 Flywheel Lightening |
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| groot |
 May 20 2004, 08:54 AM
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#1
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Dis member  Group: Members Posts: 896 Joined: 17-December 03 From: Michigan Member No.: 1,444  |
I didn't format the pictures properly to post them here, but here's a link to check out.
The first pic is a "normal" flywheel and the 2nd is what I found when I separated my trans from my engine. I knew it was lightened, but holy sh#@! http://home.wideopenwest.com/~kgroot/ The other pics are me trying to decide whether to go with a low front hoop or a high front hoop. Due to visibility, I'm going with a high front hoop cage. |
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Replies(1 - 10)
| tat2dphreak |
May 20 2004, 09:11 AM
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#2
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stoya, stoya, stoya Group: Benefactors Posts: 8,797 Joined: 6-June 03 From: Wylie, TX Member No.: 792 Region Association: Southwest Region  |
DUDE, that thing is scary! that can't be enough metal there to stay safe!
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| skline |
May 20 2004, 09:17 AM
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#3
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Born to Drive Group: Members Posts: 7,910 Joined: 26-December 02 From: Costa Mesa, CA Member No.: 17 Region Association: Southern California |
The first 914 I had I built a 2056 and had the flywheel lightened to 11 pounds. It was running 45 Dells with a Web 86B cam and lifters, It revved so quick that the front fan and hub spun right off the crank several times till it finally ruined the crank. I guess that is why Rimco wont go less than 14 pounds now. You cant lighten the fan.
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| groot |
May 20 2004, 09:34 AM
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#4
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Dis member Group: Members Posts: 896 Joined: 17-December 03 From: Michigan Member No.: 1,444 |
I drove it that way for quite a while. My uncle put the car together in San Fran. I drove it to LA in '99 and drove it regularly there, then moved it to MI. It drove out to LA from MI and then was shipped back here, where I auto-xed it often. No problems with the flywheel... or bearings.
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| machina |
May 20 2004, 09:40 AM
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#5
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Advanced Member Group: Benefactors Posts: 2,030 Joined: 21-June 03 From: Miami Beach, FL Member No.: 848 |
QUOTE(skline @ May 20 2004, 11:17 AM) You cant lighten the fan. don't tell paul that. dr Attached image(s) 
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| MattR |
May 20 2004, 09:58 AM
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#6
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Advanced Member Group: Members Posts: 3,279 Joined: 23-January 04 From: SF Bay Area Member No.: 1,589 Region Association: Northern California |
QUOTE(skline @ May 20 2004, 07:17 AM) ...I guess that is why Rimco wont go less than 14 pounds now... Rimco suggested I go with 12 pounds last week! (IMG:style_emoticons/default/ohmy.gif) I have a 12 pound flywheel now. I guess I have to go easy on the revs. |
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| Mueller |
May 20 2004, 10:34 AM
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#7
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None 
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QUOTE DUDE, that thing is scary! that can't be enough metal there to stay safe! that is where you want to remove the weight...the problem is not whether or not it's going to scatter at while at 5000 rpm, the issues are that they tend to break while trying to start the engine due the compression of the engine....a few options to make starting easier would be to have a valve that opened to reduce the compression while starting or you have an electronic device to change the timming so that the motor starts easier (an engine would start easier if fired @ 5° ATDC than 5° BTDC) |
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| TimT |
May 20 2004, 02:03 PM
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#8
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retired Group: Members Posts: 4,033 Joined: 18-February 03 From: Wantagh, NY Member No.: 313 |
I wouldnt worry to much about that flywheel... if its survived as long as it has it should be fine..
Heres how the factory lightened the cup type flywheel.. Attached image(s) 
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| TimT |
May 20 2004, 02:05 PM
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#9
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retired Group: Members Posts: 4,033 Joined: 18-February 03 From: Wantagh, NY Member No.: 313 |
this is how I lightened the disc flywheel for my 911
Attached image(s) 
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| URY914 |
May 20 2004, 02:17 PM
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#10
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I built the lightest 914 in the history of mankind. Group: Members Posts: 120,983 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
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| Jake Raby |
May 20 2004, 05:17 PM
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#11
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
12 pounds is my standard... I have gone to 8, and one to 6!!
If you were losing front hubs, the hub had a bad morse taper! |
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