What does Blueprinting an engine mean? - Ford Mustang Forum
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post #1 of 26 (permalink) Old 09-15-2009 Thread Starter
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What does Blueprinting an engine mean?

Heard it a few times and wanted to know what it meant to blueprint the motor. Thanks

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post #2 of 26 (permalink) Old 09-15-2009
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Heard it a few times and wanted to know what it meant to blueprint the motor. Thanks
Balancing & Blueprinting is nothing more than machining different engine parts to specific tolerances.

Balancing

To balance a V-8 engine requires 50% of reciprocating weight plus 100% of rotating weight, for a V-8 engine.

Reciprocating weight: Piston (1), rings (1 set), wrist pin (1), and small end of connecting rod (1).

Rotating weight: Big end of connecting rod, rod bolts & nuts, rod bearings, & oil supply to crankshaft bearings. Because there are two rods to each jounal then the rotating weight is x 2.

The pistons are all machined to weigh the same. The big end of connecting rods and small end of connecting rod are machined to weight the same (separately). Then the weights of the pistons, big end of connecting rods, small end of connecting rod, one set of rod bearings, one set of rings, one wrist pins and oil weight (usually 6 grams) is recorded and the bob weights are made up from the formula for the type of crankshaft being balanced. Then the bob weights (4 for a V8), dampener, flywheel (flex plate) are bolted to the crankshaft and spun to balance the left side and the right side of the crankshaft. Then spun with the left side and right side coupled together to make sure the crankshaft is still in balance.
The crankshaft is either welded on the counter weights (or heavy metal installed) or drilled on the counter weights (left and right) to bring the crankshaft into balance.


Blueprinting
To blueprint an engine consists of several machine shop operations including but not limited to:
Bore & hone cylinders (usually w/Deck plates) and honed to the correct clearance.
Line bore or line hone the main housing bore in the block. (Or at least check to see if the housing bore is within the correct specificaions).
Re-size connecting rods (big end & sometimes small end).
Turn & index crankshaft.
3 angle valve job cylinder heads (to a specific width & place on valve face).
Fitting valve guides to a specific clearance.
Setting up valve springs to the right installed height & pressure, both open & closed.
Surfacing block and cylinder heads straight & with the right RMS finish.
Race engines require even more blueprinting----such as; cc'ing heads, machining for exact deck, block clearancing for crankshaft, & cam to rod clearance, porting & polishing, shot peening, heat treating,---the list goes on & on.
post #3 of 26 (permalink) Old 09-15-2009
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basically in average terms it makes your engine run smoother and better. it costs quite a bit but when your building a car that you want lots of power from its the way to go while you have it tore apart to bore, stroke, or just rebuild. my brother in law had a dodge dart that had the engine balanced and blueprinted and it was a quick car. i'll have to ask him what all else he had done to it but he traded it for a big boat about 4 years ago. he misses it alot now haha.
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post #4 of 26 (permalink) Old 09-15-2009
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WOW Reggie! I don't think anyone could have explained it better!:hihi:

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post #5 of 26 (permalink) Old 09-15-2009 Thread Starter
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Reg sits there waiting for the perfect opportunity to post his notes lol.

Thanks Reg

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post #6 of 26 (permalink) Old 09-15-2009
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what about me putting it in basic terms? dont i get a silver star at least? haha
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post #7 of 26 (permalink) Old 09-15-2009 Thread Starter
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I hereby award thee this Silver Medal
for you wonderful efforts and hard work explaining the basic definition of "Blueprinting An Engine"

Congratulations!!!
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"Don't chase your dreams.....
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1988 5.0 GT - H/C/I and some other goodies Sold =(

1989 LX 2.3 - Flowmaster muffler, American Racing Wheels Sold I am mustangless
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post #8 of 26 (permalink) Old 09-15-2009
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REAL Meticulous Blueprinters will log all the bearing clearances, bolt torque specs used throughout the motor, ring gap, Rod and Piston gram weight etc.. then present them to the new owner which I think is impressive!!

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post #9 of 26 (permalink) Old 09-15-2009
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REAL Meticulous Blueprinters will log all the bearing clearances, bolt torque specs used throughout the motor, ring gap, Rod and Piston gram weight etc.. then present them to the new owner which I think is impressive!!
Ergo the expense involved for the service.......
post #10 of 26 (permalink) Old 09-15-2009 Thread Starter
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So how much would this cost? Just a VERY rough guess

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So how much would this cost? Just a VERY rough guess
on my motor the B & B was $750.00

but prices will vary depending on who does it & wear......
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WOW Reggie! I don't think anyone could have explained it better!:hihi:

Mr. Encyclopedia!

I know right! that's why i can't be content to the answer I get on all my questions here untill I read his responses!

THX Regg..I/we really appreciate your inputs.. hats off for you man!

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When I had my motor done about a year ago, I ended up paying between $700-$800 to have the block bored and inspected (no additional work was necessary), the crankshaft ground .010" undersize and polished, and finally to have the rotating assembly balanced. The rest of the work (checking clearences, ring gaps, spring pressures, etc, i did myself, it's not hard)

By far the most expensive part was the balancing, which due to the added weight of aftermarket rods and pistons on the stock crank, required a lot of mallory metal and set me back about $430. But they even zero balanced the pressure plate for me.

If it's not broke, you're not trying hard enough.

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Question

Anybody ever see a video of an engine running and had like a nickel laid on it's side and not get shaken off because the engine ran so smoothly? Any such engine??

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I'm not sure that even a stock honda could pull that off

If it's not broke, you're not trying hard enough.

1983 Mustang GT T-Top.

New T5 installed, driving my 'Stang again.
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