First time poster here on vans forums but I've been studying for a long time. I also don't have an RV but someday....hope to grab a -7.
I currently own a rans s-16 shekari with an io-320 that I have owned for a few months. I have put over 50 hours on it since March. I purchased it from a guy that lived at sea level. I live at 7200 feet in Wyoming. I knew going into it that I would have some tweaking to do based on my elevation. The plane at sea level was only getting 2500 rpm at wot. I figured it was just pitched too coarse (68-74) and ordered a new ed sterba prop (68-70) as soon as I got it home. I put the new prop on an barely gained 50 rpm....so I sent it back to Ed, he re pitched it to a 68-64. I put it on and had zero rpm change. What's going on here? It's like it's stuck at 2500 rpm wot straight and level. I can get it to go to 2700 in a 2000 ft/min dive but pulling out to straight it goes back to 2500. No change in speed between 70 pitch and 64 pitch.
I have checked all the simple stuff, compressions all 76/80, cleaned injectors, checked spider, blew out all injector lines, plugs look good (slightly lean), cleaned air filter, exhaust is clear, throttle cable adjusted correctly, mixture cable good.
My a&p thinks it's the servo, I tend to agree but just wanted some other opinions. I am leaning toward the fuel servo because I have very little lean adjustment at cruise and wot. I can only lean 1/2-3/4" from full rich (cable is adjusted correctly).
Egt's
1 - 1325
2 - 1400
3 - 1325
4 - 1300
Cht's
1 - 300
2 - 300
3 - 300
4 - 350
Any ideas/opinions why I can't get over 2500 rpm?
I currently own a rans s-16 shekari with an io-320 that I have owned for a few months. I have put over 50 hours on it since March. I purchased it from a guy that lived at sea level. I live at 7200 feet in Wyoming. I knew going into it that I would have some tweaking to do based on my elevation. The plane at sea level was only getting 2500 rpm at wot. I figured it was just pitched too coarse (68-74) and ordered a new ed sterba prop (68-70) as soon as I got it home. I put the new prop on an barely gained 50 rpm....so I sent it back to Ed, he re pitched it to a 68-64. I put it on and had zero rpm change. What's going on here? It's like it's stuck at 2500 rpm wot straight and level. I can get it to go to 2700 in a 2000 ft/min dive but pulling out to straight it goes back to 2500. No change in speed between 70 pitch and 64 pitch.
I have checked all the simple stuff, compressions all 76/80, cleaned injectors, checked spider, blew out all injector lines, plugs look good (slightly lean), cleaned air filter, exhaust is clear, throttle cable adjusted correctly, mixture cable good.
My a&p thinks it's the servo, I tend to agree but just wanted some other opinions. I am leaning toward the fuel servo because I have very little lean adjustment at cruise and wot. I can only lean 1/2-3/4" from full rich (cable is adjusted correctly).
Egt's
1 - 1325
2 - 1400
3 - 1325
4 - 1300
Cht's
1 - 300
2 - 300
3 - 300
4 - 350
Any ideas/opinions why I can't get over 2500 rpm?