MSD used to have a propane/dual fuel ign box. I don't know if it is still available. Check their website.

Propane sucks on a cold engine in a cold climate. The propane comes from the tank as a liquid, and must be heated in the "vaporizer" before being transfered to the "mixer". The vaporizer is heated by engine coolant. If the coolant and therefor the vaporizer are not warm enough, the propane will not turn into a gas and the engine will die, when you open the throttle.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

propane conversions are a everyday thing on every car down here due to gas prices. Performance on propane engines sucks, even the mills preapred to run on propane. The only pros I see with propane is lower (almost non existent) emissions and the reduced amount of money needed to run the car. Or are we talking mixed fuels here (gas-propane?)

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

In my area, there is no reduction in the cost of fuel. Propane is just about the same price per gallon as 87 unleaded. Then when you figure the lower MPG of propane, there is no savings.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

that's mainly my point, plus the engine suffers a lot when used with propane (higher temp operating range, "dry" combustion, etc)

down here is a lot cheaper: premium 98 octane gas (93 octane in american octane rating) is $2 per liter, propane is $.90 per square meter (about the same amount of fuel, when converted). Used to be even cheaper.

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

I'm sorry, you're right. I went back and looked at some old notes and it was 9.25:1. Please forgive me. Sometimes I don't get enough sleep.

Mike

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Recognized by US Federal Courts as a Fuel Economy Expert!

Forget about it we all make mistakes.

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It is no co-incidence that propane is the same cost as gasoline...

5 years ago it was half the price...
It is also no small co-incidence that the proce of diesel is more than gasoline....

the government and detroit know how to get the max tax dollar out of us... They want to keep us driving gasoline vehicles...and inflating the cost of propane and diesel prevents a lot of people from exploring other fuels...Which prevents consumers from buying new cars that burn other fuels....Keeps the cycle going...

Think about it...If we consumed less fuel overall...There would be less revenue collected from fuel taxes.... For this reason the government would always push for the use of dirty expensive and inefficient gasoline over everything else.

here our LPG prices are at .56 a litre where as our cheapest petrol is at the moment $1.15 a litre. Most ppl get sucked into the whole *LPG gives you better mileage* routine. No it doesn't. Your pumping in twice as much LPG to get the same amount of mileage but it's the cheap cost that leads ppl to believe it's better. I have my LPG licence and work on these vehicles quite regularly(yes even in a Ford dealership, Ford out here produce just straight gas vehicles). Yeah it's ok if you know what your doing with gas but if you don't it can get nasty. And yes i too advise all family and friends to avoid putting LPg kitson their cars.
It really hates cylinder heads/valves.

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ditto.

BTW I see you also call gas to the propane and fuel to what guys here call gas... what a mess!

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

indeed....aswell as what they call *vaporizers* we call them convertors
here. Propane is LPG here. Might i add another bad point about LPG. It's a really dirty fuel. I mean when you look at it the convertor really is just a carby. These things fill up with such contamination from the fuel it creats a lot of problems inside the convertor. Well maybe it might just be the LPG we have here?

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Oh, I'm getting dizzy... we call your convertors "mixers"... and the LPG we call GNC (compressed natural gas)... now that we cleared all the terms, I agree is a shít! our LPG is very clean, the convertors ain't getting clogged with it... Is just that when you realize that you've spend a lot of money for the "mixer" and the convertor and lost half a trunk good of tanks, you're not saving any money if you are aiming for performance, your motor most likely would last less than 1/2 of its real life if you were using fuel, and top that with riding on a bomb-on-wheels.... not funny!

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Juan Ignacio Caino

Please use e-mail button istead of PM'ing. I do log in sometimes but I'll be answering quicker thru e-mail.

CNG and LPG are two very different critters. LPG is "Liquified Petroleum Gas" and can be on of a couple of different animals, most commonly propane. But, butane is also an "LPG." Propane and butane are heavier than nutural gas and are more easily converted to a liquid. In addition to CNG there also exist LNG or "liquified Natural Gas" as well as blends of natural gas and hydrogen.

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David Kight
'62 Valiant Signet, White
'98 Dodge Dakota
'06 Jeep Liberty

Growing older is unavoidable but growing up is strictly optional.

hi, .100 off my 69 head last month gave me 40 cc chambers. had 59 ccs before milling. also had some block milling to get pistons .070 in the hole and with with .040 gasket i figure on 10 to 10.5-1 comp . ron

Frank--

Thanks for a most excellent post. So I take it you've done a conversion yourself? How'd it work out for you?


Joe

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Joe Hoppe

71 D100 225 Super Six 727 AT on 2008 Crown Vic CopCar frame

64 Valiant Wagon 225 904 AT 3:23 8.75"