Ford 300 build for economy, not necesarily power

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77UtilityTruck
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Ford 300 build for economy, not necesarily power

Post #1 by 77UtilityTruck » Thu Aug 09, 2018 10:06 am

So.... thinking about putting my 300 in a different vehicle. I no longer own the 77 utility truck that I originally bought it for and it's sitting under a tarp doing nothing. It's a 1968 300, all stock right now, but I have a cam (torque economy profile, I can look up exactly which one I bought), and Offenhauser DP intake and headers for it.

The vehicle I'm putting it in is a bit lighter than most ford trucks -- maybe light an older F100 -- it's a 1967 Landrover 109 station wagon. Around 3700lbs empty. It's original engine was a 2.6 liter straight six with 95HP and 140 torque or so. So even a completely stock 300 would beat it. I'm wanting a bit more torque and horsepower than the 2.6 had, but not too much, as I don't want to start breaking rover components (some are being upgraded regardless, as even the stock engine could break them). I'd like it to get as good of gas mileage as possible with that engine though (for something shaped as aerodymanically as a pile of bricks :). Am I better off sticking with the single barrel carb, or if I put a four barel on the DP intake, will that actually help because I'll be on the primaries almost all of the time instead of secondaries? (I'm good a driving with a light foot too). And will the cam help, even if I keep the single barrel carb? It will be used in cold weather (colorado mountain winter) a lot, so carb icing will be a concern, and I know that's an issue with the headers vs the stock exhaust/intake manifold.

Thanks for the ideas.

Zeke

1986F150six
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Re: Ford 300 build for economy, not necesarily power

Post #2 by 1986F150six » Thu Aug 09, 2018 10:21 am

Hello,

My SWB 1986 F150 [~3750#] with 4.9L (mostly) stock engine, 4 speed manual O.D. transmission and 3.08 rear gears returns 17 mpg in urban driving [stop signs, lights, etc.] and 22-25 mpg on the highway @ 55-60 mph. I drive like an old man and short shift as much as possible, w/o lugging the engine.

pmuller9
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Re: Ford 300 build for economy, not necesarily power

Post #3 by pmuller9 » Thu Aug 09, 2018 10:29 am

Are you going to rebuild the engine?

Lazy JW
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Re: Ford 300 build for economy, not necesarily power

Post #4 by Lazy JW » Thu Aug 09, 2018 10:49 am

77UtilityTruck wrote: ...It will be used in cold weather (colorado mountain winter) a lot, so carb icing will be a concern...


I would definitely keep the stock one-barrel carburetor and stock exhaust manifold for this application. Make certain that the hot air stove and all related parts of the air cleaner are intact and fully functional. I have personally observed some mighty impressive carburetor icing on these engines, particularly at about 35° F.
Have fun!
Joe
"The White OX" 1974 F-350 300-6, Stock single exhaust, Carter YF, T-18A, Dana70 w/4.11, Flatbed dually w/dump bed. "Where no oxen are, the crib is clean, but much increase is by the strength of the ox" (Proverbs 14:4)
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77UtilityTruck
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Re: Ford 300 build for economy, not necesarily power

Post #5 by 77UtilityTruck » Thu Aug 09, 2018 12:34 pm

pmuller9 wrote:Are you going to rebuild the engine?


Maybe. It's got about 120k miles on it now, and was running good when removed from the ford, to my knowledge. Will at least do a compression test on it, and if I do put in the cam, I'll put in new lifters and gears.

pmuller9
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Re: Ford 300 build for economy, not necesarily power

Post #6 by pmuller9 » Thu Aug 09, 2018 3:05 pm

77UtilityTruck wrote:
pmuller9 wrote:Are you going to rebuild the engine?


Maybe. It's got about 120k miles on it now, and was running good when removed from the ford, to my knowledge. Will at least do a compression test on it, and if I do put in the cam, I'll put in new lifters and gears.


The reason why I'm asking is if your elevation is around 5000 feet and you don't plan on driving down to much lower elevations, you can certainly raise your compression ratio a lot which will help with torque and fuel economy.

