frog Posted January 28, 2013 Report Share Posted January 28, 2013 I have a 465 cub on gas(c-12) and I want to build a 688 dm to run on c-16. The only reason is because one of my friends will be riding a 4 mil DM cylinder (555) and says he is going to beat me. We all trail ride, hill climb and drag race. I know 18 mil is a little out there but if I’m building a DM cylinder bike there is no use building the same as him. Will it overheat when dune and trail riding as I know the DM do not have as much cooling capacity as the cub cylinder. Quote Link to comment Share on other sites More sharing options...
quadpro26 Posted January 28, 2013 Report Share Posted January 28, 2013 the dm should run just as cool as the cub when jetted correctly. if your worried about it put it on alky. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted January 28, 2013 Report Share Posted January 28, 2013 Both our 18DMs get hot after 3-4 passes in the dunes. Even jetted correctly on gas they warm up fast. The 18s on alky I've been around definitely stay cooler longer but eventually get hot enough that they need cooled down. Quote Link to comment Share on other sites More sharing options...
frog Posted January 28, 2013 Author Report Share Posted January 28, 2013 I know 18 mil is big but if I'm going to build a new engine I want it to be my last .And when I say trail riding it's driving down mine haul roads(almost like dune sand) a little harder.I always wanted to build a DM cylinder bike but if it won't cool down when riding dunes there is no use building. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted January 29, 2013 Report Share Posted January 29, 2013 Amazing how much of this DM stuff has been floating around lately Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted January 29, 2013 Report Share Posted January 29, 2013 Any of your guys that want to hot-lap your bikes ever thought about a water to water cooling setup? Get a small aluminum tank of some sort and put a small radiator inside the tank, plumb your coolant lines through the wall of the aluminum tank and into the radiator. Fill the aluminum tank with ice before you head out to race. It will take quite a bit to heat the entire system up. We use the same sort of setup to pre-cool the fuel going into the big sled pulling engines. -Jared Quote Link to comment Share on other sites More sharing options...
frog Posted January 29, 2013 Author Report Share Posted January 29, 2013 So if my friend with the 555 DM motor and I go riding. All I have to do is cruise around for 15 or 20 minutes and drag him and he will overheat. That's going to be shitty for him. I think I'll let him know about the problem he is going to have. Thanks for the heads up before I spent all that money on my new motor.. Quote Link to comment Share on other sites More sharing options...
frog Posted February 8, 2013 Author Report Share Posted February 8, 2013 How is the 72mm super cub for cooling. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted February 8, 2013 Report Share Posted February 8, 2013 Stellar! Ever watch Pikes Peak racing? Wide Fucking open! And up hill to boot. Those motors stay very well loaded for quite a duration. Quote Link to comment Share on other sites More sharing options...
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