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Exhaust can removal

The place for mechanics, racers, or anyone seeking engine-related technical help.
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steve3340
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Exhaust can removal

Post: # 21070Post steve3340 »

I removed can and drilled exhaust on a 200 black max. Will it run higher engine temp with no barrier for the water pump and tube? At idle with muffs 143f water coming out. Water pressure 4. Don't want to cook it. Also any temp gauge setup besides that dumb *** sending unit?

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alaskastreamin
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Re: Exhaust can removal

Post: # 21075Post alaskastreamin »

Removing the liner won't make it run any hotter. The water pump will get hotter due to the exhaust blowing on top of it but never had a problem. If you can rest your bare hand on top of the cylinder head, without it burning you it's ok. If it stings, it's too hot.
I add a second sending unit to the port head for a gauge. There is a wire for the second sending unit coming out of the control harness right at the plug. It's with the trim/ tilt motor, trim gauge wires. It's tan or tan/ blue. The other end is with the gage wiring under the dash. Hope this helps..
I also run a pressure gauge. FYI...
Ron Pratt
Okanogan, WA
Viper/ 2.5L 200 Merc (SOLD)
1991 "the last" Virage/ 15" 280
2003 9’ Mini Virage/ 15 hp Honda 4-stroke
1989 Voyager/ 300 Promax
1989 HST / 2.5L 200 Merc
http://www.prattcustoms.com
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steve3340
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Location: Western Ma
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Re: Exhaust can removal

Post: # 21076Post steve3340 »

Thanks. Ran it today and could set my hand on it without a sting or burn. I have water pressure gauge. Funny thought at the house 5 psi in water 20 psi. All I did was new T stats?

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alaskastreamin
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Re: Exhaust can removal

Post: # 21078Post alaskastreamin »

Wonder if there is a leak where water tube goes into water pump. Might check to see if rubber liner is still in top of pump cover. In the water,... the copper tube would be submerged. See what I'm thinking?
Ron Pratt
Okanogan, WA
Viper/ 2.5L 200 Merc (SOLD)
1991 "the last" Virage/ 15" 280
2003 9’ Mini Virage/ 15 hp Honda 4-stroke
1989 Voyager/ 300 Promax
1989 HST / 2.5L 200 Merc
http://www.prattcustoms.com
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Topic Author
steve3340
Getting my feet wet
Getting my feet wet
Posts: 98
Joined: Sep 24, 2011 11:24 pm
Location: Western Ma
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Re: Exhaust can removal

Post: # 21079Post steve3340 »

15 psi at idle with muffs. Just a dribble out tell tail. Blew air threw all hoses ???

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alaskastreamin
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Re: Exhaust can removal

Post: # 21081Post alaskastreamin »

If you are getting that much pressure at an idle, your tube is fine. I would look at the thermostats for restrictions. Pull them out and run motor to see if tell tale picks up. If you run in salt water the cowling fitting necks down and salt builds up.
I run a hose from each thermostat cover thru the cowling. No fittings. Just the 5/16" hose sticking out. That way I can see that both sides are flowing. The stream cycles from weak to strong as the 'stats open and close while idling. I swap out the right fitting for a spare left one so only one barb per cover. You can just cap the extra barb and zip tie if you go this route.
This is the best pict I can find.

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Ron Pratt
Okanogan, WA
Viper/ 2.5L 200 Merc (SOLD)
1991 "the last" Virage/ 15" 280
2003 9’ Mini Virage/ 15 hp Honda 4-stroke
1989 Voyager/ 300 Promax
1989 HST / 2.5L 200 Merc
http://www.prattcustoms.com
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