Trojan Boat Forum

good morning. I've got the 33ft carver with 440's one new one from bob and i'm very happy on how she runs .but i've got just a few ?? first i have a set up with two muffers on each motor so i have got 4 3' outlets on the back of the boat .the two for the one old engine have flappers on them .HOWEVER the two for the new one just are open at the back .i'm telling you this for maybe a reason? the new motor steams real good at 2200 rpm's but when i get her up out of the water she seems to stop a little .many tell me steam is okay
I have one of those temp reading guns where you aim at the motor ,and it reads 118 f on the risers of the new engine, However the rest on the motor run at about 140 to 169 F .. now on the other engine the older one the temp is alot cooler at the risers but i should say i can still hold on to both engine's risers with my hands after running the boat for about 30 min.. so maybe steam is okay or what do you all think.

is the water flow the same ? are the risers the same as the other engine ?
look for any crimps in the hoses any other restitions . are both engine able to turn up full rpm ?

well the two hoses that go to the risers on that motor. are not run to them the right way .and i thing the water is getting to them much harder that is one thing you may be right about. so i'll change them today. the water flow is the same other then, those flappers on the old engine outlets and none on the new one ,and that is the one that is steaming

Generally lots of steam means your engine is running hot. My 454 runs very cool, but, if I rev her to 1200-1400 rpm while flushing the engine on the trailer with a garden hose supplying the water, she starts steaming alot. The hose does not provide enuff flow for that many rpm, so I flush her at 800-1000rpm.

Clogged risers and riser blocks are common causes of too much exhaust steam. After you check all water flow inboard you might go for a dive and check the raw water intake grate for each engine on the bottom of the boat making sure they are open and clear. I agree that a little steam is ok but a lot of steam is not and needs more flow. If these grates are bent or clogged with bottom paint your engines may not get enough flow at higher RPM and/or higher speeds.

The amount of steam depends on the outside air temperature and relative humidity. You need to be looking at water flow out the exhaust and engine temp to tell if you have a problem.

well i used that heat temp reading tool and at the hotest area on the engine it was 167 f .. AND THE MANIFOLDS Were 110 F .. but the other engines manifolds were olny 103 f so i was thinking being that the ones that were 118f are the ones steaming ..maybe the flappers not being on that one .there letting the water out much faster? or maybe just a little build up inside of them two.??

carverman wrote:well i used that heat temp reading tool and at the hotest area on the engine it was 167 f .. AND THE MANIFOLDS Were 110 F .. but the other engines manifolds were olny 103 f so i was thinking being that the ones that were 118f are the ones steaming ..maybe the flappers not being on that one .there letting the water out much faster? or maybe just a little build up inside of them two.??

Engine temp seems to be spot on the thermostat setting... so nothing to worry about there. Do your temp gauges show you the difference between cold and running temp? If so then you have all you need to monitor them... look forward and boat.

7 deg F difference at that low manifold temp should be of no concern.
Are the manifolds the same design/model? Is the exhaust pipe run the same?
I wouldn't worry about these temp. and steam differences, I'd just get out there and enjoy the boat.

When you replace the risers, look around for an old set of Mercruiser stainless steel risers. They don't make them any more, but they cna be found.

Heres a search string to find them on Craigslist ...
http://www.google.com/search?hl=en&clie ... =&gs_rfai=

There are several mfgrs of stainless manifolds, including CMI, etc.
Hers' a new one I;ve never seen before - pretty slick!
http://www.maltaboating.com/Stainless_S ... ifolds.htm