Original Posted By: "Chris"
Thanks to those who commented on why my engine may want continuous carb heat. Indeed I thought about restriction through the air filter=2C and I may try pulling it off for a trial run. It's a conventional flat Air-Maze such as is used on billions of other engines like this. I clean it periodically and then spray on some K&N filter oil=2C and maybe that's the problem.I also thought about why it may be running lean and one of the obvious possibilities is an air leak either at the carb base gasket or on one of the many intake spider clamps and fittings. I may need to check all of those out=2C too.Without carb heat on takeoff=2C the engine will stumble when power is applied=2C and if carb heat is not pulled immediately=2C the engine will die. This is not good.Oscar ZunigaMedford=2C ORAir Camper NX41CC "Scout"A75 power ________________________________________________________________________________
Pietenpol-List: running lean
RE: Pietenpol-List: running lean
Original Posted By: owner-pietenpol-list-server(at)matronics.com
As Shad says, my bet would be an induction leak. I had such a leak when Ibuilt my A65, and it caused rough running and backfiring at idle. Check allthose hose clamps and make sure all the rubber boots are on cleanly.As for the crankshaft seal, this is an easy task if you have a tapered shaftengine. More difficult with a flanged shaft.Good Luck!Jack PhillipsNX899JPSmith Mountain Lake, Virginia _____
As Shad says, my bet would be an induction leak. I had such a leak when Ibuilt my A65, and it caused rough running and backfiring at idle. Check allthose hose clamps and make sure all the rubber boots are on cleanly.As for the crankshaft seal, this is an easy task if you have a tapered shaftengine. More difficult with a flanged shaft.Good Luck!Jack PhillipsNX899JPSmith Mountain Lake, Virginia _____
Re: Pietenpol-List: running lean
Original Posted By: Jack Phillips
Run the engine at idle and spray intake joints with starting fluid and if it picks up rpms you have a leak.-----Original Message-----
Run the engine at idle and spray intake joints with starting fluid and if it picks up rpms you have a leak.-----Original Message-----
Pietenpol-List: Re: running lean
Original Posted By: "William Wynne"
The seal on my engine is essentially new, and has seeped oil since new becausethe crank surface was not prepared properly. I know what needs to be done andwill do it, and I'm sure it will be quick and painless. Here's what my A&P toldme is the way he does it:"If you have a microwave at the hangar, I pull the spring out of the seal and hookthe spring back together behind the flange. Then I submerge the seal in acup of water and microwave for 30 second intervals until it is steaming. Thenjust stretch it over the flange and let it shrink back up. While it's shrinking,work the spring into place in the back of the seal. Give it a coat of PermatexUltra around the outside and in the seal cavity, and slide it into place.Make sure it's fully seated so the seal sits even on the crank and let itcure overnight."--------Oscar ZunigaMedford, ORAir Camper NX41CC "Scout"A75 powerRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: running lean
The seal on my engine is essentially new, and has seeped oil since new becausethe crank surface was not prepared properly. I know what needs to be done andwill do it, and I'm sure it will be quick and painless. Here's what my A&P toldme is the way he does it:"If you have a microwave at the hangar, I pull the spring out of the seal and hookthe spring back together behind the flange. Then I submerge the seal in acup of water and microwave for 30 second intervals until it is steaming. Thenjust stretch it over the flange and let it shrink back up. While it's shrinking,work the spring into place in the back of the seal. Give it a coat of PermatexUltra around the outside and in the seal cavity, and slide it into place.Make sure it's fully seated so the seal sits even on the crank and let itcure overnight."--------Oscar ZunigaMedford, ORAir Camper NX41CC "Scout"A75 powerRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: running lean
Pietenpol-List: Re: running lean
Original Posted By: "taildrags"
