| Ariel Red Hunter |
09-28-2017 12:31 PM |
Quote:
Originally Posted by pistolclass
(Post 266003)
wow ARH you are truly ole skool. my CR80 back in the 80s was watercooled. most of it was aluminium so the weight was small. It kept my high spinning 2 smokes engine heat under control.
I say dont add it unless you need it, but in order to make bigger power isn't it needed?
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No, it is not needed for more power. Possibly for the ultimite 16,000 rpm power with a power band about equal to a humming bird's wingspan. But this is an enduro/dual-sport motorcycle we are talking about. What is needed is better heat rejection. At least the engine used in so many of these China bikes need better cooling. Remember it was designed for third world cheap motorized transportation, not for high performance. And it is really nothing more than a 125cc engine streched every which way to get 229cc out of it. Using as much as possible the original casting dies. Air-cooled engine are not totally air cooled, and never were. They are about 50% oil cooled. This engine oil capacity is the same as when it was a 125, but now makes almost double the torque and more than double the hosepower. A small oil cooler, run inline from the strainer housing to the rocker gear in the head will reduce heat, and reduce heat where it does the most good. The barrel finning is inadequete for dealing with a lot more power, but the oil cooling helps this as well. So does using fully synthetic oil - it stands heat better. Synthetic oil also is less affected by the slicing and dicing of the oil going on in the primary drive and the transmission. The head finning and its layout is inadequete also, but the oil cooler works on that problem. If there was a big bore cylinder kit with more finning on the barrel, we'd be in hog heaven, but I've never seen one. So, to summarize, a higher performance Hawk type engine would require new cylinder and head castings with more and better laid out finning, and the next step would be dry sump lubrication, which, even with 2 1/4 quarts of lube oil, cools the oil much better....ARH |
