What would the lifespan of the engine be (in miles) if FI was added...?

'04 Brilliant Silver G35 coupe 6MT Fully Loaded /w Navigation

 

Generally supercharger bearings and rotors last more than 3 years between rebuilds. But you don't see 70,000 mile engine warranty on any.
http://www.superchargersonline.com/repair/
Budget about $1000 and 2-3 weeks[every 3-4 years] turn around but you pay air both ways. Always good to keep a working spare on hand.

Obviously axial [Eaton/roots/Autorotor] will be more stressful on the engine as their turning HP requirements are greater and come in earlier.

I know the question was about engines but who knows depends on the average ON BOOST hours/ minutes/ seconds per day week month year.

A good rule might be 120,000 miles vs 240,000 miles for light duty use. The boost will deform the ring landings in pistons. Failure other than head gaskets will probably be the rod bolts and rod bearings.

One really needs to redesign and strengthen things to achieve high mileage if you use boost more than a few times per week [in 300 miles].
Important to measure compression/leakdown quarterly to catch any ring damage early.

 

Q45Tech,
In aviation we do compression tests by pumping 80 psi into each cylinder and measuring what remains. I do this at every oil change (50 hours or 4 months). Anything over 70 psi is considered good, although the manufactuers claim the cylinder is good until the low 60s no one I know flying waits that long before replacing a jug. By listening to where the air comes out one can tell where the problem lies.

Question is, what is the method used in automotive to test compression and what are some good rules of thumb to keep in mind when making an anlysis of the results? How often should a conscientious owner perform one?

2004.5 Coupe/5AT/Ivory/Everything but front spoiler/Nismo CAI/Crawford V5