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Normal or Super Petrol????
Posted: Thu Apr 18, 2019 3:35 pm
by Wilts289
Hawk 289 passed (barely) it's annual MoT, bit iffy on the CO2 aspect. I'm running a 3.9l with the ubiquitous Weber, timing at 800 rpm 12 degrees, all in (32) at 2800. Jets .83 Rods 63/47. Oil changed/new air filter etc. and a good blast before test. I Generally use 95 octane with no problems, but wondering if putting in a tank of super just before next MoT would lower the emissions, even if by a little?
Re: Normal or Super Petrol????
Posted: Sat Apr 20, 2019 3:51 pm
by stevieturbo
Nope.
Re: Normal or Super Petrol????
Posted: Sat Apr 20, 2019 7:45 pm
by sidecar
It is possible to get quite a clean burn with the 500 carb but you need a means of monitoring the exhaust gas AND big collection of rods and jets.
Your current setup is around 7% leaner than the base setup on cruise and more or less stock on the acceleration circuit.
Re: Normal or Super Petrol????
Posted: Tue Apr 23, 2019 2:04 pm
by Wilts289
Ok, I was hoping that with less ethanol in the high octane petrol it might have given me a slightly cleaner burn!
I will borrow brothers Gunsons CO2 thingy and play with the selection of jets/rods that I have around!