5.3 on propane help

blaisetd · Sep 13, 2015

I have a 5.3 with a Z06 cam, MSD box, carb intake and Gotpropane set up going in an IBEX chassis.
If anyone is running the same motor set up, what timing pill did you use or did you go custom?
I have started it on the stand a handful of times with the first pill. But have read that 17* at idle and 30*
for 2500 and up RPM is recommened. Thanks in advance. Blaise

Mr. leafspring · Sep 13, 2015

propane on LS why ???

blaisetd · Sep 13, 2015

I knew that question would come up. $50 for the motor out of a burned truck. Everything on the top was melted.

Mr. leafspring · Sep 13, 2015

gotcha do what u gotta do im on pane to but only cause i havent ran across a free 6>0 yet lol

Eddyj · Sep 14, 2015

I thought about going that route just because it seems like a good compromise between power and reliability. Plus it would piss people off, and that's always cool

Gotpropane · Sep 15, 2015

Timing sounds about right.I would run it and bring the different pills to see how it reacts. No reason not to retrofit an older engine to an LS and run teh propane. They run excellent.........with our kit

rajincajingt · Sep 17, 2015

Gotpropane said:
Timing sounds about right.I would run it and bring the different pills to see how it reacts. No reason not to retrofit an older engine to an LS and run teh propane. They run excellent.........with our kit

im running the same set up minus the cam and i found the best performance with the 3 pill. the gotpropane kit went on without a hitch and started up on the first try!! your timing numbers are right, you just cannot get there with the pills

that being said, all of the VERY little information there is on line suggests a custom tune. the timing needs to come in earlier than any of the stock pills will allow. in driving it around, you can feel when the right timing hits. i have NOONE around here that will even touch my CJ for tuning, so im stuck doing it with the provided MSD software. you have everything you need to do it yourself,, but i have not had the time or inclination to open up that can of worms. the 5.3 runs so much better than my old 350, i havent really wanted to mess with it.

ive been running this set up for well over a year, so if you have any questions, dont hesitate to ask.

onepieceatatime · Sep 17, 2015

Re:

Not my thread but I gotta ask. What is a "pill"?

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rajincajingt · Sep 17, 2015

Re:

onepieceatatime said:
Not my thread but I gotta ask. What is a "pill"?

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the MSD box comes with 5 or 6 pills that plug in the side for timing adjustments. they are preset curves to adjust the timing for differnt fuels, carb setups, altitude, whatever you need. they are pre-mapped from the factory for easy adjustment.

in the picture below, there is a red MSD box on the intake, the little white plug sticking out of the front is the "pill".

it also comes with a software and cable for you to make your own timing maps as well.

rajincajingt · Sep 17, 2015

the off idle torque on this setup is awesome. no hill killing, but this is the v notch at the top of ingrid's revenge in hot springs.

https://youtu.be/VECT8quTHek

i have been very impressed with this set up and the simplicity of the whole thing is very reassuring. hauling and filling propane tanks is still a pain in the ass.

altfuel1991 · Sep 17, 2015

I have attached an Excel spread sheet document that shows the different curves of all the chips. Any of the first three should work best as the others advance the timing too quickly.

rajincajingt · Sep 17, 2015

altfuel1991 said:
I have attached an Excel spread sheet document that shows the different curves of all the chips. Any of the first three should work best as the others advance the timing too quickly.

awesome man,

thanks for posting that. its in the manual somewhere.

rajincajingt · Sep 17, 2015

altfuel1991 said:
I have attached an Excel spread sheet document that shows the different curves of all the chips. Any of the first three should work best as the others advance the timing too quickly.

dude, i know youre the expert and all, but i would think that the black (1), teal (4) and yellow (3) curves would be best, given my limited experience. the yellow (3) looks like the best one for our application.

again, just an observation. please correct me if needed.

muddinmetal · Sep 17, 2015

rajincajingt said:
dude, i know youre the expert and all, but i would think that the black (1), teal (4) and yellow (3) curves would be best, given my limited experience. the yellow (3) looks like the best one for our application.

again, just an observation. please correct me if needed.

Do you tell Michael Jordan how to shoot a jump shot? Eddie Van Halen how to pick a guitar? Kush how to be gay? FU*K NO!

Barry is the best in the business & if he tells you something, say thank you and move on :****:

rajincajingt · Sep 17, 2015

muddinmetal said:
Do you tell Michael Jordan how to shoot a jump shot? Eddie Van Halen how to pick a guitar? Kush how to be gay? FU*K NO!

Barry is the best in the business & if he tells you something, say thank you and move on :****:

Really?

god forbid i try to understand something

altfuel1991 · Sep 17, 2015

No harm asking questions and thinking through situations. The ones past #3 are a little too aggressive for propane. They are more suited for gasoline. Gasoline burns slower than propane, that is why you need more total timing for gasoline. If you are running a high compression, high horsepower engine on propane then any excessive timing becomes critical as higher compression and bigger cams allow more fuel and air to enter and be compressed which causes higher cylinder temperatures. Propane is ready to burn as soon as it enters the engine unlike gasoline that has to be compressed and turned into vapor before it will be ready to ignite. Generally if you ever hear the valves rattle in a propane engine the timing is really too high and you are about to or already have damaged something.

onepieceatatime · Sep 17, 2015

Re:

I'm really interested in this thread and idea. I have a 350 on pane now but whenever it needs replaced I'd like more power of course and this might be something cool and different. Please continue to post your results and how you like it.

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rajincajingt · Sep 17, 2015

altfuel1991 said:
No harm asking questions and thinking through situations. The ones past #3 are a little too aggressive for propane. They are more suited for gasoline. Gasoline burns slower than propane, that is why you need more total timing for gasoline. If you are running a high compression, high horsepower engine on propane then any excessive timing becomes critical as higher compression and bigger cams allow more fuel and air to enter and be compressed which causes higher cylinder temperatures. Propane is ready to burn as soon as it enters the engine unlike gasoline that has to be compressed and turned into vapor before it will be ready to ignite. Generally if you ever hear the valves rattle in a propane engine the timing is really too high and you are about to or already have damaged something.

gotcha.

thanks for the information.

rajincajingt · Sep 17, 2015

Re:

onepieceatatime said:
I'm really interested in this thread and idea. I have a 350 on pane now but whenever it needs replaced I'd like more power of course and this might be something cool and different. Please continue to post your results and how you like it.

Sent from my SM-G900V using Tapatalk

i did that exact thing, its night and day, not a whole lot of extra power, but throttle response is incredible.