Towing + MPG setups
Post Fiend
Joined: Oct 2003
Posts: 9,176
Likes: 4
From: Western Central NV
As for gas mileage the 4180 600 CFM STOCK CARB, is alittle better on gas mileage, than a replacement 4160 600 CFM out of the box. One reason the 4180 has a 2 stage power valve and a few internal things that were for gas mileage.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Just swap the dual stage power valve into the new carb. Then you will be ahead because with the 4160 or even a 4150 you has infinite idle mixture adjustment where on the 4180 you are extremely limited to a lean conition.
Senior User
Joined: Jun 2005
Posts: 176
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From: Temple, TX
Originally Posted by Brad Johnson
With the Crane 353931, DD predicts 366 HP @4500 and 480 lb-ft all the way from idle to 3500 RPM. The torque line on the graph is dead flat across that RPM range.
With the 353901, DD predicts 365 HP @4500 and 490 lb-ft torque from idle to 3500 RPM. Again, the torque line is dead flat.
With the 350901, DD predicts 338 HP @4000 RPM and 515 lb-ft at 2000 RPM. Unfortunately, the torque takes an immediate nose dive and is down to 450 lb-ft by 4000 RPM.
With the 353901, DD predicts 365 HP @4500 and 490 lb-ft torque from idle to 3500 RPM. Again, the torque line is dead flat.
With the 350901, DD predicts 338 HP @4000 RPM and 515 lb-ft at 2000 RPM. Unfortunately, the torque takes an immediate nose dive and is down to 450 lb-ft by 4000 RPM.
I've got a set of headers (1 3/4" I believe, not certain though), dual 2 1/4" exhaust, and a Holley 750 in the truck now. Could I realistically expect numbers like those by swapping in one of the cams you mentioned?
Thanks,
Richard
Elder User
Joined: Jan 2004
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Just out of curiosity, how accurate are Desktop Dyno estimates usually? The only reason I ask is, the claims Edelbrock makes for their performer cam/intake package are nowhere near those numbers.
I've got a set of headers (1 3/4" I believe, not certain though), dual 2 1/4" exhaust, and a Holley 750 in the truck now. Could I realistically expect numbers like those by swapping in one of the cams you mentioned?
I've got a set of headers (1 3/4" I believe, not certain though), dual 2 1/4" exhaust, and a Holley 750 in the truck now. Could I realistically expect numbers like those by swapping in one of the cams you mentioned?
Only as accurate as the input info, especially head flow numbers. Given good info it usually comes within a few percent. However... remember that it's still a sim, and presumes sea-level altitude and a perfect tune. Also, it's crank HP. You have to deduct for driveline losses to get wheel HP.
Also remember that the sim for this thread presumes stock heads. The Edelbrock packages are usually quoted using their aftermarket heads (which aren't bad, by the way). The late 60's factory 429 and 460 specs hovered around 350-360 HP and 450-475 lb-ft torque. You should be able to at least duplicate that, and possibly improve on it, with some specific bolt-ons and careful tuning.
Brad
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More Turbo
Joined: May 2005
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Come to think of it they changed the heads a couple times in the eighties, this engine is older, and has D3VE heads, will this change things at all, or are the numbers still similar.
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Laughing Gas
Joined: Apr 2003
Posts: 837
Likes: 2
From: Minnesota
Originally Posted by kermmydog
I have an 86 F250 4x4 460 C-6 3:55 gears and I can get 9.5-11 MPG on a squeze empty and on the road. Towing our travel trailer about 7,000# I get 6-7 MPG.
I'm toying with the idea of changing over to 4.10's since most of my mileage is towing. If it wasn't such a hassle I'd like to try 3.73's first but might as well go all the way if I'm going to do it. I've even been told I might pick up a little mileage with the stouter gears because the engine wouldn't be working as hard to do the same job.
Brad
Thanks for the input. You've laid out a plan I'd really like to follow when the $$$ are available ... provided we can afford to even drive these things in the future 
Lead_Foot Interesting that you're thinking about getting out of 4.10's and I'm looking to go into them for the same reason ...
Roger
Clyde S Dale, my chestnut brown & tan 5th wheel workhorse is a
1984 F250HD XLT RCLB 4X2 8600 GVW
460 C6 3.55's
68,500 original miles (and counting)
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More Turbo
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I never mentioned a gear change, im happy with my gearing, if i go larger tires i'll go an even lower gear, probably 35's with 4.56 gears.
EDIT my gas mileage is better than i thought, although i still dont know what it is under normal conditions because my mom has been driving my truck for two months, but towing a 6k lb trailer, including stump pulling, and crawling up a few miles in 4L i got 9.5 MPG, im fairly happy with it the way it is.
EDIT my gas mileage is better than i thought, although i still dont know what it is under normal conditions because my mom has been driving my truck for two months, but towing a 6k lb trailer, including stump pulling, and crawling up a few miles in 4L i got 9.5 MPG, im fairly happy with it the way it is.
Laughing Gas
Joined: Apr 2003
Posts: 837
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From: Minnesota
Originally Posted by Lead_Foot
...keep it at as low RPM as possible, what is a good way to set this up ...
Roger
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