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advinnie
Samba Member
Joined: November 18, 2011
Posts: 1405
Location: oxfordshire
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 Posted: Mon Jan 06, 2014 2:46 pm Post subject: forged or cast lightened flywheel |
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Hi all I need a lightened 8 dowelled flywheel but should I get a cast or forged one and why?
I'm not going to be racing my bug on a track at all and it will not be reved above 6000 RPM. |
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Brian_e 
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Joined: July 28, 2009
Posts: 3945
Location: Rapid City, South Dakota
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Danwvw
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Joined: July 31, 2012
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Location: Oregon Coast
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 79411
Location: Sneaking up behind you
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| Posted: Mon Jan 06, 2014 3:15 pm Post subject: |
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| Danwvw wrote: |
| Is there such a thing as a forged VW Flywheel? |
Stock flywheels are forged.
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Glenn
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Danwvw
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Joined: July 31, 2012
Posts: 8895
Location: Oregon Coast
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| Posted: Mon Jan 06, 2014 4:24 pm Post subject: |
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Saw this one on e-bay for $120, says it's supposed to be a lightened VW Flywheel. When I built my 1800cc Type 1 engine for my bus, I had an old stock VW flywheel surfaced and drilled for 8 dowels and balanced to the crank with the clutch but not lightened.
"VW Forged Lightened Chromoly Flywheel 8-Dowel Type-1"
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gt1953
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Joined: May 08, 2002
Posts: 13947
Location: White Mountains Arizona
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| Posted: Mon Jan 06, 2014 5:49 pm Post subject: |
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A lightened flywheel revs quicker, in a bus you are better off with the heavy flywheel. It keeps the inertia better.
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vwracerdave
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Joined: November 11, 2004
Posts: 15599
Location: Deep in the 405
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| Posted: Mon Jan 06, 2014 6:07 pm Post subject: |
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The $79 cast flywheel are fine for a street engine if you're never going to drag race or see over 6000 RPM.
If your racing (street or track) or turning more RPM's then you should get a $120 forged chromoly flywheel or use a genuine VW flywheel.
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Brian
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Joined: May 28, 2012
Posts: 8340
Location: Oceanside
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| Posted: Mon Jan 06, 2014 11:34 pm Post subject: |
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| vwracerdave wrote: |
The $79 cast flywheel are fine for a street engine if you're never going to drag race or see over 6000 RPM.
If your racing (street or track) or turning more RPM's then you should get a $120 forged chromoly flywheel or use a genuine VW flywheel. |
I'm a strong believer in this, but while on the subject, what about a heavier pulley? I remember reading a post in a debate with Gene Berg about a heavy pulley and how they found the best combination for increased bearing life was a heavy pulley and lightened fly-wheel. It's all about inertia and the engine's resonance.
These suckers are 5.5 pounds
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Mr.Duncan
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Joined: May 12, 2012
Posts: 3543
Location: Houston, TX
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| Posted: Tue Jan 07, 2014 7:29 am Post subject: |
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| lustig69 wrote: |
| vwracerdave wrote: |
The $79 cast flywheel are fine for a street engine if you're never going to drag race or see over 6000 RPM.
If your racing (street or track) or turning more RPM's then you should get a $120 forged chromoly flywheel or use a genuine VW flywheel. |
I'm a strong believer in this, but while on the subject, what about a heavier pulley? |
That does make sense.
But, I assume the idea is the heavy flywheel wants to pull UP on the end with the pulley right?
So install a heavy pulley on that end to kinda "even the balance out"
But, wouldn't the Generator/alt belt tension pull up on that end of the crank so there is no real gain?
Just wondering.
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slalombuggy
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Joined: July 17, 2010
Posts: 9322
Location: Canada
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| Posted: Tue Jan 07, 2014 9:38 am Post subject: |
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IF you are racing you CANNOT use a cast flywheel, they are banned on NHRA tracks. There was a picture last year going around of a bug with the rear end blown off of it and the engine hanging on the accelerator cable after a cast flywheel exploded at the line injuring some people.
brad |
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modok
Samba Member
Joined: October 30, 2009
Posts: 27645
Location: Colorado Springs
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| Posted: Tue Jan 07, 2014 6:42 pm Post subject: |
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| The cast iron flywheels are from mexican bugs. They are not very good, and not cheaper either. Get a modified OE flywheel from DPR, made of German STEEL |
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modok
Samba Member
Joined: October 30, 2009
Posts: 27645
Location: Colorado Springs
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| Posted: Tue Jan 07, 2014 6:44 pm Post subject: |
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| slalombuggy wrote: |
There was a picture last year going around of a bug with the rear end blown off of it and the engine hanging on the accelerator cable after a cast flywheel exploded at the line injuring some people.
brad |
ah jeez, that should never have happened but I guess it would be an easy mistake to make with these darn iron "lightened" flywheels being sold. |
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hooker
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Joined: October 07, 2004
Posts: 261
Location: Bend, Oregon
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| Posted: Wed Jan 08, 2014 8:27 am Post subject: flywheels |
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In NHRA drag racing the porsche and volkswagen flywheels were the only "STOCK" flywheels that were allowed to run on a turbo charged VW or Porsche engine. All other vehicles (chebys,fords etc) had to use an after market flywheel.
That should tell you something.
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