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<DIV>You are getting 10.5K rpm with a OS91FX in a 15X8. Impressive. I do not get much more than that with a 13X8 on the stock muffler, which is real heavy. Think I should look into a wraparound header to use with the MACs pipe I have. Not as long the 140 pipe and probably only need to modify the bellypan and not the fuse.</DIV>
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<DIV>Which perry pump are you using? V30? is it on the firewall?</DIV>
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<DIV>Randy</DIV>
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<DIV><SPAN class=618141505-05112004><FONT face=Arial color=#0000ff size=2>Randy,</FONT></SPAN></DIV>
<DIV><SPAN class=618141505-05112004><FONT face=Arial color=#0000ff size=2></FONT></SPAN></DIV>
<DIV><SPAN class=618141505-05112004><FONT face=Arial color=#0000ff size=2>I need to build pipe tunnel in the bellypan. fiberglass lay up on a PVC pipe to make the tunnel. cut out the fuse around 4" behind the wing mounting. The fuse will also have some glass lay up to fill the cutout.</FONT></SPAN></DIV>
<DIV><SPAN class=618141505-05112004><FONT face=Arial color=#0000ff size=2>The entire glass work will probably weigh similar to the unmodified plane.</FONT></SPAN></DIV>
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<DIV><SPAN class=618141505-05112004><FONT face=Arial color=#0000ff size=2>Karl's header is a wraparound. I think that is his specialty. Just tell him how high the header has to be reference to the exhaust center line.</FONT></SPAN></DIV>
<DIV><SPAN class=618141505-05112004><FONT face=Arial color=#0000ff size=2></FONT></SPAN></DIV>
<DIV><SPAN class=618141505-05112004><FONT face=Arial color=#0000ff size=2>Above setup is for a stock OS 91SX-H w/ an extra head shim, Perry pump, Karl's header, 140 size carbon pipe (21" long). APC 15x8 with 20% had 10500rpm on a bench.</FONT></SPAN></DIV>
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<DIV><SPAN class=618141505-05112004><FONT face=Arial color=#0000ff size=2>I will have to run the engine again soon since I changed the crankshaft w/ 91FX's, Rear bearing with Boca SS. I am thinking about running the setup with 16 or 17" props as Nat Penton. (I gotta look for those E-mails from Nat)</FONT></SPAN></DIV>
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<DIV><SPAN class=618141505-05112004><FONT face=Arial color=#0000ff size=2>Ihncheol Park</FONT></SPAN></DIV>
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