o/t pipes
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o/t pipes

  1. #1
    Member tinbender71's Avatar
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    Default o/t pipes

    Hi, I am thinking of getting some over transom pipes. Right now I have the standard logs and risers. How are they plumbed? Are they set up like headers, with water coming in at certain rpm, or are they a constant flow like I have now. Any pros or cons to them? Nothing wrong with what I have, just cant leave anything alone!

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    Senior Member jetboatperformance's Avatar
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    Water that would normal exit to the rizers would simply exit the logs and dump thru the Ots instead . The water runs full time no T valve or restictions or OB dump . We have on occasion plumbed them similarly to 4 tube water injected headers with a OB dump and "T" valve but not neccesary with a "modest cam" (duration @ 50 below 240 ) if you need a diagram post , pm or call Tom

    ps they should be worth some power but tend to be rather loud

  4. #3
    Sit N' Spin Jetaholic's Avatar
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    Quote Originally Posted by jetboatperformance View Post

    ps they should be worth some power but tend to be rather loud
    Tom isn't that part of the reason why we all love this shiat?



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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Texas you may be able to get away with the "loud" part, for a while, but many states (to include Okla and Ks,) have put noise laws into place.
    Enforcement is spotty, but you will, sooner or later, be having to buy muffler inserts, and still wonder if the lake-cops are going to hassle you at times.

    The only otjher "con" really is the added complexity of the plumbing system, controll valving to stop water to them near idle (so as to not suck any into a cylinder (reversion)), and the headers require far less water than the engine does, so an overboard dump that runs all the time, a few additional valvers to get teh water pressures & flows balanced, etc.

    I went from Logs to JACKETED headers, and kept the thru-hull outlets under my hood, noise-law quiet (enough), legal "muffling" (the water), simple plumbing (simpler than the logs actually), and no big chrome police-magnets in the wrong places, but, priceyyyyyyyyyy.

    If your engine is stock, headers help will be marginal, BUT, it will be ready if you plan upgrades.
    I made engine upgrades first, and the headers brought me 50HP.
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    The Man cordog009's Avatar
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    Got this from the Bassett headers site:



    Basically you will have two hoses coming out of the thermostat housing on top of the intake, one will dump out the back, the other will go to a ball&spring valve, a T that Bassett and Rewarder Headers sell, and from that T you have lines that run to each header. The ball/spring valve keeps water from constantly flowing into the headers at low rpm and idle. Once the pressure builds up from the RPMs, the water pressure on the ball inside presses it down and allows the water to flow to the headers..usually 1500-1800ish rpms. I can take a pic of my setup if you want.


    1984 Youngblood TX-19 SOLD

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    Senior Member DuaneHTP's Avatar
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    The diagram above is for "headers". What he is talking about is the S shaped over the transom pipes. They ususlly hook up to water just alittle different.

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    Water that would normal exit to the rizers would simply exit the logs and dump thru the Ots instead . The water runs full time no T valve or restictions or OB dump . We have on occasion plumbed them similarly to 4 tube water injected headers with a OB dump and "T" valve but not neccesary with a "modest cam" (duration @ 50 below 240 ) if you need a diagram post , pm or call Tom

    ps they should be worth some power but tend to be rather loud
    Jon Loud is good yes , noise tickets Bad !

    Heres the diagram (couldn't find it last nite , ,just substitute the last connection for the OT pipes vs the Snails ,if you desire to use a Tvalve to 'limit' the water to the OTs it can be plumbed in but again unless you have reversion isssues or concerns about reversion the more complicated plubing isn't neccesary RE mufflers , not much available for Old school OTs that not massively restrictive (Old "Auger" type) late style Rewarders take standard header inserts , Like Smokin said rules are tightening every where (environmentalist , Corey like Duane said that diagram for actual headers could be used but needs some more sofisticated plumbing IMO Tom

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    Member tinbender71's Avatar
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    Thanks for all the help, Ill probably just leave it alone. Really dont need anyone getting burned by them either. Every now and then a set comes up on Ebay for cheap, and just wonder what if....

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