tychobrahe1911

After reading Mustang Performance Handbook by William R Mathis he states that the optimum cooling efficiency is at a mix of 75% ethylene glycol to 25% water. Now I've always heard 50/50 or 60/40 but.... Also he states optimum power is achieved at about a 200 degree coolant temp where that is returning to the radiator and that ford put in 192 degree thermostats stock. So since I'm doing some preventative maintenance I got a 195 degree thermostat along with an electric fan capable of 2500 cfm of flow and a control system set to turn on at 200 and off at 185. Now comes the issue of increased engine temp means increased oil temp which of course may lead to oil breakdown and poor lubricating properties. So you can either get a fancy oil cooler setup or why not just use a high quality synthetic oil like Amsoil which has a higher breakdown temp not to mention being far superior in every other way to anything out there. I'd appreciate any helpful comments, I'm just learning as much as I can and sometimes you get a lot of misinformation.

Jfsram

Stick with what you know. 50/50 or 60/40 for extreme conditions.

As for 200 being the optimum temp. Maybe for emissions and mileage. Cylinder heads (combustion chambers) and intakes are not happy on a hot running engine.

golden_eye

Is this a repost or something? I saw this exact topic posted here within the last 2 days or so [&:]

Anyway, I could swear that the 75/25 ratio is actually 75% water and 25% antifreeze. I'm pretty sure putting any more than 50% glycol will really reduce your cooling efficiency. Water is actually a better coolant than glycol, which is only there to prevent corrosion and freezing (I've also seen mention of lubrication for the pump/seals). I've seen several die-hard road racers that run only distilled water and Water Wetter additive and they end up with lower temps than with a glycol mix. I wouldn't do that in a daily driver though.

mjr46

just stick with a 50/50 mix and do a search next time.. this topic was just discussed 2 days ago

OnyxCobra

Okay so I'm not going crazy thinking I just saw this exact same topic. phew