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01-21-2011, 06:40 PM
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#1
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Senior Member
Join Date: Feb 2003
Location: Jarrell, TX 76537
Posts: 4,501
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Thermostat
Okay guys put your thinking cap on. Which of the 2 180 degree thermostats below fit the 8.1L Chevy Votec and which one fits the 5.7L Dodge Hemi?
During my research on this subject I found out there are 3 levels of levels of thermostats.
1) Standard - If it fails it may be open, closed or in-between.
2) Failsafe - If it fails it stays open.
3) High Flow - flows up to 50% more than the standard version.
__________________
Dale
AKA - Oemy
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01-22-2011, 09:54 AM
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#2
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Moderator Emeritus
Winnebago Owners Club Workhorse Chassis Owner Coastal Campers Carolina Campers
Join Date: Jan 2000
Location: Conway, SC
Posts: 23,641
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Quote:
Originally Posted by oemtech
Okay guys put your thinking cap on. Which of the 2 180 degree thermostats below fit the 8.1L Chevy Votec and which one fits the 5.7L Dodge Hemi?
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√ The one on the right is the Workhorse thermostat. 
You should have made a Poll! 
__________________
03 Adventurer 38G, Workhorse W22
F&R Track Bars, Safety+ , Ultrapower, Taylor Extremes, SGII
TST 507, Blue Ox, SMI, Koni FSD, CrossFire
RV/MH Hall of Fame - Lifetime Member
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01-22-2011, 11:43 AM
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#3
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Senior Member
Join Date: Feb 2003
Location: Jarrell, TX 76537
Posts: 4,501
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Yep... The WH stat is 48mm and the Hemi is 63mm. Plus, the Hemi stat a small bypass hole via little brass rivet.
Amazing that an engine that 45% smaller has a stat that is 33% larger.
__________________
Dale
AKA - Oemy
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01-22-2011, 11:51 AM
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#4
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Senior Member
Workhorse Chassis Owner
Join Date: Mar 2007
Location: Pikeville, NC
Posts: 1,775
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Oemy-
What are you doing messing around with a Hemi?
__________________
Max H,
2002 Newmar Mountain Aire, 37', 3778, W-22, 8.1 Vortac, Ultra Power upgrade, CAI (cold air intake), Taylor wires, colder plugs, Koni shocks.
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01-22-2011, 11:57 AM
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#5
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Senior Member
Join Date: Feb 2003
Location: Jarrell, TX 76537
Posts: 4,501
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I sold this...
and
Bought bought this...
2010 Dodge Challenger 5.7L Hemi with a 6 speed Tremec
__________________
Dale
AKA - Oemy
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01-22-2011, 01:08 PM
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#6
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Senior Member
Join Date: Oct 2002
Location: Madison, MS
Posts: 10,527
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WOW. Congrats Dale, good looking muscle car.....the guy next to it, not so much  Ed
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01-22-2011, 01:43 PM
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#7
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Sep 2008
Location: Shadow Hills,CA 91040
Posts: 3,038
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Quote:
Originally Posted by oemtech
Yep... The WH stat is 48mm and the Hemi is 63mm. Plus, the Hemi stat a small bypass hole via little brass rivet.
Amazing that an engine that 45% smaller has a stat that is 33% larger.
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Thats why one engine has more problems and the otherone doesn't. A car engine is working to hard in a Motorhome.
PS Nice Nice car.
__________________
NOTE; I am not responsible for typos, poor grammer or misspelled word !
04 Itasca, Meridian 34H, 330 Cat/2003 CR V Toad
1933 Ford 3 Window,as seen in Bye Bye Birdie
Pvt. E1 Retired, Shadow Hills,Ca.
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01-22-2011, 02:16 PM
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#8
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Senior Member
Join Date: Feb 2003
Location: Jarrell, TX 76537
Posts: 4,501
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Quote:
Originally Posted by edgray
WOW. Congrats Dale, good looking muscle car.....the guy next to it, not so much Ed |
Yea... I hear that Ed.
OBTW - The wife was not to pleased either as the PT Cruiser was her car, so to speak, and the Challenger is a 6 speed stick that she can't drive.
__________________
Dale
AKA - Oemy
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01-22-2011, 02:25 PM
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#9
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Senior Member
Join Date: Feb 2003
Location: Jarrell, TX 76537
Posts: 4,501
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Quote:
Originally Posted by Chuck 1935
Thats why one engine has more problems and the otherone doesn't. A car engine is working to hard in a Motorhome.
PS Nice Nice car.
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That's why I posted the question...
I just got done installing the one in the Hemi and took me all of 10 mins. I can't image how long it will take on the motor home considering I will have to take the dog house off. I lost maybe a pint of coolant that I did not catch in a baggy.
It took longer to update the ECM for the fan temps. I used a Diablo Predator to make the changes. While I was in there I reset the revlimiter to 6,000 RPMs (6,500 is max) and the top speed to 150 mph from 140 (160 is max)
__________________
Dale
AKA - Oemy
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01-22-2011, 07:10 PM
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#10
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Senior Member
Workhorse Chassis Owner
Join Date: Jun 2006
Location: Northwestern Montana
Posts: 3,513
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Dale, do you still have your big Chevy?
Dieselclacker
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01-22-2011, 08:01 PM
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#11
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Moderator Emeritus
Winnebago Owners Club Workhorse Chassis Owner Coastal Campers Carolina Campers
Join Date: Jan 2000
Location: Conway, SC
Posts: 23,641
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Quote:
Originally Posted by oemtech
Amazing that an engine that 45% smaller has a stat that is 33% larger.
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Perhaps the smaller cooling system on the Hemi requires more rate of flow?
That said I would think that aside from the radiator and I have the coach heater around the water heater (motor aid), they should be pretty close in capacity.
__________________
03 Adventurer 38G, Workhorse W22
F&R Track Bars, Safety+ , Ultrapower, Taylor Extremes, SGII
TST 507, Blue Ox, SMI, Koni FSD, CrossFire
RV/MH Hall of Fame - Lifetime Member
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01-22-2011, 08:28 PM
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#12
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Senior Member
Join Date: Feb 2003
Location: Jarrell, TX 76537
Posts: 4,501
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Quote:
Originally Posted by dieselclacker
Dale, do you still have your big Chevy?
Dieselclacker
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You mean this one.........
Yep, just need to find some time to start working the projects I have parts for.
OBTW - I plan to put 180 T Stat in that one also.
__________________
Dale
AKA - Oemy
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01-22-2011, 08:36 PM
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#13
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Senior Member
Join Date: Feb 2003
Location: Jarrell, TX 76537
Posts: 4,501
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Why add a 180 T Stat... Better over all performance. Dyno runs have shown that engines start to get heat soak at about 200 degrees and that costs you HP/TRQ.
The 5.7L Hemi has a stock 203 degree T Stat... and the fans are set at 217 and 226. I reset them to 190 and 199 after the 180 was installed. A short road test with a SG II hooked up showed 188 degrees just cruising at 65 and outside air was 62.
__________________
Dale
AKA - Oemy
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01-23-2011, 07:06 AM
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#14
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Senior Member
Join Date: Oct 2002
Location: Madison, MS
Posts: 10,527
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Quote:
Originally Posted by oemtech
Why add a 180 T Stat... Better over all performance. Dyno runs have shown that engines start to get heat soak at about 200 degrees and that costs you HP/TRQ.......
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OK Dale, I'll bite. What is "heat soak" and how does it affect HP/TQ ? Thanks, Ed
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