Gas Saver Question.

($1.16 a ltr) I was thinking of looking into these things. I'm not writing this to be flamed in any way but rather to get constructive inputs.

so is 0%

"SnoMan" snipped-for-privacy@snoman.com wrote in message news: snipped-for-privacy@4ax.com...

you realize the dodge 360/318 doesnt have a knock sensor and does not retard timing to eliminate/reduce detonation? They have

hmmm then its a conspiracy between dialmer crysler and shell oil (for example) to recomend in the owners manual that you use only recomended octane rating for your vehicle (most are 87) so that the oil company makes more money?? seems a bit of a stretch to me.

and you also realize that you stated this in another post.

" THe main reason that diesel get good MPG is because the fuel has a higher energy content (about 140,000 BTU/gal) and with the very high CR or 16 to 20 to 1 you get much higher thermodynamic efficency (convert more heat energy to work). "

and now

" To improve MPG a lot you need to reduce power needed to roll down the road, use a fuel with a higher energy content or run a much higher compression ratio (with proper fuel) that will increase overall engine efficeny and allow to extract more work for a gallon of fuel. "

now i realize that the other post im referanceing is clipped there so ill post it again completely. and note that in your fuel examples the diesel fuel had the highest btu per gallon.

here's what you posted in the "Exchange my V-10 for a diesel cost effective?" thread

I have read about several of them and I have a 79 Jeep J20 that I want to restore someday and I am seriously considering making it a propane only vehical. The problem with some conversions is that they put propane in a stock engine (and it will burn fine with extremely low emissions too) but propane has about 25% les energy per gallon than gas so you need more of it in a stock engine but since propane has a LOT higher octane, you can raise CR to 12 to 1 no sweat and increase power and efficency and get MPG simular to gas on stock compression but with a lot cheap fuel. It also burn a bit slower so more spark advance is needed to which most dual fuel (gas/propane) engine do not properly do. The draw back is you have to install a somewhat heavy tank for fuel stored under pressure but since propane weighs 4 lbs a gallon vs 6.5lbs/gal for gas, the lighter fuel ofsets most or all of this weight. Pound for pound, propane has more energy than gas. By weight, 6.5 lbs of gas (one gallon) contain about 120,000BTU (plus or minus depending on blend) and 6.5 lbs of propane has approx 145,000 BTU's (this heat energy is what drives the engine) while the same amout of E85 has only about 60.000 BTU (and a gallon of E85 weighs almost 8 lbs too). THe main reason that diesel get good MPG is because the fuel has a higher energy content (about 140,000 BTU/gal) and with the very high CR or 16 to 20 to 1 you get much higher thermodynamic efficency (convert more heat energy to work). But, if you use a fuel like propane (or even high octane fuel) it is possible to raise CR ratio a good bit and improve efficency. Some mention running cars on natural gas or hydrogen but the problem there is it take a lot of pressue and technology to store them in a ligud state to get a lot of range where propane is a LOT easier to store and handle.

----------------- The SnoMan

And, I believe going off a cliff with a 100 mph tail wind is required to get upto the 35% <vbg 2>

Ding...Ding...Ding...give that man a seegar...:-)

Add later Subarus. I see about 2 MPG better and a whole lot smoother running on 89 or topping up with 92 at about 2/3's tank. Must be something about that 10.0/1 CR ;}.

My old B II never seems to care about 87 or higher as lomg as it was decent gas.

Screw Ford, *I* would like to see 20 MPG out of my V10.. :)

you can just shut the engine off and coast *grin*