lightweight gears Options

[T H O M A S]

inspired by a recent threat here about lightning gears and there benefits ,i decided to give it a shoot and wire edm 1st and 2nd gear .the weight difference form stock to modified is
3rd gear .3764kg ( the lightest gear to slow down for shifting)
2nd gear was .5078kg is now .4398kg
1st gear was .6754kg is now .5468kg
gears have bin cryo treated after the machining
for testing the transmission will be mated to a 200hp /4 engine
i let everybody know if the gears survive and if it makes a difference in shifting

[turboman808]

I hope it works well. I am really interested in how the light weight gears perform as well.

I got the impression that the main advantage was better synchronization. Any other benefits?

[Ferg]

Cool!

BTW you sound normal when you type. (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/bye1.gif)

[jaxdream]

Wouldn't the holes / shapes promote a little more cooling ??

Jaxdream

[T H O M A S]

thanks ferg
better cooling,i don't think so,holes will be covered by the dogteeth

[Elliot Cannon]

Cool!

BTW you sound normal when you type. (IMG:style_emoticons/default/biggrin.gif) (IMG:style_emoticons/default/bye1.gif)

Naaah. He STILL sounds German. (IMG:style_emoticons/default/lol-2.gif)

[jimtab]

You guys quit picking on Thomas about his "Moder"....... (IMG:style_emoticons/default/poke.gif) HI T. (IMG:style_emoticons/default/rolleyes.gif)

[SirAndy]

You guys quit picking on Thomas about his "Moder".......

And you wish you had his "Moder" ...
(IMG:style_emoticons/default/happy11.gif) Andy

[sean_v8_914]

less mass to accelerate and less torque needed to change its state. I think its the sickest of the sick! I would be willing to gamble that it's worth several tenths off the clock...and since it is also less mass to decelerate, I speculate it to wear less on teh synhcros. EDM is great for that.. nice radiuses

[ME733]

(IMG:style_emoticons/default/popcorn[1].gif) Well looks to me like a fools paridise.You have just increased the number of places for stress cracks, (and failure) to occur by a zillion fold. You did mention cyro treating the gears, but what about , actually rehardning the gears, as they surely lost their surface hardness from EDM cutting.,and with all those holes, keeping the gears from distorting(even a little)..is going to be impossable...Need to have a gear run in machine like the factory does, to get the proper mesh for that SET of gears....This is why Gears are made in SETS, and numbered,.thats why mixing gears ,with the same ratio, is not a good Idea...and generally results in noise from that gearset..(for a while, if not forever)..OK you have a race car.You won't hear the noise., but you have a handgrenade waiting to go off., in my opinion. (IMG:style_emoticons/default/popcorn[1].gif)

[proto31]

(IMG:style_emoticons/default/popcorn[1].gif) Well looks to me like a fools paridise.You have just increased the number of places for stress cracks, (and failure) to occur by a zillion fold. You did mention cyro treating the gears, but what about , actually rehardning the gears, as they surely lost their surface hardness from EDM cutting.,and with all those holes, keeping the gears from distorting(even a little)..is going to be impossable...Need to have a gear run in machine like the factory does, to get the proper mesh for that SET of gears....This is why Gears are made in SETS, and numbered,.thats why mixing gears ,with the same ratio, is not a good Idea...and generally results in noise from that gearset..(for a while, if not forever)..OK you have a race car.You won't hear the noise., but you have a handgrenade waiting to go off., in my opinion. (IMG:style_emoticons/default/popcorn[1].gif)

You seem very skeptical... It appears that the original hardening was only effected at the actual cut points, cryo treating the entire gear provides similar hardening characteristics and seems overkill, these gears aren't going to be behind a 400 hp V8. I hardly think that these gears distort during usage, the centrifugal forces are null and any power torque forces are released as the gear spins. I think it's a cool idea, let's see what happens once it get's reinstalled in the the same car it came out of, a good control for comparison.

[aircooledtechguy]

I'm interested to see how this works out and if there are noticeable differences in how the car drives and shifts. I don't currently have any use for this type of modification, but it sure is interesting none the less.

Having spent 2 decades as an NDT for military aircraft, I've seen my fair share of cracked parts and the modifications needed to stop them. I can surely appreciate the concerns brought up by ME733 as to the addition of lots of stress risers. It looks as though the ID of the cuts were well radiused to the eye but is doesn't appear as though the top and bottom where the cuts transition to the face of the gear have any radius; it looks like a bit of a knife edge transition. Having a radius on all transitions will help it be less crack-prone during use. Also shot peening prior to final heat treating (or cryo in this instance) will relieve stresses that EDMing and other machining induce into the gears.

A a rule, cracks almost always originate in a corner or on a knife edge be it in the shape of the part or from a stray machining mark

[Rand]

Hard to tell in the original photo, but brightening it up and zooming in, looks to me like everything has a radius.

The proof will be in the pudding. I'm glad to see this is being tested in the real world. In time we won't have to speculate.

[r_towle]

Thomas,

Do you plan to run it for a few events and then pull it apart to see how it worked out, or are you planning (like me) to run it till it breaks, then figure it out.

Rich

[T H O M A S]

we will run it till it breaks or needs new syncros,wire edm is done under water so there is no head buildup,cryo treating strengthened the gear by 50-60%,
i talked to one of our customers ,a gear maker (action gear in costa mesa)and he sad, no problem with 200hp,well, will see

[J P Stein]

,cryo treating strengthened the gear by 50-60%,

You have data to prove that?

The fella that talked of radii & shot peening has made the most sense to me.....
Of course I'm another aircraft guy.

[T H O M A S]

well jake raby uses it for years and so do a lot of other engine builders,http://www.nitrofreeze.com/cryogenic_treatment.html?gclid=CMmY1ZORrpwCFRxNagodJj2Sjw

[ghuff]

well jake raby uses it for years and so do a lot of other engine builders,http://www.nitrofreeze.com/cryogenic_treatment.html?gclid=CMmY1ZORrpwCFRxNagodJj2Sjw

Basically it is my understanding that NASA first noticed that when bringing stuff back from space the composition of the metal had changed.

Temperature in space is approximately 2.725 Kelvin. That’s almost -270 degrees Celsius, or -455 Fahrenheit


From the internet.

http://www.finishing.com/340/78.shtml

[Elliot Cannon]

Good job THOMAS. It's great to see someone trying something new. (IMG:style_emoticons/default/smilie_pokal.gif)

[Elliot Cannon]

well jake raby uses it for years and so do a lot of other engine builders,http://www.nitrofreeze.com/cryogenic_treatment.html?gclid=CMmY1ZORrpwCFRxNagodJj2Sjw

Basically it is my understanding that NASA first noticed that when bringing stuff back from space the composition of the metal had changed.

Temperature in space is approximately 2.725 Kelvin. That’s almost -270 degrees Celsius, or -455 Fahrenheit


From the internet.

http://www.finishing.com/340/78.shtml

I don't think THOMAS' car will spend much time in outer space. (IMG:style_emoticons/default/lol-2.gif)