Lycoming Engine Identification

[Osceola Stumpy]

The engine ID tag say O-435-4. I know it is and angle valve. I was told that the motor is 265 HP @ 3500 RPM and the engine was in a seaplane.
any help would be great.

 

[rick]

If it's rated @ 3500 rpm's, I would think it should be a GO-435 (geared).

The O-435-4 says 225 hp @ 3000 rpm's per the "Certified Lycoming Engine List": http://www.prime-mover.org/Engines/Lycoming/Lyc_Cert_list.html

Rick

 

[Osceola Stumpy]

thanks Rick
When i get home i will gether all ith ID tag info and check the list.
the compression ratio on the tag is 8.3 to 1 if i remember correctly.

 

[dblj006]

By your the photo of your boat your cylinders look straight valve.

If they look like this or similar they are angle.

 

[Osceola Stumpy]

the motor that is currently on my boat is straight valve. the new (used) motor that is sitting in my shop is angle valve. I will be changing the motor in the next couple of weeks.

 

[Osceola Stumpy]

Once again Rick yo were correct.
Thanks for the help.

 

[jaxbrian]

neither of the engines i've had even had an engine ID tag...where are they suppose to be anyways?

 

[jpatter123]

neither of the engines i've had even had an engine ID tag...where are they suppose to be anyways?

side of the oil pan. I see a lot of rebuilders take them off. You should be able to see the rivet holes still though.

 

[Osceola Stumpy]

I found this site and when i call and talked to the people their they were very willing to help. the only thing you will need to do is provide part numbers. Here is the link.
i also told them they need to advertise on this site. http://www.preferredairparts.com/index.htm