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Your Own Design / Re: Building a twin cylinder inline i.c. engine
« Last post by Jasonb on Today at 07:33:56 AM »The shims are in this engine as Brian had the piston hitting the valves. Which also indicates that he has not directlys called other parts as they did not hit on Malcom's design
I'd also be interested to see if the engine runs with all that starting arrangement taken off, must add some drag which won't be helping a weak engine to run. Also hope the crank is straight as that flywheel wobbles about a lot when watching the valves in slow motion.
As the one who suggested the bump test my only worry is that Brian's engines are often tight and need motoring to wear them in, so care should be taken to make sure it is compression that is being felt not tight spots. Crank looked tight when Brian posted a video of it being turned by hand, it should be free like this Brian, this is my opposed twin version
Also check that it is not over filled with oil, those of us that made opposed versions found oil got thrown up and made it's way into the cylinder on one side. It should be less likely on this engine but as sump has been changed and possibly crank and big ends more oil may be getting thrown about than is good for it.
I'd also be interested to see if the engine runs with all that starting arrangement taken off, must add some drag which won't be helping a weak engine to run. Also hope the crank is straight as that flywheel wobbles about a lot when watching the valves in slow motion.
As the one who suggested the bump test my only worry is that Brian's engines are often tight and need motoring to wear them in, so care should be taken to make sure it is compression that is being felt not tight spots. Crank looked tight when Brian posted a video of it being turned by hand, it should be free like this Brian, this is my opposed twin version
Also check that it is not over filled with oil, those of us that made opposed versions found oil got thrown up and made it's way into the cylinder on one side. It should be less likely on this engine but as sump has been changed and possibly crank and big ends more oil may be getting thrown about than is good for it.