Definitely if it's off in the right direction it'll knock.
Bill Cardell TurboDog's Dad www.flyinmiata.com www.fmwestfield.com Sales 1-800-359-6957 Tech 970-464-5600 Before you call, check out http://www.flyinmiata.com/FAQ/ -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Monday, November 15, 2010 1:22 PM To: Bill Cardell Cc: [email protected] Subject: Re: Mostly stock 1.8 knocking under uphill loads at low-mid rpms It's certainly possible, is that known to cause low rpm knocking because the stock ignition map isn't tailored for efficient chamber filling on at low rpm? On Mon, Nov 15, 2010 at 01:18:02PM -0700, Bill Cardell wrote: > Any chance you're off a tooth on a cam? > > > Bill Cardell > TurboDog's Dad > www.flyinmiata.com > www.fmwestfield.com > Sales 1-800-359-6957 > Tech 970-464-5600 Before you call, check out > http://www.flyinmiata.com/FAQ/ > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > [email protected] > Sent: Monday, November 15, 2010 1:13 PM > To: [email protected] > Subject: Mostly stock 1.8 knocking under uphill loads at low-mid rpms > > I have a 95 1.8l which is mostly stock in addition to my modded turbo > 1.6. > > Recently I remanned the head and cleaned up all of the carbon from the > piston tops and combustion chambers. Everything was immaculate on > reassembly. > > While the head was off I also took advantage of the opportunity to > blend the transitions from the intake and exhaust runners to the valve > seats, in addition to port matching the stock exhaust manifold. > > The car runs great, and makes significantly more torque everywhere. > The ignition timing is advanced slightly over stock, only 2 degrees. > Even running 89 octane I have noticed knocking around 2500-3500 rpms > when gently climbing hills. The knocking is easy to drive around by > just selecting a shorter gear and getting the revs up. > > Is there anything easily tunable on the stock ECU without breaking > CARB rules to address this problem? Is it a known issue? I can't > tell if it's due to ignition timing or fueling, but running 91 octane > seems to eliminate the problem. The car runs great in all other > conditions, there doesn't seem to be a vac leak or anything like that. > The injectors have never been cleaned so I'm inclined to send those > out to be serviced. > > If I were the only person driving the car, it would not be much of an > issue. But my significant other drives this car daily and she is not > so much of a gear head, and drives through San Francisco every day, so > hills and thus knocking are probably a regular occurence. > > Any input appreciated! > > _______________________________________________ > Miatapower mailing list > [email protected] > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
