dry exhaust questions

Reply Subscribe

Thread Tools

03-27-2011 | 06:10 PM

#11

endeavour32

Registered

Joined: May 2009

Posts: 3,895

Likes: 124

From: Chicago, IL; Onekama, MI

Quote:

Originally Posted by STRAIGHTPRIORITY

i do have switchable mufflers.... do u think i should not use them? i was more concerned with running in rough water and commin on and off the throttles...
risers are standard gil tails with standard slope.

In case you didn't know, Merc used the Gil exhuast on the HP 500. It used the standard tails and a lot of those engines were destroyed because of reversion. I don't know what the cam specs were on that engine but I don't think is was very radical. If it were me I would extend them back just to be safe!

03-27-2011 | 10:54 PM

#12

Griff

Charter Member # 55

Joined: Oct 2000

Posts: 20,241

Likes: 2,490

From: Omaha/LOTO

Quote:

Originally Posted by smokin' gun

ok guys because of my recent motor upgrade i have to go to dry exhaust because of the camshafts in the engines .my motors are 511ci tall decks 9.5 comp. w merlin heads reworked by champion race heads. brodix hv intakes .950 holleys .and comp cams solid rollers 680 lift w a 106 lobe sep .the cam lobe sep is the bad .i have all new gil manifolds and dry risers .my question is can i plug the fitting on the pipe and drill 3 holes in the end to let the water dump as ive seen on others .im assuming the boat may be a little quieter and i wont have to drill the holes in my hull for the dumps .im just guessing at this but hoping it might work and still not pull water up the pipe as they are 42 '' long being a trs app .or maybe someone has a better idea or has been here before .ive added some pics of the pipes as they are now length and the 2 small holes currently in them

How far do the pipes extend on the outside of the transom???? If they extend far enough, you could just cut the ends off.

On my CMI tails, they are dry all the way through the transom and extend about 4" past the outside of transom. Then the ends are baically just cut off. You can see the inner and outer pipes and the water comes out between them. The water never mixes with the exhaust gases.