Jeff, My motor does this as well, but only at low rpm's. This is typically due to overlap of the intake/exhaust valves. I've got a comptune cam that does this as well but to a much bigger extent.the duration of it is 318 and lift is over .5" The A-8 cam has a little less lift and little less overlap, but reliability is better and with the comptune cam you need to run at least 14:1. Have you checked at about 2k rpm when cold?
aaron ----- Original Message ----- From: "Jeff McNeal" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: 31 March, 2003 13:53 Subject: Tuning > Another lister mentioned something that I've noticed with my carbs -- the > slight pushing out of air with some fuel misting from the carb throat. My > engine seems to be running just fine, steady idle, good, strong acceleration, > no pinging and when I turn off the engine, no running on. I've not formally > set the timing, in part because I'm not sure exactly what it should be. I > started with a MkIV engine, but it's been highly modified from the head on > down, including a fast road cam from Ted Schumacher (.425 lift). > > All outward appearances tell me that the timing is just fine -- but the > reverse airflow from one or more of my carbs (at least when the engine is cold > -- I haven't checked it after warm-up yet) has me curious. > > Is this just a very fine tuning timing issue? Or should I be concerned about > something else? > > TIA > > Jeff /// [EMAIL PROTECTED] mailing list /// Send admin requests to [EMAIL PROTECTED] /// or try http://www.team.net/cgi-bin/majorcool /// Archives at http://www.team.net/archive /// Send list postings to [EMAIL PROTECTED] /// Edit your replies! If they include this trailer, they will NOT be sent.
