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914World.com _ 914World Garage _ Modified flywheel
Posted by: muddboy Jun 8 2006, 11:35 PM
was just mesing with one of the cnc machines at work today and came up with this:
any suggestions? I'm planing on tweeking it more. Its 13lbs now
Posted by: Aaron Cox Jun 8 2006, 11:36 PM
if you need a test dummy to run it....
im all yours 
looks super cool, functional and fun at the same time!
Posted by: Type 4 Unleashed Jun 9 2006, 12:00 AM
Here are some ideas:
<a href="http://photobucket.com" target="_blank"><img src="http://i71.photobucket.com/albums/i134/Type4Unleashed/Schwungrad32kggebohrt.jpg" border="0" alt="Photobucket - Video and Image Hosting"></a>
Posted by: muddboy Jun 9 2006, 11:50 PM
That looks like alot more than what I'm looking to do... but the pattern on the cutts looks intresting... I have 2 more used flywheels to test this out on. I will have to try writing a new program to do something like that
and Aaron something could be worked out????
Posted by: So.Cal.914 Jun 9 2006, 11:56 PM
i didn't think they could get any lighter than what I am running, I WAS WRONG.
Looks Good.
Posted by: LowGT Jun 10 2006, 12:02 AM
I'm curious, what do those 2 styles weigh?
Posted by: Mueller Jun 10 2006, 12:09 AM
nice.....Automotion used to sell flywheels cut in a similar fashion...I asked Rich @ High Performance House about them and he mentioned that the torque requirred to turn over a Type IV had a tendancy of breaking those modified flywheels...of course it could have been due to improper machining or not leaving a nice small radii.......let ArRoN run one and do some testing 
Posted by: McMark Jun 10 2006, 02:04 AM
Breaking them where? I'm curious.
Posted by: Mueller Jun 10 2006, 01:48 PM
Breaking them where? I'm curious.
the teeth portion "seperates"...I've never seen one break, but Rich sells a differently modified flywheel due to that happening I guess a few too many times...
Posted by: Aaron Cox Jun 10 2006, 01:50 PM
hey! i gotta swap to my short geared tranny soon... so i would be in a position to try one
Posted by: scottb Jun 10 2006, 01:55 PM
i am gonna be putting in a new motor/tranny soon if'n you need someone to run one.... i will even send you my old flywheel as i have a newly machined backup....
cheers!!!
Posted by: Cap'n Krusty Jun 10 2006, 01:56 PM
Interesting. However, removing weight from points near the center may make it lighter in terms of total weight, but weight removed there has little effect on the way it'll rev, and it weakens it considerably. That said, I've seen an old T4 Super Vee flywheel that looked suspiciously like chicken wire .................. Even the clutch mating surface was heavily drilled. The Cap'n
Posted by: Aaron Cox Jun 10 2006, 01:59 PM
weight further from axis of rotation makes biggest difference as krusty is saying
Posted by: TimT Jun 10 2006, 02:14 PM
906 flywheel & my 911 flywheel fwiw
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Posted by: anthony Jun 10 2006, 02:38 PM
That looks like alot more than what I'm looking to do... but the pattern on the cutts looks intresting... I have 2 more used flywheels to test this out on.
What about balancing the flywheel after all the drilling?
Posted by: smdubovsky Jun 10 2006, 02:43 PM
What about balancing the flywheel after all the drilling?
Its absolutely required after any machine work to any rotating assembly.
SMD
Posted by: Mark Henry Jun 10 2006, 03:13 PM
The Crusty one is right about weight removed from near centre...useless. Also never cut the backside of the friction surface.
You will need to beef up your valve train or you will float your valves like crazy. I don't recommend doing this on a daily driver, no inertia, you will be on/off the gas all the time.
With a light flywheel, if you do put it on a DD, you'll need the power to back it up.
Posted by: muddboy Jun 10 2006, 03:34 PM
The shop I am at can do the ballancing (and I'm planing on it for the test ones), and we are getting the wheel to grind the surface.
The Crusty one is right about weight removed from near centre...useless. Also never cut the backside of the friction surface.
You will need to beef up your valve train or you will float your valves like crazy. I don't recommend doing this on a daily driver, no inertia, you will be on/off the gas all the time.
With a light flywheel, if you do put it on a DD, you'll need the power to back it up.
I am trying to get a couple of profiles to cut to... I want to have 2 versions, a light and lighter. That first one is at 13lbs, and I dont want to be much lighter for this one... then I'll try to do one around 10 or so lbs.
