Very thick when cold but the stock pump in the Subaru seemed to work fine. Little different than running straight Prestone Ethylene glycol in any case which gives the same freezing, boiling and corrosion properties as Evans which is straight Propylene glycol. You'll need a larger rad to hold the coolant temps down to the same level as an EG/ water mix though as they state in the literature.Ross,
I remember something about the viscosity difference supporting a different water pump impeller configuration in order to get the flow volume up. Can you confirm/refute this?
Evans has done a good job marketing the stuff but the fact remains, it's characteristics are nearly identical to undiluted EG except that it's not toxic like EG if ingested. A boiling point of 375F is irrelevant for most IC engines since they would melt or seize long before this point was reached. Pure glycol of any type is inferior from a heat conduction standpoint to water/ glycol mixes no matter what anyone may claim. Enough people have compared it back to back with conventional mixes to know the truth but even the published specs confirm this.I remember when Evans was running SCCA GT-1 Camaro test cars. The way it as originally designed to be used was reverse flow and with no pressure cap. They wanted the engines to run hotter. They were always fast.
Reverse coolant flow with super high CRs (higher peak chamber pressures and temps) would make sense using pure glycol since it has poor thermal conductivity. The same things could be achieved with EG and reverse flow so any advantages are due to layout and not the Evans per se. There is nothing magic in the Evans coolant.Just some historical perspective; I'm not interested in using it. It was back in the day of carbed engines and I think they were running way north of 14/1, I'm remembering 16/1 for some reason, compressions when everyone else was at 12/1. I think they were running coolant at 300 F. Dont know how many engines they ate up if any, but they were always close to winning the runoffs. Black Camero. I think they were always looking for an OEM deal and when Chevy started building reverse flow Corvette engines and the stuff did no magic in them, they were done.