NEK5
3/4 ton status
Thats a BBC though, right?Don't ask and we won't tell
mine gets around 7 mpg, which is why my van is now fixed
CK5
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Propane powered DD *Spark Plug, and mounting questions*
- Thread starter NEK5
- Start date
Yeah its a 454, it also runs on unleaded so it suffers in fuel mileage. If I pulled the carb off and ran the plate only and tuned it just to run on propane, single plane intake, headers, ignition, could probably get in the low teens with it. I drive it so rarely that I probably should but its pretty low on the list of things to do
NEK5
3/4 ton status
ttt!
I am not saying your wrong but there are lots of power units using propane and turbos. Stock engines are perfect for this and propane has the extra octane. All you have to do is boost reference the vaporizer buy running a line from carb base to the vent on the vaporizer. I have a 80s impco paper on how to do and and many experts have done it with good results. I am going to try it. Of course I would guess down under things are much more advanced than the 70s tech most of us are still using here.
AussieK5
1/2 ton status
I'm confused, I said that propane and turbo's go together very well..... 'more than the sum of their parts' means each is good on their own, together they are fantastic. ie they are not 1+1=2, but 1+1=5, more than the sum of their parts.Quote:
Originally Posted by AussieK5
Propane and turbo's go together like beer and boobs, both good on their own, but together they're more than the sum of their parts.
I am not saying your wrong but there are lots of power units using propane and turbos. Stock engines are perfect for this and propane has the extra octane. All you have to do is boost reference the vaporizer buy running a line from carb base to the vent on the vaporizer. I have a 80s impco paper on how to do and and many experts have done it with good results. I am going to try it. Of course I would guess down under things are much more advanced than the 70s tech most of us are still using here.
BTW we mostly run the same gear you guys do, we have generally only have two options, Impco or Sprintgas, the super cool injected systems are about, but not yet readily available to retrofit to a non injected motor. The cost and hassle just aren't worth it.....much like fitting a OD tranny, it takes a metric butt load of miles in OD until you re-coup that extra grand spent putting it in.
Sorry I misunderstood. I think it makes for a great combination. My buddies at the chassis dyno think I am crazy (they like E85) but I think for a truck that tows it may be the next best thing to a diesel.
NEK5
3/4 ton status
Anyone happen to have a pic of their throttle cable/kickdown cable assembly with the propane setup?
AussieK5
1/2 ton status
You'll either have a carb there (dual fuel) or use a holley/quad base plate under the mixer (single). Cable setup-ups rarely need modifying on a conversion.
Jas
Jas
blazin_blazer
1/2 ton status
do you still have good low end power w/single plane intake? i've been told single plane for upper rpm's
AussieK5
1/2 ton status
Propane is a dry gaseous fuel, petrol (aka gas) is not, its wet, large single plane intakes do not work well with petrol at low rpm due to air/fuel slow velocity in the runners, the fuel is no longer atomised and drops out of suspension, your stoichiometric ratio (amongst other things) is then fkd up. Propane could care less if its moving at 900ft/s or 9ft/s its all ready been mixed with the incoming air charge and is homogenous in nature. The large single plane runners just let the propane engine breath better at all rpms, especially the sub 2500-2600 region in which most propane engines can shine. The combination of a single plane manifold and correct timing curve is what helps a dedicated propane engine match their 'gas' counterparts at lower rpm.
dfl701
1/2 ton status
So if you just run propane you eliminate the carb Ll together? Is that what your sayin?
dfl701
1/2 ton status
So that's why propane runs better. Or one reason I assume
dfl701
1/2 ton status
So what's recommended? Buying a new kit or piecing it together yourself?
In the hopes of not sounding like a complete moron, what is the thing in place of the A/C? Is there something in the system that needs to be belt driven? Please excuse my serious lack of research.
That is the evaporator/vaporizer and the shut off vacuum switch. Also mounted where my A/C used to be is my OBA stuff. There is nothing belt driven needed for the propane conversion, but belts are helpful if you want to turn your water pump, alt, a/c, OBA, weldernator, etc.
NEK5
3/4 ton status
What do you guys think I should up my timing to, just running on propane? It won't be a dual fuel setup.
dfl701
1/2 ton status
This thread sorta died it seems.
AussieK5
1/2 ton status
Timing: 10 deg at crank, Full adv by 2250 - 2500, If you tow max total adv should not exceed 30 deg.
NEK5
3/4 ton status
So 10* above TDC. Is that doable with the dizzy? I'd rather not have to pull the waterpump, etc to get back in there
AussieK5
1/2 ton status
What the?....just adjust your timing to show 10 deg before TDC ie initial advance, and have your dizzy re-curved to have 9 deg (1 deg on dizzy = 2 at crank) come on full by 2250-2500rpm. Full advance will then be approx 28 deg (10 initial + 9x2 at dizzy). You may have to play around with lighter springs to achieve this, you'll only have to pull your dizzy if you get a shop to play with the curve for you.
Jas
Jas
