Modifying IO-360 C sump for forward facing servo

[jbasol]

All:

I am a Cozy 4 builder that has run into a snag with my engine selection. I selected the IO-360-C1C after learning that the A1A required cowl modification for the intake pipes (the C series sump does not).

Now that the engine is bolted on firewall and I'm starting to bolt accessories to it, I realized that the space between the servo flange and the firewall is too small to mount the servo and get a tube up to it. I did notice that the sump seemed capable of supporting the servo on the foreward face though.

In searching for information on forward facing fuel servos for IO-360-C series engines I ran across some helpful information in these forums. It seems a number of RV builders have made this modification, so I'm hopeful someone will have drawings that I can provide to a local machine shop to have them modify mine.

Thanks in advance!

-John Basol

[N941WR]

John,

Welcome to the VAF forum. Careful these guys may talk you out of sanding and into pounding rivets.

I recently saw a vertical sump IO-360 with a snorkel bolted on and the servo mounted to the other end in a horizontal orientation. Could you have something like that made up to put the fuel servo where you need it?

[jbasol]

Hi Bill,

Thanks for the words of caution. They wouldn't have much arm twisting to do on me either. I'm pretty sure I'm trading my sander for a rivet gun on my next project.

I tried to determine how to put some sort of snorkle in place that would allow me to mount the servo below the sump. While it could be done, it would mean having the servo facing the rear of the plane instead of into the NACA scoop airstream. Just isn't enought room in there. I should have made my own cowls (heck, I made everything else), serves me right for trying to save some time with prefabircated parts.

I thought about switching to a verticle sump as well, but the exhaust won't work with a verticle sump. So it seems modifying the existing sump is the easiest option.

Am I up the proverbial creek without propper method of propulsion or what???

-John

[Mike S]

As was said, WELCOME aboard.

I would try talking to the good folks at Airflow Perf they have a nice selection of parts that just might be what you need.

I am in the process of changing a vert induction to a horizontal using one of their elbows.

Good luck.

[chaskuss]

Originally Posted by jbasol

All:

I am a Cozy 4 builder that has run into a snag with my engine selection. I selected the IO-360-C1C after learning that the A1A required cowl modification for the intake pipes (the C series sump does not).

Now that the engine is bolted on firewall and I'm starting to bolt accessories to it, I realized that the space between the servo flange and the firewall is too small to mount the servo and get a tube up to it. I did notice that the sump seemed capable of supporting the servo on the forward face though.

In searching for information on forward facing fuel servos for IO-360-C series engines I ran across some helpful information in these forums. It seems a number of RV builders have made this modification, so I'm hopeful someone will have drawings that I can provide to a local machine shop to have them modify mine.

Thanks in advance!

-John Basol

John,
No drawings for you. However, any competent machinist should be able to inspect the mounting surface of the rear of the sump and replicate it on the front. He has to mill the casing flat, bore the inlet hole, drill & tap the mounting stud holes. You then need to fabricate a cover plate and gasket for the rear servo opening.
I'm emailing you some photos of an RV which has had this mod done. I hope this will help.
Charlie Kuss

[Vonsmallhousen]

I too have a simular problem with my IO360C1E6 and have been told that Divco in Tulsa OK can do the work and have done it on a IO360C1E6. Im down in New Zealand so looking for some down here to do the work.

Divco did come highly recomended though.

[az_gila]

Originally Posted by Vonsmallhousen

I too have a simular problem with my IO360C1E6 and have been told that Divco in Tulsa OK can do the work and have done it on a IO360C1E6. Im down in New Zealand so looking for some down here to do the work.

Divco did come highly recomended though.

...that does exactly what is needed to the sump...

http://71.144.98.137/lycoming/receipt7.pdf

[Vonsmallhousen]

Originally Posted by chaskuss

John,
No drawings for you. However, any competent machinist should be able to inspect the mounting surface of the rear of the sump and replicate it on the front. He has to mill the casing flat, bore the inlet hole, drill & tap the mounting stud holes. You then need to fabricate a cover plate and gasket for the rear servo opening.
I'm emailing you some photos of an RV which has had this mod done. I hope this will help.
Charlie Kuss

Charlie. Can you also email me the photos. It may be helpful for me as well.

Thanks Dean

[jbasol]

Well, good to know Divco can definately do it, though they may be a little proud of their work.

Hopefully, the machine shop I use for automotive needs will be able to do this. I'll give them a call tomorrow. If mine turns out well, I might be able to facilitate having others done as well. I'll update when I know more.

Thanks again for all your help folks!

[frankh]

The bosses for the studs are cast then this should be a very simple job if one has acess to a mill.

I bet you could even do it on a decent sized drill press.

Frank