Although I have a C27, this may occur on larger boats as well. I was wondering if anyone has experienced "squatting" when under power. My exhaust thru hull is only about 2-3" above the waterline and becomes completely submerged when powering. The boat has a Universal 14hp diesel. I've never passed 2200 RPMS during the trip up to Boston last weekend. I did have two 5 gal jerry jugs in the lazerette but that shouldn't make that much difference and I only weigh 145lbs. Has anyone relocated their exhaust thru hull and if so, where did you move it? Centerline higher, further outboard? Any ideas would be helpful.
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completely submerged???
I wonder if mine does on my Catalina. It doesn'r sound good. Diesel don't like water!
I wonder if mine does on my Catalina. It doesn'r sound good. Diesel don't like water!
Move the weight forward....
... lash the jerry jugs to the lifelines just forward of the shrouds and see if that makes any difference. I have an outboard and the "squatting" can be minimized by changing the tilt of the motor to maintain a perpendicular shaft angle. Power boats use trim tabs so I also installed a set of "dol-fins" to the OB to help the trim and prop effeciency...but I got most result by readjusting the tilt. I realize that you have an inboard and have limited, if any, adjustment. That is why I'm recommending repositioning the weight if you're going to be motoring a lot. Besides jerry cans, look for other heavy items in the rear area such as ground tackle, batteries etc. The exhaust pipe should have a loop in it to inhibit water intrusion. I think it would be cost effective to re locate the ballast before such a major modification that doesn't even solve the basic problem.
... lash the jerry jugs to the lifelines just forward of the shrouds and see if that makes any difference. I have an outboard and the "squatting" can be minimized by changing the tilt of the motor to maintain a perpendicular shaft angle. Power boats use trim tabs so I also installed a set of "dol-fins" to the OB to help the trim and prop effeciency...but I got most result by readjusting the tilt. I realize that you have an inboard and have limited, if any, adjustment. That is why I'm recommending repositioning the weight if you're going to be motoring a lot. Besides jerry cans, look for other heavy items in the rear area such as ground tackle, batteries etc. The exhaust pipe should have a loop in it to inhibit water intrusion. I think it would be cost effective to re locate the ballast before such a major modification that doesn't even solve the basic problem.
They all do it, but weight makes a difference
Hi Tim-- My 27 squats under power as well--they all do. Weight can make a difference, though. That ten gallons of fuel you have in the lazerette weighs 70 pounds, give or take. That's not a lot, but if you can move it forward, you'll lift the stern and lower the bow--sort of a "double benefit". On my boat, I've found that having a couple of passengers shift to the forward end of the cockpit instead of the aft end makes some difference, too. Of course, if you are single handed, there isn't much you can do to relocate yourself, but check for any heavy objects that can be repositioned. Randy
Hi Tim-- My 27 squats under power as well--they all do. Weight can make a difference, though. That ten gallons of fuel you have in the lazerette weighs 70 pounds, give or take. That's not a lot, but if you can move it forward, you'll lift the stern and lower the bow--sort of a "double benefit". On my boat, I've found that having a couple of passengers shift to the forward end of the cockpit instead of the aft end makes some difference, too. Of course, if you are single handed, there isn't much you can do to relocate yourself, but check for any heavy objects that can be repositioned. Randy
Can be a problem,,
We lost the exhaust pipe at the manifold on our C-27 (A-4 engine) last weekend. When we took a tow from our friends power boat we started filling up with water. Needless to say it gets your attention to see 3 inches of water sloshing over the floor! Turns out the exhaust hole was under water while towing and the water was flooding back through the pipe into the engine compartment. A rag and a bilge pump saved the day. Mike
We lost the exhaust pipe at the manifold on our C-27 (A-4 engine) last weekend. When we took a tow from our friends power boat we started filling up with water. Needless to say it gets your attention to see 3 inches of water sloshing over the floor! Turns out the exhaust hole was under water while towing and the water was flooding back through the pipe into the engine compartment. A rag and a bilge pump saved the day. Mike
Any photos of exhaust hose modification?
