Jerry & Gerry, our pets (dogs), Byron, Coco
1976 Monaco, 440 ci. Dodge Sportsman chassis
Retro Cruiser wrote:
Too many unknown variables. Give me rear tire diameter and current rpm at 60 mph and we can get close...
I have a buddy with a 79 class A. He can run 65 pretty comfortably. Drive train same as mine (440, torque flite, low a** gears ) I always figured the difference was the class A's taller tires. (19 or 19.5 wheels vs. 16.5 wheels) Mine will go 65, but it's ugly..
Too many unknown variables. Give me rear tire diameter and current rpm at 60 mph and we can get close...
I have a buddy with a 79 class A. He can run 65 pretty comfortably. Drive train same as mine (440, torque flite, low a** gears ) I always figured the difference was the class A's taller tires. (19 or 19.5 wheels vs. 16.5 wheels) Mine will go 65, but it's ugly..
There is not really a monsterous diff in the tire height/diameter/rollout between a 16 to a 19.5. The major diff there between those tires is the load carrying capacity.
On the up side, I can surprise people leaving stoplights!
I'll measure them both next time I see him. Interesting to see..
BTW Thanks to the forum for the Checking propane level with hot water trick.
Wife's coffee mug filled with water in the micro for 1 minute and I know excatly how much propane I have! Brilliant!!
Retro Cruiser wrote:
You may be right Boondocker, I've never pulled a tape on the two to check the actual difference of tire height. That was just my initial thought.
I'll measure them both next time I see him. Interesting to see..
BTW Thanks to the forum for the Checking propane level with hot water trick.
Wife's coffee mug filled with water in the micro for 1 minute and I know excatly how much propane I have! Brilliant!!
You may be right Boondocker, I've never pulled a tape on the two to check the actual difference of tire height. That was just my initial thought.
I'll measure them both next time I see him. Interesting to see..
BTW Thanks to the forum for the Checking propane level with hot water trick.
Wife's coffee mug filled with water in the micro for 1 minute and I know excatly how much propane I have! Brilliant!!
RC .... the way most tires are measured now is "rollout". They will give the revs per mile ... which IMO is a way way more accurate way of comparison.
RUN that propane "check" by me ! I am using a 100 lb cylinder to heat a section of my barn and I would like to keep track of the usage.
timmac wrote:
MasterBoondocker said > EFI & OD trans, lots of $$$ little fuel econ, tweaking carb is better.........Fuel inject system is a better fuel management than a carb, carbs can vapor lock, poor performance in high altitudes, burns more dirty than a EFI, carbs are ok at the race track or for small motors like generators, lawn mowers, etc, but cars/trucks/rv's are better suited for EFI, will get better mpg and burns better and cleaner, motors have proven to last longer with EFI over carbs...
MasterBoondocker said > EFI & OD trans, lots of $$$ little fuel econ, tweaking carb is better.........Fuel inject system is a better fuel management than a carb, carbs can vapor lock, poor performance in high altitudes, burns more dirty than a EFI, carbs are ok at the race track or for small motors like generators, lawn mowers, etc, but cars/trucks/rv's are better suited for EFI, will get better mpg and burns better and cleaner, motors have proven to last longer with EFI over carbs...
Mac-ster ..... ah yes -- the direct port FI is bester in every way but the TB is not so.
I know that you have puffed the TB system for quite a while but the fuel mileage #'s that you come up with are not very impressive. As I said before ...I got nearly your claimed mpg on my Travco Espirit ... absolute ZERO tweaking and with a brake calipher hanging up.
But you butter your bread as you see fit. I will stick to my secret Edelbrock intake and the famous TQ carb.
Propane trick:
Simply pour hot water ( I used a large coffee mug in the microwave for 1 minute)down the side of your tank. Where there is liquid propane it will absorb the heat and be cool to the touch. The empty space (vapor) will not absorb the heat and the tank will be warm.
I tried it the other day and was surprised that the level was easy to determine. Easy to feel the difference. With a larger tank you may need more water, but this worked great on the Cruiser.
My solution? .... in my 73 Class A ... I found a complete 3.73 geared axle assembly and will be putting that in to replace that 4.56. Anyone care to guess how many fewer rpms the engine will turn with that shorter gear in it(vs that 4.56) .... during a 6000 mile trip?
I found a calculator online to check gear ratios. I guessed at a 33 inch tire diameter for your rig and assumed no overdrive trans.
4.56 ratio......2787rpms @ 60mph
3.73 ratio......2280 rpms @ 60mph.
So for the sake of simplicity I figured a steady 60 mph. for the 6000 miles. I come up with 16,722,000 revolutions per 6000 miles for the 4.56 ratio and 13,680,000 revolutions per 6000 miles for the 3.73. A difference of 3,042,000 revolutions or enough to go 22.2 hours at 60 mph, or 1332 miles, at 8 miles a gallon (I'm guessing) that's like getting 166.5 gallons of gas for free!
I need a nap...