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Author Topic:   gun drilled axles
justin
Member
posted June 14, 2003 11:03 AM
Anyone run these? Just wondering if they are worth the extra $$$ or should I stick with the solids? Getting ready to setup my 9" (non-floater) and was debating on which to buy. Thanks.

Justin

towmandan
Member
posted June 14, 2003 12:37 PM
Justin the light weight axles are another needle in the the hay stack of light weight parts. Do you have a light weight full spool? The reason I ask is most of us unfortunately have to run on a budget and I always try to get the most bang for my buck....So when Im looking at light weight parts from engine to diff. where can you shave the most weight for your money...I guess what Im trying to say since I dont know what all youve got is would the money go farther somewhere else?.....Towman

[This message has been edited by towmandan (edited June 14, 2003).]

66jj
Member
posted June 14, 2003 06:50 PM
if you have a lw spool and lw gear next thing to do would be axles.

rotating wt is what your dealing with, and the center of the axle isnt going to help much!!!

plus they do break, so I would want 2 sets if I bothered to order one set.

Jeff Joldersma

justin
Member
posted June 14, 2003 10:14 PM
Thanks for the input fellas. I thought that they would be kinda weak too. I don't have the money to buy 2 sets right now so I'll probably just get the solid axles just to be safe. Thanks for the help


outlawstock17
Member
posted June 15, 2003 09:19 AM
who makes gun drilled axles for a non-floater 9"? i've never seen any.


kip77
Member
posted June 15, 2003 01:54 PM
when we bought our car two years ago it had drilled axles. It is less weight, but in my opinion they are not worth what you pay for them. Both of those axles have broke since then. Now we just use solid axles. You want less rotating weight, but you need less wigth closer to the motor; flywheel, clutch, tranny, etc, etc. When you get all the way back to the axles you aren't gaining much with lighter axles. Plus, the closer to the center of rotating mass the less important the weight is.

Example:
light wheel versus heavier wheel:

light wheel is lighter but has more weight farther from the center of rotating mass.
heavier wheel has the weight closer to the center of rotating mass. This all means the heavier wheel will use up less HP to turn. So the only advantage to gun drilled axles is a little less unsprung weight. For our class it doesn't really make enough of a difference.

------------------
FASTEST WHITE BOY ON FOUR WHEELS...and sometimes none...


o5racer
Member
posted June 15, 2003 06:13 PM
Ok that last post made no sense. anytime you use lighter parts in the drive train you are reducing rotating weight, and it will help acceleration. one lightweight part by it self usually wont make enough difference to be noticed. but if you use several light parts it will help.


outlawstock17
Member
posted June 15, 2003 06:46 PM
agreed, i'll keep my lightweight wheels.


66jj
Member
posted June 15, 2003 08:24 PM
what hes saying is

some lw wheels are actually not lw in the right places, they just use a lighter center etc, thus you are not getting as much benefit as you believe..

the gundrilled axle is lightened in the centerline of the rotating axle, that is going to be the least effective place to lighten in order to reduce rotating mass. a smaller diameter solid axle would actually be a better way of reducing rotating mass.

ive never seen a solid aftermarket axle break. have seen lots of gundrilled break.

Jeff Joldersma

justin
Member
posted June 15, 2003 08:25 PM
I think both of you are correct. Even though the gun-drilled axles may still have a high moment of inertia (but still lower than the solid axles)I think that if you combine'em with a lw spool and gears it may make a noticable difference. Plus it will lower your unsprung weight, but probably a just a small amount. That's just my 2 cents. I guess what I'm concerned about is how strong they are and 66jj and kip77 answered that for me. I think I'll just stick with the solids. Thanks for all the input.

Justin

outlawstock17
Member
posted June 15, 2003 08:41 PM
66jj, most lightweight wheels use the same center as the heavy wheels. it's the rim shell that's lighter. .098" shell for the lightweight and .135" shell for the heavy wheels. that would make the lightweight wheels lighter in the RIGHT place. some of the spun super lightweight wheels use a .070" rim shell.


kip77
Member
posted June 16, 2003 09:21 PM
05racer: WASTING MONEY MAKES NO SENSE.
Lighter isn't always better, that was the point that I was making.

We arent running 2200 lb cars. Yes a gun-drilled axle will reduce unsprung weight, that is it. Do the math. You are not losing as much weight as you would think. And by putting drilled axles in a car that weighs as much as stock frame cars do you are asking for trouble. It doesn't take much of a bump to snap the light weight axles right off.

Also, if the track gets bumpy you can snap these axles very quick. A very choppy track caused a **** of a wreck a few weeks ago where I race. The car in front of me snapped an axle on a restart. I just happened to be at the wrong place at the wrong time. I am happy to say that we got the car back together, somewhat and managed to limp home with a 10th place finish.

btw: I used the wheel example (in my other post) as an example and that is all. Just to make it a little easier to understand.
thanks, kip

------------------
FASTEST WHITE BOY ON FOUR WHEELS...and sometimes none...

[This message has been edited by kip77 (edited June 16, 2003).]

[This message has been edited by kip77 (edited June 16, 2003).]

66jj
Member
posted June 16, 2003 09:41 PM
66jj, most lightweight wheels use the same center as the heavy wheels. it's the rim shell that's lighter. .098" shell for the lightweight and .135" shell for the heavy wheels. that would make the lightweight wheels lighter in the RIGHT place. some of the spun super lightweight wheels use a .070" rim shell.

OUTLAW17. THE KEY WORD IN YOUR RESPONSE IS MOST, SO I GUESS REALLY DO AGREE!!

I WAS HELPING CLARIFY A PREVIOUS POST. THERE HAVE BEEN MANY ARTICLES IN THE MAGS SAYING THE SAME EXACT THING.

IN OTHER WORDS YOU GET WHAT YOU PAY FOR.

I HAVE SOME UL BARTS 16 LBS AFTER I HAD THEM POWDER COATED 120.00 EACH 15X8 SPECIAL ORDER ONLY. THEY ARE THINNER EVERYWHERE THAN MY 19 LB BARTS.

JEFF JOLDERSMA

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