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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Ronaldson and Tippett Type N Magneto Coupling and Timing


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  #21  
Old 01-14-2019, 10:56:26 PM
cobbadog cobbadog is offline
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Default Re: Ronaldson and Tippett Type N Magneto Coupling and Timing

I'm interested in the marks on the maggie if you could post them please.
On my farm pumper I align to the exhaust push rod instead of a mark on the engine.
I bet once it comes to life it will be big and bold as to what and where these marks are.
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  #22  
Old 01-15-2019, 12:12:11 AM
Pollardd Pollardd is offline
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Default Re: Ronaldson and Tippett Type N Magneto Coupling and Timing

Hi Eddie,
I did think of the fencing wire idea and was thinking errrr might be a bit wobbly. But your right skilled blokes like ourselves should be able to allow for that
I probably won't get to try it until the weekend. I'll let you know what the results are. My shim stock arrived in the post so I should be able to finish mounting the magneto as well if it isn't too humid.
BTW
I did a compression test the other day and got around 50 psi.
Do you have any idea what might be considered a reasonable value?

This may also be a topic for another thread.

Thanks
David
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  #23  
Old 01-15-2019, 09:52:46 PM
Pollardd Pollardd is offline
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Default Re: Ronaldson and Tippett Type N Magneto Coupling and Timing

Quote:
Originally Posted by cobbadog View Post
I'm interested in the marks on the maggie if you could post them please.
Hi Cobadog,
Here are the pics of the magneto.
I be surprised if the timing marks show up now, but I like surprises
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  #24  
Old 01-16-2019, 12:43:09 AM
cobbadog cobbadog is offline
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Default Re: Ronaldson and Tippett Type N Magneto Coupling and Timing

Those look like impulse timing marks. You wont use them for a direct drive.
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  #25  
Old 01-16-2019, 01:30:00 AM
eddie bedwell eddie bedwell is offline
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Default Re: Ronaldson and Tippett Type N Magneto Coupling and Timing

HI David,
I believe cobbadog is correct. Link is to a site--Bright Spark Magneto's-- with Lucas Magneto manuals on line for viewing. The graduations are shown in the Section on Impulse Couplings.

http://brightsparkmagnetos.com/libra...SR2,%20SR4.pdf

Hope this helps.
Cheers,
Eddie B.
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Old 01-16-2019, 06:16:24 PM
Pollardd Pollardd is offline
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Default Re: Ronaldson and Tippett Type N Magneto Coupling and Timing

That makes sense. I couldn't see how they would be of any use as they are completely covered when the Magneto is mounted.

I'll post again once I have made any progress.

I'll also create a new thread about my compression readings. Maybe that will attract the attention of someone who knows the details.

David

---------- Post added at 09:16:24 AM ---------- Previous post was at 09:13:27 AM ----------

Great Manual as well!
Thanks
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Old 01-16-2019, 11:16:22 PM
cobbadog cobbadog is offline
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Default Re: Ronaldson and Tippett Type N Magneto Coupling and Timing

You will also need to time the magneto itself before timing it to your engine with the drive coupling.
When rotating the magneto in its correct direction as shown by the big arrow the magnetic flux (greatest resistance) should happen when your points are breaking. On the SR1 I know that I had to adjust the cam that opens the points so that the magneto worked at it's best. Then I timed the driven gear for the farm pumper engine.
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Old 01-17-2019, 12:47:17 AM
Pollardd Pollardd is offline
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Default Re: Ronaldson and Tippett Type N Magneto Coupling and Timing

Hi Cobbadog,
That is great information. I can feel the magnets resistance when I turn the magneto by hand. I assume that is what you are referring to. They old guy that reconditioned this magneto seemed to know what he was doing, so this step may already be done. He did ask me about the direction of rotation I needed and it was already correct. I haven't had the cover off the points yet. I figure I won't dick around with stuff until I need to. No point in me breaking it early
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  #29  
Old 01-17-2019, 05:27:03 AM
eddie bedwell eddie bedwell is offline
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Default Re: Ronaldson and Tippett Type N Magneto Coupling and Timing

Hi David,
50 lbs compression pressure should get you going.

Depending on several factors the compression you read can vary :-
engine hot or cold, rings oiled or dry.
Testing should be done with the throttle wide open as it will make a difference if it is closed--less pressure--the governor should hold the throttle open anyway, but, the choke must be open also.

Valves leaking--turn engine against compression and listen the inlet, exhaust ports for leaking valves and in the crankcase for leaking rings, worn scored bore etc.

If the engine has not run for some time the compression can seem down until oil seals the components again.

I have made engines myself that actually fire at about 1/3 the way down the intake stroke when there is negative pressure in the combustion chamber--they run well on both LPGas and petrol/gasoline.

That being said, too low a compression in your engine can affect startability, but 50 psi should get you a start.
Side valve engines generally have lower compression than overhead valve engines.

All I can think of for now--hope this helps.
Cheers,
Eddie B.
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Old 01-17-2019, 07:30:00 AM
Pollardd Pollardd is offline
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Default Re: Ronaldson and Tippett Type N Magneto Coupling and Timing

Who knows how long since this engine has run. Many, Many years would be an estimate. I think it has had a few homes in a non running state where the owners have been big on hopes and small on action. (Based on theory and conjecture )
The previous owner gave me an estimate of 50 years but I don't know what he based this on. I suppose it is plausible as it is probably around 90 years old now. It has no serial number plate.
I squirted some Oil down the spark plug hole and it didn't make a difference to the compression. You could be right about running it for a while and lettings things seat in again. I have no idea what the bore or rings are like. I'll give it a go at 50. At least I have a before shot and I will know if I get any improvement. I'm going to pull the carbie apart and clean it out as my next sub project. I'll try the compression test again when I have that off.
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