Lycoming IO-360 engine specifications

[PT20J]

I am playing around with an engine simulation program. I need some specifications that I've been unable to find and wonder if anyone has found them somewhere:

Connecting rod length (crankpin center to wrist pin center)

Valve timing: EVO, EVC, ICO, IVC in crankshaft angle ATDC

Skip

[N201MKTurbo]

5 hours ago, PT20J said:

I am playing around with an engine simulation program. I need some specifications that I've been unable to find and wonder if anyone has found them somewhere:

Connecting rod length (crankpin center to wrist pin center)

Valve timing: EVO, EVC, ICO, IVC in crankshaft angle ATDC

Skip

I’m pretty sure the rod length is in the overhaul manual. Every time you rework the rods, they get a bit shorter. There is a limit on how short they can get.

Not sure about the valve timing, did you look in the TCDS?

[EricJ]

14 hours ago, PT20J said:

I am playing around with an engine simulation program. I need some specifications that I've been unable to find and wonder if anyone has found them somewhere:

Connecting rod length (crankpin center to wrist pin center)

Valve timing: EVO, EVC, ICO, IVC in crankshaft angle ATDC

Skip

+1 that some of that should be in the overhaul manual.    The manual I have is the Lycoming "Overhaul Manual Direct Drive Engine".   At the end is the Table of Limits, which includes the center-to-center rod length as item 601.   For an IO-360-A- it shows mfr min and max as 6.7485 to 6.7515.   There are no service limits listed, so I guess that's the only limits.   Valve dimensions and tolerances are in there, but I don't see timing information after a quick scan.   The engine TCDS might have it.

[PT20J]

9 hours ago, N201MKTurbo said:

I’m pretty sure the rod length is in the overhaul manual. Every time you rework the rods, they get a bit shorter. There is a limit on how short they can get.

Not sure about the valve timing, did you look in the TCDS?

 

50 minutes ago, EricJ said:

+1 that some of that should be in the overhaul manual.    The manual I have is the Lycoming "Overhaul Manual Direct Drive Engine".   At the end is the Table of Limits, which includes the center-to-center rod length as item 601.   For an IO-360-A- it shows mfr min and max as 6.7485 to 6.7515.   There are no service limits listed, so I guess that's the only limits.   Valve dimensions and tolerances are in there, but I don't see timing information after a quick scan.   The engine TCDS might have it.

Thanks!. I couldn't find anything in the TCDS and I guess I missed the conn rod length in the OH manual -- makes sense it would be there since you would want to check for rod stretch due to an overspeed. Guess I can put a protractor on the prop and figure out the valve timing.

Skip

 

[carusoam]

For this deep of detail...

Lets see if @M20Doc is around... (technical question for tech gurus...)

Best regards,

-a-

[A64Pilot]

22 hours ago, PT20J said:

 

Thanks!. I couldn't find anything in the TCDS and I guess I missed the conn rod length in the OH manual -- makes sense it would be there since you would want to check for rod stretch due to an overspeed. Guess I can put a protractor on the prop and figure out the valve timing.

Skip

 

Your going to need a dial indicator too of course.

‘If your not certain how, look up how to degree a camshaft.’

Post your numbers if you don’t mind, be interesting to see what they are.