7a cam timing

[prking53]

hi im new to this lark ,..............can anyone tell me if the 7a cams need to be timed differrant to the standard cam on the 3b engine ?..... .i have put the inlet/exhaust cams on my audi s2 turbo which has the 3b lump and kept the same timing.........is it ok ................. it seems to be a little rough at 20,000 rev,s

[HPmuirt]

it seems to be a little rough at 20,000 rev,s

At 20,000rpm, you are 1,000rpm of the the limit of F1 cars so no wonder it is 'a little rough'

Cheers n

Si

[urquattro-island]

Hi

new to this also, but did you change both?? Is there not a mark on the two, and if they are on their marks, this should be right?? I think so??

[4WheelDrifter]

hi im new to this lark ,..............can anyone tell me if the 7a cams need to be timed differrant to the standard cam on the 3b engine ?..... .i have put the inlet/exhaust cams on my audi s2 turbo which has the 3b lump and kept the same timing.........is it ok ................. it seems to be a little rough at 20,000 rev,s

The 7A cams don't need to be timed differently.

[prosty]

Same as stock! Very important!

[prking53]

faster than an f1

yer i see what u mean .............20,000 rev,s ...................what about 2000, revs and a little rough......................prki

[Knight Rider S4]

recognise the name..did you sell that 5 branch manifold?

[prking53]

what. bhp................?

still have it night rider..............can u advise me ...?,...............what bhp can i expect from 1991 s2 tubo b4 lump ... with bmc induction /performance exhaust no cat.. 7a cams rs2 standard manifold ..rs2 k26 turbo ..............not remaped..yet

[Billman]

max 380 or so.

[prosty]

I would only use the 7a exhaust cam, unless you want to zip your coffee each time you wait for the turbo to spool

[Jamo]

I would only use the 7a exhaust cam, unless you want to zip your coffee each time you wait for the turbo to spool

Why do you say that? I have a 7A inlet with 7A exhaust and it seems fine.

[philip walker]

Why do you say that? I have a 7A inlet with 7A exhaust and it seems fine.

To much duration, not ideal for a forced induction engine. Better off with some shorter duration cams with plenty of lift.

[Knight Rider S4]

still have it night rider..............can u advise me ...?,...............what bhp can i expect from 1991 s2 tubo b4 lump ... with bmc induction /performance exhaust no cat.. 7a cams rs2 standard manifold ..rs2 k26 turbo ..............not remaped..yet

Could you Pm what you are wanting for the 5 branch

Cheers

[prking53]

5 branch exhaust

hi im looking 4 £75.............................cheers prk53

[Audi_CQ]

To much duration, not ideal for a forced induction engine. Better off with some shorter duration cams with plenty of lift.

It all depends on the setup of rest of engine......
A couple of good questions is:
- why isn't the extra duration ideal for a forced induction engine ?
- what can be done to the engine setup to make use of the potensial the extra cam duration gives?



Cheers,
Roger