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What Psi Will Support Combustion?


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22 replies to this topic

#16 Alc ONLINE  

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Posted May 30, 2012 - 06:00 AM

Has anyone used those " Mega Fire Ignition Moudles " in place of points & condenser ? Might be the way to go , Al

#17 DougT ONLINE  

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Posted May 30, 2012 - 07:25 AM

I've used them and they work good. Sure saves cleaning the points everytime you want to take something to a show. There are some engines they don't work good on. The Briggs with the magnamatic ignition is one that comes to mind.
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#18 RoosterLew OFFLINE  

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Posted May 30, 2012 - 07:47 AM

AS for an answer to "how much compression is needed"...the reason you are getting different answers is because it is different for every engine.
Your little 2 1/2 HP is not going to take near what say a 20 HP Briggs Opposed will take. More compression=more power.
To simply run, an engine must make enough power to turn itself over. To run well is another matter entirely.
I have had single cylinder Briggs "run" fine on 25 PSI, until you put a load on them....but if your above 60 on most any engine you should be running OK.
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#19 Toolpartzman OFFLINE  

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Posted May 31, 2012 - 06:45 AM

You may look closely at the plug after a few attemps-You mentioned frequent cleaning-Its possible plug fowling is at least partly to blame. Even with low compression, you should get at least a "pop" if both fire and fuel are present. I may not run long or die if any load is applied, but a "pop" tells you its trying.

#20 Alc ONLINE  

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Posted May 31, 2012 - 07:34 AM

I tried at least 3 different plugs and not even a " pop" but I guess it because the spark comes and goes , must be more "go" then come , lol , Al

#21 Michiganmobileman OFFLINE  

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Posted June 01, 2012 - 07:27 PM

I have an ignition module on my 7016 with BS 16HP. Been on since shortly after I got it and have had no troubles with it. I dont think that would help if the actual ignition(spark) coil is your problem though.
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#22 MH81 ONLINE  

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Posted June 01, 2012 - 10:31 PM

Al, this has been rattling around in my brain for a day or so... Is there much play in the crank bearings? Even a couple thous can change your gap on the mag or alter the timing on the points.

#23 Alc ONLINE  

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Posted June 02, 2012 - 06:04 AM

Alan I'll have to check the crank for play , never thought of that , thanks , Al




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