Turbo with center risers or logs
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Turbo with center risers or logs

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    Senior Member sandeggo's Avatar
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    Default Turbo with center risers or logs

    I know the old drawthru banks system used logs. I am getting ready to plumb up my single turbo. Is there any reason I can't use a center rise exhaust? The ones I'm looking at are cast aluminum. The plan is to use the center riser and make the elbows out of stainless tube then Y into a t4 flange. Main reason is I don't want glowing headers in the boat.
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    Quote Originally Posted by sandeggo View Post
    I know the old drawthru banks system used logs. I am getting ready to plumb up my single turbo. Is there any reason I can't use a center rise exhaust? The ones I'm looking at are cast aluminum. The plan is to use the center riser and make the elbows out of stainless tube then Y into a t4 flange. Main reason is I don't want glowing headers in the boat.
    The Race Aero and Gentry systems are based on center rise manifolds. I am building my 622 twin turbo deal based around some old Drake manifolds with 21/4" equal length runners.
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    Senior Member Fireguy's Avatar
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    I was advised against using the Indmar style manifolds that I have on the shelf now. I ended up building my own stainless headers. The manifolds I have are not water jacketed near the port and arent really that thick between the exhaust and water. Temps in the back seat are okay. Im going to modify the heat shields more, but as they are, they are so so. With a little work, the heat is not a big deal IMO.
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    Senior Member sandeggo's Avatar
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    Well I dug a little deeper and it turns out the center risers I planned to use are cast steel so that's even better.
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    I have center rise Drakes also (aluminum). The premis is that the water cooled manifolds will pull heat from the exhaust stream. Which they lm sure they will, how much l think is marginal. The heat also drives the turbin along with the flow.
    But having the turbin wheel 18-20 inches from the exhaust valve, how much heat
    can be disapated at 3-7k rpm? I think the amount of flow and speed threw the exhaust mainfold will be too fast to have an impact.
    In an race only application, this would not be the direction l would choose. But, a lake hot rod, l woukd rather not have the heat in the boat.
    Just my .02. Be safe, schick
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    Quote Originally Posted by sandeggo View Post
    I know the old drawthru banks system used logs. I am getting ready to plumb up my single turbo. Is there any reason I can't use a center rise exhaust? The ones I'm looking at are cast aluminum. The plan is to use the center riser and make the elbows out of stainless tube then Y into a t4 flange. Main reason is I don't want glowing headers in the boat.
    Can't think of any reason you can't use center rise manifolds. The design is perfect for twins, but there's no reason you can't plumb them together for a single. The crossover will get hot as hell, you might consider water jacketing it too. A little more complex, but a lot cooler if you're worried about people getting burns.
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    LOVE that exhaust design!

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    Senior Member sandeggo's Avatar
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    Yeah it's a lake only deal, who knows I may run it on the clocks after it's together. I'll probably double wall the crossover and jacket it as well, depends how well it runs.
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    Quote Originally Posted by sandeggo View Post
    Yeah it's a lake only deal, who knows I may run it on the clocks after it's together. I'll probably double wall the crossover and jacket it as well, depends how well it runs.
    Maybe wrap it in 3/8 copper tubeing, then wrap that in exhaust wrap (the crossover). Run water threw the tube. Prob wont cool the crossover, but would keep the heat out of the engine area. Would be pretty easy to try.
    Last edited by schick; 12-30-2013 at 03:36 PM.
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    Kevin, I sure hope you pull this off. I was extremely close to pulling the trigger on going twin turbo but the heat issues really worried me. With your talent, I'm sure you can do it.
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    Better do what u can to keep some heat and velocity in the crossover pipe.been there done that and with a big single on a 5.3, better have the ability to bring up egts fast if you plan to race it. put twins on it now and dont bullshit.pm me if ya wanna turbo recommend.ive gta hookup

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    The biggest challenge to the center riser exhaust manifolds is going to be the time when you want to pull the valve covers off.

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    Quote Originally Posted by jrork View Post
    Kevin, I sure hope you pull this off. I was extremely close to pulling the trigger on going twin turbo but the heat issues really worried me. With your talent, I'm sure you can do it.
    Dont you have a 21' Daytona? I too was worried about the heat, but there is enough room in a 21' that its not a huge ordeal. The girls in the back said it got warm if I was in boost for an extended period of time, but not totally unbearable. My heat shields leave #1 and 2 cylinder header tubes somewhat exposed and that is where the heat is coming from. My shields pretty much only cover the outboard side and I have painted valve covers with no problems.
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