Motorsport infobox 

OK, I agree with what you are saying. If the information is available then it should be added. However, when I went to add the template to British Formula One Series, I couldn't find any data about any teams in the series. I know which drivers ran which cars, but not the teams that were running them. I suppose I could add a question mark or something like that for those fields. I can add constructor and engine info, but I'm not sure how relevant it is, being as most of the cars were second hand.

I realise making the change to the template was a bit bold on my part, without considering why those fields might have been left. You are welcome to revert the changes back.