Mammoth
Member
In 2013 I purchased all the parts to build a GX390, and they've been sitting in a box ever since. Im working on four other projects at the moment, but I really would like to get this together so I'm trying to fit it in.
Here is most of the parts for this build.
Got the rod, piston and camshaft from Mike Clements. His parts are real nice. The connecting rod is longer than stock which is something I always try to achieve because it reduces stress.
I've had it explained to me how it reduces stress a couple times, but it sounded real technical. something about rod angles, anyway I just use the rule the longer the rod the better, and I stick to that.
To reduce drag on the internals I filed on the dipper to the shape of streemline tubing.
Crankshafts do not need shovels full of oil dumped on them to work. This only makes drag which slows the engine down considerably. Just a mist of oil is perfectly fine.
Here is the dipper before and after filing.
Here is the shape of the streamline tubing I copied. This tubing has 90% less wind drag than round tubing.
In past expirences the more I've filed off dippers the faster engines run until the dippers get so thin you would think they might break off.
Here is most of the parts for this build.
Got the rod, piston and camshaft from Mike Clements. His parts are real nice. The connecting rod is longer than stock which is something I always try to achieve because it reduces stress.
I've had it explained to me how it reduces stress a couple times, but it sounded real technical. something about rod angles, anyway I just use the rule the longer the rod the better, and I stick to that.
To reduce drag on the internals I filed on the dipper to the shape of streemline tubing.
Crankshafts do not need shovels full of oil dumped on them to work. This only makes drag which slows the engine down considerably. Just a mist of oil is perfectly fine.
Here is the dipper before and after filing.
Here is the shape of the streamline tubing I copied. This tubing has 90% less wind drag than round tubing.
In past expirences the more I've filed off dippers the faster engines run until the dippers get so thin you would think they might break off.