[200q20v] Re: Gears

Bernie Benz b.m.benz at prodigy.net
Tue Nov 13 13:03:02 EST 2001 

My eyeball and the protractor on my machinest's combination square couldn't
be off that far, I don't think.  Maybe 40:50?

Bernie

> From: "Cordeiro, Alan" <Alan.Cordeiro at mts.com>
> Date: Tue, 13 Nov 2001 12:45:08 -0600
> To: "'Bernie Benz'" <b.m.benz at prodigy.net>
> Subject: RE: Gears
>
> 30:60 is more typical than 45 degrees. It allows a bigger gear
> around the camshaft, and a smaller gear in the distributor rotor
> axle
>
> -----Original Message-----
> From: Bernie Benz [mailto:b.m.benz at prodigy.net]
> Sent: Tuesday, November 13, 2001 2:08 PM
> To: Cordeiro, Alan
> Subject: FW: Gears
>
>
>
>
> ----------
>> From: Bernie Benz <b.m.benz at prodigy.net>
>> Date: Tue, 06 Nov 2001 07:41:08 -0800
>> To: Derek Pulvino <dbpulvino at hotmail.com>
>> Subject: Re: Gears
>>
>> With a little further thought, that measured, eye balled, helix angle must
>> really be 45 degrees, half of the angle between shaft center lines.
>>
>> Bernie
>>
>>
>> With only a dial caliper, no way to measure pitch diameter, but here are
> my
>> measurements.  We probably need to know the center to center distance of
> the
>> two shafts also.  Of course, the mating cam gear would be half this
> diameter
>> and number of teeth.
>>
>> OD         1.225"
>> Root Dia    .950"
>> Face width  .390"
>> Hub Dia     .875"
>> Overall L   .790"
>> Shaft Dia    12mm
>> Teeth        14
>> Helix Angle  40 deg.
>>
>> Bernie
>>
>>> From: "Derek Pulvino" <dbpulvino at hotmail.com>
>>> Date: Mon, 05 Nov 2001 14:21:50 -0800
>>> To: b.m.benz at prodigy.net
>>> Subject: Re: Gears
>>>
>>> That would work out pretty well if'n we ever get this ship off the dock.
> At
>>> this point, as our engineering liason, do you think you could provide any
>>> kind of guestimate on pitch for the gear.  When I talked to the Seattle
> Gear
>>> people they said they needed a pitch or example on hand before they could
>>> provide any estimate.
>>>
>>> It be nice to gauge interest before thowing a distributor in the mail.
>>> Another alternative for a template would be able getting the scraps from
>>> Pete Kunzler's old distributor, depending on just how broken the old gear
>>> is.
>>>
>>> Any educated guesstimates on this.  I'm not exactly sure where to start
> on
>>> measuring pitches.
>>>
>>> Derek P
>>>
>>>
>>>> From: Bernie Benz <b.m.benz at prodigy.net>
>>>> To: Derek Pulvino <dbpulvino at hotmail.com>
>>>> Subject: Re: Gears
>>>> Date: Thu, 01 Nov 2001 22:20:39 -0800
>>>>
>>>> Right now I have a spare plastic 3B dist. which will go into my "3Bing
> of
>>>> the 7A" project when I get aroundtoit.  After that, the 7A will be
> surplus.
>>>> So, ultimately I need two metal gears, one each for the 200 and the 90.
>>>>
>>>> Let the SGW recomend a good, free maching steel that they use.  I am
>>>> willing
>>>> to provide the dist core for SWG, if you wish.
>>>>
>>>> Bernie
>>>>
>>>>
>>>>> From: "Derek Pulvino" <dbpulvino at hotmail.com>
>>>>> Date: Thu, 01 Nov 2001 16:11:00 -0800
>>>>> To: b.m.benz at prodigy.net
>>>>> Subject: Re: Gears
>>>>>
>>>>> Bernie,
>>>>>
>>>>> Do you have any guess on what the pitch of the distributor gear is?
>>>> Just
>>>>> something to use to kind of ballpark prices.  There's a place up here
> in
>>>>> Seattle called Seattle Gear Works and I believe that's all they do, cut
>>>>> gears.
>>>>>
>>>>> I know we can alway's take the old gear to them for a blueprint, but
>>>> don't
>>>>> have one right now.  Wanted to figure out an approximate price to give
>>>> to
>>>>> the list, and see what the interest would be.  If it generates enough
