---------------------------------------------------------- Stratus-List Digest Archive --- Total Messages Posted Thu 03/18/04: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:42 AM - Re: Ram heads with bigger valves (gary) 2. 07:54 AM - Re: Ram heads with bigger valves (HINDE,FRANK (HP-Corvallis,ex1)) ________________________________ Message 1 _____________________________________ Time: 03:42:52 AM PST US From: "gary" Subject: Re: Stratus-List: Ram heads with bigger valves --> Stratus-List message posted by: "gary" Frank, Where are your EGT's? (before or after the bend, how far from heads). Do you have anyone else's EA-81 EGT;s t compare to with sensors in the same spot? How did you set your mixture - plug color? I never checked mine and Ron didn't think I needed to make any changes so I left it alone. Gary ----- Original Message ----- From: "HINDE,FRANK (HP-Corvallis,ex1)" Subject: Stratus-List: Ram heads with bigger valves > --> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)" > > Hi guys, > > When I had my heads done, Ron installed bigger valves and did some porting > work. Not expecting to do any extra work I did a static run up with the > plane tied to a post to check the carb mixture settings as per the Bing > service manual...Which I have since misplaced so if anyone wants to donate > me a photocpy for all the nice advice my employer allows me to type.....:) > > Anyway, to my horror I found the carbs were set WAY too weak. Now > interestingly Stratus did claim that my heads had shown signs of overheating > which was another convenient "smoking gun" for them to explain why my valve > guides fell out for the third time.....But don't get me started....:) > > It MAY be that my carbs were set up weak to begin with by Stratus, I have no > way of knowing 'cus I never checked the mixture prior to having Ram work on > the heads. > > Anyway, bottom line is I had to increase my main jet by about two sizes and > my mid range jet went up quite a few sizes...Of course I can't remember by > how much, I do know it was an awful lot of time to get them right. > > What I will do is check my paperwork this evening and confirm to this list > what jets I have in there, I will then write it in my maintenance log as > well! > > So the moral is, if you have had this work done you really need to check > your jet sizes. Even though my plugs show correct colour I still see pretty > high EGT's like 1400F at cruise. I would hate to run this engine on the lean > side as these temps may be much higher leading to short engine life. > > I will confirm what sizes tomorrow, but remember this is specific to MY > engine with bigger valves. You would still need to check yours. > > Frank > > ________________________________ Message 2 _____________________________________ Time: 07:54:31 AM PST US From: "HINDE,FRANK (HP-Corvallis,ex1)" Subject: RE: Stratus-List: Ram heads with bigger valves --> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)" I would definatly check your plug colour...simply from the fact mine was miles out, but that was after installing bigger valves. The EGTs are after the bend. What you need to do for a quick check is to tie you airplane down and run it up to cruise (and that is defined as between 1/4 and 3/4 throttle) for 30 seconds or so...Watch the cooling!...Cut the engine WITHOUT closing the throttle and pull the plugs...If they are stark white the misture is too weak. There should be a white/tan colour. You can fine tune your mixture by raising the needles. If you get to the top position and still need more you have to upsize the nedle jet. Get back in and do the same thing at full power to check the main jets. It's a hassle but burnt valves are much MORE hassle....:) FRank -----Original Message----- From: owner-stratus-list-server@matronics.com [mailto:owner-stratus-list-server@matronics.com] On Behalf Of gary Subject: Re: Stratus-List: Ram heads with bigger valves --> Stratus-List message posted by: "gary" Frank, Where are your EGT's? (before or after the bend, how far from heads). Do you have anyone else's EA-81 EGT;s t compare to with sensors in the same spot? How did you set your mixture - plug color? I never checked mine and Ron didn't think I needed to make any changes so I left it alone. Gary ----- Original Message ----- From: "HINDE,FRANK (HP-Corvallis,ex1)" Subject: Stratus-List: Ram heads with bigger valves > --> Stratus-List message posted by: "HINDE,FRANK (HP-Corvallis,ex1)" > > Hi guys, > > When I had my heads done, Ron installed bigger valves and did some > porting work. Not expecting to do any extra work I did a static run up > with the plane tied to a post to check the carb mixture settings as > per the Bing service manual...Which I have since misplaced so if > anyone wants to donate me a photocpy for all the nice advice my > employer allows me to type.....:) > > Anyway, to my horror I found the carbs were set WAY too weak. Now > interestingly Stratus did claim that my heads had shown signs of overheating > which was another convenient "smoking gun" for them to explain why my valve > guides fell out for the third time.....But don't get me started....:) > > It MAY be that my carbs were set up weak to begin with by Stratus, I > have no > way of knowing 'cus I never checked the mixture prior to having Ram > work on > the heads. > > Anyway, bottom line is I had to increase my main jet by about two > sizes and > my mid range jet went up quite a few sizes...Of course I can't > remember by how much, I do know it was an awful lot of time to get > them right. > > What I will do is check my paperwork this evening and confirm to this > list what jets I have in there, I will then write it in my maintenance > log as well! > > So the moral is, if you have had this work done you really need to > check your jet sizes. Even though my plugs show correct colour I still > see pretty > high EGT's like 1400F at cruise. I would hate to run this engine on > the lean > side as these temps may be much higher leading to short engine life. > > I will confirm what sizes tomorrow, but remember this is specific to > MY engine with bigger valves. You would still need to check yours. > > Frank > > advertising on the Matronics Forums.