blueprinted engine
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Effectively one built to very exacting tolerances.
For example, ive just built a bottom end for a 450bhp Vauxhall engine, an example of the blueprinting ive done is i have decided on a piston to bore clearance of 3.5 thou, and thats EXACTLY (to within a tenth of a thou) what the clearance is on every single bore all the way up and in every direction, likewise all the weights of the rods and pistons are as exactly the same as i can measure down to.
So basically, it just means that you built it to an exact specification rather than within a wide tolerance like on a normal cheap and cheerful rebuild.
For example, ive just built a bottom end for a 450bhp Vauxhall engine, an example of the blueprinting ive done is i have decided on a piston to bore clearance of 3.5 thou, and thats EXACTLY (to within a tenth of a thou) what the clearance is on every single bore all the way up and in every direction, likewise all the weights of the rods and pistons are as exactly the same as i can measure down to.
So basically, it just means that you built it to an exact specification rather than within a wide tolerance like on a normal cheap and cheerful rebuild.
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cheers chip, what i thought 
but i have heard, on the grapevine like, that a loose cvh is better for power. if this is true, then why would people blueprint a cvh engine?
what differant machines etc than thouse found in your average engine rebuilding place are needed? Or is it down to the person using them?
but i have heard, on the grapevine like, that a loose cvh is better for power. if this is true, then why would people blueprint a cvh engine?
what differant machines etc than thouse found in your average engine rebuilding place are needed? Or is it down to the person using them?
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Originally Posted by andre_k
cheers chip, what i thought
but i have heard, on the grapevine like, that a loose cvh is better for power. if this is true, then why would people blueprint a cvh engine?
what differant machines etc than thouse found in your average engine rebuilding place are needed? Or is it down to the person using them?
but i have heard, on the grapevine like, that a loose cvh is better for power. if this is true, then why would people blueprint a cvh engine?
what differant machines etc than thouse found in your average engine rebuilding place are needed? Or is it down to the person using them?
1 thou of clearance on a big end? 1.5 on a main? 5 thou on piston to bore?
IF so, then blueprint an engine to exactly that clearance so its all perfectly loose by exactly the right amount
(those numbers are NOT of any relevance by the way, just total random examples)
No fancy tools are needed to build an engine properly, a basic boring bar and a honing bit on a drill is enough if its in the right hands and you have accurate measuring equipment, all fancy machines do is make it quicker to do the same thing really.
Ive got a mate who can hone to withing 1-2 tenths of a thou by hand with a drill, i also know machines shops who cant match that with any of their fancy automated honers, so its all down to who is doing it.
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