How hot does a block heater get?
 

Hello. When a block heater is plugged in, how warm does it make the motor?

Thanx.

130 deg. give or take a little on mine.

after being on around 4 hours, mine always heats the coolant to right around 120.

I would think that being he is in So Cal it may get to 140 degrees or higher, depending on if hes parked outside, in a garage and his lows are above freezing and how long its plugged in for.

On mine when its about 5-15 it gets to ~70, above that about ~80-90... I only have it come on for 90 minutes... enough to help, but not enough to effect the power bill.

I plug mine in as soon as I pull in the garage (never gets below 50 in there) and unplug aprox. 12 hours later when I leave for work. This morning the attitude said 135 when i pulled out.
Mooseman

I took a block heater out of a motor to test it one time... left it plugged in on a bench... almost burnt the shop down [dummy]

they get very hot, hot enough to boil water for sure.


tks,
rjm

Plugged in overnite, i'll get to 130-140f..take off for work with the winter front closed they warm up real fast.[coffee]

For all the guys that leave them plugged in overnight.. one question.... does it sound like a dry start in the am?

I ask because the warmth will allow the oil to drain compleatly into the pan, were (unless you have an oil pan heater) it cools... so now it wont flow as well... seems to me that one would only want to plug it in the minimum time.... 100* block and 15* oil just seems like you could have issues.

Now I know in the summer your block can be 70-100 just from ambient, but so is your oil....

When it is installed, the large thermal mass of the coolant and block will prevent it from ever reaching boiling. The temperature that your workbench will reach is another matter altogether. Good thing it was an almost.

this mornin it was -16F and even plugged in with my weather front closed on my way into town this mornin my truck never got above 155*

thats why they make synthetic oils

Which helps, but they still drain....

Only once have I left mine plugged in for 24 hours and I don't recall it sounding like a dry start up, but then as you know I use synthetic oil.

how much does your all bills go up leaving her plugged in for hours at a time i am in wi here and its below 0 most the time so i plugg it in for an hour or so on a timer. just wondering. and just like ah64id said does it cause dry starts, in my race motors i have a pre oiler before i start it up.

keep the hellfires going 64, and make it rain with the 30mm