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Country Discussion Topics
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Hit or miss engine question
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Tom A    Posted 09-27-2003 at 16:36:32       [Reply]  [No Email]
What does it mean when a hit or miss engine that is not under load hits almost all the time? Might go 6 or 8 pops in a row before it skips one.

I was looking at one at a tractor show today that is for sale, and that's what it was doing. Most of the ones I've watched before seem to go for quite some time between pops when they're not under load. Is this one perhaps in need of a rebuild, or is there some simpler explanation. It is an old Massey engine.

thanks,
Tom


deadcarp    Posted 09-27-2003 at 18:29:20       [Reply]  [No Email]
The flywheel probably needs adjustment (which is done away from the flywheel) - somewhere upstream of the spark plug there should be a coupla spinning weights that spin level (rather like a wooden clock's bullhorn pendulum) - right above them should be threads on a vertical shaft to tighten or loosen them. (or a stick that slides up/down a notched shaft or something like that) that would adjust the size of circle that they spin around in. by freeing up the weights, you enlarge the circle and they won't fire as soon as before - gawd i love the sound of those things - we used a really hazardous one for splitting wood - nobody ever got hurt but you had to time the block to get nestled between swishes of the blade - way before osha - perish the thought. oh well, safer tham getting drunk and riding logs into the sawmill - old timers had their own brand of extreme thrills :)




Fawteen    Posted 09-27-2003 at 17:23:23       [Reply]  [No Email]
This is yet another situation where I'm not going to let my amazing ignorance of the subject keep me from having an opinion ":^)

One system of H&M ignition is to use a flyball to open the points. When the RPM falls to the appropriate level, the points open and the engine fires. I think I remember hearing of a couple of models that use the same idea to hold the exhaust valve open (no compression=no fire).

Based on those (possibly erroneous) assumptions, I'd say either the flyball is improperly adjusted, or the engine has a tight bearing somewhere causing enough drag to keep the RPM down near the "fire" range.

Then again, I could be completely full of it...


bob ny    Posted 09-27-2003 at 16:54:08       [Reply]  [No Email]
my conception is miss controls the engine speed by cutting off the ignition when it runs too fast
hit when the engine runs too slow it hits and speeds the engine thus run fast no pop slows down hit to speed engine hit miss miss miss miss hit and so forth


Clod    Posted 09-27-2003 at 17:30:41       [Reply]  [No Email]
I would propose that a valve is the cause of the sound that could be considered a hit when it actually is missing as the valve is allowing the pop in the intake.But it is easy to guess wrong from a discription.The first guy might have it just as it is.


bob ny    Posted 09-27-2003 at 17:37:39       [Reply]  [No Email]
i could have gone deeper where the govenor holds the valve at the same time the ignition was off but i thought a simple answer would surfice i quess i should have left it to the pros


Clod    Posted 09-27-2003 at 17:45:31       [Reply]  [No Email]
Hello NY.. Yes ,, I heard that..I was just passing through.It is late here,,Nice to see you pop in ..Good night pal..


Uncletom    Posted 09-27-2003 at 17:53:15       [Reply]  [No Email]
A hit and miss engine is actually a 8 stroke engine. My wifes grandpa use to rebuild them as a hobby. Most engines today are either 2 stroke ore 4 stroke. Back then some were 8 strokes and called hit and miss engines. Way before my time,but i remember him telling me that.
Uncletom


sameer dhakre    Posted 10-05-2004 at 01:07:56       [Reply]  [Send Email]
i am engg student. i want to give seminar on topic "8 stroke engine".but i can not find any information on this topic.
sir, please send me the information on "8 stroke engine".as erely as possible on my e_mail.with respect to the following points
(1)working with fig.
(2)recent research on it
(3)why it is not come in market yet
thanking u.


sameer dhakre    Posted 10-09-2004 at 02:45:15       [Reply]  [Send Email]
i am engg student. i want to give seminar on topic "8 stroke engine".but i can not find any information on this topic.
sir, please send me the information on "8 stroke engine".as erely as possible on my e_mail.with respect to the following points
(1)working with fig.
(2)recent research on it
(3)why it is not come in market yet
thanking u.



Clod    Posted 09-28-2003 at 11:31:51       [Reply]  [No Email]
OH!! Yes! Now I see what you are talking of..They had some on oilwell pumps when I was younger..You could hear them for miles ..They are strange things..I found a site that had some of those but cant remember the address..If I find it I will put it on board.What are you doing with that engine?Just something to play with I guess.


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