Debra
01-04-2007, 12:40 PM
Mr Lee,
I think I may have an eh oh. In your reply to Jeane Lillis in February issue you gave a suggestion on the crankcase vent used by Saito engines. I also have the same problem as mentioned by Jeane, that is my Saito 56 was making a mess out of the engine cowl. To fix, I drilled and taped a hole for a muffler fitting to the end of the muffler (after the baffle) and connected a section of fuel line between the crankcase fitting and added fitting on muffler end. My thinking for this change was the venturi action of the exhaust pass the fitting would draw out the oil, but I didn't realize the vent fitting on engine was venting the engine crankcase with movement of the piston The engine has approximatly four hours operating time with this configuration. I have not noticed any change in operation or performance, is this a no no? By the way I add 3 oz of Castor to a gallon of fuel. Perhaps I also made some other changes to my procedures, but with the added oil I have not had any more unexplained engine shutdowns in the air with my four strokes.
A second question: The container for Morgan Fuel (Cool Power) says to not use After Run oil. Do you agree with this and is there any harm in continuing to use After Run oil with Morgan Fuel?
Best regards,
Fred L.
Dear Fred,
It doesn't matter where you tap into the muffler, i.e., ahead of or behind the baffle, you are still going to have positive pressure. This means that even more combustion bypass products are being forced back into the engine than those that normally leak past the piston. You are also creating a positive pressure in the crankcase that the piston has to work against on the down stroke. You would be better off tapping the intake pipe as does O.S. on some of their engines.
I have a couple of gallons of Morgan's Omega fuel on hand that I've had for a while, but they do not say anything about not to use after run oil. Are you sure it says not to use or not needed?? Several of the fuel manufacturers say after run oil is not needed due to feeling that their oil package is so superior it is not required I do not agree. Unfortunately, when you use methanol, which is hygroscopic, i.e., attracts water, and nitromethane, whose by-product of combustion is formic and nitric acid, you are going to get rust. I have used Morgan fuel for years and the oil they use is probably one of the best when it comes to rust formation, but even so, if raw fuel is left in the engine, you are going to get rust and corrosion. You are not going to hurt anything by using after run oil with Morgan fuel and will extend the life of the bearings, etc., by doing so.
Yours,
Clarence Lee
(to write to Clarence, email man@airage.com)
I think I may have an eh oh. In your reply to Jeane Lillis in February issue you gave a suggestion on the crankcase vent used by Saito engines. I also have the same problem as mentioned by Jeane, that is my Saito 56 was making a mess out of the engine cowl. To fix, I drilled and taped a hole for a muffler fitting to the end of the muffler (after the baffle) and connected a section of fuel line between the crankcase fitting and added fitting on muffler end. My thinking for this change was the venturi action of the exhaust pass the fitting would draw out the oil, but I didn't realize the vent fitting on engine was venting the engine crankcase with movement of the piston The engine has approximatly four hours operating time with this configuration. I have not noticed any change in operation or performance, is this a no no? By the way I add 3 oz of Castor to a gallon of fuel. Perhaps I also made some other changes to my procedures, but with the added oil I have not had any more unexplained engine shutdowns in the air with my four strokes.
A second question: The container for Morgan Fuel (Cool Power) says to not use After Run oil. Do you agree with this and is there any harm in continuing to use After Run oil with Morgan Fuel?
Best regards,
Fred L.
Dear Fred,
It doesn't matter where you tap into the muffler, i.e., ahead of or behind the baffle, you are still going to have positive pressure. This means that even more combustion bypass products are being forced back into the engine than those that normally leak past the piston. You are also creating a positive pressure in the crankcase that the piston has to work against on the down stroke. You would be better off tapping the intake pipe as does O.S. on some of their engines.
I have a couple of gallons of Morgan's Omega fuel on hand that I've had for a while, but they do not say anything about not to use after run oil. Are you sure it says not to use or not needed?? Several of the fuel manufacturers say after run oil is not needed due to feeling that their oil package is so superior it is not required I do not agree. Unfortunately, when you use methanol, which is hygroscopic, i.e., attracts water, and nitromethane, whose by-product of combustion is formic and nitric acid, you are going to get rust. I have used Morgan fuel for years and the oil they use is probably one of the best when it comes to rust formation, but even so, if raw fuel is left in the engine, you are going to get rust and corrosion. You are not going to hurt anything by using after run oil with Morgan fuel and will extend the life of the bearings, etc., by doing so.
Yours,
Clarence Lee
(to write to Clarence, email man@airage.com)