Driftster

Blueprinting pretty much means tuning the engine...

matching the optimal fuel output to the proper RPM to make maximum power throughout the powerband..

Car Before turning
4000rpm60hp
5000rpm70hp

car after tuning
4000rpm67hp
5000rpm79hp

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R.I.P. Randy

parko1990

Isn't that what you'd buy, for example, an Apexi power FC for?

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"Men with guts attack those corners!" ~ Keiichi Tsuchiya

Driftster

Sorta....That does specified tuning though..Blue printing is EVERYTHING..everything that can be "adjusted" is taken into consideration...


Fuel pressure...

lbs per hour....

throttle position..
boost pressure..

valve timing engagement..
etc

__________________
R.I.P. Randy

parko1990

Cool, thanks heaps.

__________________
"Men with guts attack those corners!" ~ Keiichi Tsuchiya

jimkk29

I think it's something like achieving perfect weight balance between every single part of the engine... dunno how to say it.

slowfiveoh

Um thats not blueprinting drifster thats "tuning". Blueprinting means that the entire rotating assembly is precision matched and drawn up to perfect scale as much as is mechanically possible. This means the extreme particulars of the engine are all annotated and blueprinted for further review if complications occur or upgrades are needed. By specifically mapping every engine component you make it far easier to determine any issues with the engine. One of the most common things you will see a machinist shop do simply because it is particularly part of the blueprinting process is balance all balanceable components. Why blueprint a stock motor? You CAN blueprint things like injectors. Meaning that the build is so particularly refined that in order to replicate that components performance careful precision components must be reinstalled, and by having a blueprint you have a gauge with which to do this. Lets say you know for sure that each bearing has .001 inch of tolerance when new. By accepting this as THE acceptable level for performance and lifespan you know that once you reach .002 you are well outside acceptable limits on your build and that it is time to replace it with a specific, lets say Clevite bearing for your custom crank that absolutely would not operate with a stock main bearing. Look at your blueprint for the exact part number, width, height, and any machine work done on the main bearings or crank journals. Do you understand now?

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The 305 was a severe POS... Especially next to the Ford 302. -- monkeyfkker

parko1990

Thanks, Slowfiveoh.

__________________
"Men with guts attack those corners!" ~ Keiichi Tsuchiya

Driftster

I was thinking about giving the entire engine balance from the ground up build schpiel....
but....i didn't wanna type..

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R.I.P. Randy

SteveFX

I am lazy and a slow typist, but I doubt Driftster's excuse.

In the US, a "rebuilt engine" means that bearing and piston/cylinder clearances will be within max allowable overhaul range. A "remanufactured engine" will be within max clearances for brand new engines. A "blueprinted" engine will have every bearing and piston/cylinder clearance equal. This clearance may be larger than minimum factory figures if experience/testing/mods show a power increase.

I once worked with a guy who, with his twin brothers, drag raced 350 Chevy Novas with 150-200 shots of Nitrous. His idea of a matched set of rods was having 8 with matching casting numbers. He was adamant about having loose exhaust valve guide clearances with no oil seal. He didn't care about burning a little oil; he wanted to be sure that his exhaust valves, which get very hot when you use juice, would not stick.

They were scoffed at (by people with big $$$ spent for somebody else to build an engine) because their engines broke (usually a holed piston). So what. They would salvage some rods, the block, and maybe the crank and build another motor. These guys would buy a $200 set of pistons, a gasket set, refill the bottle, and race next weekend. They often beat the guys with big bucks.

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monkey's Camaro went faster because of the howling pack of starving stray dogs behind it.