dry exhaust questions
03-27-2011, 06:10 PM
#11
Registered
iTrader: (4)
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
Charter Member # 55
Charter Member
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
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.
03-28-2011, 07:44 AM
#14
Registered
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!
but they are only 4" from the transom.. is that going to make all the difference?
