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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #11  
Old 4 Weeks Ago
Iron Mike Iron Mike is online now
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Sportster/Buell Model: xlch
Sportster/Buell Year: 1964
Sportster/Buell Model #2: XLCH IR EFI
Sportster/Buell Year #2: 1971
Other Motorcycle Model: BMW K1200RS
Other Motorcycle Year: 2001
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or RJ12YC for Res.
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  #12  
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Sportster/Buell Model: XLCH
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The 216 is nonresistor.
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Quote:
Originally Posted by cazz1000 View Post
ryder rick,,,, why does a extended tip plug need less advance,,,, and what would u recommend with the ult iggy,,,, thks cazz,,,
It's not that an extended tip plug needs less advance and more that a lawn mower plug needs more advance.

The difference is just a degree or 2, it's not reduced as much as a dual plug setup.

An Ironhead combustion chamber is a very poor design and that is why it needs more advance. Anything you can do to improve that will require less advance.
The extra advance is needed because the piston dome divides the cylinder and blocks flame travel.
The down side of that is that the increased advance puts you closer to detonation, it narrows your tuning window.
It increases the susceptibility for detonation because the cylinder pressure rises before all the fuel gets lit.
And remember the piston is still rising as that fuel is lighting.
Throw in high ambient temps and a tank of bad gas and BOOM! you fall outside your tuning window.
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