Advanced Engine Specs (Valve Size, Cam, etc) for Header Calculations
#1
Advanced Engine Specs (Valve Size, Cam, etc) for Header Calculations
I've been trying to locate these specs published and I'm having a hard time. Does anyone know the following information or where to locate for the 2008 4.2 engine as well as the 5.0? I'm working on a set of tri-y headers. In order to do some calculations, I need to take all of this into account.
Intake valve head diameter:
Exhaust valve head dia.:
Intake lift at valve:
Int. duration @ .050 lift degrees*:
Intake opens @ o BTDC:
Exhaust lift at valve:
Exh. duration @ .050 lift degrees*:
Exhaust opens @ o BBDC:
Intake port dimensions:
Exhaust port dimensions:
Intake lobe centerline
Intake closes @ o ABDC
Exhaust lobe centerline
Exhaust closes @ o ATDC
Thanks in advance.
Intake valve head diameter:
Exhaust valve head dia.:
Intake lift at valve:
Int. duration @ .050 lift degrees*:
Intake opens @ o BTDC:
Exhaust lift at valve:
Exh. duration @ .050 lift degrees*:
Exhaust opens @ o BBDC:
Intake port dimensions:
Exhaust port dimensions:
Intake lobe centerline
Intake closes @ o ABDC
Exhaust lobe centerline
Exhaust closes @ o ATDC
Thanks in advance.
#2
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FrickenJag (03-13-2015)
#3
These are from the 4.2 and 5.0 litre workshop manuals plus a bit from the 5.0L technical guide:
4.2L
Valve head diameter intake (mm) 34.8 - 35.0
Valve head diameter exhaust (mm) 30.8 - 31.0
Camshaft lobe lift intake (mm) 8.50
Camshaft lobe lift exhaust (mm) 8.50
5.0L
Intake valve head diameter:36 ± 0.1
Exhaust valve head dia.:30 ± 0.1
Intake
Opens - 29 degrees BTDC (before top dead center) to 33 degrees ATDC (after top dead center)
Closes - 207 to 269 degrees ATDC
Exhaust
Opens - 244 to 194 degrees
Closes - BTDC 6 to 56 degrees ATDC
Camshaft lobe lift intake (mm) 10
Camshaft lobe lift exhaust (mm) 9.36
From a different source:
The Camshaft Profile Swiching system controls the lifting height of the intake valves. At engine speeds from idle up to the range of 2,800 – 4,825 rpm (load dependent), the intake valves have a lifting height of 5.5mm. At speeds and loads outside of this range, the high lift cam (10.53mm) is used.
Lifting Height Valve Opens Valve Closes
Intake – 5.5 mm lifting height
Opens - 27° BTDC to 35° ATDC
Closes - 187° ATDC to 249° ATDC
Intake – 10.53 mm lifting height
Opens - 37° BTDC to 25° ATDC
Closes - 213° ATDC to 275° ATDC
Exhaust – 9.36 mm lifting height
Opens - 244° BTDC or 194° BTDC
Closes - 6° ATDC to 56° ATDC
4.2L
Valve head diameter intake (mm) 34.8 - 35.0
Valve head diameter exhaust (mm) 30.8 - 31.0
Camshaft lobe lift intake (mm) 8.50
Camshaft lobe lift exhaust (mm) 8.50
5.0L
Intake valve head diameter:36 ± 0.1
Exhaust valve head dia.:30 ± 0.1
Intake
Opens - 29 degrees BTDC (before top dead center) to 33 degrees ATDC (after top dead center)
Closes - 207 to 269 degrees ATDC
Exhaust
Opens - 244 to 194 degrees
Closes - BTDC 6 to 56 degrees ATDC
Camshaft lobe lift intake (mm) 10
Camshaft lobe lift exhaust (mm) 9.36
From a different source:
The Camshaft Profile Swiching system controls the lifting height of the intake valves. At engine speeds from idle up to the range of 2,800 – 4,825 rpm (load dependent), the intake valves have a lifting height of 5.5mm. At speeds and loads outside of this range, the high lift cam (10.53mm) is used.
Lifting Height Valve Opens Valve Closes
Intake – 5.5 mm lifting height
Opens - 27° BTDC to 35° ATDC
Closes - 187° ATDC to 249° ATDC
Intake – 10.53 mm lifting height
Opens - 37° BTDC to 25° ATDC
Closes - 213° ATDC to 275° ATDC
Exhaust – 9.36 mm lifting height
Opens - 244° BTDC or 194° BTDC
Closes - 6° ATDC to 56° ATDC
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#4
Make sure you have a look at this https://www.jaguarforums.com/forum/g...-2l-s-c-80560/
The branching needs to be as per the drawings in that thread.
The branching needs to be as per the drawings in that thread.
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FrickenJag (03-13-2015)
#5
Thanks for the replies Gentlemen.
I wonder if the duration above for the 5.0 is the same for the 4.2. (I would think the numbers would be close) ?
I could potentially base my calculations for the steps/lengths upon this, I'm just a stickler for precision.
Thanks for the info.
Good link for the cheaper design and yes, that's the exact branching I was thinking with the firing sequence. I'm quite surprised Jaguar didn't go with this approach with the Supercharged setup. Cylinders 6 and 8 are a major concern for restrictive flow and excessive heat. I'm quite optimistic that a well tuned design will make surprising numbers with the exhaust fabricated.
I wonder if the duration above for the 5.0 is the same for the 4.2. (I would think the numbers would be close) ?
I could potentially base my calculations for the steps/lengths upon this, I'm just a stickler for precision.
Thanks for the info.
Good link for the cheaper design and yes, that's the exact branching I was thinking with the firing sequence. I'm quite surprised Jaguar didn't go with this approach with the Supercharged setup. Cylinders 6 and 8 are a major concern for restrictive flow and excessive heat. I'm quite optimistic that a well tuned design will make surprising numbers with the exhaust fabricated.
#6
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FrickenJag (03-18-2015)
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