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907 and 912 Engine

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The 912 is basically a linear development of the 907, so with the right bits it is possible to upgrade the 907.

Have a look at Lotusbits web site as they did have an article listing the upgrades available just using genuine Lotus parts from later models.

The main parts are : a long stroke crank, shorter pistons, cams with different timing and different ignition timing.

It's also possible to fit the later HC head to a 907.

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  • 1 month later...

With the new sump you may have to change the power steering pump. You don’t need to alter the carbs if you don’t want to but I think that Lotusbits now market a replacement jet set. I haven’t done this as my Carr runs pretty well on the old ones.

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