lml@lancaironline.net Mailing List Archive

<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> In reference to the Lycoming engine, I've found that putting in high compression pistons will lower your TBO time. It makes the engine produce more heat and takes the norm imbalance of the cylinders and makes them worse. If you are looking for higher HP from your cylinders and make them run smoother, you need to match flow them on a flow bench. For ex - 360 Lycoming engine that should produce 180HP you put all 4 cylinders on a bench and float them you'll will get about 160-165. When you open them up and bring them to specks you should be able to get 180HP. If your looking for more, open the port to 1% and the exhaust to 3%, the highest capable of those cylinders thus far has been 204 HP on a straight valve Lycoming engine. If you were to take IO-360 200HP angle valve, that has Venture Valve Guides, these can be opened up to approx. 220-230HP. The reason the variance of what the HP is, is the fact that you have to flow it to the lowest cylinder to make all cylinders equal. One of the ES's that I recently completed was at Oshkosh last year on display at the Lancair tent. That aircraft had a used 520 engine rated at 285 HP. I ceramic coated the intake and exhaust and installed an electronic ignition and it ran super cool and burned a mere 12.5 GPH at 8,000 ft. And with a used 520 engine, we were getting a bit better than the published numbers that Lancair states. I probably could have leaned it back even more so since it was running so cool but we figured gas was less $ than a new engine! >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>