I am considering building a 2.1 long block with = some minor performance
enhancements such as ratio rockers, lightweight valve = train and
ceramic-coated heads and pistons, aircraft-grade head bolts and = some other
anti-leakage measures. I would install this 2.1 in place = of my 1.9 since I
am just over 150K on an untouched motor.
The question: How much can my stock 1.9 fuel = injection handle? What
improvements can I make before I need to = replace/upgrade my FI system? Am I
looking at larger injectors and or just a = fuel pressure regulator?

I have just completed a 2.1 = big valve conversion into my 1985 camper.The extra power has allowed me = to power up the hills of Vermont and New Hampshire

at 70 mph with no problem. I had five = people the dog and a 25 pound turkey with the fixings in the van at the time. = There was enough power left to increase my speed to 75 mph = and beyond.

The Digijet fuel injection system is not = what is limiting the available power. What does limit the power is the = ability of the engine to breathe and that darn rev limiter that's built into the = ECU. As a gear head I have spent allot of time pondering this truth. The = question then is how do you make the engine breathe without loosing = longevity and drivability. Using aftermarket camshafts with huge amounts of = duration and lots of lift. is an example of how to loose low end power and over = all drivability

My method of increasing power = threw out the power band was to add 3 MM larger valves, blending the valve seats = with a Serti style cutter and minor porting work. when I say minor I mean the = intake port where it meets the intake seat was made only .050 ths larger to match the new intake valve seat. With the aid of a flow = bench I was able to increase the air flow by 20% throughout the travel of the valve. (ratio rockers don't even come close to this) I have = posted the flow charts on my web page see the stage three engine and look = for the link. The other internal changes are a minor regrind of the OEM = cam, more spring pressure and increased clearance in the = cylinder to allow the piston to grow. =

The rest of my vans cooling system and fuel = injection is bone stock. I would not consider changing the heads studs from stock, = ceramic-coated heads and pistons or counterweighing the crank. Mr. = Lilley has never proven there value to me.