Camshaft calculations Lancia Delta Integrale 8V

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Squadracorse
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Joined: July 29th, 2006, 8:12 am
Location: Netherlands
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Camshaft calculations Lancia Delta Integrale 8V

Post by Squadracorse »

Hi,

I am doing some calculations to determine if the cheap conversion will work on my Lancia Delta Integrale 8V turbocharged engine.

Checking the workshop manual and GCMTFLTC book I have the following results:

STD Lancia Delta Integrale 8V:
Cam Lift In = 9,1mm
Cam Lift Ex = 8,6mm
Inlet opens BTDC 8°
Inlet closes ABDC 42°
Exhaust opens BTDC 42°
Exhaust closes ABDC 1°

When I have done the calculations right;

Inlet full lift is at 107° after TDC
Exhaust full lift is at 110,5° before TDC

a) did I do the calculations right ?

Fiat Ritmo 130TC 8V:
Cam Lift In = 10,033mm
Cam Lift Ex = 10,033mm
Inlet opens BTDC 7°
Inlet closes ABDC 52°
Exhaust opens BTDC 51°
Exhaust closes ABDC 8°

When I have done the calculations right;

Inlet full lift is at 112,5° after TDC
Exhaust full lift is at 111,5° before TDC

b) again, are these calculations right ?

Now I am wondering how to calculate / determine the following:
c) Duration
d) Timing
e) Lobe center angles
f) Valve lift TDC

Can you help me?
I cavalli sono sempre pochi, I Kg sono sempre troppi!
Guy Croft
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Joined: June 18th, 2006, 9:31 am
Location: Bedford, UK
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Re: Camshaft calculations Lancia Delta Integrale 8V

Post by Guy Croft »

STD Lancia Delta Integrale 8V:
Cam Lift In = 9,1mm
Cam Lift Ex = 8,6mm
Inlet opens BTDC 8°
Inlet closes ABDC 42°
Exhaust opens BTDC 42°
Exhaust closes ABDC 1°

When I have done the calculations right;

Inlet full lift is at 107° after TDC
Exhaust full lift is at 110,5° before TDC

a) did I do the calculations right ?


YES!



Fiat Ritmo 130TC 8V:
Cam Lift In = 10,033mm
Cam Lift Ex = 10,033mm
Inlet opens BTDC 7°
Inlet closes ABDC 52°
Exhaust opens BTDC 51°
Exhaust closes ABDC 8°

When I have done the calculations right;

Inlet full lift is at 112,5° after TDC
Exhaust full lift is at 111,5° before TDC

b) again, are these calculations right ?


YES!


Now I am wondering how to calculate / determine the following:
c) Duration YOU CAN'T GET IT FROM THOSE FIGURES - THOSE IVO/IVC FIGURES ARE BASED ON A FACTORY SPECIFIED WIDE RUNNING CLEARANCE. WHEN DURATION IS QUOTED BY AFTERMARKET CAM MFR IS US INVARIABLY QUOTED AS 'FLAT FOLLOWER LIFT' WITH ZERO CLEARANCE. TO FIND OUT THE DURATION YOU NEED TO PART-ASSEMBLE A HEAD AND PUT A DIAL GAUGE ON THE VALVE AND PROTRACTOR ON THE CAM PULLEY.
d) Timing WITH TRUE RUNNING CLEARANCE THE VALVE TIMING WILL BE DIFFERENT THO FL WILL BE UNAFFECTED
e) Lobe center angles ADD TOGTHER THE INLET AND EX FL, DIVIDE BY 2 TO CONVERT TO CAM DEGREES - THIS IS HOW LSA (OR LCA - LOBE CENTERLINE ANGLE) IS QUOTED UNLIKE DURATION AND TIMING WHICH ARE IN CRANK DEG
f) Valve lift TDC CAN ONLY BE DETERMINED BY TIMING UP THE CAM AND MEASURING! (SORRY!)

g
Guy Croft, owner
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