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Unfortunately not all was plain sailing, at 5.5k rpm the fuel was being trimmed out by a Gremlin and it appears that the crack in the manifold is drawing in air at certain rpm's which is upsetting the Lambda sensor and the crank position sensor is iffy and needs replacing. :(
I've swapped the distributer for another since last time, but it would appear that this hard work is too much to ask of these old sensors and needs to be replaced with a new one.
It took 2 hours of head scratching to find this Gremlin and to fudge it over so we had plenty of these.
There should be enough puff now to be nearer to 500 than 400 at the flywheel, yet because of the Lambda Gremlin the timing has had to be pulled right back and the rev limit reduced to 6k until I get the manifold sorted.
We had 2 quick tries of swinging the cam timing, one @ +1 inlet -2 exhaust and another the other way @ -1 inlet +2 exhaust and both reduced power by the same amount. Dan reckons there's a sweet spot we'll find that will even out the dip in torque curve we'll find next time find without the Gremlins, so back to stock settings for now.
I didn't get away until 7pm and we had no time to tinker with the water/meth, yet without it, the max temp of post heat soaked charge-cooled air was 36°C @ 6.5k rpm.
Reducing the torque-convertor lock to 2k rpm has improved the power delivery at the beginning of the curve. :)
Yet beginning to think that the dip in the curve could be torque-converter slip?
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