Is "true dual" in the header? - Road Glide Forums
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post #1 of 11 (permalink) Old 11-18-2012, 09:30 AM Thread Starter
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Is "true dual" in the header?

Probably my stupid question for the 2012 calendar year:
I see Fuel Moto and others make a "header" for true dual performance.
Does that mean I can keep my VH Monster Oval "mufflers"?
Educate me -- thnx, DOOF

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post #2 of 11 (permalink) Old 11-18-2012, 10:00 AM
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Correct, unless specified, these headers are designed to work with any standard aftermarket mufflers.

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post #3 of 11 (permalink) Old 11-18-2012, 11:56 AM
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Originally Posted by DOOFUS View Post
Probably my stupid question for the 2012 calendar year:
I see Fuel Moto and others make a "header" for true dual performance.
Does that mean I can keep my VH Monster Oval "mufflers"?
Educate me -- thnx, DOOF
Indeed, "true dual" is a term used for headers. Now, in case you wanted some casual reading (I'm bored)...

A real set of "true duals" has one individual pipe for each cylinder and those two pipes are totally isolated all the way to their own dedicated muffler. Some of us ol'pharts really like that old-time sound (or as close as we can come to it these days anyway).

Fuel-Moto (and other manufacturers including stock HD) use what's often called a 2/1/2 approach... two pipes at first but are cross-connected somewhere near the half-way point and then split back out into two different pipes for delivery to the mufflers.

This approach improves torque/performance but might not provide quite as much of a true dual sound as a set of real true duals does (pretty hard to tell the difference but if someone is really picky, well...)

Both of these "dual" types most often work with the stock or an aftermarket set of mufflers. IIRC, Some manufacturers used to mandate a specific set of mufflers (probably theirs) but not many do and they'll tell you if they do (want you to buy their mufflers).

Finally, there are the 2:1 type head-pipes and they are obviously not part of your question so no more casual reading

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post #4 of 11 (permalink) Old 11-18-2012, 02:24 PM Thread Starter
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Smarter Brothers -- thnx !!!!

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post #5 of 11 (permalink) Old 11-18-2012, 02:33 PM
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Originally Posted by 4getNo1 View Post
Indeed, "true dual" is a term used for headers. Now, in case you wanted some casual reading (I'm bored)...

A real set of "true duals" has one individual pipe for each cylinder and those two pipes are totally isolated all the way to their own dedicated muffler. Some of us ol'pharts really like that old-time sound (or as close as we can come to it these days anyway).

Fuel-Moto (and other manufacturers including stock HD) use what's often called a 2/1/2 approach... two pipes at first but are cross-connected somewhere near the half-way point and then split back out into two different pipes for delivery to the mufflers.

This approach improves torque/performance but might not provide quite as much of a true dual sound as a set of real true duals does (pretty hard to tell the difference but if someone is really picky, well...)

Both of these "dual" types most often work with the stock or an aftermarket set of mufflers. IIRC, Some manufacturers used to mandate a specific set of mufflers (probably theirs) but not many do and they'll tell you if they do (want you to buy their mufflers).

Finally, there are the 2:1 type head-pipes and they are obviously not part of your question so no more casual reading
That summed it up very well. I would add that true duals will sometimes cause a dip in the torque curve between 2,000 to 3,000 rpm range that can be hard to eliminate when tuning. This may not occur, depending on your engine combo.


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post #6 of 11 (permalink) Old 11-18-2012, 03:00 PM
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That summed it up very well. I would add that true duals will sometimes cause a dip in the torque curve between 2,000 to 3,000 rpm range that can be hard to eliminate when tuning. This may not occur, depending on your engine combo.
Thanks mocotom and concur with you too on the slight dip with real true duals. The 2/1/2s might not sound quite as cool as real true duals but they're more efficient... one more choice each owner can make and why each of us eventually has an HD that became so damn expensive (she's mine dammit, my Harley, my way).

BTW - I really like those new rotors you got. Very nice.

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post #7 of 11 (permalink) Old 11-18-2012, 03:05 PM
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Smarter Brothers -- thnx !!!!
Glad to help if we can - anytime.

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post #8 of 11 (permalink) Old 11-18-2012, 03:35 PM Thread Starter
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post #9 of 11 (permalink) Old 11-18-2012, 04:08 PM
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Quote:
Originally Posted by mocotom View Post
I would add that true duals will sometimes cause a dip in the torque curve between 2,000 to 3,000 rpm range that can be hard to eliminate when tuning. This may not occur, depending on your engine combo.

Heh, I had a V&H 2-1 ProPipe that caused a massive dead spot in the power band on my Wide Glide, went back to the factory staggered duals with slip-ons and it went away.

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post #10 of 11 (permalink) Old 11-18-2012, 06:16 PM
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Well, ya gotta trust a fellow squid !!!!!!
You bet... saw yours too. I'm an old tin-can sailor that did a little bit of time fishing on some strange rivers.

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