TECH WATCH Q

What is blueprint­ing?

Motorcycle News (UK) - - Garage -

Blueprint­ing used to be chap­ter one in the en­gine tuner’s hand­book. It is strip­ping an en­gine to its com­po­nents, then refining them to more closely match the orig­i­nal en­gine de­signer’s in­tent; ie re­mov­ing the in­evitable tol­er­ances and im­bal­ances in­tro­duced by vari­a­tions in man­u­fac­tur­ing and pro­duc­tion.

Blueprint­ing con­sists of three main ar­eas: if pis­tons, rods, crank, cams and any other re­cip­ro­cat­ing parts are ac­cu­rately bal­anced, less en­ergy is wasted through vi­bra­tion and bear­ings get an eas­ier time. Even with a fac­tory as­sem­bly check, pis­tons can vary in weight by a few grammes, rods can be out of true by a sim­i­lar amount and a crank can be any­thing up to

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