What temp I/O guys?
 

Hey guys
What temp are you running on your engine. Think I'm high (temperature!) thought I'd poll you guys. What thermostat for a Merc 898?

Thanks
Pete

Re: What temp I/O guys?
 

160-165 for raw water cooled and 160-195 for fresh water cooled. The hotter you can run it, the better. But, since raw water systens are non-pressurized, they cannot operate at 195 because there will be localized hotspots above the boiling temp of water at 212 degrees. At 16 psi with coolant, systems can operate as high as 270 degrees before boiling so fresh water systems can operate hotter.

Re: What temp I/O guys?
 

my fresh water cooled runs about 135 -140 in 75-80 deg water.

Re: What temp I/O guys?
 

Rick, put a thermostat in your motor, you cylinders will thank you for it.

Re: What temp I/O guys?
 

i have the 5.7/260 i/o. i just had it hooked to the earmuffs and it seemed to run pretty hot. i hope its just my water pressure and hoping it runs cooler when in the water.
comments?

Re: What temp I/O guys?
 

Thanks GMC, I'll try that. I thought it seemed a little cold.

Re: What temp I/O guys?
 

should run all right on the muffs, but you can't race it or anything. But at Idle should be fine, at least mine was.

use to run 165 in it.