470J to 470R

[hotrod180]

A guy I know is preparing to swap the 470J in his 54 C180 for a 470R.
I guess since the R isn't listed on the TCDS for the 54, a field approval or STC will be required.
I guess there's some changes to the R required to acomodate the 54 cowl, dual exhaust, & 0751001-1 mount.
An stc should have all the details listed, but otherwise he'll have to figure it all out on his own.

I have the 180/185 Club "club manual" on pdf,
but the index doesn't seem to list this K-to-R swap-out,
and there's literally hundreds of pages to go through.
Does anyone know if this info is in there?
Or have paperwork from this mod detailing the changes required?

Thanks.

 

[skywagon8a]

For a quick reference first I'd look at the TC. https://drs.faa.gov/browse/TCDSMODEL/doctypeDetails?modalOpened=true See Note 5

The R is the same as the L except for damper configuration.
The L is same as K except for relocated carburetor and revised sump.
The K is similar to the J except...revised mounting brackets.

There are enough differences there to indicate that this is not just an engine swap.

I could not locate an STC on the FAA's STC listing. Perhaps it's there, I couldn't find it.

 

[hotrod180]

....There are enough differences there to indicate that this is not just an engine swap.....

Exactly, Swapping the J for a K is pretty simple,
but with an R the oil pan & maybe induction become issues.
I think he's buying a new or re-manned engine, apparently he can get a K but it's a lot shorter wait for an R.
Might be worth waiting though.

The 180/185 Club has a sample J-to-R STC they'll sell you for a couple bucks,
but it's a "one time STC" (which seems to me like a field approval, not an STC).
He bought it, apparently it does have some good info, but still leaves some questions unanswered.

 

[skywagon8a]

One time STCs are issued which are not field approvals. There are more hoops to jump through. I have one for a fuel tank installation. If he has all the data which goes with it, it should place him in a good position to get one for his airplane using the same data. He may need to get permission from the original holder of that STC, not just a copy of the document.

 

[eskimo77]

Frank Shea STC SA00164BO
https://www.supercub.org/forum/showthread.php?59339-STC-O-470-K-to-O-470R

 

[Charlie Longley]

I did an O470R in my 180 using Frank's STC. Pretty straight forward. Have your friend call me if he has any questions.

 

[hotrod180]

Thanks guys.
I'll pass along your contact info to him, Charlie.