E-Grind cam specifications

[Brent Lineker]

I just got back from machine shop to get my specifications for my cams.I had e cams put in for a 2.7 rebuild with mahle RS 90 mm p&c's webers,ssi's and sport exhaust.The specifications are as follows.These were reground from my CIS cams
-Intake duration 219 at .05 valve lift .420
-Exhaust duration 212 at .05 valve lift ..396
I can't find these specifications on any chart.Does anyone know if these are indeed e cams or in fact something milder.

[emcon5]

According to John the Camgrinder's chart, that doesn't match any stock cam.

http://www.drcamshafts.com/911profilesprint.htm

The E should be 230º @.050"with .405"lift on the intake and 222º @.050"with .393"lift on the exhaust.

Tom

[Brent Lineker]

That is the same chart I was looking at too.The machinest told me that the factory specs are the ones he gave me,but I can't find where to look for factory specs.

[moneymanager]

Dumb question, bit off topic. I understand lift and duration, but was does the "at .050" spec tell me? Thanks

[emcon5]

Originally Posted by moneymanager

Dumb question, bit off topic. I understand lift and duration, but was does the "at .050" spec tell me? Thanks

It is just the duration starting and stopping as the cam passes at .050" of lift. It is a simple way to make apples-apples comparisons between cams,as some manufacturers list seat duration, or don't mention what they are talking about. For example, Elgin http://www.elgincams.com/c-por2.html "Our duration figures are the end of the clearance ramp"

Tom

[moneymanager]

Thanks Tom, very helpful.

[RoninLB]

[Brent Lineker]

They gave me timing specs of- intake opens@29 btdc closes @39abdc
-exhaust opens@39 bbdc closes@19 atdc

[RoninLB]

ok

those 1970/71 valve timing numbers are incorrect says Allan Caldwell.

the 1969 and the 1970/71 E cam are same so says everyone. The yellow was circled by Stoddard.








sorry for my confusion