Question for Paul McBride, the General Aviation News engines expert: We are building a Van’s RV-10. The suggested engine is Lycoming IO-540-D4A5, which I understand to be a parallel valve type.
In searching for a used engine of this number, I’ve come across an IO-540-K1E5, which I understand is an angle valve engine. Researching “seems” to suggest these are similar “size” with regard to physical dimensions. Further research mentions narrow deck vs. wide deck engines.
Can you shed any light on whether the K series engine will physically fit and work in an RV-10? Any other choices you’d suggest? Any “gotchas” we need to be aware of?
Any suggestions would be greatly appreciated!
Fred McCaskill
Paul’s Answer: Fred, it looks like you’ve got yourself quite a project in front of you. I’m certain that you know that undertaking a project like this is a true labor of love, but the final rewards far outweigh any struggles you may encounter during the build journey.
Now, to get to your question regarding engine choices.
First, I’m going to recommend that, if you haven’t already done it, you contact the Van’s user group or other Van’s builders to inquire if they have used the IO-540-K series engine in their projects. This would, no doubt, be the best source of information for you.
Should this not provide you with any helpful information, I’ll share with you what my research has come up with when comparing the two engines you mentioned.
First, let me give you some dimensions for the IO-540-D4A5, which is rated at 260 horsepower @ 2700 rpm. Yes, it is a parallel valve engine, which is approximately 410 pounds dry weight.
The measurements are:
- Height: 24.46 inches
- Length: 38.42 inches
- Width: 33.37 inches
The IO-540-K1E5, which is rated at 300 horsepower @ 2700 rpm, is an angle valve engine and weighs approximately 470 pounds dry weight.
Measurements are:
- Height: 20.86 inches
- Length: 37.19 inches
- Width: 34.25 inches
Both of these engines use the Type 1 Dynafocal mount.
Fred, as you can gather from the measurements, there is quite a difference in these two engines, not to mention the engine weights.
The engine you choose will definitely impact the design of the cowling, engine baffling, etc., which is why your best source of engine choice and installation will be from “someone who has been there and done that.”
I’ll be the first person to admit that people buy horsepower, but in your case, I’d have to think long and hard to decide if the additional hassle installing the IO-540-K1E5 would be worth the struggle.
Again, this is my opinion, but since you’ve found the IO-540-K1E5 engine, it might be less difficult to find someone who has already done this installation and would be willing to share their knowledge.
There is no doubt that the RV-10 is a beautiful aircraft, and I wish you all the best in completing your project regardless of the engine you choose.
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