Rhonda(at)bpaengines.com
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 Posted: Wed Nov 03, 2010 6:09 am Post subject: Barrett M14P/PF Overhaul Specifications and Mods |
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Listers:
I have recently received some requests for information regarding our M14P modifications. We have been in development of our M14P overhaul process for the last several years. It has been quite an interesting project, and we have been delivering engines for the last 2 years. Our concept was to develop a very high standard of overhaul, such as we offer for horizontally opposed engines. We currently offer complete overhaul capability and prop strike inspections. To my knowledge, we have the only test cell in North America that can operate the engine to full power and measure its power output and fuel consumption. Measured thrust tests with our M14-P engines indicate that a -P engine, modified as described below, produces more thrust that the -PF model and does it on less fuel. The highest time modified M14-P engine we have in service has 400 hours and is used in airshows.
The major modifications to the engine include the following:
- Newly designed, three ring, forged piston available in both standard and slightly higher compression. We have had this piston/ring package for two years, and Motorstar’s ring package appears remarkably similar. The alloy used in our forging has a lower thermal coefficient of expansion and therefore can be operated at reduced clearances which increases piston ring service life, reduces blow by and oil consumption. Customers have reported a reduction in oil consumption from over a quart/hour down to a quart in 8-10 hours, with the oil staying clean through the whole oil change interval. We are not currently offering high compression options for PF owners, because we want to be able to obtain test data in our newly constructed test cell.
- Single port fuel injection through Airflow Performance. We have dialed this system in and are getting good results with it. There are some airframe mods which are the responsibility of the owner/operator but they are easily accomplished, and we can provide some technical support.
- A special micro-finish of the nose case gears to aide in keeping oil temps down, especially important as we start to raise compression in the engine. This process is extremely effective and has been taken from NASCAR, as those folks have tremendous gearbox oil temperature issues.
We have also developed repair procedures to return impossible to get parts to serviceable status. These include master rod bearings, nose case sleeve, link rod pins, and a nickel-sil reconditioning of cylinder barrels which are worn to maximum limits. The nickel-sil barrels are currently being tested. Additionally, there are a number of parts which we are seeking to manufacture which are difficult/impossible to obtain via standard resources.
One of the exciting projects on the horizon is electronic ignition. We currently have three prototypes built and are preparing for testing in our test cell. We had hoped that the system would be available by late fall, but it appears that we are probably one year away from delivery. I do not have any anticipated costs for the new system at this time.
If you would like any additional information regarding this program, please feel free to direct questions to Monty (monty(at)bpaengines.com (monty(at)bpaengines.com)), Allen (bpa(at)bpaengines.com (bpa(at)bpaengines.com)) or myself (Rhonda(at)bpaengines.com (Rhonda(at)bpaengines.com)).
Rhonda Barrett-Bewley
Barrett Precision Engines, Inc.
Tulsa, OK
(918) 835-1089 phone
(918) 835-1754 fax
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