The Lotus Grand Tourers

I've used "UPOL Aluminium engine enamel" on the recommendation of a very well respected engine machining workshop who has used if for years. I hot washed the block, scrubbed it with detergent using rotary brushes on a drill, dried it and degreaser it with brake cleaner. No primer and sprayed it on t...

The impeller used in the 907 pumps had very few, short vanes. That may (??) also apply to the 912LC. The 910 Turbo and 912HC pumps use an impeller that has more, much longer vanes. That, plus a deeper scroll housing portion of the pump housing means the later pumps can move a lot more coolant for b...