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Temp difference - front to back of block
#1189927 Mon Nov 07 2016 03:05 AM
Joined: Jan 2010
Posts: 4,610
D
DADS50 Offline OP
Shop Shark
1950 chevy 3100
Engine
1954 235 z motor

Been driving the truck to work the last 6 weeks or so.
Ive noticed I've been puking just a little coolant and have to top off after about the 4th trip

Gauge reads normal. 160 with a 160 stat
Up to 180 going up the hill on the way home then levels off back to 160.
7lb cap
Raditor 4 years old , U.S. Radiator


Today when I got home I took temp reading with one of those laser deals

Front of block read 170
Rear of block read 195

Is this normal?




Re: Temp difference - front to back of block
DADS50 #1189938 Mon Nov 07 2016 03:33 AM
Joined: Feb 2004
Posts: 21,205
H
Boltergeist
Yes, probably. Try installing a coolant recovery tank so the overflow gets sucked back into the radiator as the engine cools down again. That can also be caused by keeping the radiator overfilled- - - -leave a couple of inches of expansion room in the top tank, with the coolant just above the level of the tubes.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Temp difference - front to back of block
DADS50 #1190132 Tue Nov 08 2016 01:30 PM
Joined: Jan 2010
Posts: 4,610
D
DADS50 Offline OP
Shop Shark
Thanks

Just thought it was odd that this started happening after not driving much this summer.

I don't know what the danger temp is on the block

I hadn't had a need for a recovery tank since I put the truck back together in 2010
Should be simple to install

Re: Temp difference - front to back of block
DADS50 #1190146 Tue Nov 08 2016 03:53 PM
Joined: Dec 2008
Posts: 1,490
P
Shop Shark
It's almost universal in L6 engines since the incoming cold water reaches the front cylinder jacket first, and is warmed by each cylinder in turn as it passes down the block.
No easy cure, but it's been dealt with by Chrysler in the Spitfire and Cummins in the Dodge diesel.

Re: Temp difference - front to back of block
DADS50 #1190150 Tue Nov 08 2016 04:22 PM
Joined: Feb 2004
Posts: 21,205
H
Boltergeist
A 7# cap raises the boiling point of the coolant to 233 degrees at sea level. If you're hearing gurgling in the system, that means at least some places inside the water jacket are getting a lot hotter than the laser is showing. Since the temp inside the cylinders approaches 2,000 degrees under load, that's not surprising. Just put a puke tank on the system, and stop obsessing about it. A dangerous overheat situation will result in a boil-over, not a little dribble of coolant.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Temp difference - front to back of block
DADS50 #1190163 Tue Nov 08 2016 05:43 PM
Joined: Jan 2010
Posts: 4,610
D
DADS50 Offline OP
Shop Shark
Sounds good

Im not an experenced engine guy so Id thought Id ask



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