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MPG truck 300 efi build cam etc. 
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Post MPG truck 300 efi build cam etc.
Need deas for my new motor build a f150 efi 300 six build for the best possible MPG low end mid power. i will start the first idea and would like to know if a zero or better deck and more compression would improve combustion and is this mod in tune with being computer friendly?


Wed Dec 22, 2010 1:19 pm
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Post Re: MPG truck 300 efi build cam etc.
sam2007 wrote:
Need deas for my new motor build a f150 efi 300 six build for the best possible MPG low end mid power. i will start the first idea and would like to know if a zero or better deck and more compression would improve combustion and is this mod in tune with being computer friendly?


I "think" it is. No, I haven't done this on an EFI engine, but I did set the deck height on my TorqueMotor® with the pistons coming OUT of the hole about .007".

Low rpm is where tight quench does the most good, and low rpm part throttle will definitely benefit from increased compression.

Increased compression doesn't really cause trouble until you start cramming the cylinders full.

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Wed Dec 22, 2010 2:06 pm
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Post Re: MPG truck 300 efi build cam etc.
Probably more to be gained from drivetrain optimization, aero cleanup, low resistance tires, reduced parasitic losses etc. than from engine mods but if I had to pick a list of engine mods:

Cleanup the ports and bowls, cc and polish the chambers, profile the guide bosses and Thermactor bumps but no major porting. 3 angle valve job with back-cut inlets, stock sized valves
High-flow catalytic converter and 2.5" low restriction exhaust
Convert to roller cam and roller rockers. I'd probably have Crower grind a duplicate of their 19211 except contoured for roller followers. Install with a Cloyes adjustable gearset and play with advancing the cam to straight up vs. retarded 4° to see which produced better results.

It would probably improve economy almost as much as going to hard skinny tires and swapping to synthetic lubes in the tranny and diff. :roll:

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Wed Dec 22, 2010 3:35 pm
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Post Re: MPG truck 300 efi build cam etc.
StrangeRanger wrote:
Probably more to be gained from drivetrain optimization, aero cleanup, low resistance tires, reduced parasitic losses etc. than from engine mods but if I had to pick a list of engine mods:

Cleanup the ports and bowls, cc and polish the chambers, profile the guide bosses and Thermactor bumps but no major porting. 3 angle valve job with back-cut inlets, stock sized valves
High-flow catalytic converter and 2.5" low restriction exhaust
Convert to roller cam and roller rockers. I'd probably have Crower grind a duplicate of their 19211 except contoured for roller followers. Install with a Cloyes adjustable gearset and play with advancing the cam to straight up vs. retarded 4° to see which produced better results.

It would probably improve economy almost as much as going to hard skinny tires and swapping to synthetic lubes in the tranny and diff. :roll:

Do it all.

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Wed Dec 22, 2010 3:50 pm
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Post Re: MPG truck 300 efi build cam etc.
"...swapping to synthetic lubes in the tranny and diff. :roll:" Probably the most ignored maintenance items on a vehicle. X2 on the suggestion.

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Wed Dec 22, 2010 4:07 pm
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Post Re: MPG truck 300 efi build cam etc.
Yes this is all in the plan with the drive tires etc. would syn. tranny fluid work with a mazda manuel 5 speed what brand/etc. is used for this .standard is ATF i think? thanks .the roller setup $ for the project will not allow ,has anyone found an improvment to the stock efi head chamber design ?


Wed Dec 22, 2010 4:45 pm
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Post Re: MPG truck 300 efi build cam etc.
The Mazdog tranny uses ATF. Substitute any synthetic ATF such as Mobil 1 ATF or if you want a gear lube designed specifically for manual trannies which require ATF look at Royal Purple Synchromax. There are yet higher tech fluids available but your application comes nowhere near justifying the cost

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1996 F-150 (tow missile)
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1982 Tiga Formula Ford (SCCA racecar)
2013 Hyundai Elantra Coupe (daily driver)


Wed Dec 22, 2010 5:17 pm
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Post Re: MPG truck 300 efi build cam etc.
got the PM.