Although I do have a an inverted U shaped pipe exhaust elbow, I'm wondering if water could still sipon down the exhaust hose to my water lift muffler, and up the hose and over the top of the pipe elbow. The little rubber flapper on my exhaust pipe is missing and I do have the metal replacement from CD, but haven't had time to install it on the mooring yet. Does anyone have a complete loop in their exhaust hose and if so, how much would that cost vs. buying a valve to install just inboard of the transom I could close while sailing? Photos are worth a 1,000 words and would be much appreciated if anyone has any. Thanks. Tim
Although I do have a an inverted U shaped pipe exhaust elbow, I'm wondering if water could still sipon down the exhaust hose to my water lift muffler, and up the hose and over the top of the pipe elbow. The little rubber flapper on my exhaust pipe is missing and I do have the metal replacement from CD, but haven't had time to install it on the mooring yet. Does anyone have a complete loop in their exhaust hose and if so, how much would that cost vs. buying a valve to install just inboard of the transom I could close while sailing? Photos are worth a 1,000 words and would be much appreciated if anyone has any. Thanks. Tim
Any photos of exhaust hose modification?
Although I do have a an inverted U shaped pipe exhaust elbow, I'm wondering if water could still sipon down the exhaust hose to my water lift muffler, and up the hose and over the top of the pipe elbow. The little rubber flapper on my exhaust pipe is missing and I do have the metal replacement from CD, but haven't had time to install it on the mooring yet. Does anyone have a complete loop in their exhaust hose and if so, how much would that cost vs. buying a valve to install just inboard of the transom I could close while sailing? Photos are worth a 1,000 words and would be much appreciated if anyone has any. Thanks. Tim
Although I do have a an inverted U shaped pipe exhaust elbow, I'm wondering if water could still sipon down the exhaust hose to my water lift muffler, and up the hose and over the top of the pipe elbow. The little rubber flapper on my exhaust pipe is missing and I do have the metal replacement from CD, but haven't had time to install it on the mooring yet. Does anyone have a complete loop in their exhaust hose and if so, how much would that cost vs. buying a valve to install just inboard of the transom I could close while sailing? Photos are worth a 1,000 words and would be much appreciated if anyone has any. Thanks. Tim
a simple test
I had a problem with a new boat that was siphoning water into the engine due to a vent that was placed to low. The muffler was also installed tilting the wrong way. It was easy to tell that something was wrong because the engine always fired right up when the boat was cold but if I had been motoring (especially with a bit of heel or in a rough sea), and then turned off the engine it would be hard to start. It turns out that it was hard to start because it first had to pump the water out that had siphoned in. This is a huge problem. Try turning off your engine after motoring for a while and listen to how it sounds when you restart. If it fires right up, then you probably do not have a problem. You can also tap on your muffler to tell if it is full of water. There should even be a small drain screw on your muffler.
I had a problem with a new boat that was siphoning water into the engine due to a vent that was placed to low. The muffler was also installed tilting the wrong way. It was easy to tell that something was wrong because the engine always fired right up when the boat was cold but if I had been motoring (especially with a bit of heel or in a rough sea), and then turned off the engine it would be hard to start. It turns out that it was hard to start because it first had to pump the water out that had siphoned in. This is a huge problem. Try turning off your engine after motoring for a while and listen to how it sounds when you restart. If it fires right up, then you probably do not have a problem. You can also tap on your muffler to tell if it is full of water. There should even be a small drain screw on your muffler.
a simple test
I had a problem with a new boat that was siphoning water into the engine due to a vent that was placed to low. The muffler was also installed tilting the wrong way. It was easy to tell that something was wrong because the engine always fired right up when the boat was cold but if I had been motoring (especially with a bit of heel or in a rough sea), and then turned off the engine it would be hard to start. It turns out that it was hard to start because it first had to pump the water out that had siphoned in. This is a huge problem. Try turning off your engine after motoring for a while and listen to how it sounds when you restart. If it fires right up, then you probably do not have a problem. You can also tap on your muffler to tell if it is full of water. There should even be a small drain screw on your muffler.
I had a problem with a new boat that was siphoning water into the engine due to a vent that was placed to low. The muffler was also installed tilting the wrong way. It was easy to tell that something was wrong because the engine always fired right up when the boat was cold but if I had been motoring (especially with a bit of heel or in a rough sea), and then turned off the engine it would be hard to start. It turns out that it was hard to start because it first had to pump the water out that had siphoned in. This is a huge problem. Try turning off your engine after motoring for a while and listen to how it sounds when you restart. If it fires right up, then you probably do not have a problem. You can also tap on your muffler to tell if it is full of water. There should even be a small drain screw on your muffler.
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