Percy. The cheapest way to get more take off power is to have the prop repitched to a climb pitch. Depending on propeller and prop-shop, you are looking at $50 to a few hundreds.
Second option is the conversion to a 85 hp engine. Here you might have to change the trim tab installation on some Ercoupes. That sets you back a few hundreds, then some prop/ C-85 combinations require to add the cooling baffles around the oil kidney, the set is around $ 750 I believe. With that price by the way, not many C-85 owners in a Coupe care for these extra baffles. Some invented their own version, only one 337 that I know of here. Plus the carburetor ventury change for around 100 bucks the ventury and around fifty for the bigger jet: http://univairparts.com/shopping_291765/advanced_search_result.php?search_in_description=1&keywords=stromberg&categories_id=&osCsid=3db2f9ef831294f87e16cc1fca2e958d&inc_subcat=1 And of course you need to trim down your propeller in size, and have it repitched, but I understand that had been done so before. >From my point of view, I see the horse power win in a C-85 to be marginal. The >bigger ventury allows the engine to run faster. Then , and only then the 10 >extra horse are developed, running slower, the engine is having a similar >power curve as the C-75. The perceived power gain is that the C-85 with a >shorter prop acts in a way like a flatter pitched C-75 prop. So, either way, you will need a flat pitched prop for more ummph. The most expensive option would be to install an aeromatic propeller. That would give you a good climb and a satisfying cruise. That route sets you back close to 5k Dollars I believe. Hartmut ----- Original Message ----- From: Percy To: [email protected] Sent: Monday, July 28, 2008 5:21 AM Subject: [ercoupe-tech] Re(visited): 75 to 85 costs Lots of good info, Sports Fans, but not `zac'ly what I needed. I'm interested in the costs for getting more take off ooompf. Options: * RATO (they did that in 1941) * Upgrage to the 85 HP motor per Continental publication. * Repitch prop (it is 7150). HOW is not as important as How Much. Percy in (high, hot) NM, USA
