Lightning exhaust
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Lightning exhaust

  1. #1
    I do all my own stunts. white tortilla's Avatar
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    Default Lightning exhaust

    wondering if anyone can give me any answers/numbers on HP loss running lighting headers on a jet, vs. OT bassets with water. i no i missed listing some type of info let me no if u have any info

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    Some guy obnoxious001's Avatar
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    You might try calling Jan at Lightning. I know he has done dyno testing on several size engines. He doesn't compare against them on his site: http://www.boatheaders.com/headersperformance.htm

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    northern member Canuc's Avatar
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    Quote Originally Posted by white tortilla View Post
    wondering if anyone can give me any answers/numbers on HP loss running lighting headers on a jet, vs. OT bassets with water. i no i missed listing some type of info let me no if u have any info
    you might be surprised . i've seen dyno sheets shared by guys testing lightinings to dry headers and they were almost the same for powerband and peaked within a hundred or so of each other .
    Quote Originally Posted by gn7 If your ran a cammer your odds of finishing WERE ZERO.

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    Senior Member bp298's Avatar
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    Quote Originally Posted by white tortilla View Post
    wondering if anyone can give me any answers/numbers on HP loss running lighting headers on a jet, vs. OT bassets with water. i no i missed listing some type of info let me no if u have any info
    grady, i wouldn't think there would be a lot of difference in header performance, except you have to run a lot more water through the lightnings to keep everything cool. with ot's, it's just mist... nowhere near as much water with the ot's...

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    Senior Member Need4Speed77's Avatar
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    I had a set of lightnings on my gullwing when I bought it and just didn't like them but did gps the boat with them. I ran 84 mph with the lightnings and 83.9 with the bassett water injected headers. Seems that there is not much loss at all. I know that is not an actual hp comparison but to me that is what matters most. The disparate on a dyno could be significant but performance is still there. Hope that helps.

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    Senior Member Boat 405's Avatar
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    Jan has lots of data from dyno testing. He has an in house dyno. O hp loss going from wet OT 's to lightnings. Now completely dry stacks is another story I think.
    Boat 405.

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    I do all my own stunts. white tortilla's Avatar
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    wow ok very interesting to hear, i was told possibly 30 hp losses and that got me worried. what to do i already had the holes filled in thru the transom, looks like im back to cutting or mabye wait and see where the swimsteps land

    btw thanks for the replys

  10. #8
    Senior Member Boat 405's Avatar
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    Quote Originally Posted by white tortilla View Post
    wow ok very interesting to hear, i was told possibly 30 hp losses and that got me worried. what to do i already had the holes filled in thru the transom, looks like im back to cutting or mabye wait and see where the swimsteps land

    btw thanks for the replys
    Keep in mind you will be limited on how much duration you can run with lightnings. That will cost you hp. If you have to go to a smaller cam from where you are now. I had to go to a smaller cam on my deal to accomodate going from completely dry stacks to lightnings. Although in the end I lost a mere 150 rpm. Went from 6150 to 6000 rpm same impeller. Now I'm going to throw a couple points of compression at it to get back to where I was.
    Boat 405.

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