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How High can I raise my engine

C

capt911

New member
Hello All,

I have a 1972 MX 16 with an 80's 135HP Merc 2.0 Black Max on the back.

It was running to low in the water and have raised it 2 1/2 inches so far and have about another 1/2 inch or one more hole I can raise it without having to drill now ones or buy a jack plate.

Running a straight edge off the bottom of the Vee the water line is around the 3rd water intake hole down. I have epoxied the top 3 holes so far and installed a water pressure gauge. I was wondering if someone knows how high can I run the engine and how many holes have to stay open to get enough water pressure to cool the engine?

I have about 10-12 psi now at full throttle and asking if anyone can advise me from experience how much higher I can go without having a low water intake on my lower unit?

I have a 23P laser II on it now and are having zero blow out issues and low RPM's as well so know I have lots of room to raise it some more.

Thanks all
 
There's no magic number. Also it depends on hull and distance from the transom. I wouldn't recommend drilling more holes in the clamp. For under $200 you can get a manual jack. If I had to guess I'd say with no setback I wouldn't put the propshaft higher than 3 or 4 inches below the bottom. Safest way is to start low, work your way up and when you lose pressure/get hot lower it down. I'm kind of experimenting with this with my Superboat and if you don't have a temperature gauge along with your water pressure you're risking expensive engine damage. I was seeing 7psi and after a 30 second WOT run the temperature started climbing. I took it off plane and held it at a high idle to bring the temp back down.

John
 
Viper1 I never got your message

capt911 said:
Hello All,

I have a 1972 MX 16 with an 80's 135HP Merc 2.0 Black Max on the back.

It was running to low in the water and have raised it 2 1/2 inches so far and have about another 1/2 inch or one more hole I can raise it without having to drill now ones or buy a jack plate.

Running a straight edge off the bottom of the Vee the water line is around the 3rd water intake hole down. I have epoxied the top 3 holes so far and installed a water pressure gauge. I was wondering if someone knows how high can I run the engine and how many holes have to stay open to get enough water pressure to cool the engine?

I have about 10-12 psi now at full throttle and asking if anyone can advise me from experience how much higher I can go without having a low water intake on my lower unit?

I have a 23P laser II on it now and are having zero blow out issues and low RPM's as well so know I have lots of room to raise it some more.

Thanks all
Click to expand...

Sorry Sammie PM just sent, never received your response to the last PM I sent you awhile ago :(
 
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