Too cold for Bypass???

[Puckpimp71]

It's down to 50 in Sunny Miami, so do you think I should undo my coolant bypass? My car's been running a bit under the L in NORMAL but still above the C at the bottom. I THINK it's okay, but what do you Northerners do when the temp drops to the high 40's-low 50's???

 

[NotSoSlowSHO]

High 30's, to mid 40's here with no issues.

 

[yamahaSHO]

In Miami... I would not worry about it!! Here in dry Denver, AutoSHO has not had any problems and its been in the teens here in the last few weeks.

 

[Machspeed]

Ya really 35 degrees here so far no problem. You really dont need to worry about it, if you had a problem, just think about all the guys who live in snowy areas.

 

[masho95]

Puckpimp71:
It's down to 50 in Sunny Miami, so do you think I should undo my coolant bypass? My car's been running a bit under the L in NORMAL but still above the C at the bottom. I THINK it's okay, but what do you Northerners do when the temp drops to the high 40's-low 50's???

If your car is running under the L in normal for temperature I'd check for a stuck open thermostat. There's no way it should be running that low in 40-50 degree weather.

 

[AutoSHO]

Puckpimp71:
It's down to 50 in Sunny Miami, so do you think I should undo my coolant bypass? My car's been running a bit under the L in NORMAL but still above the C at the bottom. I THINK it's okay, but what do you Northerners do when the temp drops to the high 40's-low 50's???

Here's a big F U !!!

40-50 is shorts and a T-shirt weather... practically tropical. The last few times I've driven my car its been in the teens.

The only difference I notice is in sub-30 degree temps the gas pedal is a little stiffer, almost certainly from the TB shrinking from the cold. Never had it freeze though, or had any trouble with it returning to closed. I have considered running it again for the winter, but since the reason I bypassed it was because one of the hoses split and left me stranded, I'm hesitant to run the loop again. New hose would keep it reliable I'm sure.

 

[NotSoSlowSHO]

mine stays just below the L on the dash gauge. And I know the engine is up to temp (185-190) with my mechanical temp gauge. wink

Use the dash gauge for reference... but dont think it is accurate. Buy a real gauge if you want accuracy

 

[Dr. Tweak]

Is there anyone who has had a problem with the TB cooland bypass? Because it get really cold up here but I like the idea of not having to worry about them when taking my intake manifold off... shrug

 

[Puckpimp71]

masho95:

If your car is running under the L in normal for temperature I'd check for a stuck open thermostat. There's no way it should be running that low in 40-50 degree weather. </strong>[/QUOTE]
I thought about that and I'm going to do it tomorrow, but my car's temp only seems to really drop when I get on the highway. I know the orginal reason for coolant in the TB is to keep it from icing over in Alaska or where ever, I just wanted to double check on what you guys did during the winter. I'd gladly trade my sauna for your snow! I haven't played pond hockey in forever.

 

[projectSHO89]

Seems many misunderstand the purpose of the cooling loop in the throttle body.

It is there to prevent icing in the throttle body when operating under primarily humid conditions. Ambient temperature is of lesser concern than is the humidity. As air rushes through the throttle body, it is cooled by the Venturi effect. This cooling wrings the moisture out of the air and simultaneously cools the air. When conditions of both temperature and humidity are just right, the moisture can condense and freeze, causing ice to form in the throttle body.

The coolant loop runs hot (190-220F) coolant through the throttle body to keep it warm enough that ice formation should not be a problem in any operating environment.

If you want more information, talk to a piston engine aircraft mechanic about icing in carburators and fuel injection systems on their aircraft. Those guys have to do anything possible to prevent it.

Steve

 

[SHOZ123]

Yes not much recourse left at 5k feet...

I had my side draft carburetor slides freeze one day on a TR7. If it does freeze what happens is the throttle will either stick or slowly close and stay there. At any rate just shut the car off and sit for a couple of minutes, the heat soak is then your friend.

 

[BIGSHOMIKE]

I live in Utah, it has been down to 16 deg and I haven't had any problems with mine.

 

[JoeHoe_SHO]

Its snowy here this time of year...no problems with mine.

 

[krupt89]

Ive never heard of this bypass before, what is the advantages and disadfantages of it and how is it done


Edit: Just thougt about it for a minute and im guessing it keeps hot coolant from entering the TB, thus keeping it cooler shrug

<small>[ December 19, 2003, 08:30 PM: Message edited by: krupt89 ]</small>

 

[Puckpimp71]

krupt89:
Ive never heard of this bypass before, what is the advantages and disadfantages of it and how is it done


Edit: Just thougt about it for a minute and im guessing it keeps hot coolant from entering the TB, thus keeping it cooler shrug

You're right about what this mod accomplishes. Sorry to reply with this, but do a search and look for replies by SDPatt. He posted a great picture of how it's done and it's more complete than anything I can tell on my own. Best part is that it's free.