Big thanks to all
Len Sabatine
sabatine at epix.net
Mon Dec 4 14:01:59 GMT 2000
><snip> Basically, I am
>building a plan of attack for reassembly and tuning. So far, this is my
>plan .... (chime in if you see something that you could comment on) ....
>
>1) Go to a higher temp thermostat. Currently running a 160. Seems to me
>that I could benefit from higher temps without losing any performance.
>I am planning on a 180 deg thermostat.
> Easy , try a 195 d stat
>2) Use a standard plug. I'll be installing AC Delco plugs gapped at 0.040.
> I have a supercoil and an MSD ignition system.
Try Autolite Platinums @ .040 gap
>3) New heated O2 sensor. If I am running rich then I believe the O2 must
>have something to do with it. I am not (obviously) running around in OPEN
>loop all the time. The car spends the majority of its time in closed loop
>so it seems to me that I must be running rich in closed loop also. The
>fact that it appears I am running rich in ALL cylinders adds to this theory.
>4) Up the fuel pressure and raise the injector constant. Theoretically
>this should atomize the fuel more. Any increase in atomization would have
>to be a benefit at this point (not in terms of performance ... but in terms
>of not pooling fuel). It may or may not help. But, I cannot see it hurting.
>5) Decrease timing advance at WOT. Was running a total of 42 degrees of
>advance at WOT. If the Bosch +4 plugs are masking the flame then the new
>plugs won't need all of this advance. Furthermore, given what I will be
>doing in number 6 below ... I can get away with less advance. Probably
>start with 38 deg total advance and then work down from there.
>6) Decrease fuel at WOT. Probably start with an AFR of about 12.2 and then
>slowly lean it out via checking the plugs and watching for knock.
Try 36d total spark WOT.
>That's pretty much it. The only other concern that I have is why the intake
>valves on my heads look wet. If it was gas then it wouldn't be there
>anymore.
> Could be Oil ... but, I don't see the 'smoke at startup' symptom for bad
>valve seals. If it matters ... I am running Positive control valve seals
>on the AFRs.
>Hurt engines can look wet , so can those that run too cold and too rich.
>.. Len
>Tim
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