Baffled by apparent reversion issues with Lightning headers and mild cam
06-03-2014 | 06:42 PM
#32
Registered
Joined: Oct 2007
Posts: 8,439
Likes: 93
From: yorkville,il
budman,if you dont have any water in the oil you are worried for nothing.unless your headers are leaking you should be good.reversion happens at idle more than at rpm so quit worring,put the engine in the boat and GO BOATING,i am 99% sure you will be ok.i have seen your cam specs and real reversion should not be an issue.
06-03-2014 | 07:04 PM
#34
Registered
Joined: Sep 2009
Posts: 918
Likes: 5
I agree with Mike .If you are getting a teaspoon of water in the bottom of headers after shutdown, could just be sweat .That cam isn't near big enough and has wide lobe centers to be a problem .FWIW when I run a seawater equipped motor I let the motor take all the water it wants out of a three hundred gallon tank through 1 1/4" hose.You'd be surprised how quick it will empty the tank .If I were you I would stick the motor in and run your boat..JMO
budman,if you dont have any water in the oil you are worried for nothing.unless your headers are leaking you should be good.reversion happens at idle more than at rpm so quit worring,put the engine in the boat and GO BOATING,i am 99% sure you will be ok.i have seen your cam specs and real reversion should not be an issue.
06-03-2014 | 07:25 PM
#38
Registered
Joined: Nov 2004
Posts: 14,094
Likes: 3,684
From: On A Dirt Floor
What the hell is this crap below ?
Slip on ? Not welded ?
And holes spraying straight down into exhaust stream ?
Huh ? I don't get why, Yuk !
Yeh, I finally looked at your pics. I'm kinda horrified.
Slip on ? Not welded ?
And holes spraying straight down into exhaust stream ?
Huh ? I don't get why, Yuk !
Yeh, I finally looked at your pics. I'm kinda horrified.
Here are a couple of pictures of the divorced collectors. As you can see, they have 4 or 5 holes in the tip about 3/8", and one in the bottom for water to come out. I was watching it run and it looks like a waterfall coming out of there. Seems like too much water to me. Might try to post a video of it running when I get my boogered up spark plug hole fixed (another story...
)
I'm wondering if anyone can tell me for sure that the 5 holes go on top. Might have to call Lightning.
)I'm wondering if anyone can tell me for sure that the 5 holes go on top. Might have to call Lightning.
Last edited by SB; 06-03-2014 at 07:27 PM.
06-03-2014 | 08:21 PM
#39
Registered
Joined: Sep 2008
Posts: 441
Likes: 71
From: KCMO
Have you noticed any less water with the diverter closed and running through the Y pipe? If your Y pipe shutters are in good shape, it may very well help with your reversion. Shutters and flappers can have a check valve effect; allowing the engine to exhale while making it a little more difficult on the inhale(reversion). I'm only saying that this may lessen your reversion with your existing system. Any engine with valve overlap will have exhaust reversion, but I wouldn't think that your cam would be giving you big issues unless you have long idles through no wake zones. I wouldn't think your Lightnings would be contributing to your issue, BUT if you look at a CMI, the collector is dry and the water is plumbed into the tailpipe after a clever welded conical ring that looks to act as a dam as in the "turbulator" as found in the Merc 8.1 manifolds.