Posted by: gregrobbins Jun 10 2006, 04:12 PM
I don't remeber where, but I read about someone testing different flywheel weights. They had one down to 9 lbs but it was a track only application as it reved too wierd for street use. They had one at 11 lbs that worked better on the street, but it too was tempermental. I recall they figured 14 lbs was a good all around solution.
Posted by: Mueller Jun 10 2006, 04:16 PM
is it only me that finds freshly machined parts sexy??? 
Posted by: KevinP Jun 10 2006, 04:28 PM
I don't think I would install a lightened flywheel with out doing the entire rotating mass balance. I think all should include crank,piston,pins, fan; ect... If your gonna use this on a DD I wouldn't go less than about 15 lbs. Whats the real benifit on running a lighten FW. I would think the quick revs only. Whats the down side? Float the valves on a missed shift. What about the loss of TQ and driveabilty. Just my 02 cent, but I like it when we go outside the box. Thats why I hang out around here!!!
You guys will never stop letting me learn- Thanks for that......
KP out
Posted by: muddboy Jun 10 2006, 05:08 PM
is it only me that finds freshly machined parts sexy???
um no.... why do you think I do it for a living
as far as weights... the 3 used ones i have are around 16.5 to 17lbs before I ran the program.
Posted by: muddboy Jul 11 2006, 10:20 PM
just an update I surfaced the test flywheel and I am going to Ballance it soon.
Posted by: Brett W Jul 12 2006, 01:29 AM
I machined mine back in the day down to 11 lbs and ran it on a daily basis with a Six puck solid hub disk. Made a grabby as hell clutch but if you learned to drive it and slip the clutch just a little it wasn't that big of a deal.
The one I made, I machined the normal wieght off the backside and then layed it face down on the bed of a mill. Then came in and carefully milled all of the area on either side of the dowel pins. I did this on four sides. All done without a rotary table. It was ugly but it worked well. Never had a problem.
Joe Ricard has it now. I think he was little ill that it was as ugly as it was, but it worked great.
You should be able to get it down to around 8lbs without too much work.
Posted by: Joe Ricard Jul 12 2006, 05:04 AM
is it only me that finds freshly machined parts sexy???
Nope.
Hey I got a extra flywheel if you want another one. Where do I send it?
Yes I have Brett's wheel. it's nice and actually pretty sexy. It will be going in my new Red Neck Racer motor.
Posted by: turboman808 Jul 12 2006, 05:45 AM
Wish I had machinery like that to use 
Posted by: Rog914 Jul 12 2006, 06:26 AM
Could it be possible to machine a 911 (225 mm) clutch & pressure plate to fit a 914 flywheel? For high HP engines.
Ralph
Posted by: brant Jul 12 2006, 08:06 AM
I just finally got my tranny pulled a week or so ago, and took out my old flywheel.
here she is, 10lbs:
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Posted by: Dad Roberts Jul 12 2006, 04:47 PM
I lightened my first VW flywheel on a disc brake lathe 
. Damn......that was a LONG time ago (68). Balancing? Hey, as an edumacated teenager, if you took the same amount off all the way around.....it's STILL balanced, right?? I put that puppy in a 58 Rag with a 63 40 horser. Hang on brother! Oh yea.....I agree with you Mikey, they are sexy 
. Sorry I missed ya last week Mikey...................Dad 
Posted by: Brando Jul 12 2006, 10:17 PM
I seem to now have 2 extra flywheels... any chance I can get some of this cool lightening done to at least one of them? 12.5->13lbs of course.
Posted by: muddboy Jul 13 2006, 07:46 PM
I just ran a newer program on the cnc today... came out at 12lbs. Yes I can get it lighter if you want. Looks like we will be charging 150 to lighten it, and 60 for the surface. Also if youre intrested found the parts to modify the flywheel to take a double clutch pack(pricey though).
I am looking to get extra flywheels(those of you who offered) so I can get them ready to trade out for ppl who want a fast turn around.
Posted by: brant Jul 13 2006, 10:02 PM
how much for the 6lb version:
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Posted by: Mueller Jul 14 2006, 04:09 AM
Also if youre intrested found the parts to modify the flywheel to take a double clutch pack(pricey though).
what is the friction material?
Posted by: Brando Jul 14 2006, 01:23 PM
$150 to lighten and balance? Shaweeeeet.
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