD both claim to improve mileage; apparently by providing multiple sparks.

Does the stock ignition spark just once? How do folks find higher energy coils influence power and economy?
 
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  #63  
Old 09-26-2005, 06:56 AM
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Kinda starting over again. Changing jets in my 750 Holley the other day and stripped out a bowl screw thread. Swapped the 750 body for a 600 body reworked to fit the larger 750 throttle plate. Will repair the 750 body but thought I would see 600/750 hybred does. So far idle is down from 850 to 800 and looks like 19 inches of vacuum is now up to 20. Took a short run drivability seemed better possibly a bit rich. Rain prevented reading plugs and checking carb part number might be a 650 body.
 
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  #64  
Old 09-27-2005, 11:55 AM
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mlf72f250's got it right - its all about driving with the lowest revs possible. I remember running out of gas in my 62 beetle. The emergency reserve held about 1 gallon of gas and we covered almost 60 miles (it was about 65 miles to the next station!). We drove at a steady 25 mph in fourth gear - the road was flat. 429/460s are big engines - each cylinder displaces about as much as my old 1100cc VW. Of course what we all need is an economical Hybrid conversion kit for these great trucks, then you could get over 20mpg in town for sure. Sorry i'm dreamin again!
 
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  #65  
Old 09-27-2005, 12:48 PM
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Went down two jets. Too lean going back to what I picked when I modified the carb and run some tests.
 
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  #66  
Old 09-27-2005, 04:11 PM
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What altitude are you at and what are the sizes of the jets you are working with? Also, what size seemed to work best?

Thanks!
 
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  #67  
Old 09-28-2005, 06:37 AM
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Originally Posted by white lincoln
What altitude are you at and what are the sizes of the jets you are working with? Also, what size seemed to work best?

Thanks!
I am at around 800 ft If I remember correctly. Remember this is not a stock 650 Holley. I am back to 66 jets again in the front and I dont believe the main or idle air bleeds are stock. This body was off a hot 84 Mustang I had and was modified for four corner idle along with other mods. This carb body has been ported out so to speak.
 

Last edited by turbo2256; 09-28-2005 at 06:39 AM.
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Old 09-28-2005, 06:45 AM
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Before I get too far into this an exhaust up grade is needed or just banging my head against the wall. Need new shocks this month. I will start exhaust mods next month. First will be just a big time muffler change with stock pipes and manifolds but unlike the factory will be a true 2 1/2" to 3" exhaust.
 

Last edited by turbo2256; 09-28-2005 at 06:47 AM.
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  #69  
Old 09-28-2005, 01:06 PM
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Frgot to mention metering blocks are still 750 versions.
 
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Old 08-26-2008, 10:35 PM
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I know that this is digging up an old thread but I anm curious how close some of you have gotten with your projects. I saw this thread doing a search on something else and read through it 'cause I am doing the same project with my '96.

One thing to note. Even though we may not recover the cost in fuel savings imagine the bragging rights and cool factor of being able to say "I get 20+ MPG with my 460 truck"
 
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  #71  
Old 08-27-2008, 07:37 AM
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What do you consider a truck.

1978 Ranchero with a 429 from a 70 Marquis, C6, 275 gears and it would do 20 on on the interstate at 65 if I kept my foot out of the gas and stayed away from the hills. (That was back when you could buy gas for the 11-1 compression.) That didn't happen very often but even pushing it it would make 17 on a regular basis.

Richard
 
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  #72  
Old 08-27-2008, 12:24 PM
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Originally Posted by 52 F3 View Post
What do you consider a truck.

1978 Ranchero with a 429 from a 70 Marquis, C6, 275 gears and it would do 20 on on the interstate at 65 if I kept my foot out of the gas and stayed away from the hills.
That's really good.. but that vehicle has much better aerodynamics than an F series truck, is lighter, and sits lower to the ground, and all those things factor heavily into milage achievments.
 
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  #73  
Old 08-30-2008, 01:11 PM
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460 don't sip gas, they suck gas.now if you could get it to sip gas
 
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  #74  
Old 08-30-2008, 04:17 PM
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Originally Posted by 460me View Post
460 don't sip gas, they suck gas.now if you could get it to sip gas
That is the whole point of this topic. Some of us want to do what most everyone is trying to tell us can not be done.
 
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  #75  
Old 09-01-2008, 08:48 PM
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phsyics my ***. a 2.50 gear would me impossibe to turn at low revs even for a 460. besides who runs a 429 ranger to work. however that would go down the track good with 4.11's. humm sounds like a project.
 
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