Quite a number of motorcyclist use Evans NPG coolant (waterless) with good results.I have used it in both my FJRs, currently use it in my Goldwing and three Busas.
It does not leave a residue in the engine nor cooling system.
It never has to be changed nor replaced.
It is recommeded for a low pressure cooling system.
For best results some people in warmer climates have removed their thermostats completely from their machines, others have modified the thermostat to increase flow, others have changed the radiator cap to a lower pressure one.
This issue is like the debate btw synthetic and nonsynthetic oil users, Which is better?
Research the product and try it
Having researched and tested both ethylene glycol and propylene glycol coolants (including the Evans NPG) I can attest to the following:
If the cooling systems work fine with Evans they would have worked even better with 50/50 ethylene glycol and water. There is nothing magic at all about Evans coolant........except that it makes him money.
Residue?? Since when does ethylene glycol leave a residue? Residue is from worn out coolant and corrosion. Keep fresh coolant in the system and there will be no residue. The EG is still good but the corrosion inhibitors are not after time.
There is currently no OAT based corrosion inhibitor package for propylene glycol coolants that I am aware of. Therefore, there is no long life PG coolant on the market. Therefore, PG coolants need to be replaced just like conventional EG coolants. They need replacing because the corrosion inhibitors are depleted not because the "coolant" itself has failed. Both EG and PG will last forever. Unfortunately the engine and cooling system will not last forever if you leave either coolant in them forever. If you think you can run Evans coolant forever you are fooling yourself.
If you take the stat out of ANY cooling system regardless of the coolant in it the engine will run cooler under most conditions. Why this is desireable is beyond my comprehension. Please explain. Higher coolant temps are desireable for engine life to get the oil warm enough (rapidly) to boil the moisture and fuel residue out of it. Running the engine too cold does it no favors.
It is also desireable to get the engine to a stable operating temperature to minimize thermal cycling and thermal fatigue. If there is no stat in the system then the coolant temperature is changing constantly as load/RPM changes. This is not good for the engine. The stat holds the engine at a stable temp so that the changes in load and speed simply affect the heat rejected from the system without affecting the coolant temp causing unnecessary thermal fatigue of the engine and gaskets from internal stress.
Evans is recommended for a low pressure system...???? What does this mean? Evans is smoke and mirrors with his 100 % PG coolants. True the boiling point is raised without the higher pressure. So what? Possibly useful in some unknown application with a non-pressurized cooling system (model A maybe??.) But, if you already have a pressurized cooling system there is absolutely no reason to switch to a lower pressure system. What possible rational drives the logic to go to a lower pressure cap and run a more viscous coolant that moves slower and has lower heat transfer capability simply "because" the boiling point is raised? There is no engineering reason for this other than to engineer your money to Evans for his product.
BTW...if you look at cooling systems for high capacity you find they do NOT use PG and they go to HIGHER pressures to get the capacity. 18 and 21 PSI are becoming very common for cooling systems in the automotive area. No OEM is lowering the pressure and using Evans coolant.
Evans also tried to tell the world that "reverse flow" systems worked better...that was pretty well shot down long ago.
Propylene glycol is much more viscous and moves much slower thru the system. this hurts the cooling unless you do something else to counteract it. They tell you to "open up the system" by removing the stat to make up for the deficiences of the coolant they just sold you. Duh...... At the very best you are back where you were with the proper operating stat and 50/50 EG/distilled water.
Too many of the "tests" and "testimonials" for PG and Evans are by people that have little or no knowlege of how a cooling system works. Their "tests" involve riding around the block and looking at the temp guage, not running system capacity at full load or any sort of high demand situation that really "tests" the cooling system.
