With the intake valve open when the plug fires would it ignite the fuel in the cylinder and intake? I would imagine that would cause the other two cylinders to draw in a bunch of exhaust and cause all kinds of power loss. Might even travel back through the intake and cause problems on the other side of the engine.
Mark, is there any soot or other evidence in the intake manifold indicating fuel burning in there? Who did the heads on your engine? Were the seats replaced, just ground and lapped? Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of Colin Rainey Sent: Monday, October 23, 2006 3:09 PM To: KRnet Subject: KR> Engine compression loss Mark and netters Losing the #5 intake valve would cause the air fuel mix that entered the cylinder to be expelled back into the intake head area, causing the next intake of either #1 or #3 to be very complete as it would temporarily act similar to a form of boost, making pressure in the intake. At lower rpms it might possible cause the next cylinder to have a lower charge due to the reversion of the flow, but the third in the series would be unaffected. At higher rpms, this would be negligeable. Since #5 was making no compression, the engine would have to lug the mass of piston around as well as making power to run, so it would affect power by more the 1/5, more like 30 to 40%. You would also feel a very pronounced missing due to the dramatic difference between a cylinder that makes decent power and then the dead one. My opinion about the progression of your problem is that you began to run rich due to the carb issues, the associated carbon buildups resulted in hot spots in the cylinders, which lead to pre-ignition and detonation, which damaged the head area immediately around the intake valve. The carbon buildup would act like little matches lighting off the fuel early, especially when you ran the auto pump gas. JMHO... Colin Rainey Independent Loan Officer Branch 2375 Apex Mortgage Company 386.615.3388 Home Office 407.739.0834 Cell 407.557.3260 Fax brokerpi...@bellsouth.net _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
