Tuesday, May 15, 2012

Tweaking the PI

Just spent a few hours in the shed tinkering with the white PI after yesterdays dyno run.

Adjusted the tappets to 0.010" hot - they hadn't been done since the head was re-torqued when they were set to 0.011 on the inlets and 0.012 on the exhausts - there weren't any horror stories of valve recession even though this new head is not inserted and regularly sees 6500rpm. I use Redline lead substitute and it seems to work. There were minor variations probably due to 6 different pushrods being fitted at the head swap settling into their new homes.

Took off the metering unit and gave the full load screw approx a 1/3 of a turn in which equates to the full load setting going from 0.065" to 0.068" - this should help the top end fuelling/power which was a trifle lean at 13.2 AFR.

Also changed the advance curve on the 123Tune distributor - added 2 degrees advance in most areas so I now have 34deg total advance and added fair bit more between 2000 and 3500 where the engine is off cam and not making good torque - apparently Steve Attenboroughs GT6 with the same cam and similar exhaust responded well to a large increase in advance at low revs.


Advance curve used for dyno run (add 10deg to figures for total advance)


New figure for trialling - note seriously increased lower end figures - will be interesting to road test and see if this works

Just need to confirm what gap to run with the new racing plugs I've been using - NGK B8EGV - I was convinced they would foul but they have been as good as gold. I currently have them set at 0.025" but will try 0.030" and 0.035"

Very tempted to go and see if it makes a bit more power on the dyno with these fine tunings but I think I'll wait until I play with the cam timing - we are thinking about retarding it a couple of degrees to let the power extend to about 6000 but I will be road testing and  adding further adjustments before doing the cam tweak.

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