Back in 2006/7 I built a road legal Caterham 7 with a hayabusa engine and after going through a long process I got it through the SVA and had it road registered. I think I must have driven less than 100 miles on the road before I started to take part in local sprints and hill-climbs. After moving from the ACB10s to slicks and removing all extra road kit it became a pure race car only machine and went through extensive development over about 5 years. I've now moved on to a single seater for my racing but can't let go of my seven and so it has been sitting in the garage. With the COVID lockdown I've had some extra time to spend in the garage and have decided to convert my car back to a road car. First mod I have made is to the inlet which has involved moving to curved air inlet trumpets to reduce the overall height. I think I can get about 80 mm clearance under the dry sump now without cutting a hole in the bonnet. But I do need to change my tyres from the cross-ply slicks I currently have to radial road tyres to check. 2 questions I haven't really been able to find clear answers from searching Blatchat: 1. What ground clearance do you really need under the sump, I've read about coke cans, 70 mm - 100mm is there anything definitive before I get my engine frame revised? 2. What is the latest recommended tyre for fast road / track summer only driving? It will be 13" on Mike Barmby wheels. What width wheels are currently run? I'm sure I'll have many more questions as I proceed and will provide photo updates whenever I've got something interesting completed ;) Thanks for any help, Rob
