Intake Manifold/System, Odd...and Bolt Torque?

[VF84Sluggo]

Anyone know what kind of intake system this is? Has a pipe-in-a-pipe. The engine is a Lycoming IO-360-B1B. RV-4 with a James cowl/plenum.

I've got a couple of things going on. At my CI three weeks ago, they were unable to get the intake pipes loose to replace the intake gaskets/hoses, and hopefully fix an induction leak that is affecting all 4 cylinders at the same time. The shop owner said he's never seen anything like this (just my luck ) The other issue points to the fuel servo needing overhaul.

Once back at my home airport after the CI, I decided to get this stuff done. I've removed the fuel servo and divider, sent it off for IRAN.

Now to tackle the intake system. Has anyone seen an apparatus like this? I'm guessing I'll need to remove all the intake flange bolts and lower this down as one piece.

And what is the torque setting for tightening the intake flange bolts?

Thanks in advance!

Oh...I'm replacing the sniffle valve, too. Who knows, this thing could be failing to close and thus creating a leak that would affect all cylinders at once. I'm thinking some type of sealant would be warranted when installing the new valve.

 

[Flyhud]

http://www.skydynamics.com/images/information/4-cylinder Maxi-Sump Rev.pdf

 

[VF84Sluggo]

http://www.skydynamics.com/images/information/4-cylinder Maxi-Sump Rev.pdf

That sure looks like what I have. This is a HUGE help, would have likely never found this on my own. Thanks!

 

[BillL]

Dave Anders used the same manifold until he made a new intake plenum - there is a KitPlanes article about it. Built for speed!!

 

[VF84Sluggo]

I'll search for the article. Thx!

 

[BillL]

I'll search for the article. Thx!

https://www.kitplanes.com/induction-wave-propagation/

I think he has more than one.

Bill

 

[Southern Pete]

It looks like you have the full SD set up, intake, sump and exhaust, which gives something like a 10% power bump. The installation instructions are on their website. Be aware the usual intake studs are replaced with bolts and O-rings are used to seal the cylinder end of the inlet tubes.

 

[VF84Sluggo]

It looks like you have the full SD set up, intake, sump and exhaust, which gives something like a 10% power bump. The installation instructions are on their website. Be aware the usual intake studs are replaced with bolts and O-rings are used to seal the cylinder end of the inlet tubes.

Thanks for the reply.

Yep, intake bolts. And O-ring seals answer my question. I assume, then, that your standard Lycoming or Superior intake cylinder flange gasket will NOT work with this setup, right?

 

[Southern Pete]

Correct, use the O-ring that SD specifies. The manuals are on their website.

 

[VF84Sluggo]

Has BOTH gaskets and o-rings?

I posted this in a separate thread...

Dropped the SD manifold down yesterday after finally finding a leak with the soapy-water check. I saw the edges of gaskets, but after removing the pipes, saw o-rings, too. Three out of the four cylinders were not leaky, only the back of #4.

So now what? Just go back with gaskets only? O-rings only? Both doesn't make sense. And you can see in a pic the o-ring on #4 was pinched (and this was the area of the leak.)

And, SD has mostly been NORDO on me; calls and messages-left go unanswered. If I knew what size/type these o-rings are, I'd get them from somewhere else.

 

[VF84Sluggo]

Correct, use the O-ring that SD specifies. The manuals are on their website.

I ordered these. It's a wag as best I could tell from using a ruler to measure one of the o-rings. Hope it fits. As well as I hope it is rated for the heat of a cylinder head.

 

[VF84Sluggo]

Wow! Talk about GREAT service from McMaster-Carr

I ordered these gaskets yesterday, regular UPS shipping, and they showed up today. And it looks like I guessed right: the o-rings are the exact size. I'm going to go with them, not wait for Sky Dynamics. I'll see how they work.

 

[VF84Sluggo]

To anyone still looking at this thread:

Instructions call for 75-80 in-lbs torque on the flange bolts. SD also recommends a bit of anti-sieze or other thread lube on the bolts.