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My carby Citroen AX has 2 coolant hose's that heat the base of carby. I had a 1600 crossflow ford that used to heat the intake manifold with coolant from the head.
My engine has just starting to predetonate a little when going up hills with the warmer weather here in NZ. Timing is well advanced for economy.....
I will need to lower my air intake temp a little for longer trips on hot days or avoid hills, shorter journeys are okay.
We have a lot of Taxis and cop cars running on liquid petroleum gas, lpg or propane. It does save money in fuel costs, though requires different ignition and tuning to run as good as petrol.
CNG or compressed natural gas is really cheap and low in emissions, but down in power. Service stations providing CNG were pressurized to quit supplying CNG around 10 years ago. Shame, we have tons of it here.
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