Paul Eastham
Well Known Member
Hi guys,
Is there some obvious trick I'm missing to getting the exhaust pipes to clear the cowl at the exit? Vetterman no-muffler pipes on a 9A.
On the right side, I have about a half-inch clearance at both the cowl and engine mount, which is what Bingelis' book says you need. Yet it is clearly hitting both the cowl and engine mount (based on rub marks), probably at startup.
The problem is that increasing clearance at the cowl means decreasing it at the engine mount. I have already trimmed cowl away forward of the hinge line. I have also tried rotating the pipes a litte, but need to experiment with this some more.
The only other clue I have is that a neighbor (asked to watch for oil leaks at first engine start) noticed that exhaust pipe was vibrating more than the other. How much he didn't say.
Any advice? Any chance I don't need more clearance, but more rigidity in the hangers? They are installed per Vetterman's plans.
Thanks - Paul
Is there some obvious trick I'm missing to getting the exhaust pipes to clear the cowl at the exit? Vetterman no-muffler pipes on a 9A.
On the right side, I have about a half-inch clearance at both the cowl and engine mount, which is what Bingelis' book says you need. Yet it is clearly hitting both the cowl and engine mount (based on rub marks), probably at startup.
The problem is that increasing clearance at the cowl means decreasing it at the engine mount. I have already trimmed cowl away forward of the hinge line. I have also tried rotating the pipes a litte, but need to experiment with this some more.
The only other clue I have is that a neighbor (asked to watch for oil leaks at first engine start) noticed that exhaust pipe was vibrating more than the other. How much he didn't say.
Any advice? Any chance I don't need more clearance, but more rigidity in the hangers? They are installed per Vetterman's plans.
Thanks - Paul
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