0-290d exhaust valve

[whatsit]

Hi all
I'm in need of a tagged serviceable 0-290d exhuast valve, the Lycoming number I have is 61631.

Does anyone know where I might get one?

Thanks

[flybynite]

You might try Don George http://www.dongeorgeaircraft.com/ . They seem to have a lot of 290 parts. After you have recovered from the sticker shock and if the engine is an experimental, you could go with a 1/2" valve. My IA and I could not find any authorization to do so for a certified acft, but it seems to be done with some frequency.

I was looking at the 290 parts manual and found a reference to 66531 used in the service cylinders (no longer available) which has since been superseded to 17B19712 still available at $834.00


Cheers

Wayne

[whatsit]

Thanks for the info Wayne. I knew they would be pricey but 800 bucks, wow!

Thanks again I'll give them a try

Whatsit

[Steve Pierce]

Gibson Aviation has authorization to use O-235-L2C exhaust valves in the O-290D2. You might give Mark and Marshal a call.

http://www.trade-a-plane.com/pdf/0000670023

[Marty57]

Hi Steve,
For us exp. guys, we can do just about anything to our engines as long as it is safe. That said, can I use the O-235-L2C exhaust valves in my 0290 D2? Do they have to be cut to proper size or are they a direct replacement? What about intake valves, any other valves compatible? Also, any way to check on the valve stem size with the rocker cover off? My engine had a top overhaul about 300 hours ago but not sure from the logs what valves were used, The top was in the mid '90's. The engine is in my garage on a stand awaiting my 2+2 (2+ years!!!)
Thanks,
Marty

[gander]

You should put some 0435 jugs on the 0290 with high compression pistons then you will have a rocket.

[A BELLAND]

Can someone explain why the 0435 jugs would make more power.
How high of a compression ratio before it turns into a avgas only engine.
Just curious why this works??
Aurele

[Steve Pierce]

The O-235-L2C guides are .438" OD vs. O-290 cylinders which has a .404".

[gander]

the cylinders you want to use are GO or VO cylinders which are angle valve and they will bolt up. angle valve make more power than parallel, standard on go435 is 6.3 the vo435 is 8.7 the highest compression pistons in angle valve available are 8.7 and are very expensive. If someone knows of a higher compression piston than that please let me know.