Sorry for the typo. Yes it is a B box. No the Kool prop was on an Avid. Guess thats out of the question. I am currently running a GSC prop. I love it. It’s smooth and pulls real well. I was just looking for something a little tougher for the kind of airstrips I plan to land and take off on. Ive heard the Ivo was a smooth prop and people love the ease of adjustability but it was not the performer that other props on the market are. You seem to like yours. Is there one model thats superior to another? Thanks JimChuk
What do you guy feel is a safe max propeller length for the 582/c box/ Mark IV set up? I'm running the 2.58 : 1. I'm looking a three blade? I have a three blade Kool Prop in my Avid stuff. It was off of a 912. I have been looking as a Power Fin.
Nlappos, I am very interested in this engine swap you have going on. I have on many occasions thought about the 670 as the next engine for my Avid. For some reason I thought I read on Rotax Rick's site that the 670 could only be mounted upright. I will be watching how this works for you. Please keep posting installation photos. The exhaust looks good. Is Mike selling these modified elbows? If so how much is he charging. I have access to a good 670 engine I've been going to grab for this purpose. At least I could use it as trading stock. Thanks again for the update.
I had high EGT temp when I first ran my engine. My probes were places 3 1/2 out from the face of the manifold. From the piston skirt to the the face of the head (with gasket) is 59.50 mm or 2.3 inches. That leaves 40.5 MM plus 1 mm added for gasket differences. You can see from the pictures how its all laid out. So the way I read this is if your probes are farther out that 1 5/8 from the face of the manifold you are to far out. Other articles say that if you place the probe 1 1/2 on the short side and 1 5/8 on the long side you are in the cone of the flame. Putting the probe in the side puts the probe into the outer side of the flame which would give higher readings.
Here is the article: Rotax simply define the location of the sensor's probe as being 100 mm from the pistonskirt which is fine so long as you can relate that information to the exhaust tract as a whole. The first illustration shows the distance from the piston skirt to the manifold mounting face including the compressed gasket which is 59.50mm for a 582 engine. The remaining 41.50mm is within the manifold itself so therefore the positioning of the probe hole is important to ensure reliable indications. Too far downstream of the correct location will result in higher readings and likewise too close to the piston will yield lower readings. Think of it in terms of a welders gas flame where the hottest part just beyond the blue tip and the coolest inside the cone. Lay the manifold so that the welded flange is parallel to the work surface. Cut two pieces of thin aluminium cut to the dimensions of the flange faces and mark their exact centers in each plane. Tape these to each mounting flange. Mark a line on each of the manifold branches exactly 38.00mm back toward the ball junction and parallel to the welded flanges. Next mark a line exactly half way across each of the branches. Where the lines intersect is the positions of the probe tips. Because the flange faces are welded onto the branches at an angle the position will be different dependent on which face the probes will be mounted. It is important to remember therefore that the spots indicate where the tip should lie and it will be necessary to place packing washers under the mounting bands to adjust the insertion of each probe. If the tips lie closer to one wall then again there will be errors in readings.
I would love to get my hands on a set of plans to make skis. I think wheel skis would work better for my plane and location as we can have little snow at my place and have over a foot jut 10 miles North of us. Our winter weather seem to always slide to the North. There are a lot of very nice airfields in Northern Idaho that I could access during the winter if I had skis.
Those EGT probes look a little far out on the exhaust. If I remember right the short side probe hole was suppose to be out 1 1/2 from the manifold port surface. The long side was 1 5/8. A little further out will give you a higher temp reading. The article I read said the probe should be center the flat in the cone of the fire l had to change mine become someone put them 3 1/2 inches out. I was getting high readings all the time.
Thank you dholly, I appreciate you taking the Newbie in. So, will I need to purchase a camping pass? When you say bat barn loft does that mean you will have a place for me to sleep or will I need to bring my tent? Sorry, I might ask a lot of question until I figure out the group terminology. I have absolutely no problem helping and keeping up in camp. We are a camping family and I have to have a clean organized camp. A lot of it has to do with me not being at home and needing to stay busy and the fact that I'm anal about everything......it drives my wife nuts!!! Sounds like you guys are set up. I will download the app and get my AN list ready! Thanks