We have just finished doing a few tests runs on the dyno. Today we were testing the following:-
running with no air filter or cover.
running with a gx160 debaffled exhaust
running with a gx200 debaffled exhaust
We still have to process the images but below is a brief overview of the results.
When run without the airfilter and air filter cover the engine produced slightly less hp than when the airfilter and cover was fitted.
The gx200 debaffled exhaust produced approximately 0.2hp more than the gx160 debaffled exhaust.
We initially ran the gx160 debaffled exhaust without an exhaust shroud. This turned out to be approximately 0.3hp worse than the standard exhaust (with shroud). We then fitted the shroud and found the debaffled exhaust to be 0.4hp better than the standard exhaust. We concluded that the holes where the exhaust screws fit must have been reducing back pressure and loosing performance. It is therefore worth checking your exhausts and if the exhaust screws work loose, replacing these as soon as possible as a power loss is the result. It may only be small but every 0.1hp counts.
We are still running on the gravity fed fuel tank. The next dyno tests will be with the pulse pump system fitted. This will be the engine in full MSA spec.
More details and graphs will be posted in the next day or so.