77UtilityTruck
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Re: Ford 300 build for economy, not necesarily power

Post #7 by 77UtilityTruck » Thu Aug 09, 2018 10:45 pm

pmuller9 wrote:
The reason why I'm asking is if your elevation is around 5000 feet and you don't plan on driving down to much lower elevations, you can certainly raise your compression ratio a lot which will help with torque and fuel economy.


5000 feet would be the lowest -- more often in the 7 to 10,000 feet elevation range. My house is at 9,300 ft. How do you raise the compression ratio? Different pistons, or longer rods or ??

pmuller9
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Re: Ford 300 build for economy, not necesarily power

Post #8 by pmuller9 » Thu Aug 09, 2018 10:59 pm

Different pistons.
The 1965 to 1968 connecting rods use a .912" piston pin so you can use the Ford 351 V8 pistons.
There are a lot to choose from.

Need to know the specs on the new camshaft.
Which cam is it?

77UtilityTruck
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Re: Ford 300 build for economy, not necesarily power

Post #9 by 77UtilityTruck » Thu Aug 09, 2018 11:10 pm

I think the cam that I have is the 252H

77UtilityTruck
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Re: Ford 300 build for economy, not necesarily power

Post #10 by 77UtilityTruck » Sat Aug 11, 2018 2:32 pm

77UtilityTruck wrote:I think the cam that I have is the 252H

Yes, CompCams High Energy 252H

Mdixon300f100
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Re: Ford 300 build for economy, not necesarily power

Post #11 by Mdixon300f100 » Sat Aug 11, 2018 7:12 pm

I've had the yfa on my 1980 f100 ice up to the point it stalled at idle, or whenever I disengaged the clutch with the factory manifolds. Given it was snowing so the ambient humidity was 100%. It was never a problem with cold, clear skies. You can plumb the offy manifold for heat with an adaptor plate and using the heater core hoses instead of the factory exhaust stove system. I've seen them for sale, can't remember exactly where though. Good if your switching to efi manifolds, or the headers you mentioned having.

pmuller9
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Re: Ford 300 build for economy, not necesarily power

Post #12 by pmuller9 » Sat Aug 11, 2018 10:46 pm

77UtilityTruck wrote:
77UtilityTruck wrote:I think the cam that I have is the 252H

Yes, CompCams High Energy 252H


The stock cam is a 268 so the 252 will bring the dynamic compression up.

What octane gas do you use?

77UtilityTruck
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Re: Ford 300 build for economy, not necesarily power

Post #13 by 77UtilityTruck » Mon Aug 13, 2018 9:54 am

pmuller9 wrote:
What octane gas do you use?


85 in all my other vehicles.

Lazy JW
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Re: Ford 300 build for economy, not necesarily power

Post #14 by Lazy JW » Mon Aug 13, 2018 6:23 pm

Mdixon300f100 wrote:I've had the yfa on my 1980 f100 ice up to the point it stalled at idle, or whenever I disengaged the clutch with the factory manifolds. Given it was snowing so the ambient humidity was 100%. It was never a problem with cold, clear skies. You can plumb the offy manifold for heat with an adaptor plate and using the heater core hoses instead of the factory exhaust stove system. I've seen them for sale, can't remember exactly where though. Good if your switching to efi manifolds, or the headers you mentioned having.


I've had the very same thing happen with stock manifolds; that's because it isn't the manifolds that lead to icing, it is the lack of heat to the air cleaner. Once I restored the factory hot air stove and all of the plumbing/tubing, etc. it never happened again. Around 32° - 35° with high humidity is prime condition for icing.
"The White OX" 1974 F-350 300-6, Stock single exhaust, Carter YF, T-18A, Dana70 w/4.11, Flatbed dually w/dump bed. "Where no oxen are, the crib is clean, but much increase is by the strength of the ox" (Proverbs 14:4)
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Re: Ford 300 build for economy, not necesarily power

Post #15 by Mdixon300f100 » Mon Aug 13, 2018 7:39 pm

Makes sense, I never had the air cleaner heat pipe on mine. Wasn't there when I bought it.

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