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tappskier
10-18-2008, 01:17 PM
94 prostar 190 w/ throttle body injection motor, does this engine have one or two thermostats? Thanks

JimN
10-18-2008, 01:48 PM
One. The only motor tehy used that had two was the LT-1.

jimmer2880
10-19-2008, 07:08 PM
What JimN said... 1. Should be a 142 degree Marine.

André
10-19-2008, 07:18 PM
What JimN said... 1. Should be a 142 degree Marine.

I totally disagree.
I think it's 143...;)

JimN
10-19-2008, 08:07 PM
Nope! 160 degree for all of the non LT-1 injected motors.

Footin
10-19-2008, 08:07 PM
I say a 160 degree.

TMCNo1
10-19-2008, 08:10 PM
I totally disagree.
I think it's 143...;)


We need a official ruling on this, where's Walter?:rolleyes:

JimN
10-19-2008, 08:22 PM
Who's Walter?

TMCNo1
10-19-2008, 08:56 PM
Who's Walter?
JimN meet Walter, Walter meet JimN!
41432

JimN
10-19-2008, 09:52 PM
That's who I though Walter is.

Great stuff.

Ski-me
10-20-2008, 12:32 PM
My owner's manual says: "142 stat"

JimN
10-20-2008, 12:41 PM
My owner's manual says: "142 stat"

You didn't see the wink in Andre's reply, did you?

Ski-me
10-20-2008, 04:03 PM
You didn't see the wink in Andre's reply, did you?

Yea I saw that one....

Didn't you say the Non LT1 took the 160 though?

JimN
10-20-2008, 04:31 PM
I did and your profile shows that you have an LT-1, but the scan you posted didn't show which motor the manual was for. A 142 thermostat on most engines is a waste of gas and efficiency. A cold motor is not efficient, at all and the main, if not only, reason for the 142 degree 'stat in the LT-1 is to avoid thermal shock since it has aluminum heads and reverse cooling. The MC service trainers told us to use a 160 degree 'stat unless it was a high temperature location, and a higher temp unit can be subbed, but not over 194 degrees. Heat soak was causing overheat indication in 100+ degree temperatures.

Ski-me
10-20-2008, 05:31 PM
I did and your profile shows that you have an LT-1, but the scan you posted didn't show which motor the manual was for. A 142 thermostat on most engines is a waste of gas and efficiency. A cold motor is not efficient, at all and the main, if not only, reason for the 142 degree 'stat in the LT-1 is to avoid thermal shock since it has aluminum heads and reverse cooling. The MC service trainers told us to use a 160 degree 'stat unless it was a high temperature location, and a higher temp unit can be subbed, but not over 194 degrees. Heat soak was causing overheat indication in 100+ degree temperatures.

Top scan is standard engine (142 degrees)
Bottom scan is LT1 option (142/160 degrees)

I do understand your point and it makes sense. All I was doing is posting what the owner's manual says. I'm not saying if it's right or wrong for each specific situation.

redlightning
04-07-2009, 10:01 PM
so is the correct answer 160 degree? I have a 94 225 vrs and i am planning to replace the t-stat while getting the boat ready for the season. Why are there two mentioned in the manual. Mine also shows the 142/160 t-stat.

JMann
04-07-2009, 11:24 PM
so is the correct answer 160 degree? I have a 94 225 vrs and i am planning to replace the t-stat while getting the boat ready for the season. Why are there two mentioned in the manual. Mine also shows the 142/160 t-stat.

I'm going to ask the same questions but for my 1991 ps190 with a ford 351. What temp t-stat should I use?
Thanks