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Wisconsin compression release/ spark plug


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  #1  
Old 08-20-2019, 11:07:52 PM
CharlieB CharlieB is offline
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Default Wisconsin compression release/ spark plug

I'd like to find a spark plug/compression release that replaces the standard spark plug in an old Wisconsin single-cylinder engine. The only ones I can find are made for motorcycles and cost more than my engine is worth. Is there a budget friendly source for these things?
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Old 08-20-2019, 11:23:34 PM
gdstew gdstew is offline
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Default Re: Wisconsin compression release/ spark plug

I am not familiar with what you are asking for but, you could possibly use one from an old chain saw. Just drill and tap a hole in the head somewhere by the plug.
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  #3  
Old 08-21-2019, 04:48:36 PM
I like oldstuff I like oldstuff is offline
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Default Re: Wisconsin compression release/ spark plug

Hate to say it but if it's too hard to pull for you have a young kid do it.
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Old 08-21-2019, 10:35:06 PM
CharlieB CharlieB is offline
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Default Re: Wisconsin compression release/ spark plug

Well, Oldstuff, back when Eisenhower was president, I had no problem hand cranking engines. Now that most of the sand is in the bottom of the hourglass, things are different. I guess I could have my grandson crank the engine for me, but he uses all his time with me trying to keep me computer literate.
The engine has an electric starter that worked well until the compression release failed. Now it can't make it over the compression hump. The correct solution is to open up the engine and repair the compression release, but I'm trying to avoid that.
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Old 08-21-2019, 11:27:46 PM
K-Tron K-Tron is offline
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Default Re: Wisconsin compression release/ spark plug

Charlie, which model Wisconsin engine do you have? Very few have a factory compression release built into the camshaft. The solution might be a stronger starter motor. For example, early AGNDs used the 4" body Prestolite MBG, and later AGNDs with a compression release used the 3" body Prestolite starter that the AENL used. The MBG starter has some serious power, the "same" model minus the bendix was used on the twins and the V4s.

Chris
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Old 08-23-2019, 08:38:15 AM
CharlieB CharlieB is offline
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Default Re: Wisconsin compression release/ spark plug

Thanks, Chris.
The engine is an S12D.
The starter is an aftermarket belt driven Delco Remy starter/generator.
It's a 12V system, and includes a large automotive battery, so plenty of amps.
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Old 08-23-2019, 11:12:54 AM
Tracy T Tracy T is offline
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Default Re: Wisconsin compression release/ spark plug

can you try a bigger pulley on the engine or a smaller pulley on the delco? the delco setup worked, but not really well! they used it on kohlers too, with some of the kohlers you could use a newer flywheel that had the more modern geared drive from the starter to the flywheel I dont know if you could go that route with your engine or not. maybe use a idler pulley so you can let the delco spin up then engage like alot of the old radial aircraft engines did? if you listen to one of those beast start the starter is slowley clutched into the load.
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Old 08-23-2019, 08:50:38 PM
CharlieB CharlieB is offline
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Default Re: Wisconsin compression release/ spark plug

Thanks, Tracy.
All good ideas to consider if I can't find a suitable external compression release valve.
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Old 08-23-2019, 09:05:29 PM
Tracy T Tracy T is offline
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Default Re: Wisconsin compression release/ spark plug

could you make one out of one of those nonfouler deals that is supposed to keep the plug from fouling in a worn engine that burns oil? almost 90% of the machine work is done, they are cheap, and it wouldnt require modification to any of the engine.
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Old 08-23-2019, 09:42:57 PM
K-Tron K-Tron is offline
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Default Re: Wisconsin compression release/ spark plug

I think you are going about this all wrong. I have an S-12D, and despite it being a 29 cubic inch engine, it is very easy to rope start or electric start with the delco starter generator. When was the last time you adjusted the valves on your S-12D? The clearances may be off enough that the compression release built into the cam is non-functional.

Chris
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Old 08-23-2019, 10:18:40 PM
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Default Re: Wisconsin compression release/ spark plug

How about something like this.
https://www.ebay.com/itm/COMPRESSION...wAAOSwwcRadBVv
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Old 08-24-2019, 02:43:02 AM
CharlieB CharlieB is offline
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Default Re: Wisconsin compression release/ spark plug

Thanks Chris.
I agree. Very easy to rope start, and the Delco starter works great. Wonderful engine and starter.
Good call on the valve adjustment.Thanks.
I did adjust the valves to spec recently, but I'll go back and double check.
While I'm at it, I'll rotate the engine by hand to feel for compression. If I still have full compression, I'll know that the exhaust valve lifter is riding on the cam lobe and not on the compression release.
If that's the case, for now, I can manually roll the engine up to the beginning of compression and back it off one revolution. That lets the starter spool up enough to crank the engine easily.

---------- Post added at 02:43:02 AM ---------- Previous post was at 02:08:43 AM ----------

Hey Tracy,
Good idea. Thanks.
I had to look up spark plug non-foulers. Never heard of them before.
I found hundreds of them on the Net, but every one had metric threads.
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Old 08-24-2019, 09:34:40 AM
Tracy T Tracy T is offline
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Default Re: Wisconsin compression release/ spark plug

I could be mistaken but i believe all spark plugs have metric threads even ford, GM way back into the 60's. you should be able to take the numbers off of your plug and get all of the specs including thread pitch etc.

---------- Post added at 09:34:40 AM ---------- Previous post was at 09:22:00 AM ----------

found this digging around, hope it helps.

Most spark plug are sae hex (5/8 or 3/4) but metric thereds(14 or 18).Apr 6, 2011
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Old 08-24-2019, 10:35:36 AM
CharlieB CharlieB is offline
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Default Re: Wisconsin compression release/ spark plug

Thanks Tracy.
I learned something new today.
Just assumed the spark plug was S.A.E thread, like everything else on the engine.
Champion D-16 spark plug.
18mm-1.5 threads.

Charlie
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Old 08-24-2019, 10:43:45 AM
Tracy T Tracy T is offline
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Default Re: Wisconsin compression release/ spark plug

take a look at compression gauges, they have a schrader type valve to reset the gauge to 0 ofter the test. if you can find that valve and incorporate it into the fouler you are all set!
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