Timming For Propane
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Joined: Aug 2003
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From: Edmonton
Timming For Propane
I have received MANY timming setting recomendations for my 1987 5.8lt(351) ford 3spd auto. I currently have it set at 25 degrees and I still have LOTS of power on the highway. I have been told to set as high as 45 degrees and as little as 15 degrees and yes ... both recomendations were from certified mechanics.
What do you think, I prefer to hear from people who have experience with propane.
What do you think, I prefer to hear from people who have experience with propane.
Thread Starter
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New User
Joined: Aug 2003
Posts: 3
Likes: 0
From: Edmonton
Timming For Propane
Sorry I do not know ...
I am running a 425 impco mixer,
the truck is solely on propane ... it is a propane rebuilt motor... not sure if it was rebuilt with hardened valves only or if it has higher compression pistons as well. all I know is that when I purchased the long block, I had a choice of a standard or a propane version. I took the propane version. as for setting the 425, all I did was turn the idle low speed mixture in until I heard it run rought and the turned it out 1/2 turn, the high speed mixture is set at 3/4" which is what was recomended as a start setting. I was told that I did not have to turn that one out any unless I lacked power but was also told that the 425 was more than large enough for a 351 and would likely never have to turn it out ever. The engine runs great, with oodles of power at all rpms ... I just took a 2000 mile trip (3000km) and averaged 12 mpg driving at speeds of 60 to 70 mph through the mountains.
I am running a 425 impco mixer,
the truck is solely on propane ... it is a propane rebuilt motor... not sure if it was rebuilt with hardened valves only or if it has higher compression pistons as well. all I know is that when I purchased the long block, I had a choice of a standard or a propane version. I took the propane version. as for setting the 425, all I did was turn the idle low speed mixture in until I heard it run rought and the turned it out 1/2 turn, the high speed mixture is set at 3/4" which is what was recomended as a start setting. I was told that I did not have to turn that one out any unless I lacked power but was also told that the 425 was more than large enough for a 351 and would likely never have to turn it out ever. The engine runs great, with oodles of power at all rpms ... I just took a 2000 mile trip (3000km) and averaged 12 mpg driving at speeds of 60 to 70 mph through the mountains.
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Joined: Jan 1997
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Timming For Propane
Hmmmm.... I'm really not able to give you anything without knowing about the compression ratio, air/fuel ratio, etc. With those unknown, the best thing to do is advance it until you get detonation, then back it off a degree or two. Then try it again at wide open throttle.
