exhaust pipes - cutting lower cowling

[KCOI7]

I put on the wagaero stainless steel exhaust pipes. Now my lower cowling will not fit. Pipes flare out too much.

Reviewed drawing 7-472. The holes for the pipes (n my cowling) are very close to the drawing dimensions.

I have seen other aeronca's that have those holes cut up.

Is this a common issue?

PS: Wagaero is sendinganother set - after they checked them in the jig.

[Richard Murray]

Unfortunately a lot of the "PMA'd" parts from Wag-Aero fail to fit. They have always been receptive to replacing the part, however the "jig or fixture" fixture used to produce the part is still incorrect.

[KCOI7]

I ended up getting 2 sets of wagaero stainless stacks. all 4 had "variations".

a bunch of trips to a nearby machine shop that really know their crap.

Both pipes had to be cut near cowling exit. Had to add about an inch - slightly wedge shaped.

Avoided cutting the cowl.

The flanges fit perfectly on all 4.

[Richard Murray]

Glad to hear you had someone locally who could weld stainless.

[KCOI7]

I was lucky - the guy's shop is close to the KCOI. Ronny Waddell. Said he used to make piper & velocity exhausts. Saw some other projects - everything looked pretty jamm-up good.