If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
Venting of Lycoming 0-290 D Engine
On Apr 28, 5:36*pm, "Morgans" wrote:
"stol" wrote in message ... I wonder what the answer is, and why that solution would be a problem. I'm sure it has been tried, since it seems there is truly nothing new under the sun, when it comes to airplanes. -- Jim in NC *You have hurt my feelings again....... :(( Whoops! Sorry. That should have read "nothing new under the sun, when it comes to the _old_ designed air cooled opposed aircraft engines. Or something like that! ;-) Speaking of auto engine aircraft, how do you handle the crankcase ventilation issue? *Vent overboard, or recirculate? -- Jim in NC I have tried three ways. The first was to recirculate using a PCV valve. At the time it seems to be the most logical. The motor was still fresh and has a slight amount of blowby. That system made it real twitchy to try to lean, but is was doable. my second concept was the racing vacuum system used in dragsters, That did work great but I am now on my third design of the exhaust pipes. those don't have the fittings welded in them for the vacuum so I dump the stuff overboard, what little blowby there is. This is like developing software. Version 1.0,,, 1.2,,,, 2.0,,, 2.3... Yada Yada yada... On the final engines that will go out the door they will incorporate the Moroso vacuum system. Hands down,, the more power you make the greater the suction. Just what a aircraft engine needs. |
#12
|
|||
|
|||
Venting of Lycoming 0-290 D Engine
In article
, stol wrote: On Apr 28, 5:36*pm, "Morgans" wrote: "stol" wrote in message ... I wonder what the answer is, and why that solution would be a problem. I'm sure it has been tried, since it seems there is truly nothing new under the sun, when it comes to airplanes. -- Jim in NC *You have hurt my feelings again....... :(( Whoops! Sorry. That should have read "nothing new under the sun, when it comes to the _old_ designed air cooled opposed aircraft engines. Or something like that! ;-) Speaking of auto engine aircraft, how do you handle the crankcase ventilation issue? *Vent overboard, or recirculate? -- Jim in NC I have tried three ways. The first was to recirculate using a PCV valve. At the time it seems to be the most logical. The motor was still fresh and has a slight amount of blowby. That system made it real twitchy to try to lean, but is was doable. my second concept was the racing vacuum system used in dragsters, That did work great but I am now on my third design of the exhaust pipes. those don't have the fittings welded in them for the vacuum so I dump the stuff overboard, what little blowby there is. This is like developing software. Version 1.0,,, 1.2,,,, 2.0,,, 2.3... Yada Yada yada... On the final engines that will go out the door they will incorporate the Moroso vacuum system. Hands down,, the more power you make the greater the suction. Just what a aircraft engine needs. Actually, it is not a good idea to ingest crankcase fumes into the induction system, as those fumes contain acids (bromic, sulfuric acids) that corrode carburetors, valves, throttle bodies, etc. It is best just to vent the crankcase overboard, to ambient air. -- Remove _'s from email address to talk to me. |
#13
|
|||
|
|||
Venting of Lycoming 0-290 D Engine
On Apr 28, 9:00*pm, Orval Fairbairn
wrote: In article , *stol wrote: On Apr 28, 5:36*pm, "Morgans" wrote: "stol" wrote in message .... I wonder what the answer is, and why that solution would be a problem. I'm sure it has been tried, since it seems there is truly nothing new under the sun, when it comes to airplanes. -- Jim in NC *You have hurt my feelings again....... :(( Whoops! Sorry. That should have read "nothing new under the sun, when it comes to the _old_ designed air cooled opposed aircraft engines. Or something like that! ;-) Speaking of auto engine aircraft, how do you handle the crankcase ventilation issue? *Vent overboard, or recirculate? -- Jim in NC I have tried *three ways. The first was to recirculate using a PCV valve. At the time it seems to be the most logical. The motor was still fresh and has a slight amount of blowby. That system made it real twitchy to try to lean, but is was doable. my second concept was the racing vacuum system used in dragsters, That did work great but I am now on my third design of the exhaust pipes. those don't have the fittings welded in them for the vacuum so I dump the stuff overboard, what little blowby there is. This is like developing software. Version 1.0,,, 1.2,,,, 2.0,,, 2.3... Yada Yada yada... On the final engines that will go out the door they will incorporate the Moroso vacuum system. Hands down,, the more power you make the greater the suction. Just what a aircraft engine needs. Actually, it is not a good idea to ingest crankcase fumes into the induction system, as those fumes contain acids (bromic, sulfuric acids) that corrode carburetors, valves, throttle bodies, etc. It is best just to vent the crankcase overboard, to ambient air. -- Remove _'s *from email address to talk to me.- Hide quoted text - - Show quoted text - Interesting,, I will call Detroit this morning to warn them that the PCV valve, in operation since the late 60's is clearly defective.... :). Ben |
#14
|
|||
|
|||
Venting of Lycoming 0-290 D Engine
In article
