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Old 2nd September 2013, 12:01   #1
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Default Jeeps: Improve fuel-efficiency of the Hurricane & Go-Devil Engines?

This was the other idea I had for a sticky post. Since I see a revival of a lot of petrol-engines for jeeps, for some strange reason, I thought a post like this would go a long way in helping existing and potential owners make it atleast halfway financially worthwhile to own one of these legends.
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Old 2nd September 2013, 14:15   #2
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Default re: Jeeps: Improve fuel-efficiency of the Hurricane & Go-Devil Engines?

One idea I had was to advance the timing a bit. In those days, lead was used as a softener instead of higher octane. So fuel would be at best 87 octane. Now it is 91 octane and advancing the ignition timing might help compensate for that. Skimming the heads and reducing the bowl volume may have the same effect but would need much more care to ensure that the piston crown does not foul with the valves. I am not even sure if Jeep engines need valve-train hardening or lead additives to make them run smoothly and for many thousands of kilometers, or not.

Another idea would be to use the correct spark-plug range. A plug chart for NGK, ND, Bosch, and other equivalent plugs will go a long way in ensuring that owners of petrol jeeps use the correct spark-plugs. Note that NGK denotes a warmer plug with a smaller number (so an NGK 7 is a hotter plug than an NGK 9) and Bosch with a higher number (so a W5 is a colder plug than a W7).
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Old 2nd September 2013, 14:49   #3
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Default Re: Jeeps: Improve fuel-efficiency of the Hurricane & Go-Devil Engines?

Not specific to the Hurricanes, but this advice article has a load of fundamentals that might help
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Old 2nd September 2013, 21:08   #4
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Cool Re: Jeeps: Improve fuel-efficiency of the Hurricane & Go-Devil Engines?

@ vivekjayasheel

Check the following for your purpose if possible

## Exhaust back pressure arrangements & or combinations.

## Fresh Air bypass valve based on engine temperature

## Transistor based ignition , yet still retaining the points ( old trick people did when point ignition was common )

## Dual ventury carbs , the second opens at loads ( high throttle only )

## Return fuel lines from carbs. ( if they dont exist)

Sudarshan

Last edited by Sudarshan : 2nd September 2013 at 21:16.
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