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Weight comparison of Flywheels

Discussion in 'Rootes Racing' started by jdoclogan, Nov 13, 2020.

  1. jdoclogan

    jdoclogan Platinum Level Sponsor

    I'm becoming more familiar with the Roy Stetina race car I acquired from Max Phameier's estate. I received a wonderful response from Wayne Stetina, the son of Roy Stetina, as I inquired about any knowledge he might have of his fathers SCCA racing Alpine. Besides knowing the car number (21) he shared a notable piece of information about the flywheel. Apparently it had been lightened with some serious metal removal (unlike the Le Mans lightening). As I have #21 in my shop now and have the Stetina flywheel I couldn't help but do a bench comparison of an OEM vs Stetina vs TTV Racing flywheels.

    upload_2020-11-13_14-35-59.png upload_2020-11-13_14-36-37.png
    upload_2020-11-13_14-37-12.png upload_2020-11-13_14-37-34.png

    Weights:
    OEM = 23 lbs
    #21 lightened = 13.5 lbs
    TTV lightened = 8.59 lbs

    That is amazing to machine another 5.5 lbs off a lightened Le Mans flywheel that weighed 19 lbs.
     
  2. DanR

    DanR Diamond Level Sponsor

    Sure made it lighter:)

    Hope there is no warping or NEVER a need of a scatter shield.

    Question: How could you resurface if ever the face had some even minor damage? Is there a steel insert?
     
  3. spmdr

    spmdr Donation Time

    It looks like the #21 Lightened FW has taken liberties on the original dimensions?

    A bit of Apples to oranges?

    ...what ever works.
     
  4. jdoclogan

    jdoclogan Platinum Level Sponsor

    Dan, I agree very serious liberties. It won't be going into any rebuild I do.
     
  5. GlennB

    GlennB Silver Level Sponsor

    So it's a co-incidence that I am preparing a new race engine for my HLM and have taken a stock flywheel down to 16 lbs. Potentially some further weight could have gone but I am using an 8 1/2" clutch and it didn't look like there was any meat left on the outside/periphery as suggested in Chris McGovern's book - pp156. I didn't give a specific target weight to the shop, just asked for a reasonable lightening with road-going capability. The shop kept going until they started to break into the cover bolt holes and said that it was a sensible result. Most of the weight came from the inside as per the photo plus a light surface face skim. I'm using a diaphragm cover at 10.5 lbs instead of the spring cover at 11 lbs 4 oz. I'm not expecting miracles, more interested and hoping ....

    I won't know the weight of the flywheel in the car at the moment until I take that engine out. I think the Le Mans original has long since departed but my engine builder told me it was lightened but not by how much.
     

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