[Fot] Cam Timing Degree Specs

[Glenn Franco]

Thanks to all for the feedback on cam timing specs.
The cam checked out at both .010" and .050" lift  to the specs you all 
provided and with the intake at 110 deg ATDC of full lift.
Thanks for the Help!
Glenn

On 6/1/2011 11:47 AM, Larry Young wrote:
> The best way to set up a cam is to use the intake center, i.e. point 
> of highest lift.  It should be 110 ATC for this cam. (the average of 
> 18 BTC and 58 ABC).  Look at my webpage on degreeing a cam - 
> http://www.tildentechnologies.com/Cams/Tips_Takes.html   There is also 
> a spreadsheet you can download.
>
> Richard, the reason for the difference between .007 and .010 is what I 
> call "valve train squish", i.e. the amount of compression in the valve 
> train due to the springs.  Integral cams listed the 0.050 specs at 210 
> also.
> Larry
>
> On 5/31/2011 9:27 PM, Richard Good wrote:
>> Glenn,
>>
>> The timing specs for the late TR6 cam are:
>>
>> Intake open 18 deg BTDC, close 58 deg ABDC
>> Exhaust open 58 deg BBDC, close 18 deg ATDC
>>
>> I believe these timing specs are supposed to be point of 
>> opening/closing. If that is the case, with valve clearance spec of 
>> .010" at the valve, the tappet has to move .010" divided by rocker 
>> ratio of 1.45:1 = .007" before the valve starts opening.  So you 
>> should be able to time to these specs at .007" of tappet lift.  Stock 
>> cams I have checked appear to have this advertised duration at about 
>> .010" tappet lift so you may have to go to .010" to get these timing 
>> points to hold out.
>>
>> I have never seen .050" timing specs for the stock cam but the ones I 
>> have checked appear to have about 210 deg duration at .050" so the 
>> timing specs would be:
>>
>> Intake open 5 deg ATDC, close 35 deg ABDC
>> Exhaust open 35 deg BBDC, close 5 deg BTDC
>>
>> Regards,
>> Richard Good
>> Good Parts Inc.