I was gone a pretty long time. (taking a break)

when building efficiency more compression and tight quench can help but the limiting factor is still the head...best MPG I have gotten to date has been a pretty consistent 24mpg and 20 city but its taken alot and some driving skill to pull it off


Wed Dec 22, 2010 11:53 pm
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Post Re: MPG truck 300 efi build cam etc.
Driving habits play a HUGE factor in MPG.

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1974 Ford F-250, Turbocharged and Intercooled 300, Megasquirt Fuel Injection and Ignition control, EDIS, 7.8:1 compression, Harland Sharp roller rockers, Crane 284/272 cam, mild port/polish carb head - 194/1.60 valves, EFI manifolds into turbo - 3.5 inch to muffler - dual 3 inch out the back.


Thu Dec 23, 2010 2:01 am
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Post Re: MPG truck 300 efi build cam etc.
hmm not looking forward to porting any more of these iron blocks after a very painfull experience with iron chip in the eye, :oops: emergency room bill.


Thu Dec 23, 2010 3:04 am
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Post Re: MPG truck 300 efi build cam etc.
for me the best MPG in the city is from short shifting....

with 3.08 gears and the M5OD I do this...

As soon as I let out the clutch in 1st gear and the truck moves a few feet I hit 2nd. Usually its at 5mph when I hit 2nd. Shift into 3rd at 12mph and into 4th at 20mph

sure its a slug but the truck doesnt seem to mind at all...doesnt grumble at all about it into 3rd at 10mph and then the truck growls a tad but it quickly is gone. now it is like granpa going to church slow but hey whatever

now shifting rather normal like into 2nd at 15mph and into 3rd at 25mph and into 4th at 35mph then mileage drops to 18mpg or less.. as you are wasting forward momentum with the rise in rpm

shift at higher rpm doesnt seem to affect mpg as much either...I have tried shifting at into 2nd at 20, into 3rd at 40mph, into 4th at 60mph and although it gets there quicker it just doesnt seem as effective

I am in no hurry to get anywhere....

Now I will say with a load you cannot short shift that low of an mph. well at least my truck you cant...it just wont go


Thu Dec 23, 2010 7:43 am
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Post Re: MPG truck 300 efi build cam etc.
Needless braking is one a lot of people don't realize hurts you MPG. The more you brake, the more fuel it takes to get you back up to that speed. You brake and then make up for the heat loss in the brakes and the slower movement of the vehicle by giving it more fuel to get back up to speed. If you just let off the throttle and coast, the only loss in energy is the rolling resistance of the vehicle (bearings, gears, ring/cylinder friction, engine pumping of air and exhaust, fluids, tires on ground, etc etc), which is inevitable. If you time lights and slower traffic, you can drive without the brakes and save a lot of fuel.

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1974 Ford F-250, Turbocharged and Intercooled 300, Megasquirt Fuel Injection and Ignition control, EDIS, 7.8:1 compression, Harland Sharp roller rockers, Crane 284/272 cam, mild port/polish carb head - 194/1.60 valves, EFI manifolds into turbo - 3.5 inch to muffler - dual 3 inch out the back.


Thu Dec 23, 2010 10:22 am
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Post Re: MPG truck 300 efi build cam etc.
good point

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Thu Dec 23, 2010 12:41 pm
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Post Re: MPG truck 300 efi build cam etc.
What MaxRat described is "progressive" shifting to a trucker. Get through the lower gears quickly at low speeds and save the "stretch" for the top holes.

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'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.


Thu Dec 23, 2010 5:26 pm
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Post Re: MPG truck 300 efi build cam etc.
yea and I am light on the brakes....always have been... I coast alot with room to spare that way I can maintain speed rather than slow too much.

When I need to brake I lightly pump then rather than the last minute plow effort. maybe this is why pad usually last me 10 years or more?

brakes are something I rarely need to change...


Thu Dec 23, 2010 9:31 pm
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