Irvine 150

[Broken Wings]

I ran my Irvine 1.50
stock OS 1.60 muffler
Vess 17x6 propeller
Sig Champion 15% nitro fuel
medium hot OS 7plug
9000 rpm
Cylinder head temp never went over 160 Deg F.
Transition was excellent, very smooth running engine.

[jeffie8696]

Dang you, now Igotta get mine running.

[jeffie8696]

Brand new engine, Factory idle bar plug, 5% SIG Champion fuel, Zinger 17X5 wood prop, rich break in tune saw 9000 on just the second tank. So anybody know if this engine is a torque or a revver?

[airraptor]

torquer for sure. I have ran mine on 15x14s. I dont remember the numbers nice and smooth engine but wasnt as strong as I thought it would be. The moki 135 had more power on the 16x10 size props.

[jeffie8696]

I am used to my small high revving engines turning 10" props to 15,000 rpm. Just 9000 rpm to me is "unfamiliar". I guess like my four strokes I will be going with higher pitch props. So in your opinion was the Irvine a good running reliable engine worth keeping like all my others? Its hard for me to believe the 1.50 is underpowered when all my other Irvines (I have quite a few) are so excellent. Is 9000 a good static rpm to prop for with this engine? I see the 1.20 AX is listed with a 9000 rpm max useable rpm.

[airraptor]

I never pay attention to the max rpm they list. I ran my 120 AX engine over 11,500 on the ground. The irvine I had only had a couple of tanks thru it. Yes keep it and they are great looking engines. i both a OS 160 and this one and maybe I can run them this weekend. I usually run most engines open exhaust as that is a great indicator of its performance and a good standard. mufflers can vary greatly so open exhaust is best. The irvine 150 has a small carb so it will draw very well and make great torque at low rpm. I would prop it so its in the 8,000-8,500 range for most sport planes. I plan to make an adapter so I can run a Jett 120 muffler on it and see how it performs.

[jeffie8696]

Mine has the OS adapter and ASP 1.80 muffler.