Technical > Spud Miller's Cave

jet change for nitro

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alkyal:
I realize this is a Fuel Injection thread. I have read most of Spuds articles on the change over from Straight Methanol to a lower % of nitro ie 10/15%. The point being, no main jet or high speed change is suggested. The Question is with a Carb. When running a Methanol Carb that is well tuned [I know-why run a carb] and then adding the same low % of nitro,Why is a JET Change required? ie larger jet for more fuel delivery?

bigaldart:
With regard to a carburetor requiring a jet change you need to remember the sheer weight of Nitro compared to alky. Your fuel is fed into the engine by a pressure differential between the booster and atmospheric pressure, this does not change because the fuel changes therefore you need to increase jet size to get the correct volume of fuel. All that fuel has inertia and Nitro has more inertia than methanol is another way of looking at it.

Alan

wideopen231:
What are the carb things you fellas speak of?

ricardo1967:
My dr. says carbs are bad!!  ;D

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