Did you mean Fahrenheit ? 200 C is 392 F, or maybe you aren't talking coolant temp....

 

Some good info guys

 

How can I get a copy of the next installment and when is that coming out?

 

I just gave a quote from a reference paper ...if I'd written that paper I would've used Fahrenheit ...but then my paper wouldn't have been published because all scientific papers must now use SI units of measure!

The temperature in question is the temperature of the upper portion of the cylinder liner within an inch or so of TDC ...but this temperature is related to the coolant temperature in the head and block in that region.

The point is that according to the test data quoted increasing the ring and liner temperatures by 60*C near TDC ...which is an increase of 108*F ...increased the rate of wear by at least 100 times! So what's the mechanism to account for this seemingly disproportionate increase in wear rate for increasing temperature?

If the temperature of the upper portion of the cylinder liner increases by only 8*F ...which is the difference between a 203* stat and the OEM 195*F stat ...how much additional wear rate is incurred? Will switching to a 203* stat guarantee that the temperature of the upper portion of the cylinder liner will never increase by more than 8*F?

Well if you subscribe to the thread you'll be one of the first to know when new installments are added!

 

Subscribing....

 

I had heard some bad scooby stuff about the 203 stat some time ago. I decided to stick with the stocker. When I heard this a couple years ago there were alot of Neigh sayers.

 

Subscribing also, I've been told by numerous folks here to switchout my 203* and when the weather gets a little warmer I will. Also, Ford just came out with, not to long ago a new stock 192* temp. stat. I wonder whats the story on that, maybe Gene can enlighten us...

 

Subscribing

 

60*C =140*f
Increasing by 60*C (140*F) is from what as a baseline temp?
Most use a baseline of 200*F coolant with 235*F oil for testing.

Bill

 

So those 94, 95, and 96 powerstrokes with no intercooler, a smaller radiator, and the 203* ought to start dropping like flies any day now, right?

 

Every time this question comes up I always ask what the International version of the T444E uses. Do they have the 203 degree or something lower? Will going from Ford's stock temp of 195 down to a 192 lower fuel mileage?

 

Proud member of the IIABDFI club.

 

The binder version of the T444E uses a 203 degree stat.

 

As I recall my E99 came with a 192*F stat ...and when I had to replace my water pump the only replacement stat available from Ford was a 195*F stat ...and the only upper radiator hose available was the one that went through the center of the serpentine belt!

I think you need to recheck you're "math" or your "logic" or both ...because as I "correctly" stated a "60*C increase" in temperature is in fact a "108*F increase" in temperature!

As I also previously stated ...the temperature in question is the TRR temperature of the upper portion of the cylinder liner within an inch or so of TDC ...not the coolant temperature!

..."To avoid scuffing of the ring and liner typical TRR temperatures in diesel engines are kept near 200*C by circulating coolant through the cylinder head. Tests conducted at 260*C have shown that the rings and liners experience wear at least 100 times greater than at conventional TRR temperatures."...

So the baseline "TRR temperature" was ...200*C=392*F ...and the elevated "TRR temperature" that was tested for increased wear rate was ...260*C=500*F ...and the difference between the baseline and the elevated temperature was ...500*F-392*F=108*F!

Due to their lower FWHP those OBS engines rejected much less heat into their coolant compared to a late 99.5 truck! The graph below compares the 97 OBS truck to my E99 235 FWHP truck ...and a 99.5 auto is rated for 250 FWHP and the manual for 275 FWHP! ...and just because some of the OBS trucks haven't worn out yet doesn't dispute the "scientific fact" that higher temperatures cause higher wear rates!



..."The International engine that started it all was the 6.9 IDI. The indirect injection 6.9 was simple in design, naturally aspirated, made 170 hp @ 3300 RPM, and 315 lb-ft of torque @ 1400 RPM. The 6.9 was released in 1983 and gained instant popularity. So much in fact, that Ford had to ask International to increase production of the engines, a move that produced a great stream of revenue for both companies. Sometime in 1987, the bore of the 6.9 was increased from 4.00 in to 4.11 inches, and the 7.3 IDI was born. It was in 1994 that the 7.3 IDI became a direct injected, turbocharged diesel and proudly named, the Power Stroke"...

 

By not having an intercooler ...which blocks and heats the airflow going to the radiator on a 99.5 truck ...the OBS truck was better configured for running cooler!