, stol wrote: On Apr 28, 9:00*pm, Orval Fairbairn wrote: In article , *stol wrote: On Apr 28, 5:36*pm, "Morgans" wrote: "stol" wrote in message ... I wonder what the answer is, and why that solution would be a problem. I'm sure it has been tried, since it seems there is truly nothing new under the sun, when it comes to airplanes. -- Jim in NC *You have hurt my feelings again....... :(( Whoops! Sorry. That should have read "nothing new under the sun, when it comes to the _old_ designed air cooled opposed aircraft engines. Or something like that! ;-) Speaking of auto engine aircraft, how do you handle the crankcase ventilation issue? *Vent overboard, or recirculate? -- Jim in NC I have tried *three ways. The first was to recirculate using a PCV valve. At the time it seems to be the most logical. The motor was still fresh and has a slight amount of blowby. That system made it real twitchy to try to lean, but is was doable. my second concept was the racing vacuum system used in dragsters, That did work great but I am now on my third design of the exhaust pipes. those don't have the fittings welded in them for the vacuum so I dump the stuff overboard, what little blowby there is. This is like developing software. Version 1.0,,, 1.2,,,, 2.0,,, 2.3... Yada Yada yada... On the final engines that will go out the door they will incorporate the Moroso vacuum system. Hands down,, the more power you make the greater the suction. Just what a aircraft engine needs. Actually, it is not a good idea to ingest crankcase fumes into the induction system, as those fumes contain acids (bromic, sulfuric acids) that corrode carburetors, valves, throttle bodies, etc. It is best just to vent the crankcase overboard, to ambient air. -- Remove _'s *from email address to talk to me.- Hide quoted text - - Show quoted text - Interesting,, I will call Detroit this morning to warn them that the PCV valve, in operation since the late 60's is clearly defective.... The PCV valve was government mandated for pollution control only! It makes no difference to the gov't if it harms your engine components, as long as it meets THEIR requirements. It would be stupid to install one on an aircraft. -- Remove _'s from email address to talk to me. |
#15
|
|||
|
|||
Venting of Lycoming 0-290 D Engine
On Apr 29, 8:58*am, Orval Fairbairn
wrote: In article , *stol wrote: On Apr 28, 9:00*pm, Orval Fairbairn wrote: In article , *stol wrote: On Apr 28, 5:36*pm, "Morgans" wrote: "stol" wrote in message ... I wonder what the answer is, and why that solution would be a problem. I'm sure it has been tried, since it seems there is truly nothing new under the sun, when it comes to airplanes. -- Jim in NC *You have hurt my feelings again....... :(( Whoops! Sorry. That should have read "nothing new under the sun, when it comes to the _old_ designed air cooled opposed aircraft engines. Or something like that! ;-) Speaking of auto engine aircraft, how do you handle the crankcase ventilation issue? *Vent overboard, or recirculate? -- Jim in NC I have tried *three ways. The first was to recirculate using a PCV valve. At the time it seems to be the most logical. The motor was still fresh and has a slight amount of blowby. That system made it real twitchy to try to lean, but is was doable. my second concept was the racing vacuum system used in dragsters, That did work great but I am now on my third design of the exhaust pipes. those don't have the fittings welded in them for the vacuum so I dump the stuff overboard, what little blowby there is. This is like developing software. Version 1.0,,, 1.2,,,, 2.0,,, 2.3... Yada Yada yada... On the final engines that will go out the door they will incorporate the Moroso vacuum system. Hands down,, the more power you make the greater the suction. Just what a aircraft engine needs. Actually, it is not a good idea to ingest crankcase fumes into the induction system, as those fumes contain acids (bromic, sulfuric acids) that corrode carburetors, valves, throttle bodies, etc. It is best just to vent the crankcase overboard, to ambient air. -- Remove _'s *from email address to talk to me.- Hide quoted text - - Show quoted text - Interesting,, I will call Detroit this morning to warn them that the PCV valve, in operation since the late 60's is clearly defective.... The PCV valve was government mandated for pollution control only! It makes no difference to the gov't if it harms your engine components, as long as it meets THEIR requirements. It would be stupid to install one on an aircraft. -- Remove _'s *from email address to talk to me.- Hide quoted text - - Show quoted text - I don't want to get in a ****ing match with you. I am headed out to fly my plane and I don't have time to waste. I can say I have been working on engines most of my 53 years and I cannot say that even once did I see corrosion, pitting, wear, etc or premature failure of any component that the PVC valve related (bromic, sulfuric acid) theory created.. In fact you don't have a clue on how a modern day engine is plumbed. A PVC system dumps the (bromic, sulfuric acids), if they really exist in any viable concentratiohat into the intake manifold DOWNSTREAM of the carb or throttle body so your concept is BS. I respect you as a fellow pilot, a person who has chosen to live in an airpark, which in itself is a statement to you have a large commitment to aviation and a fellow experimental aircraft owner. I would bet if a lycoming had a PCV valve you would praising its function... Just my opinion... Tailwinds... Ben N801BH EAA lifetime member. |
#16
|
|||
|
|||
Venting of Lycoming 0-290 D Engine
