[DeTomaso] Pantera flywheel and engine balance

[Asa Jay Laughton]

John,
You bring up an interesting question.

If an engine was balanced with a flexplate for an automatic
transmission.  Should the entire reciprocating assembly be re-balanced
if the engine will be re-purposed in a manual transmission car using a
new flywheel and clutch?  Or can the new flywheel and clutch be balanced
without disassembling the engine?

I think, based on my limited knowledge, the entire assembly needs to be
balanced.

Asa  Jay

Asa Jay Laughton, MSgt, USAFR, Retired
& Shelley Marie
Spokane, WA
******************************     
http://www.racingagainstautism.com
http://www.teampanteraracing.com
http://facebook.com/racingagainstautism


On 9/27/2014 8:17 PM, John Taphorn wrote:
> Jerry
>
> I would encourage you to rebalance the assembly with the flywheel that
> you intend to use.  If you think about it, should any of the bolt
> holes or the 28oz offset be slightly different, you will have an
> unacceptable result.  To me, it is analogous to the importance of
> degreeing a cam.  Different manufacturers have different standards for
> an acceptable tolerance and when combining the parts it is necessary
> to confirm they all add up properly to provide the intended result.
>
> I've learned the hard way, I once changed out a pressure plate with
> terrible results that required removing the ZF.
>
> JT
> On 9/27/2014 10:04 PM, Jerry Knotts wrote:
>>
>> The flywheel is a generic Procomp 351C wheel that I have only used
>> with engines on my engine test stand.  I sent it with the other parts
>> just to provide the 28 inoz wheel for the balance of the other parts.
>>
>> On 9/27/2014 9:04 PM, Mike Drew wrote:
>>> Jerry,
>>>
>>> A Pantera clutch bolts right up to any ford flywheel.
>>>
>>> A Pantera Centerforce clutch doesn't fit anything except a
>>> Centerforce flywheel. To bolt it to a standard flywheel the flywheel
>>> needs to be redrilled. It has to be done perfectly or else the
>>> clutch won't be centered and it will create a huge imbalance.
>>>
>>> Presuming you have a Centerforce, I would scrap it and buy a proper
>>> McLeod Pantera clutch. It will bolt right on and let you preserve
>>> your balance.
>>>
>>> Good luck!
>>>
>>> Mike
>>>
>>> Sent from my iPhone
>>>
>>> On Sep 27, 2014, at 18:48, Jerry Knotts <knottsj at galstar.com> wrote:
>>>
>>>> Old timers has me and I know this has been answered a number of
>>>> times on flywheel teeth and balance - but-
>>>> Having an engine built and have run into a sticking point on my 351C.
>>>> The new engine has been through a balance process with a generic
>>>> flywheel and we are getting ready to assemble the short block.  I
>>>> think the flywheel is a 164 tooth 28 oz model.  I have been using
>>>> it on my engine stand for run in purposes.   Checked a pressure
>>>> plate for it and the mounting holes are not correct for a Pantera
>>>> clutch. Haven't worried about a specific flywheel thinking that I
>>>> would just change flywheels and make sure the balance of the new
>>>> one matched the old one.  The machinist told me today that if I use
>>>> another flywheel it needs to be balanced to the bob weights of the
>>>> pistons, rods, crank a harmonic balancer being used on this
>>>> particular engine.  This means that the engine can't be assembled
>>>> until I get a functional flywheel.
>>>>
>>>> Is it correct that the flywheel must be balanced with the rotating
>>>> mass and can't be changed to another flywheel later??
>>>>
>>>> Thanks in advance,
>>>> jerry
>>>>
>>>> PS Entered my black 71 twin turbo in a large car show today in the
>>>> Import class.  Was disappointed that I lost out to a Ferrari kit
>>>> car, and 2 mid 60s Volkswagens.  I was going to ask for a Senior
>>>> Innovation Exemption since mine isn't a Corvette, Mustang, shoebox
>>>> Chevrolet or a Model A.
>>>>
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>>
>>
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