flyerdave

My Feedback: (212)

I have a 40 fsr that has a broken fin on the head and I have found a 40 fp parts engine. I was told that the heads are interchangable. Is this correct? Thanks

AMB

Yes according to Davis the diesel heads will interchange so the glow heads will also martin

gerryndennis

Hey Flyer,

Yep, same part number for the heads on each engine.

A recent change of opinion.

Dave H

flyerdave

My Feedback: (212)

Thanks for the help.

Bax

My Feedback: (11)

Our old O.S. Parts book shows that the O.S. Max .40 FP and the O.S. Max .40 FSR engines had the same cylinder head. Yes, the part numbers are exactly the same.

aspeed

I wouldn't worry about a broken fin, it shows character. Break one on the other side to make it match.

Bax

My Feedback: (11)

Yep, one broken cylinder head fin won't hurt a thing. Cooling won't be compromised to any extent at all. However, the head should be replaced if you cannot stand the appearance. Burned-on gunk will cause more cooling problems than a broken fin.

SKuhn68

So now that it has been established that the heads are interchangeable, can someone tell me what IS the main difference between the FP and FSR versions of the OS 40? Which one is the better engine?
SKuhn68

Hobbsy

My Feedback: (102)

OS Max 40FP


http://sceptreflight.com/Model%20Engine%20Tests/OS%2040%20FSR.html

For some reason the links go to the same test, go here and scroll down to OS 40 FSR: http://sceptreflight.com/Model%20Eng...sts/Index.html

SKuhn68

Thank you very much, that was extremely helpful.
SKuhn68