Oscar,An induction leak, like a hose, will mess up the idle, but it will have littleor no effect on running the engine near it's full static rpm. If you engine needscarb heat to run at static rpm, something else is wrong.Plane sat for 18 Months? What kind of gas/was is in it? Ethanol or not, car gaswith 1.5 birthdays is bad. If it was left in the carb, it possibly made thingsunhappy.Dirty idle circuit; again affects at low speed, but not near static rpm.You mention mag drop at idle? Traditionally, I use 1700 rpm to test the drop ona small Continental. Is it within limits at that rpm?Back to basics: It is likely the last thing you touched, and not very likely tobe something like the leaning function in the Stromberg suddenly deciding thatthis was the moment to go out of wack. Mags off: Does the engine have normal compression on all cylinders? Do you haveimpulse on both mags? Are they 'clicking' at the same time? Pop the fuel lineoff right at the carb and make sure you can fill a 1 quart container in 65-75seconds or less.Not likely to be the air box itself. I have seen engines run perfectly fine withairboxes that had the shaft holes walled out to 1/2". K&N filter oil is greatfor......K&N filters. not all elements like it. Spray it on some Bracket filtersand you might as well have sprayed it with clear paint. -ww.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: running lean
Oscar,An induction leak, like a hose, will mess up the idle, but it will have littleor no effect on running the engine near it's full static rpm. If you engine needscarb heat to run at static rpm, something else is wrong.Plane sat for 18 Months? What kind of gas/was is in it? Ethanol or not, car gaswith 1.5 birthdays is bad. If it was left in the carb, it possibly made thingsunhappy.Dirty idle circuit; again affects at low speed, but not near static rpm.You mention mag drop at idle? Traditionally, I use 1700 rpm to test the drop ona small Continental. Is it within limits at that rpm?Back to basics: It is likely the last thing you touched, and not very likely tobe something like the leaning function in the Stromberg suddenly deciding thatthis was the moment to go out of wack. Mags off: Does the engine have normal compression on all cylinders? Do you haveimpulse on both mags? Are they 'clicking' at the same time? Pop the fuel lineoff right at the carb and make sure you can fill a 1 quart container in 65-75seconds or less.Not likely to be the air box itself. I have seen engines run perfectly fine withairboxes that had the shaft holes walled out to 1/2". K&N filter oil is greatfor......K&N filters. not all elements like it. Spray it on some Bracket filtersand you might as well have sprayed it with clear paint. -ww.Read this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: running lean
Pietenpol-List: Re: running lean
Original Posted By: "taildrags"
Its been my experience the victor would get my recommendation. Accessories, tipsetc. are readily available. Please stay away from the Asian crap. Harborfreight is good for many tools(including mig welders) but I've tried using theirtorches owned by a friend and they're trash. GlenSent from my iPhone> On Mar 22, 2014, at 3:10 PM, "jarheadpilot82" wrote:> > > I think that my biggest concern at this point is the torch itself. So, what branddo you recommend?> > Buehler? Buehler? Anyone? Anyone?> > --------> Semper Fi,> > Terry Hand> Athens, GA> > USMC, USMCR, ATP> BVD DVD PDQ BBQ> > > > > Read this topic online here:> > http://forums.matronics.com/viewtopic.p ... 865#420865> > > > > > > > > > ________________________________________________________________________________Subject: Pietenpol-List: Re: running lean
Its been my experience the victor would get my recommendation. Accessories, tipsetc. are readily available. Please stay away from the Asian crap. Harborfreight is good for many tools(including mig welders) but I've tried using theirtorches owned by a friend and they're trash. GlenSent from my iPhone> On Mar 22, 2014, at 3:10 PM, "jarheadpilot82" wrote:> > > I think that my biggest concern at this point is the torch itself. So, what branddo you recommend?> > Buehler? Buehler? Anyone? Anyone?> > --------> Semper Fi,> > Terry Hand> Athens, GA> > USMC, USMCR, ATP> BVD DVD PDQ BBQ> > > > > Read this topic online here:> > http://forums.matronics.com/viewtopic.p ... 865#420865> > > > > > > > > > ________________________________________________________________________________Subject: Pietenpol-List: Re: running lean