Quote:
Originally Posted by 1968falconxt  actually dazza, an aircooled with the right design of cooling fins can also get rid of the heat very quickly so long as it has good air flow. they can cool as quickly as W/C engines. cags are poorly designed though
cags have nowhere near the same stroke as a W/C engine either |
but the thing is if its the same design barel on the same aircooled engine but with a watercooled top end it will produce more power
thats why most performance & race engines are liquid cooled
as long as they have a good pump & radiator they will take longer to heat up & run at one consistant temp
unlike a aircooled engine that tend to get hot fast & can only cool as low as the outside air will allow
so most aircooled engines run at higher temps they cant cool to the lower temps most liquid cooled engines run at so oil to fuel ratio is usually 25:1
a example is a outboard engine that alwayse has a fresh supply of cold intake water usually run fine @ 50:1 because of the much lower temps they need less lube in the mix
best way to see is to compare the running temps of a blata aircooled & a blata watercooled engine of the same design like the replicas or the older style blata engines the reps were copyed from,
the aircooled engine will run hotter not only top end but in the crank case where induction takes place this will effect the air density & how much air/fuel can be packed in
lower top end, cylinder & crank case temps will allow you to run less oil & will pack more air fuel mix in to the combustion chamber & give you alot more power than the same engine running at a higher temp
this is why the water cooled will win out almost every time performance & power wise as long as the cooling system is working properly
now a true rotary 2 stroke would be another story all together with 3 power strokes per revoloution compared to 1 powerstroke per revoloution you get with your standard 2 stroke engines but thats another debate
