20v Camshaft ( cam ) durations inlet and exhaust

[Wizard-of-OD]

Redone info

Inlet

AAN, ABY, 3B___ Opens 3° ATDC, closes 25° ABDC, duration 202°, lift 8,3mm
ADU___________ Opens 13° ATDC, closes 35° ABDC, duration 202°, lift 8,3mm?
NM ___________ Opens 0° ATDC, closes 32° ABDC, duration 212°, lift 9,6mm?
7A____________ Opens 6° ATDC, closes 38° ABDC, duration 212°, lift 9,6mm


Exhaust

AAN, ABY, 3B__ Opens 42° BBDC, closes 9° BTDC, duration 213°, lift 8,6mm
ADU__________ Opens 24° BBDC, closes 1° ATDC, duration 205°, lift 9,5mm
NM __________ Opens 35° BBDC, closes 3° BTDC, duration 212°, lift 9,6mm
7A___________ Opens 42° BBDC, closes 3° BTDC, duration 219°, lift 10,5mm

Jamo
did you ever get a decent dyno chart for NM cams?

[Jamo]

Redone info

Inlet

AAN, ABY, 3B___ Opens 3° ATDC, closes 25° ABDC, duration 202°, lift 8,3mm
ADU___________ Opens 13° ATDC, closes 35° ABDC, duration 202°, lift 8,3mm?
NM ___________ Opens 0° ATDC, closes 32° ABDC, duration 212°, lift 9,6mm?
7A____________ Opens 6° ATDC, closes 38° ABDC, duration 212°, lift 9,6mm


Exhaust

AAN, ABY, 3B__ Opens 42° BBDC, closes 9° BTDC, duration 213°, lift 8,6mm
ADU__________ Opens 24° BBDC, closes 1° ATDC, duration 205°, lift 9,5mm
NM __________ Opens 35° BBDC, closes 3° BTDC, duration 212°, lift 9,6mm
7A___________ Opens 42° BBDC, closes 3° BTDC, duration 219°, lift 10,5mm

[Tommy200rs]

Here interesting cam values of the stroker TT RS: 10,7mm and 10mm lift. Cam opening times also here.

[Audi_CQ]

I'll be running both NM inlet and exhaust in my car later this year, hoping for good results.

Keep us posted with results

[Jamo]

The NM (2.0 20v) has the same inlet cam as 7A but 6 degrees advanced (open at 0 close 32ABTC). Could give better low speed torque, but really need a dyno to be sure

Measure cams like this with a degree wheel mounted to the crank:

I'll be running both NM inlet and exhaust in my car later this year, hoping for good results.

[Audi_CQ]

How do you measure the cams ?

The new data means that thers no overlap in the 7a cams.
also the duration is less than what was originally thought b4.
can the inlet cam now be advanced say 6 deg ( with individual cam sprockets ) will this improve low speed torque ? (still no overlap)

Or alternatively what would be the best settings with indivdual adjustable cam sprockets to :
1. maximise hi speed power
2. Maximize low speed torque.
(not related together)

The NM (2.0 20v) has the same inlet cam as 7A but 6 degrees advanced (open at 0 close 32ABTC). Could give better low speed torque, but really need a dyno to be sure

Measure cams like this with a degree wheel mounted to the crank:

[Faheemo]

Faheemo if you want to maximise aceleration than you have to maximise hi rev torque

Understood - What do i need to do WRT advancing or retarding the 7a cams to maximise the acceleration. ( I have adjustable cam sprockets)

Inlet cam data as we now know is :
AAN, ABY, 3B___ Opens 3° ATDC, closes 25° ABDC, duration 202°, lift 8,3mm
ADU___________ Opens 13° ATDC, closes 35° ABDC, duration 202°, lift 8,3mm?
Opens 6° AFTER ATDC, closes 38° ABDC, duration 212°, lift 9,6mm.

All this cam data is confusing me, as i understand it-
ADU Inlet cams are 10deg retarded to give less lag WRT aby,3b cam
7a cam gives more lag due to longer duration higher lift but is retarded 3 deg compared to ABy, 3b ,AAN. ?

can i advance 7a cam to give more hi speed torque.
similarly what can be done to Ex cam to maximise acceleration ?
Not worried about lag.

[Albert]

Faheemo if you want to maximise aceleration than you have to maximise hi rev torque

[Faheemo]

I've measured two sets of cams and they both gave same data as posted earlier:

Inlet:
Opens 6° AFTER(not before) TDC, closes 38° ABDC, duration 212°, lift 9,6mm.
Ex.
Opens 42° BBDC, closes 3° BTDC, duration 219°, lift 10,3mm

Myth busted

Cheers,
Roger

How do you measure the cams ?

The new data means that thers no overlap in the 7a cams.
also the duration is less than what was originally thought b4.
can the inlet cam now be advanced say 6 deg ( with individual cam sprockets ) will this improve low speed torque ? (still no overlap)

Or alternatively what would be the best settings with indivdual adjustable cam sprockets to :
1. maximise hi speed power
2. Maximize low speed torque.
(not related together)

[Audi_CQ]

Gr8 now we have 3 different sets of data for the 7a cams.
Can anyone confirm which data is correct ?

I've measured two sets of cams and they both gave same data as posted earlier:

Inlet:
Opens 6° AFTER(not before) TDC, closes 38° ABDC, duration 212°, lift 9,6mm.
Ex.
Opens 42° BBDC, closes 3° BTDC, duration 219°, lift 10,3mm

Myth busted

Cheers,
Roger

[Flat on my back]

At the moment...

This was the actual measuered data on the 7a cam

Inlet:
Opens 6° AFTER(not before) TDC, closes 38° ABDC, duration 212°, lift 9,6mm.

Thanks Audi CQ

[Faheemo]

Gr8 now we have 3 different sets of data for the 7a cams.
Can anyone confirm which data is correct ?

[Flat on my back]

Very well done that man...

Lets hope it was just a 'typo' in the Bentley.

Or do we need to confirm the data for the other cams with a real world check and not just believe the books!

[Audi_CQ]

Update on 7A cam data:

I've posted in an earlier thread that when measuring 7A cams I found that numbers for inlet cam also was wrong. Measured a friends setup today and 7A cams is as follows:

Inlet:
Opens 6° AFTER(not before) TDC, closes 38° ABDC, duration 212°, lift 9,6mm.
Ex.
Opens 42° BBDC, closes 3° BTDC, duration 219°, lift 10,3mm

Also found this on the Norwegian VAG club forum:

3B/RR/ABY/AAN Steuerzeiten:
* Einlass öffnet nach OT 3 Grad
* Einlass schließt nach UT 25 Grad
* Auslass öffnet vor UT 42,2 Grad
* Auslass schließt vor OT 9,2 Grad
* Hub Einlass: 8,3mm
* Hub Auslass: 8,8mm

Steuerzeiten ADU:
* Einlass öffnet nach OT 13 Grad
* Einlass schließt nach UT 35 Grad
* Auslass öffnet vor UT 24 Grad
* Auslass schließt vor OT 1 Grad
* Hub Einlass: 8,3mm
* Hub Auslass: 9,5mm

Steuerzeiten 7A:
* Einlass öffnet nach OT 6 Grad
* Einlass schließt nach UT 38 Grad
* Auslass öffnet vor UT 42 Grad
* Auslass schließt vor OT 3 Grad
* Hub Einlass: 10,2mm
* Hub Auslass: 9,6mm

So 7A inlet isn't so much different from the turbo cams

Cheers,
Roger

[Albert]