It's Hammer dyno time!
The story so far. Engine in, all systems go but still having issues with the tune. I tried a few changes, emailed back and forwards to my man in the US but I realised I was wasting my time.
So I made a booking with a tuner that had previously tuned a carb'd car years ago and he got results. Not cheap but - $1,350 AUD which would be about $1,000 USD.
First up he checked the settings, then spent about an hour running the engine and playing with the ignition and fuel maps. Really not much to see, just sitting on the dyno running at light loads.
Finally, the time came to do power runs. I had decided to put a 6,500 rev limit on as I wasn't sure how much revs the standard roller block could take. I'd been told 6,500, 7,000 and 7,500 but none of them were going to pay for a blowed up motor, so 6,500 it was. Another factor was the cam was rated to 6,600 for power.
First run: 325 hp at the treads. He made a total of 8 runs, with all but one increasing power as he tweaked tables and numbers. The final run gave up 355 hp and about 330 ft/lb at the wheels. But more importantly, it had a fat flat torque curve and the fuelling was much cleaner. Driving it revealed it was back to how it was without the timing and fuel management and basically drove like a modern car - no snatch out of third gear corners and 1,200 rpm, hauled the mail when it needed to. And the idle has come down about 100rpm and it is much cleaner.
Hopefully now I just drive it and don't worry about it not starting, idling, or going. Yesterday was 37° C or about 98 F° and the engine temp stayed steady at 90-91°C (195) in traffic and came quickly back down to 84° C (184) whilst driving. Have to be happy about that.
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