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

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  #141  
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1Scooter 1Scooter is offline
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Baffles in the drag pipes are exhaust restrictions. Foo Foo valve is a crankcase breather valve. Open or baffled exhaust has nothing to do with crankcase pressure.
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  #142  
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"Always heard engine needs a little back pressure? Is that the same with this set up?"

By set up, can I assume that you are meaning the Harley Davidson, 45* twin cylinder, single crankpin engine?

If so, then YES, back pressure is very important.

If I could be so bold as to tell my story, which starts with,
standard 1-3/4" drag pipes, to wrapped drag pipes, to 2" drag pipes, to 2" drag pipes wrapped, to 1-3/4" wrapped drag pipes with cored out slip on mufflers, to an OEM crossover pipe header for an 83 Ironhead and cored out slip on mufflers.

The engine absolutely loved the last setup for best flow, torgue and all round giddy up and I absolutely love the set up as well.
Try it, you and your engine may love this set up also.
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  #143  
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Thanks brucstoudt I wasn't even thinking of that. so focused on the pressure cooker lol. With that in mind Yup i'm just going to take them out. With what i've been seeing hate for it to blow some seal inside the engine. I'll report back the difference going down there now. Really curious if that baffle is the cause of the valve spitting. That it needs that free flow.... Maybe it will stop unseating the rear exhaust too. haha
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  #144  
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Thanks 1Scooter, I wasn't sure as every time I do something on the bike it sends the problem to another part lol. Tighten this rattles something else off lol. Was thinking there has to be a little bypass like the oil transfer in the case to the primary... Say the back pressure pushing on the rings, changing the case pressure cause ring bypass to smoke out the valve? idk

Fridge, yup that is the one. I got these drag pipes with the bike, maybe slip on be better route than the baffle later on.

Been keeping it going rather than full tare down
That first ride opened my eyes. Its like I adulted the bike with the baffles for the past 2 years, feel so sorry for the bike.

Thanks so much guys.

Will look in different direction as to why smoking out the valve after small ride.
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Quote:
Originally Posted by Fridge View Post
"Always heard engine needs a little back pressure? Is that the same with this set up?"

By set up, can I assume that you are meaning the Harley Davidson, 45* twin cylinder, single crankpin engine?

If so, then YES, back pressure is very important.

If I could be so bold as to tell my story, which starts with,
standard 1-3/4" drag pipes, to wrapped drag pipes, to 2" drag pipes, to 2" drag pipes wrapped, to 1-3/4" wrapped drag pipes with cored out slip on mufflers, to an OEM crossover pipe header for an 83 Ironhead and cored out slip on mufflers.

The engine absolutely loved the last setup for best flow, torgue and all round giddy up and I absolutely love the set up as well.
Try it, you and your engine may love this set up also.

That's the same setup I have on my '83. Along with an old SE air cleaner kit, Andrews accelerator pump, and a carb rejetting, it performs very well.


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If it ain't broke, don't fix it (especially if you don't know what you're doing). Most Sportster problems are owner-induced.
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