Hipo 289 flywheel

[paul]

I purchased a beautiful standard bore hipo block(5 bolt) from forum member. I need a flywheel for it.

1) Is the 5 bolt hipo flywheel different from the hipo flywheel used on a 6 bolt block?

2) If a hipo flywheel is different from non hipo flywheel, how other than paint daub and hardness test mark can I identify it?

Thank you in advance. Paul.

[gt350hr]

  Paul ,
     In THE most technical sense you need a C30E flywheel  for a 5 bolt engine which came with a 160 tooth ring gear. Replacement ring gears are now 157 tooth. No problem. Yes the hi po version has the brinell test mark and "usually " an orange paint swipe along with the difference balance. The C5OE and C7ZE will interchange . If you are rebalancing the engine ,  a non hipo unit could be substituted. if you aren't , you would be best to use an original to get "close".
   Randy

[6s1640]

Hi Paul,

The difference is the counter balance.  The HiPo has a 30.4 OZ counter balance compared to the LoPo at 28.2 OZ.  This applies to both the HiPo flywheel and HiPo flex plate.

Hope that helps.

Cory

[paul]

Thank you guys. Paul.

[69mach351w]

  Paul ,
     In THE most technical sense you need a C30E flywheel  for a 5 bolt engine which came with a 160 tooth ring gear. Replacement ring gears are now 157 tooth. No problem. Yes the hi po version has the brinell test mark and "usually " an orange paint swipe along with the difference balance. The C5OE and C7ZE will interchange . If you are rebalancing the engine ,  a non hipo unit could be substituted. if you aren't , you would be best to use an original to get "close".
   Randy

Where is the brinnell test mark located?

[s2ms]

Where is the brinnell test mark located?

Typically like this one...

[69mach351w]

So, the test mark is the paint?  Was curious because I'm a Machinist by trade and I recall brinnell hardness marks being made with a hardness punch usually a dial test machine.

[s2ms]

Red arrow points to the test mark, a ground smooth area and punch mark about the size of BB. Orange paint duab is a  HiPo part identifier.

[Dan Case]

So, the test mark is the paint?  Was curious because I'm a Machinist by trade and I recall brinnell hardness marks being made with a hardness punch usually a dial test machine.

Correct. A test machine is required. Round ball is pressed into the metal and leaves a permanent mark.

https://en.wikipedia.org/wiki/Brinell_scale

There was also a Rockell® test machine and scale. Same science.

https://en.wikipedia.org/wiki/Rockwell_scale

[gt350hr]

   Dan there are also separate scales . Flywheels ( steel and cast iron parts in general) are done on the C scale and the aluminum we use here at work is done on the B scale. The size of the "dimple" varies too. We use ours daily. Sadly it will not reproduce the impression seen on HiPo flywheels , I tried LOL
  Randy

[Dan Case]

   Dan there are also separate scales . Flywheels ( steel and cast iron parts in general) are done on the C scale and the aluminum we use here at work is done on the B scale. The size of the "dimple" varies too. We use ours daily. Sadly it will not reproduce the impression seen on HiPo flywheels , I tried LOL
  Randy

I did Rockwell® scale ball (two common diameters) and diamond cone testing at work for 37+ years. Aluminum alloys and carbon steel alloys mostly.  The first machine we had was super manual and I had to do many repeats with a standard and the test sample before telling a supplier their parts or materials didn't meet specification and we were sending the back. The semi-automatic machine we had subsequently resulted in less spread in repeat tests. To send thousands to hundred of thousands of dollars worth of new parts or material back mean the results had to be beyond reproach.


Also got lots of experience testing elastomeric materials in the Shore® system and scale. Then there was 37+ years of paint hardness via the "pencil" method; widely used in the paint industry but a horrible subjective test method.

[69mach351w]

Red arrow points to the test mark, a ground smooth area and punch mark about the size of BB. Orange paint duab is a  HiPo part identifier.

Sorry Dave, I had to move the photo over with mouse to see the red arrow, my bad

[paul]

What source would you guys recommend to buy a new ring gear(160 or 157 tooth)? Thank you, Paul.

[6s1640]

Hi Pual,

A search on Summit Racing or Napa show three different choices, Balkamp, ATP Automotive and Pioneer Automotive.  I expect there are more.  These can be found on a popular auction site with just a little patients.  There are several NOS on auction now, 164 teeth, but IIRC they are the the larger flywheel.

Here is one, NOS, but double check the application and part number, C20Z6384B.  I am not sure if this is the correct number or not.

https://www.ebay.com/itm/OEM-1962-1965-Ford-Fairlane-Mustang-Flywheel-Gear-Ring-C20Z6384B-PLEASURECRAFT/323369396795?epid=1711176345&hash=item4b4a516a3b:g:lV8AAOSw3D5bWyVg

Best of luck

Cory

[acman63]

Im not sure anyone has ever serviced a 160 tooth ring gear.  Ive looked back in my parts book to late 66 and only can find 157 teeth part numbers.  if anyone has a part number for 160 tooth  list it here