Cold natured motor on a cold winters day??

[phillnjack2]

well said oldboat1
I do often see where people think its good to have a huge amount of water flowing out the relief ports and these people think its a good thing !!!
it is definitely not on idle, because it means the water is not staying in the cooling jacket long enough to cool the engine and keep correct temps.
running outboards with too low temp will wear the rings and bores far too quickly, and that can be a very expensive to repair..

the v4 thermostats are such a pain to get too and many people put far too much sealant around this area, it can cause the thermostats to get a bit of
sealant in them and not shut correctly, plus can also get into the bypass grommets and do the same.
.

Note just because thermostats are new dont mean they are good, I always always test them first in hot water to make sure they open and close at around
the right temp.
and always check to make sure they have the correct opening temp on them for your engine and climate....
this saves taking it all apart again and losing boating time..

 

[sutor623]

the v4 thermostats are such a pain to get too and many people put far too much sealant around this area, it can cause the thermostats to get a bit of
sealant in them and not shut correctly, plus can also get into the bypass grommets and do the same.
.

.

Again, you are talking about crossflow v4s. Totally different animal. They have a totally different bypass system. And just because your motor stays warm at a high idle, doesn't show anything about the temperature of the motor at cruise. This video is basically useless to prove your point, because everyone here agrees that at IDLE, the motor WILL reach and stay at 143 degrees. Plus being run in a bucket is creating a closed water system. It is when we are cruising and the high flow of very cold water runs THROUGH the bypasses, passing right by the thermostats, that the cylinder heads will be cooler than they are at idle. Next time I hit the lake (hopefully next week) I will run my temp gun on my heads. If I give it throttle (up to 2000rpms) in neutral for short bursts, it will actually bring the head temps DOWN.

Uggghhhhhhhh this is giving me a headache.

 

[oldboat1]

May be worth checking pressure relief springs later (summer running). See if cruising temps are in range when water and air temps warm up. Continued good luck with it.

 

[sutor623]

May be worth checking pressure relief springs later (summer running). See if cruising temps are in range when water and air temps warm up. Continued good luck with it.

Thanks partner. I will do some more test runs once I get that 25:1 oil out of there also. Next go-around I dont think I would break in an engine in the winter time...... Too paranoid...........

 

[flyingscott]

Additionally, Stant gives a pretty good explanation of basic t.stat function, among others -- describes the gradual opening at the rated temp, for those who don't seem to understand that, with full open maybe 15-20 degrees F above the rated temp. As usually understood and accepted, It continuously (and unobtrusively) cycles within that range to do the job:

That is a bunch of hooey. It is so easy to prove take a pot of water and boil it to lets say 143 deg that is where your thermostat is full open not 160 to 170. When I test my thermostat and the full open is not at it's rated opening I replace it. The thermostat opens at 143 your operating temp is different animal altogether that will be higher/lower depending on conditions.. All the thermostat does is try to keep a regulated temp it may be higher or lower than the opening temp.
For some reason people are mistaking thermostat opening temps for operating temps. The thermostat produces no heat of it's own all it can do is take the available heating and cooling sources and even them out no more no less. And if you want to see how fast a thermostat can react get away from your computer find a stove heat one up till it opens,then go pour cold water on it. I have never seen a thermostat rated partially open at this temp. So many places on this forum thermostat questions have been asked about testing. Every time we tell them open at it's rated temp not partially open not half open if it doesn't it's bad. One more question, why does the thermostat not have a hard time holding a consistent temp when it's cold. The demo proved nothing because you never saw the open maybe should have made a longer video

I am pretty sure I am the one who said the thermostat cycles in it's temp range and was told I was wrong. Somebody else says it to you so it's right. Your just here for the argument
The facts is the facts

everything I have said is so easy to check and prove but you won't. I can't help you anymore
With all this expertise here saying I am wrong one of you should have thermostat to test what I am saying.