After research the following engine nominations were received and are displayed in order of suggestion. I'm afraid polls are limited to 10 so the following have had to be removed (sorry)
912 Porsche 917 (NA Flat 12), Any 7.0l Nascar (NA V8) (Might I suggest using the corvette?), VWAG 1.8T 20V Golf etc...(T Straight 4), N5F Escort Cosworth (T Inline 4).
Might I suggest adding the 4 cylinder engines to the 4 cylinder engine thread?
Key;
NA = Normal Aspiration, TT = Twin Turbos, S = Supercharged, T = Turbocharged
Thankyou all for your suggestions.