Viper Registry Data Incorrect On Cam

[Trailertrash]

The Viper registry has the 2000 cam specs the same as the 96-99 in the open and closing degrees on the intake and exhaust. This is incorrect. I question this as the 96-99 cams have 6 more degrees of over lap. Long story short here are the proper cam specs for the 96-99 year 708 cam and the 2000 cam sorry I dont have any other data on newer years

96-99
Intake opens 23.5 degrees
Intake closes 86.5 degrees
Exhaust opens 82.5 degrees
Exhaust closes 42.5 degrees
Intake duration 290 Intake center line 121.5 degrees
Exhaust duration 305 Exhaust centerline 110 degrees
Valve over lap 66 degrees
recommend install at 119 = 2.5 degrees advanced

2000
Intake opens 23.5 degrees
Intake closes 86.5 degrees
Exhaust opens 88.5 degrees
Exhaust closes 36.5 degrees
Intake duration 290 Intake center line 121.5 degrees
Exhaust duration 305 Exhaust centerline 116 degrees
Valve over lap 60 degrees
recommend install straight up as it is a cream puff with fast bleed down lifters.
Thought everyone would like this info as the 708 cam is so very popular to install as an OEM replacement.
Steve

 

[Chuck 98 RT/10]

Not doubting you, but how did you find the difference? Where did you get the new info?

 

[99 R/T 10]

No lift data? How did you confirm the data? Did you get a cam from each year? Also, the Registry shows the lift on the 96-97 cams at .541 where the 98-99 are .542. Looking forward to the process you used to confirm the data....................................................

 

[Trailertrash]

I used the stock OEM cam in my 2000GTS and the intake center line method to find the data. I did this to compare to the 708 from year 99 I installed into the same engine and used the same data gathering method. I found the lift value to be true to the registry on year 99 at .541 and 542 on the year 2000. I also took the open and closing values posted by the registry and layed out these values onto the degree wheel to verify. The values I posted are what I achieved. I did this same procedure 4 times to verify it was accurate.

 

[Chuck 98 RT/10]

I used the stock OEM cam in my 2000GTS and the intake center line method to find the data. I did this to compare to the 708 from year 99 I installed into the same engine and used the same data gathering method. I found the lift value to be true to the registry on year 99 at .541 and 542 on the year 2000. I also took the open and closing values posted by the registry and layed out these values onto the degree wheel to verify. The values I posted are what I achieved. I did this same procedure 4 times to verify it was accurate.

Nice job.

 

[Trailertrash]

What brought this hole thing about was the fact my 2000 service manual shows differant numbers when it came to Exhaust open and close degrees. So after laying all numbers out on a degree wheel to verify the service manual was correct and the viper reg was not.

 

[Greg Good Cylinder Heads]

I hope you advanced the 708, and it's not in at 121.5.

BTW, how are you figuring intake lobe location? Seat timing or .050" (or a similar value) down from the nose?

 

[got one]

Sounds like good research...this is definately a bookmarked thread.

 

[Trailertrash]

Wallace Racing - Automotive Calculators
I used this web site as it has many good calculators.

 

[Trailertrash]

Enter your data into the camshaft calculator. Works very well.