>>>>> interest I know that Pete Kunzler recently replaced his distributor,
> and
>>>>> he's not that far from here.
>>>>>
>>>>> What's your feeling on best source material?
>>>>>
>>>>> Derek P
>>>>>
>>>>>
>>>>>> From: Bernie Benz <b.m.benz at prodigy.net>
>>>>>> To: Derek Pulvino <dbpulvino at hotmail.com>
>>>>>> Subject: Re: Gears
>>>>>> Date: Thu, 01 Nov 2001 07:25:31 -0800
>>>>>>
>>>>>>
>>>>>>
>>>>>>> From: "Derek Pulvino" <dbpulvino at hotmail.com>
>>>>>>> Date: Thu, 01 Nov 2001 02:09:44 -0800
>>>>>>> To: b.m.benz at prodigy.net
>>>>>>> Subject: Gears
>>>>>>>
>>>>>>> Bernie,
>>>>>>>
>>>>>>> Some stream of consciousness questions for you...
>>>>>>>
>>>>>>> What do you call the type of gear that is used on the distributor
>>>>>> currently
>>>>>>> in question? Is it Helical?
>>>>>> The gear is a helically cut gear, differing from a straight cut spur
>>>> gear
>>>>>> in
>>>>>> that the contact point between the two gears is always at the same
>>>> radius
>>>>>> for each gear of the pair, which results in a constant velocty
>>>> transfer.
>>>>>> Also, the only gear system that can be system addaptable to
> nonparallel
>>>>>> shafts.
>>>>>>> Isn't that gear basically cut on two radiuses
>>>>>>> to minimize noise by way of minimizing the contact area between the
>>>>>> drive
>>>>>>> and driven gear at any given moment in time?  What type of machinery
>>>>>> would
>>>>>>> be needed to facilitate the cutting of said gears?
>>>>>> Any common gear cutting screw machine.
>>>>>>> Is quality an issue with
>>>>>>> machine shops such that a poorly cut gear might wind up in somebodies
>>>>>> hands
>>>>>>> and result in a situation that would mitigate the benefit of removing
>>>>>> the
>>>>>>> plastic gear (ie bad gear mismatching with the cam, damaging cam, and
>>>>>>> possibly jaming, leading to a timing belt problem, etc.  maybe far
>>>>>> fetched
>>>>>>> but...)?  I know workmanship will come in to play to some degree, but
>>>>>> what
>>>>>>> do you foresee the life of the replacement seals to be?  Would you
>>>>>> harbor
>>>>>>> many doubts that a viton seal used to replace the worn factory seal
>>>> will
>>>>>>> have the same longevity as the factory seal if correctly installed
>>>>>> without
>>>>>>> being compromised?
>>>>>> I am positive that a commercial seal is available, and easily found.
>>>> Viton
>>>>>> would be overkill, but wouldn't hurt.  A common nitrile material would
>>>> be
>>>>>> fine, so lots of choices.  I've changed seals in many Lancia/Fiat
> dist.
>>>>>>
>>>>>> Bernie
>>>>>>>
>>>>>>> The reason I'm asking these questions is I foresee these as potential
>>>>>> issues
>>>>>>> in moving forward on this.  As far as group purchases, this one seems
>>>> a
>>>>>>> little different (although in reflection it's not that different from
>>>> a
>>>>>>> group purchase of custom bent exhaust tubing) to me than buying
>>>> somebody
>>>>>>> elses goods.  I feel like the person in charge is basically
> inheriting
>>>>>> some
>>>>>>> liability in reference to the quality of the product.  If this
>>>> purchase
>>>>>>> happens, the goods can't be crap.
>>>>>>>
>>>>>>> Additionally I think Kevin is going to/or has dropped the ball on
> this
>>>>>> one
>>>>>>> and I'd like to see it happen.
>>>>>> Yes, I think so too.  If his problem is only money, I'm pushing him.
>>>>>>
>>>>>> Bernie
>>>>>>
>>>>>>>
>>>>>>> Any input you have would be appreciated.
>>>>>>>
>>>>>>> thanks
>>>>>>>
>>>>>>> Derek P
>>>>>>>
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>>>>>>
>>>>>
>>>>>
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>>>
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