---------------------------------------------------------- M14PEngines-List Digest Archive --- Total Messages Posted Fri 10/04/13: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:08 PM - Low RPM (john.pearson757) 2. 12:30 PM - Re: Low RPM (A. Dennis Savarese) 3. 12:41 PM - Re: Low RPM (George Coy) 4. 01:00 PM - Re: Low RPM (john.pearson757) 5. 01:19 PM - Re: Low RPM (A. Dennis Savarese) 6. 01:24 PM - Re: Low RPM (john.pearson757) 7. 01:26 PM - Re: Re: Low RPM (A. Dennis Savarese) 8. 01:37 PM - Re: Low RPM (john.pearson757) ________________________________ Message 1 _____________________________________ Time: 12:08:49 PM PST US Subject: M14PEngines-List: Low RPM From: "john.pearson757" I was getting only 90% RPM and for other reasons, changed engines on my Skybolt. I'm still getting 90% at best, more like 87 or 88%. The carb is different and is rebuilt by Jill at M-14P.com so that can't be the problem. The mag timing is spot on and checked and re-checked. The blade angle is finer that standard. All linkages and travel have been checked. The tach is accurate and actual RPM has been checked. When I reach full RPM, there is still quite a bit of throttle left so I guess I'm just pouring more fuel into the mix. If anyone has suggestions or advice, thanks. J.P. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=409860#409860 ________________________________ Message 2 _____________________________________ Time: 12:30:09 PM PST US From: "A. Dennis Savarese" Subject: Re: M14PEngines-List: Low RPM Do I understand you correctly? Same prop? Different engine? What prop is on the airplane? If an MT 3 blade prop, does the prop governor have the correct spring in it for the MT prop? Do check with MT regarding the correct spring for the prop governor. You said all linkages and travel have been checked. Have you verified the carburetor throttle arm is at WOT when the throttle cable is pushed fully forward? Do this by removing the throttle linkage from the carburetor throttle arm, move the throttle arm on the carb to WOT. Now hold the throttle linkage next to the throttle arm and then see where the linkage is positioned with the throttle fully forward. A. Dennis Savarese 334-285-6263 334-546-8182 (mobile) www.yak-52.com Skype - Yakguy1 On 10/4/2013 2:08 PM, john.pearson757 wrote: > > I was getting only 90% RPM and for other reasons, changed engines on my Skybolt. > I'm still getting 90% at best, more like 87 or 88%. > The carb is different and is rebuilt by Jill at M-14P.com so that can't be the problem. The mag timing is spot on and checked and re-checked. The blade angle is finer that standard. All linkages and travel have been checked. The tach is accurate and actual RPM has been checked. > When I reach full RPM, there is still quite a bit of throttle left so I guess I'm just pouring more fuel into the mix. > If anyone has suggestions or advice, thanks. > J.P. > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=409860#409860 > > ________________________________ Message 3 _____________________________________ Time: 12:41:46 PM PST US From: "George Coy" Subject: RE: M14PEngines-List: Low RPM Is the governor arm moving to the stop? Have you re adjusted the stop? -----Original Message----- From: owner-m14pengines-list-server@matronics.com [mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of john.pearson757 Sent: Friday, October 04, 2013 3:08 PM Subject: M14PEngines-List: Low RPM --> I was getting only 90% RPM and for other reasons, changed engines on my Skybolt. I'm still getting 90% at best, more like 87 or 88%. The carb is different and is rebuilt by Jill at M-14P.com so that can't be the problem. The mag timing is spot on and checked and re-checked. The blade angle is finer that standard. All linkages and travel have been checked. The tach is accurate and actual RPM has been checked. When I reach full RPM, there is still quite a bit of throttle left so I guess I'm just pouring more fuel into the mix. If anyone has suggestions or advice, thanks. J.P. