Heymow - Lawnmower Racing Forum
Engine Help => Briggs Flathead => Topic started by: daddyracing on May 07, 2014, 09:58:50 pm
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I got a stock model 28 flathead. Is there anyway to advance the timing or anything? Maybe for a little more bottom end. Just trying to get some info if you guys can help
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The ignition timing you can with an offset timing key for the flywheel. I know EC sells them.
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The ignition timing you can with an offset timing key for the flywheel. I know EC sells them.
Up to 9 degrees.
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Ok I found them on ec. But how exactly does it work?
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Ok I found them on ec. But how exactly does it work?
As far as flywheel hubs go, the key is just an indexing tool. It's the taper of the outside of the crankshaft and the inside of the flywheel hub that actually grip each other (Which is why it's so important to lap the hub to the crank).
So think of it this way--cut a flywheel key in half, long-ways. now put it back together, but one half offset to the other, meaning you aren't quite lining up the pieces. The offset key works the same, but is more accurate.
Don't know if that makes sense, but there you have it.
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As far as flywheel hubs go, the key is just an indexing tool. It's the taper of the outside of the crankshaft and the inside of the flywheel hub that actually grip each other (Which is why it's so important to lap the hub to the crank).
So think of it this way--cut a flywheel key in half, long-ways. now put it back together, but one half offset to the other, meaning you aren't quite lining up the pieces. The offset key works the same, but is more accurate.
Don't know if that makes sense, but there you have it.
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yes this makes complete sense. Appreciate it guys
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Just use a degree wheel, and set your timing to whatever you desire
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If you lap the flywheel hub to the crankshaft taper, a key is not needed at all, if you use a degree wheel you can set timing wherever you like that way, but if its a stock engine, dont expect big gains ;)