Romoving the cooling shrowd and no fan cooling?

[chevy43]

I was looking at my Hatz 2cyl and noticed that if I run it cross ways the cooling air out of the engine will be facing forward! That's no good!

What if I let it cool like any other motorcycle with by removing all the shrowds??? Would it cool well enough? My guess is yes but has anyone else done that?

[sbrumby]

My ruggerini 950 twin blows the wrong way & never gets too hot, even at 70mph towing a trailer for hours on end doesnt bother it.

[chevy43]

sbrumy, do you have a picture of your bike you could post or send? Did you use any kind of wind block in front of the cylinders?

I have noticed that some of these engines, like the Lombardini and the Acme Motori, are almost identical to the HATZ. I wonder if your Rugerini is similar too....

[sbrumby]

No special plate, did think about about it in the build, but its not necesary. If you think about the engine in a stationary situation it works at full power with no cooling air apart from what the fan can suck. So in a bike traveling at 70mph its getting plenty.

[Dan J]

That's a great looking bike Sam

[tappy]

The ruggerini & hatz engines gives specs for the volume of air required for combustion, and for cooling.
A few calculations suggested that at 60mph, you only need an area of about 8" by 3" to provide the cooling airflow, so I figure that the engine will run fine without fan or shrouds in a british climate, given that the mean power output will rise with road speed, and the heat loss needed will follow power output roughly.
It's what I'm planning on anyway, so if it all goes Pete Tong I'll let ya know.