cooling water temp at 40deg?

[masterblaster]

we are riding in water temps in winter in the high 30s,with no cooling restictors running dual cooling the water temp out the pisser is still pretty much 40. what would be the best temp to run the motor by using cooling restricters?

 

[Matt_E]

I would be very very very careful running the motor like that.
You are over-cooling the cylinder while the pistons are getting blasted with combustion heat.
It's a recipe for a cold-seizure in short order. You want the water exiting the pisser to be at least 80 degrees or so.
Restrict the cooling outlets down to 2-3mm until you get the right temps.

 

[SUPERTUNE]

For water that cold, Yes, you should run restrictors.
Start at using some old needle valves drilled out at 7/32 (.218) in the incomimg lines, if still too cold go down to 3/16 (.187)

 

[Matt_E]

Start at using some old needle valves drilled out at 7/32 (.218) in the incomimg lines, if still too cold go down to 3/16 (.187)

Any particular reason you like restricting the incoming cooling line rather than the outlets?

 

[SuperJETT]

George Grabowski always recommended 120F out of the head, without a thermometer that's basically as hot as your water heater puts out, you can put your hand in it but not for long.

That's what I shoot for.

He also recommended restricting right before the pisser so you maintain pressure in the cylinder/head to minimize localized boiling at hot spots. Restricting on the supply side lowers the pressure in the cylinder/head and with very low flowrates (to get proper temps) you can have localized boiling which can lead to preignition inside.

George used to ride in 35F water and colder and never had issues with cold seizing/etc.

 

[beachedflunkey]

we are riding in water temps in winter in the high 30s,with no cooling restictors running dual cooling the water temp out the pisser is still pretty much 40. what would be the best temp to run the motor by using cooling restricters?

What's this "we are" biz talking about without cooling restrictors? What did gramps say, welcome to 2005 torr?

Nah I think what torr is asking is what temp is ideal? I always shot for 90-105 degree operating temperature in the Winter because that was most comfortable for redirecting the pissers into my wetsuit to keep me warm.

edit: yeah and what jett said

 

[Idok]

Any particular reason you like restricting the incoming cooling line rather than the outlets?

beat me to it!

 

[masterblaster]

Mark,almost none of the junkers are running resrictors. I was doing it from the first winter owning a b1 mainly for hand warmers,after wintering in FL for 3 yrs never needed to worry bout it.but yes the main reason for the ? is to find the right temp. 120 sounds hot to me.
Currently im restricting the water out of the head down to about .250 and diverting the other pisser off the pipe running a long smaller line up the pole with a T to both grips.I need the pressure to get the water up this far with flow,so restricting off inlet wouldnt work for me anyway,puzzling why anyone would do that?

Chuckie..How does a cold motor perform compared to a warmer one. My Turbo cars always run better cold before everything is heat soaked

 

[Papnschmilees]

generally the would preform better because colder air is more dense and you will notice a larger difference on a boosted engine

 

[masterblaster]

true but im wondering on a 2 stroke?

 

[Matt_E]

Motors run better with cooler air.
Cooler water will simply result in over-cooling the motor. One has nothing to do with the other.
You run a real heavy risk of seizing your motor.

 

[masterblaster]

at what temp does a seize begin to become a risk? cooler water means cooler engine and air in hull,cooler engine means cooler intake and carb,cooler intake and carb mean cooler air entering motor?

 

[Matt_E]

See post #2.

You are overcooling the cylinder while the piston is getting hot and expanding. The cylinder, because it stays cold, does not expand with it.
Result = seizure.

 

[masterblaster]

yes I understand the concept,just wonder on the temp.I think im over 80 deg out the pisser with the restic im runnin. Thats still a very large diff than the in cylinder temp im sure. But i wouldnt think 80 deg would cause a contraction at least.
Motor seems to hit hard as shizz at this temp,thought Id try and tweak it on temp though

 

[Matt_E]

You might want to get it a bit hotter than 80.

 

[Papnschmilees]

Another question to ask would be does running a 2 stroke with a cold block effect the oil in any way.

 

[SUPERJET-113]

I have dual cooling here in the desert for the hot, hot summer and in the winter I use 2 seats that are drilled out to 3mm and I put them both right after where it exits on top of the head on each end.
I also shut off all water going to the B pipe except the bottom screw. i barely crack that open maybe 1/4 turn.

A very dry B pipe breathing the cool air along with the engine temps up where they should be = a hard hittin MF! I wish I could run my B pipe that dry all the time.

Your loosing power by not getting the operating temps up where they should be.

 

[masterblaster]

never thought of drying out the pipe in winter?