[DeTomaso] Cleveland Timing Set

Larry - Ohio Time Corp larry at ohiotimecorp.com
Thu Sep 25 15:36:14 EDT 2008


Hi Paul,

Every good answer always brings more questions. If the crank lives well with
the harmonics how are they bad for a cam?

Larry - Cleveland


-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of Paul - Home
Sent: Thursday, September 25, 2008 3:20 PM
To: unlisted-recipients:; no To-header on input
Cc: detomaso at realbig.com
Subject: Re: [DeTomaso] Cleveland Timing Set

The concept of harmonics in the gear train goes like this...

The crankshaft doesn't actually turn smoothly, it twists and untwists. 
These twists and untwists get transferred to the camshaft through the 
drive.  With a gear drive they are directly coupled, with a chain and 
gear some of the twists get "used up" in the slop in the chain and are 
not transferred the camshaft.  With a belt even more of the twists "used 
up" by the belt stretching and relaxing.

At least that's how I've heard it explained.

Paul
#9270

Larry - Ohio Time Corp wrote:
> Last year I spoke to Dan Jones friend from AU that imports the Cleveland
> parts, I forgot his name. He was telling me one of the big advantages of
his
> belt drive for the cam is the much reduced harmonics transfer from the
crank
> to the cam. He also said the gear drives were the worst for this transfer.
> 
> I am well aware of harmonics in music, a good thing, how are they bad in a
> motor?
> 
> Larry - Cleveland
> 
> 
> 
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com]
On
> Behalf Of cengles at cox.net
> Sent: Thursday, September 25, 2008 11:06 AM
> To: Thomas Tornblom
> Cc: detomaso at realbig.com
> Subject: Re: [DeTomaso] Cleveland Timing Set
> 
> 
> Dear Thomas and Asa,
> 
> I understand the cool factor with gear drive. I understand it has a cool
> sound. I understand that it is supposed to more "accurately time cam
events"
> than a timing chain.
> 
> Dumb question: Does it ever "wear out" like a double roller timing chain?
> 
> Curious, Chuck Engles
> 
> PS: I called Summit: the 351C set *might* be available, but Summit found
> that it wasn't reliably and immediately available and ceased to carry it.
> So, a direct contact to PJ Gear Drives would answer that question, but I
> can't find any way to directly contact them even through their
> website---they seem to be a secretive bunch.
> 
> 
> 
> 
> 
> ---- Thomas Tornblom <Thomas.Tornblom at hax.se> wrote:
>> Asa Jay Laughton skrev:
>>> I put a Pete Jackson quiet gear drive:
>>> Summit Racing:
>>>
http://store.summitracing.com/partdetail.asp?part=PJJ-289-9C&autoview=sku
>> That one is for windsors.
>>
>> Looking at:
>>
>> http://www.petejacksongeardrives.net/24122.html
>>
>> it seems it is discontinued, and I don't see any cleveland gears either.
>>
>>
>>> in my 1971 Mach I. I can still hear it, but it's not bad at all
>>> really. Once it gets some revs to it, it begins to sound a bit like a
>>> blower, so there is that cool factor. Overall I'd do it again.
>>>
>>> Asa Jay
>>>
>>> Asa Jay Laughton, MSgt, USAFR, Retired
>>>
>>> &Shelley Marie
>>> Spokane, WA
>>>
>>> 1973 Pantera L 5533
>>> [ASASCAT]
>>>
>>> ******************************
>>> http://www.asajay.com
>>> http://www.351c.info
>>>
>>>
>>>
>>>
>>> tony DiGiovanna wrote:
>>>> I have previously seen more chain stretch than I like, even with good
>>>> quality double roller sets and hole drilled in front galley plug for
> extra
>>>> oiling. I am considering trying a gear drive in a new engine build.
> Please
>>>> post me your experiences good or bad. Please include mfr and model.
Seem
>>>> to recall there are really noisy ones and not so noisy ones.
>>>>
>>>> Thanks guys in advance.
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