Moderated Discussion Areas
ContinuousWave: Whaler Performance
posted 08-29-2002 05:21 PM ET (US)
What does blueprinting do to a lower end or a powerhead?
posted 08-29-2002 07:30 PM ET (US)
Drains any excess cash from the owner.
(Another Bigshot style comment from Taylor. Uh oh.)
I've never heard of this in boats, but in cars blueprinting is a way of getting more horsepower/speed/torque from an engine by making sure that each piece is in exact spec. In short, its a complete rebuild done to the highest levels of quality control.
For instance, if you rebuild a the lower end of an engine you have the crankshaft reground to .002 under or something, and then you just fit a thicker bearing, trusting that the fit will be good enough.
A more exact way to do it would be to have the journal and bearing worked together, make sure they match exactly and then shim for an perfect fit. If the fit is perfect, you can ask the engine to spin faster, and you can expect it to stand up to the pounding of higher compression.
posted 08-29-2002 08:47 PM ET (US)
My dad had his check mate buleprinted.
I have no clue what it does. But do not think that you can do it to outboards.
I will ask him what's up with it.
posted 08-29-2002 09:20 PM ET (US)
Does "blue printing" derive from the notion of building the engine according to the specifications, i.e., the blue prints?
Or does it derive from some sort of blue substance used to mark the clearance of close tolerance assemblies?
posted 08-29-2002 09:53 PM ET (US)
Blueprinting and outboard is rally only beneficial if you want to run at extremely high RPM. It consists of weighing each piston and rod and matching the weight of each component. Then the crank with pistons attached is dynamically spin balanced. The Cylinder bores and crank journals are line bored with the block bolted into a fixture and torqued to the same spec as the heads would be if attached. High quality needle bearings are fitted, and usually the flywheel is lightened. Such a motor will turn upwards of 14000 rpm and generate a lot of horsepower in the process.
posted 08-29-2002 10:40 PM ET (US)
Blueprinting only buys you alot for a motor that will be pushed hard and spun very fast. Typically, blueprinting is only done on race engines.
A more worthwhile process for everyday engines is balancing. A balanced motor will last longer than if it was not balanced. Most good automotive rebuilders will balance the components before assembling the engine. Of course, all race engines must be balanced because of the rpms that they turn.
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