Why SFI Approved Flywheels and Flex-plates are a good idea to have in your boat: - Reply to Topic

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Topic Review (Newest First)

  • 09-16-2009, 05:08 PM
    gn7


    [/QUOTE]

    There is so much wrong with these plates, it amazes me that anybody even makes them. First, they are punched. Anything that is punched, has a radiused side and a sharp side. The sharp side is nothing more than a "crack start here". Then they punch "lightening holes" in them as if they are so damn heavy. How much wait are they saving here? This puts a sharp edge within about a 1/2" of the second problem on these piles of chit, the punched offset center. Now the crack starts at the sharp edge of a "weight reduction hole" travels to the center, with its "follow the weak ass crease" These plates, all of them, B&M, TCI, Pioneer, Wangs, Changs, all of them should be outlawed. Billet alumn flywheels are only marginally better with their straight, one direction grain pattern. I've '60s M/T, Shaffer, Weber etc. that are forged from wrought alumn and rib reinforced on the back, with a jillion hrs on them and they are perfect, and new punched from plate "billet" ones with the center torn right out in 2 seasons. Billet is not always better, just cheaper.



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  • 09-16-2009, 04:43 PM
    gn7


    Paul[/QUOTE]

    Quote Originally Posted by nOv1c3 View Post
    Had no clutch in it so no real load on it , Maybe the bolts sheard ? Or maybe it already had heat cracks
    You don't need a load to have one of these fly apart. In fact a load I.E. a converter actually helps kill the harmonics that fails these POS. There was never any load on the plate in the above pic. Your right about the bolts though. There is nothing left of the flex plate on the crank and no bolt heads, nothing, those pics. Where is the PTO for the dyno. Whos bolts?, the dyno shops? If so, I'd more than a little pissed. If the plate above would have failed, at least the center would still be bolted to the crank. Maybe Ace hardware bolts



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  • 09-16-2009, 10:42 AM
    nOv1c3
    Quote Originally Posted by havasubyou View Post
    guess this is getting off track a little but as you can see in the pics of this engine carnage it was a std trans flywheel on this engine on the dyno, look down at pic 5
    http://www.460ford.com/forum/showthread.php?t=138991

    I never paid any attention, but your right lol

    Looks like a 2 peace but still that thing should have been able to handle 6500 rpm , Had no clutch in it so no real load on it , Maybe the bolts sheard ? Or maybe it already had heat cracks
  • 09-15-2009, 05:25 PM
    gn7
    One of the things often over looked with these things is that the crankshaft harmonics are traveling out the ends of the crankshaft and that flex plate is trying to ring like a bell. Its a little better on a jet, or even a v-drive running off the flywheel, although only slightly. On a v-drive running off the snout, the flywheel is in pure hell, with the harmonics having nowhere to go but out. Aside from an alumn wheel, the JW "WHEEL" holds up by far the best.



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  • 09-15-2009, 10:31 AM
    fc-Pilot
    Quote Originally Posted by havasubyou View Post
    sorry no weight on rear of bbc crankshaft the line you see is false,crank flange does not extend past ring, pioneer brand, made in USA. sfi. and .140 thick..
    have some other sfi flexplates one is a tci and it also has the ring (step flange) and a thickness of .160
    and last a scat also has the same (stepped flange) with a thickness of .140

    i will give pioneer one thing they at least stamped where it was made. the tci and the scat does not.
    as far as (SFI) is a joke.some of the harmonic balancers that carry the sfi flag are just just some proof.
    O.K. thanks for the info. I was just trying to go off of what my eyes saw. We had run that style of flexplate in our drag cars and always had issues after a little while. We switched to the JW brand which is a solid piece that is not pressed and never had another issue.

    Paul
  • 09-15-2009, 08:24 AM
    havasubyou
    Quote Originally Posted by Sleeper CP View Post
    Not mine, BTW.

    OOOOOOOOOOOOOOOOps. allot of hard work down the drain

    Dyno Video:
    http://s732.photobucket.com/albums/w...t=100_6747.flv


    Engine:


    New Jon Kaase Boss 429 "street" heads.

    Story:
    http://www.460ford.com/forum/showthread.php?t=138991

    Sleeper CP

    Big Inch Ford Lover

    guess this is getting off track a little but as you can see in the pics of this engine carnage it was a std trans flywheel on this engine on the dyno, look down at pic 5
    http://www.460ford.com/forum/showthread.php?t=138991
  • 09-15-2009, 07:47 AM
    havasubyou
    Quote Originally Posted by fc-Pilot View Post
    Is it just me or does it look like the external weight on the back of the crank was hitting the flex plate. I wonder if it was machined wrong and since it was hitting that weight it was bending the metal and therefore caused it to crack. Just a thought.


    Paul
    sorry no weight on rear of bbc crankshaft the line you see is false,crank flange does not extend past ring, pioneer brand, made in USA. sfi. and .140 thick..
    have some other sfi flexplates one is a tci and it also has the ring (step flange) and a thickness of .160
    and last a scat also has the same (stepped flange) with a thickness of .140

    i will give pioneer one thing they at least stamped where it was made. the tci and the scat does not.
    as far as (SFI) is a joke.some of the harmonic balancers that carry the sfi flag are just just some proof.
  • 09-14-2009, 09:05 PM
    fc-Pilot
    Is it just me or does it look like the external weight on the back of the crank was hitting the flex plate. I wonder if it was machined wrong and since it was hitting that weight it was bending the metal and therefore caused it to crack. Just a thought.


    Paul
  • 09-14-2009, 08:32 PM
    jetjunky
    Quote Originally Posted by Sleeper CP View Post
    Yes you do. Dyno time is "almost always" worth the cost.

    I'd think the dyno shop will pay for their own repairs in this case. I'm surprised that wasn't a SFI approved scatter shield or at least some type of heavy scatter shield.

    S CP
    Right! Since your the high roller, you pay for the parts and all and we'll flog the shit out my new motor on camera and we'll all have a good laugh. lol
  • 09-14-2009, 07:00 PM
    Shaun
    it was a stock plate, they say that in the original post. he said he forgot the SFI plate and the option was to not dyno it, or use a stocker they had at the dyno...
  • 09-14-2009, 06:47 PM
    71hallett
    Quote Originally Posted by fast76rogers View Post
    just because it says its sfi aproved doesnt mean shit now days
    I 100% agree. I would also say we can be our own worst enemy. Buy the best parts money can buy then bolt junk to them.
  • 09-14-2009, 04:58 PM
    fast76rogers
    Quote Originally Posted by havasubyou View Post
    here is a couple of pics of a sfi flex that came out of my sons 496..close call
    crack went around with blue line. usa made sfi flex tci drive plate to t-400 trans caught it during a oil pan change.



    this kind of plate is junk.last year on my blower motor only spinning 6000 rpm the balance weight flew off and stuck in my stringer. two inches up it was out the boat two inches down and i would have went out the bottom.just because it says its sfi aproved doesnt mean shit now days.no quality control anymore.
  • 09-14-2009, 04:27 PM
    gn7
    Imagine that wheel on the Boss 9 in a car and you are sitting passenger. OUCH!



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  • 09-14-2009, 03:47 PM
    fc-Pilot
    Yep, got a couple of those laying around the shop.


    Paul
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