Propane injection

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Mar 10, 2010 | 02:57 AM

hairyboxnoogle

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Propane injection

I noticed this from another article, but after reading thru, the outcome seems a little too good to be true. (propane injection) First of all, wouldnt fuel going in thru the air intake cause the engine to detonate? Next, i understand the system wouldnt need a whole lot of pressure, but what about regulating volume. Also, what would this do for egt's. As i understand, DaveS did this at one time and didnt care for the results, (hoping you will chime in on this). If i could pick up that kind of power from something so simple and easy im all for it, but it just sounds too good to be true, leastways without there being some sort of negative side affect. This would be handy to have some sort of regulator on the throttle, say 1lb or so that kicks in at cruising throttle, or just above high idle, and increases propane as you increase the loud pedal. I understand you can use a hobbs switch with boost to accomplish this, though im turboless atm. On another note, im thinking this would work better with oxygen than propane.... propane is more fuel... NA motors lack air.... oxygen seems to be the better candidate. If nothing else i think this may turn out to be educational so lemme know what you guys think.

Mar 10, 2010 | 08:55 AM

starmilt

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From: Faibanks Ak.

It is human nature to like it and claim it is the best thing since sliced bread if you own or spend money on it. So I feel a lot of things are great and have great results just because someone has it. There has been people spend money on it and loved it , but then took it off (how come). I think if it was proven as good as the claims we would all be running it.
There has been several large trucking companies tried it and kept meticalus records on the benifits, if they could clear 1 mile to the gallon it would mean a million a year or more in their pockets, and none used it long. I have no experiance with it.

Mar 10, 2010 | 09:09 AM

Sycostang67

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From: Kuna ID

I have no experience with, but did see some dyno numbers with it. 205hp at the wheels, cant remember the torque but am pretty sure it was over 400.

Mar 10, 2010 | 10:11 AM

hairyboxnoogle

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Quote:

Originally Posted by Sycostang67

I have no experience with, but did see some dyno numbers with it. 205hp at the wheels, cant remember the torque but am pretty sure it was over 400.

And is that on a stock NA 7.3? More fuel mileage would be nice, but i would mainly be looking for a little extra juice with this, 20 horse sounds like a reasonable amount, but the question is, is it from the propane, or from the pump being turned up a flat or so. If the fuel mileage benefits arent there it may still be adventagous as a power adder, could run it together with water/meth and only use em when you want it on "power mode". the only thing i would like to do is have it on some sort of variable switch, something that would act kinda like a carburator, so you wouldnt over do it at lower rpms and between gears.

Mar 10, 2010 | 01:23 PM

Sycostang67

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From: Kuna ID

It was turbo'd. It was Darrin Toshs truck , "Big Ed" before he did a cummins swap. I'll have to see if I can find that post again.

Mar 10, 2010 | 01:47 PM

Sycostang67

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From: Kuna ID

I found it, I was wrong on the torque though. Supposedly this was an old motor pushing 15psi with propane.

Correct, Here are the dyno rsults:

First pull, no LPG
HP 183.15 Torque 325.45

2nd and 3rd pull with LPG

HP 205.35 Torque 362.64
HP 205.51 Torque 361.55

So 22.96 increase in HP
and 37.19 increase in Torque.

I guess 4 days later he lost a head gasket and swapped in the 5.9.

Mar 10, 2010 | 03:09 PM

starmilt

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From: Faibanks Ak.

LOL sounds like that 22.96 horsepower was expensive.lol

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Mar 10, 2010 | 08:33 PM

Dave Sponaugle

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From: Nutter Fort, WV

There are several ways you can do what you want on a turbo engine.
Boost is related to throttle and RPM.

On a NA motor, throttle position is only part of the equation, you can go wide open at 800 RPM's.

Next consider about 500 to build a safe system or around 1000 to buy one.

You are close to what a used turbo will cost.

Oxygen, talk about some high EGT's.

My take on the post above was he was running propane on a turbo motor running 15 pounds of boost.

Mar 11, 2010 | 02:53 AM

#10

Sycostang67

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From: Kuna ID

He said the truck had been losing coolant for over a year so he wasn't surprised when it blew.

Mar 13, 2010 | 01:24 PM

#11

hairyboxnoogle

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youre right dave, a type of propane "carburator" would be in order lol. Oh well i found out enough to satisfy me to the point that id say it isnt really worth it. Thanks for all the good info guys!