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Premium Member
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220 Posts
Discussion Starter #1
Wondering if I should use the standard cam timing for this 101 1300N with Lucas distributor, original cams and now sporting a 36DCD with 25mm venturis and a vacuum takeoff.

Jim
San Antonio, TX
 

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Richard Jemison
Joined
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7,381 Posts
Yes, the carb requires a steady vacuum (think MAP pressure) to fuel correctly at idle and low RPMs. The cam timing is designed to reduce overlap.
The cam profiles for the 1300/1600 Normale/2600/102 2 liter is below.

TYPICAL 9.0mm Lift Alfa Cam(.354 lift)
1300-1600 Normale/2000 Iron block, 2600 (106-01)
.010 350
.020 254
.040 228
.050 222
.100 199
.200 154
.250 126
.300 91
.350 26
Max lift .354
You might try swapping a later 10520 cam only on the intake side and setting it at the Normale factory LC mark which is 111.5. You will need minor jet change likely one size larger main jets.
I have 3 of these that are like new. Too good to use as cores. $ $60.00 each inc shipping
Profile of the 10520 cam is below.

Typical“ CAM PROFILE” OF ALL LOBE SHAPES (USA) FROM FACTORY 1972-1989
10520 03200 00 cam lobe (USA FI cam)
Lift .378 (9.6mm)
.010 348
.020 284°
.040 234°
.050 226°
.100 205°
.150 185°
.200 162°
.300 106°
.350 64°
 

·
Premium Member
Joined
·
220 Posts
Discussion Starter #4
Yes, the carb requires a steady vacuum (think MAP pressure) to fuel correctly at idle and low RPMs. The cam timing is designed to reduce overlap.
The cam profiles for the 1300/1600 Normale/2600/102 2 liter is below.

TYPICAL 9.0mm Lift Alfa Cam(.354 lift)
1300-1600 Normale/2000 Iron block, 2600 (106-01)
.010 350
.020 254
.040 228
.050 222
.100 199
.200 154
.250 126
.300 91
.350 26
Max lift .354
You might try swapping a later 10520 cam only on the intake side and setting it at the Normale factory LC mark which is 111.5. You will need minor jet change likely one size larger main jets.
I have 3 of these that are like new. Too good to use as cores. $ $60.00 each inc shipping
Profile of the 10520 cam is below.

Typical“ CAM PROFILE” OF ALL LOBE SHAPES (USA) FROM FACTORY 1972-1989
10520 03200 00 cam lobe (USA FI cam)
Lift .378 (9.6mm)
.010 348
.020 284°
.040 234°
.050 226°
.100 205°
.150 185°
.200 162°
.300 106°
.350 64°
Richard,
Thanks for responding and including the cam timing tables.
Can you point me to a thread/conversation that illuminates the value of the tables and how to compare different cams.
Thanks!
JIm
 
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