My 10 dollar exaust system, a question.

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My 10 dollar exaust system, a question.

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Harley Davidson Forums >> Harley Davidson Motorcycles >> Evo Classic Models >> My 10 dollar exaust system, a question.

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My 10 dollar exaust system, a question. - 5/10/2008 5:17:28 AM

Kilgore Trout

Posts: 2
Joined: 1/26/2008
Status: offline

My first post.
I have a 86 evo with 4 speed kickstart. I got the bike in 87 and its been a great bike for 20 years.
Last year at the Davenport swapmeet I ran into a stock set of pipes with stock slipons.. I paid 10 dollars for the whole works .
This year at the Woodstock swapmeet I found a Supertrapp 2 into one with a Supertrap muffler disk setup.  I got a fair deal on this but the collector wont fit because its for a 5 speed. Well thats too bad.

The stock set bolted up nice .So I drilled a 3/4 hole thru baffel for more flow. This is a bit less loud than my other pipes. Also I was hopeing for more back pressure. It runs better.It has a EV13 cam and Jetted CV.

Ok my question,,,, ready?   What does the crossover pipe for on the stock pipes do?
Will the motor run better leaving it on? Or off?

Kilgore T.

Here is a link to photo of old pipes   http://i150.photobucket.com/albums/s91/Woodrow_07/86Harley003.jpg

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RE: My 10 dollar exaust system, a question. - 5/10/2008 7:56:17 AM

Fat Henry

Posts: 1413
Joined: 9/1/2005
From: Durant Iowa
Status: offline

I understand it evens out the back pressuree and helps to scavange the exhaust. With out it it will change the torque curve. I can't verify it because I still use the crossover. Iwould have to try both on the same bike with the same set-up to know for sure. It was explained to me that it helps mostly in the low end. I know its not much help but I tried. BTW I live by Davenport maybe see you there.

Oh Yeah...... Welcome to the forum

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Do the thing right.
Do the right thing.

(in reply to Kilgore Trout)

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RE: My 10 dollar exaust system, a question. - 5/10/2008 6:46:10 PM

89 FXRS

Posts: 161
Joined: 12/8/2007
Status: offline

quote:

ORIGINAL: Fat Henry

I understand it evens out the back pressuree and helps to scavange the exhaust. With out it it will change the torque curve. I can't verify it because I still use the crossover. Iwould have to try both on the same bike with the same set-up to know for sure. It was explained to me that it helps mostly in the low end. I know its not much help but I tried. BTW I live by Davenport maybe see you there.

Oh Yeah...... Welcome to the forum

Ditto, on the explanation that is what I understand also. To be honest I do not like the looks of the crossover pipes but I am to cheap to replace good pipes.

(in reply to Fat Henry)

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RE: My 10 dollar exaust system, a question. - 5/12/2008 9:24:38 AM

fxstcguy98

Posts: 1179
Joined: 1/16/2006
From: Columbus, OH
Status: offline

I don't like the look of the crossover either (makes is look like a sportster). But my bike runs so strong right now, I'm affraid to mess with it.

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EITHER GET A CLUE OR GET OUT OF THE F@#KING PASSING LANE!

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RE: My 10 dollar exaust system, a question. - 5/12/2008 10:20:15 AM

Kilgore Trout

Posts: 2
Joined: 1/26/2008
Status: offline

It could be my imagination but it does seem to Idle a bit better ,Its a lot quiter,and seems strong off idle.
Ive got a lot of miles on this bike in the last 20 years , Im on the 3rd speedo.

What I plan is to find a junked collector cut it up and make a 2into 1 using the stock pipes and the 2 inch slipon Supertrapp. Then paint the whole works black. Photo of old setup is in first post(link). I dont think the paughtos? had enuf back pressure for me.

By the way Im a cheap bastard also, who else would never sell any of there bilkes?

Kilgore Trout

Keep a eye out for the Cargo barge this year at Davenport.

(in reply to fxstcguy98)

Post #: 5

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