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=409860#409860 ________________________________ Message 4 _____________________________________ Time: 01:00:16 PM PST US Subject: M14PEngines-List: Re: Low RPM From: "john.pearson757" Thanks for the reply. The prop is a 2 blade V530 - different governors. It is going to the stop. I think the throttle is OK. When I reach 87%, I can push the throttle forward quite a bit more. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=409865#409865 ________________________________ Message 5 _____________________________________ Time: 01:19:09 PM PST US From: "A. Dennis Savarese" Subject: Re: M14PEngines-List: Low RPM Was the prop governor swapped from the old engine to the new engine?- =0A Dennis=0A=0A=0A=0A=0A________________________________=0A From: George Coy < george.coy@gmail.com>=0ATo: m14pengines-list@matronics.com =0ASent: Friday, October 4, 2013 2:39 PM=0ASubject: RE: M14PEngines-List: Low RPM=0A =0A=0A =0A=0AIs the governor arm moving to the stop? Have you re adjusted the stop ?=0A=0A-----Original Message-----=0AFrom: owner-m14pengines-list-server@mat ronics.com=0A[mailto:owner-m14pengines-list-server@matronics.com] On Behalf Of=0Ajohn.pearson757=0ASent: Friday, October 04, 2013 3:08 PM=0ATo: m14pen gines-list@matronics.com=0ASubject: M14PEngines-List: Low RPM=0A=0A--> M14P Engines-List message posted by: "john.pearson757" =0A--> =0A=0AI was getting only 90% RPM and for other reasons, changed engin es on my=0ASkybolt.=0AI'm still getting 90% at best, more like 87 or 88%. =0AThe carb is different and is rebuilt by Jill at M-14P.com so that can't be=0Athe problem.- The mag timing is spot on and checked and re-checked. - The=0Ablade angle is finer that standard.- All linkages and travel ha ve been=0Achecked.- The tach is accurate and actual RPM has been checked. =0AWhen I reach full RPM, there is still quite a bit of throttle left so I =0Aguess I'm just pouring more fuel into the mix.=0AIf anyone has suggestio ns or advice, thanks.=0AJ.P.=0A=0A=0A=0A=0ARead this topic online here:=0A =0Ahttp://forums.matronics.com/viewtopic.php?p=409860#409860=0A=0A=0A=0A = ________________________________ Message 6 _____________________________________ Time: 01:24:22 PM PST US Subject: M14PEngines-List: Re: Low RPM From: "john.pearson757" No, the governor wasn't swapped - new or different governor and I've played with the stops with no result. J.P. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=409867#409867 ________________________________ Message 7 _____________________________________ Time: 01:26:05 PM PST US From: "A. Dennis Savarese" Subject: Re: M14PEngines-List: Re: Low RPM Look at the things that are common to both engines since the symptom has no t changed when you changed the engine.=0A- Prop=0A- Throttle Cable=0A=0AWha t did you set the blade angles to on the V530?- ie:- How many degrees a nd at what reference point on the blades?=0A=0AThe throttle cable sleeve mi ght be slipping.- If it slips at all, you will not get full throw at the carburetor.- That could be why you feel like you can push it further with no increase in RPM. - Check to see if the sleeve is moving anywhere from the throttle lever through the firewall and then to the carburetor.=0A=0AD o you have a fuel flow instrument in the airplane?- If so, what is the fu el flow at WOT on take off?- Normal for an M14P 360HP engine is between 3 7 and 41 gallons per hour.=0ADennis=0A=0A=0A=0A=0A_________________________ _______=0A From: john.pearson757 =0ATo: m14pengines -list@matronics.com =0ASent: Friday, October 4, 2013 3:00 PM=0ASubject: M14 "john.pearson757" =0A=0AThanks for the reply.=0ATh e prop is a 2 blade V530 - different governors.- It is going to the stop. =0AI think the throttle is OK.- When I reach 87%, I can push the throttle forward quite a bit more.=0A=0A=0A=0A=0ARead this topic online here:=0A=0A http://forums.matronics.com/viewtopic.php?p=409865#409865=0A=0A=0A=0A=0A =========================0A =================== ________________________________ Message 8 _____________________________________ Time: 01:37:37 PM PST US Subject: M14PEngines-List: Re: Low RPM From: "john.pearson757" Thanks Dennis, I'll double check all those things. I agree, it has to be something like that. J.P. 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