csmc711

iTrader: (4)

So, been armchair racing and I really cant think of anything, here is why

1) equalizes crank case pressures (rebuttal) plenty of holes around the lifter area

2) Less rotating mass (rebuttal) its in the center, how much can there be that would really affect anything?

3) Less weight (rebuttal) again, how much can (in this case, that matters) can there be?


So, what does this equal to in a daily driver? .001mpg? 1mpg, or more??

Someone, seriously, please clue me in, lol.

96capricemgr

iTrader: (1)

Please explain to me how a gun drilled crankshaft equalizes crankcase pressure?

Far as MPG, don't think so. It is about less mass to accelerate when WOT going through the gears. The engine has to go from say 600 to 6000 rpm then. Back down to say 4000 and back up to 6000 etc.

A.R. Shale Targa

iTrader: (2)

Apparently the rifle drilling on the camshaft is 2 pounds alone, likely closer to 3 pounds for the crankshaft. Yes it is close to the center of rotational mass however five total pounds is approximately 5-7 percent reduction of the total

ckpitt55

iTrader: (4)

leave in the beef. the less a crankshaft deflects the longer it lives.

KCS

iTrader: (20)

Which LS cranks aren't drilled?

csmc711

iTrader: (4)

Thanks for everyone's feedback on a silly question.

Thats kind of the direction I am thinking. So, it is obvious (before I posted) that less inertia to get moving/stopping is better, but, at how much of an advantage is it to a street car vs longevity/dependability? I am sure the engineers thought that it was viable enough in that the engine would blow after the warrantee, but, then again, is there enough advantage to add gun drilling to the $$ it takes to produce a crank? Maybe for LS1 bragging rights? I could see all out racing where a tenth or less is the diff between winning or losing your pink slip, but........


As far as I know, all of them except for the 5.7 ls1 in the camaro/firebird/corvettes, etc.


So, bottom line..... If I do a lot of street/traffic light driving, do you think I will notice a difference between the LS1 gun drilled verses a solid crank? Need to figure out what to get/put in the LS2

v8pwr

iTrader: (19)

You will not notice any difference if you address lubrication as a complete system instead of just a pump. If you just throw something together you still probably won't notice anything. Windage is a real issue and GM tried different solutions including gun drilled cranks & holes in the bulkheads. I think that all of the performance car cranks were gun drilled while the trucks were not. The mass at the center does very little for strength but does help a little with weight.

squalor

iTrader: (3)

Have you heard of the old trick of stuffing bread or something in the end of the crank to "hydraulic" a pilot bearing out ? Someone must have tried that to the Ls1 I bought. The plug in the end of my crank was cocked slightly to the side. Oil from the crankcase ruined my LS6 clutch.