"Orval Fairbairn" wrote The PCV valve was government mandated for pollution control only! It makes no difference to the gov't if it harms your engine components, as long as it meets THEIR requirements. It would be stupid to install one on an aircraft. While I believe your stand has merit, I think the truth is somewhere in the middle. While some harm may be done, it is very little. Otherwise, I don't think I would have gotten two of my last Detroit engines and induction systems to over 200,000 miles. Added to that, the fact that these engines had _no_ problem with their induction systems, at those miles. -- Jim in NC |
#17
|
|||
|
|||
Venting of Lycoming 0-290 D Engine
"stol" wrote my second concept was the racing vacuum system used in dragsters, That did work great but I am now on my third design of the exhaust pipes. What do dragsters and such use in their pipes for vacuum? Some type of venture, or something? -- Jim in NC |
#18
|
|||
|
|||
Venting of Lycoming 0-290 D Engine
On Apr 29, 5:53 pm, "Morgans" wrote:
"Orval Fairbairn" wrote The PCV valve was government mandated for pollution control only! It makes no difference to the gov't if it harms your engine components, as long as it meets THEIR requirements. It would be stupid to install one on an aircraft. While I believe your stand has merit, I think the truth is somewhere in the middle. While some harm may be done, it is very little. Otherwise, I don't think I would have gotten two of my last Detroit engines and induction systems to over 200,000 miles. Added to that, the fact that these engines had _no_ problem with their induction systems, at those miles. -- Jim in NC Acids are formed in the crankcase, but mostly as a result of condensation mixing with the oil and allowed to sit for some time. Water breaks down and combines with elements in the oil to form those acids, with the dissimilar metals acting as catalysts. The acids eat bearings and cams and cylinders and pistons and such stuff. The PCV system is better than a straight vent, where it can be made to work. The intake manifold draws the blowby gases out of the crankcase, those gases including water vapor, unburned hydrocarbons and combustion byproducts. The volume of gases drawn out is larger than the blowby gases, so filtered air is let into the case at some other point. This purging keeps the case cleaner than with just an overboard vent. The PCV gases are reburned and blown out with the exhaust. They do much less damage that way, both to the engine and the environment. Dan |
#19
|
|||
|
|||
Venting of Lycoming 0-290 D Engine
On Apr 29, 5:56*pm, "Morgans" wrote:
"stol" wrote *my second concept was the racing vacuum system used in dragsters, That did work great but I am now on my third design of the exhaust pipes. What do dragsters and such use in their pipes for vacuum? *Some type of venture, or something? -- Jim in NC Jim, It is a rather easy device. It acts just like those air nozzles with a small hose attached at an angle that one can use to spray solvent on a part to clean it. As the air passes across the side opening it creates a vacuum. Here is a link to Moroso's kit. The kit comes with two 3/8" pipes about 3" long, you weld on a bung at about a 45 degree angle to the tailpipe and screw in the pipe. The kit has a check valve to prevent backfires from entering the valve covers. On my application I made my own set up, ( imagine that)... I used just one on the right tailpipe and I had way too much suction so I had to restrict it. Kinda like the old joke " she could suck a golf ball through a garden hose".. This was when my motor had 10 hours on it or so and the rings had not completely seated. I took that version off because the motor is now so sealed up I have practically no blowby and saved a couple of lbs... YMMV. http://store.summitracing.com/partde...5&autoview=sku Ben |
#20
|
|||
|
|||
Venting of Lycoming 0-290 D Engine
On Apr 29, 9:17*pm, stol wrote:
On Apr 29, 5:56*pm, "Morgans" wrote: "stol" wrote *my second concept was the racing vacuum system used in dragsters, That did work great but I am now on my third design of the exhaust pipes. What do dragsters and such use in their pipes for vacuum? *Some type of venture, or something? -- Jim in NC Jim, It is a rather easy device. It acts just like those air nozzles with a *small hose attached at an angle that one can use to spray solvent on a part to clean it. As the air passes across the side opening it creates a vacuum. Here is a link to Moroso's kit. The kit comes with two 3/8" pipes about 3" long, you weld on a bung at about a 45 degree angle to the tailpipe and screw in the pipe. The kit has a check valve to prevent backfires from entering the valve covers. On my application I made my own set up, ( imagine that)... I used just one on the right tailpipe and I had way too much suction so I had to restrict it. Kinda like the old joke " she could suck a golf ball through a garden hose".. This was when my motor had 10 hours on it or so and the rings had not completely seated. I took that version off because the motor is now so sealed up I have practically no blowby and saved a couple of lbs... *YMMV. http://store.summitracing.com/partde...=1&part=MOR%2D.... Ben Ben Never knew these existed. Have you or anyone else tried it on a Lyc? Probably need a couple of intakes on opposite valve covers? Ed |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
leaning a lycoming engine | airpix | Piloting | 0 | April 19th 06 02:02 PM |
Experimental Lycoming engine clones | Ted | Home Built | 1 | April 15th 06 09:21 PM |
Which overhauled Lycoming 0-360 A4M Engine To Fit In My Archer ? | Roy Page | Owning | 7 | February 2nd 06 02:19 AM |
Lycoming Engine Rebuild Seminar | N523RV | Home Built | 0 | August 18th 05 06:37 PM |
Just venting about my V35's annual/engine replacement | Peter R. | Owning | 11 | November 27th 04 05:40 PM |