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header collector questions

  1. #1
    Senior Member H20MOFO's Avatar
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    Default header collector questions

    How much benefit is there to a merge collector vs a std. There 5 to 10 times the $ of a regular collector, are they "that" awesome. I assume all your primarys need to be the "correct" length to take advantage of them. If all your primarys were the same length would that be considered perfect?? As far a std collectors go would a 19 or 20" collector make a little more than say a 14" collector, or wouldn't there be enough of a difference to worry about. I was just curious if there was an "ideal" length for those. Oh btw when it comes to slip on collectors what the best way to keep them fuggers on.lol
    Another Hot Boat refugee

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    steelcomp was here
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    Quote Originally Posted by H20MOFO View Post
    How much benefit is there to a merge collector vs a std. There 5 to 10 times the $ of a regular collector, are they "that" awesome. I assume all your primarys need to be the "correct" length to take advantage of them. If all your primarys were the same length would that be considered perfect?? As far a std collectors go would a 19 or 20" collector make a little more than say a 14" collector, or wouldn't there be enough of a difference to worry about. I was just curious if there was an "ideal" length for those. Oh btw when it comes to slip on collectors what the best way to keep them fuggers on.lol
    Each application is going to be different , but mostly depends on rpm range and power. Jet boats tend to run better with a longer collector. Merge collectors are going to benefit in high power apps where you're looking for max performance, but in most moderate builds, you won't "feel" the difference.
    Most standard off the shelf jet boat headers with straight collectors work real well.
    Slip on collectors need welded tabs and bolts.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Senior Member Factory1's Avatar
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    There's alot to header science, more than one would think. I was talking with Domonic from Dominator headers this morning about some different aspects of header constuction. There are general rules of thumb though, example longer smaller diameter tubes on both primary and collector will favor lower rpm torque whearas larger dia. shorter tubes will make more top end h.p. For a high rpm drag motor I would want the 14" collectors, if I had a motor that didn't see much over 6k rpm pulling an occasional skier or tuber, I would want the 19" to 20"er's. Agreeing with Steel (wow did that come out of my mouth!!) You probably wont have any noticable improvement with the merge collector. In a pro stock type application where they are at nearly 3 h.p. per cu inch Im sure it is very noticable to them. Their headers are as finely tuned as can be. For a lake guy or bracket racer, not as crucial. One thing I don't like about slip-on's is that you will usually get some exhaust gases backing out from the joints dirtying up the headers. F1~

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    steelcomp was here
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    Agreeing with Steel (wow did that come out of my mouth!!)
    Thanks..that was nice.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Senior Member Josh@JBP's Avatar
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    Quote Originally Posted by H20MOFO View Post
    How much benefit is there to a merge collector vs a std. There 5 to 10 times the $ of a regular collector, are they "that" awesome. I assume all your primarys need to be the "correct" length to take advantage of them. If all your primarys were the same length would that be considered perfect?? As far a std collectors go would a 19 or 20" collector make a little more than say a 14" collector, or wouldn't there be enough of a difference to worry about. I was just curious if there was an "ideal" length for those. Oh btw when it comes to slip on collectors what the best way to keep them fuggers on.lol
    They cost the $ because of the labor involved to produce one. A standard collector is a pretty basic/simple design comparatively.
    (pic courtesy of Burns Stainless)

    you look at the picture and tell me they're not "that awesome", however as stated above they have they place. I've been told they are a little harder to tune, and i think they typically have a smaller outlet than a standard collector(for the same app).

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    Senior Member H20MOFO's Avatar
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    Thanks for all the answers... The collector that met an untimely death yesterday was 19" long, the dynatech and the others I've been looking at appear to be closer to 14". I think the 14" wouldn't look as good, sounds like the longer ones will perform a little better also. I probably shouldn't spend the money on these junkyard headers, but I kinda dig the way they look. As far as mounting them I know the way Steel said(tabs and bolts) is how most/all I've seen are done. Dynatech have a collector u tab kit part # 329-60-00320(to attach the collectors) , for the life of me I can't figure out how they would work. Anyways, thanks again...
    Another Hot Boat refugee

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    Cantard 71hallett's Avatar
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    hang on yo shorts....I get picture.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Cantard 71hallett's Avatar
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    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Cantard 71hallett's Avatar
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    There, thats better.
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    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by 71hallett View Post


    There, thats better.
    Are you trying to say my collector wouldn't be lying at the bottom of utah lake if I'd have used bolts lol. Btw those would look better with longer collectors.
    Another Hot Boat refugee

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    Half a bubble off jrork's Avatar
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    Quote Originally Posted by 71hallett View Post


    There, thats better.
    Yup Yup, that's how my setup is too. Still leak a bit of smooge but I'm still pig rich.

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    Cantard 71hallett's Avatar
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    Quote Originally Posted by H20MOFO View Post
    Are you trying to say my collector wouldn't be lying at the bottom of utah lake if I'd have used bolts lol. Btw those would look better with longer collectors.
    How long do you want!! I got 4-5 sets of these bastards.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

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    Cantard 71hallett's Avatar
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    And yes...it would still be on your boat.
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

  16. #14
    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by 71hallett View Post
    And yes...it would still be on your boat.
    Too funny...yeah rub it in.lol Seriously, if you have 5 sets, lets make a deal. The tubes on the ones I have are sooo thin, I know I couldn't weld tabs to em, (not saying it couldn't be done).
    Another Hot Boat refugee

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