These caculators are from a motorcycle site. But they work for any internal combustion engine.
http://www.rbracing-rsr.com/waterinjection.html
http://www.rbracing-rsr.com/intercoolers.htm
http://www.rbracing-rsr.com/fuelinjectors.htm
http://www.rbracing-rsr.com/rsraic400.htm
http://www.rbracing-rsr.com/camshaft.html
http://www.rbracing-rsr.com/compression.htm
http://www.rbracing-rsr.com/runnertorquecalc.html
http://www.rbracing-rsr.com/compstaticcalc.html
http://www.rbracing-rsr.com/squishcalc1.html
http://www.rbracing-rsr.com/conversions.html
http://www.rbracing-rsr.com/waterinjection.html
http://www.rbracing-rsr.com/intercoolers.htm
http://www.rbracing-rsr.com/fuelinjectors.htm
http://www.rbracing-rsr.com/rsraic400.htm
http://www.rbracing-rsr.com/camshaft.html
http://www.rbracing-rsr.com/compression.htm
http://www.rbracing-rsr.com/runnertorquecalc.html
http://www.rbracing-rsr.com/compstaticcalc.html
http://www.rbracing-rsr.com/squishcalc1.html
http://www.rbracing-rsr.com/conversions.html