Exhaust Cam choices

[martinjs]

so can you get more improvements fitting the 7a inlet cam also?

[s2driveruk]

Mark,

Take a look at this - they have a 90 in for breaking.....

http://www.vw-audi-specialists.co.uk/now-breaking.html

Cheers,

David

[Audi Parts Guru]

If you're fitting a new or used camshaft it is always advisable to fit new cam followers at the same time !!!

[Sweeper]

There is a .xls file with Duration comparing 3B,7A,ADU and NM cams. In files section on Krummer List.

Called something like 20_cams_2.xls

[Audi Parts Guru]

Originally posted by Sweeper
There is a .xls file with Duration comparing 3B,7A,ADU and NM cams. In files section on Krummer List.

Called something like 20_cams_2.xls

Have you got the link for this ?

[Sweeper]

Here you go


Cams file .XLS

There are also adjustable cam wheels adn s.o.

Go to www.yahoogroups.com them input Kruemmer and join the list if you want to access files section later.

I doesn't require to have account/join one to view the link i've posted.

[Audi Parts Guru]

Originally posted by Sweeper
Here you go


Cams file .XLS

There are also adjustable cam wheels adn s.o.

Go to www.yahoogroups.com them input Kruemmer and join the list if you want to access files section later.

I doesn't require to have account/join one to view the link i've posted.

Cheers Sweeper....it certainly makes for some interesting reading,assuming that it's accurate of course

[Pisobiker]

Originally posted by Audi Parts Guru
Cam duration refers to how long a valve is opened in relation to crankshaft rotation.

Cam timing refers to when a valve opens and closes in relation to crankshaft rotation

Yeah, thats right, so it comes by itself that if you raise duration you are making valves stay open more time (you can do that making them open earlyer, or making them open earlyer+close later, or making them close later.
Which exactly means you're changing "timing".

Marco

[Pisobiker]

Just saw the .xls file. Very interesting.

I've noticed that using the 7A ex-cam with 3B-ABY-ADU in-cam there are + 10° between exhaust closing and intake opening (12° vs 22°) while also using 7A intake cam will only be 3° (but still not overlapping).
Would be interesting, using any connections some of you may have around tuners, to find out if there could also be an advantage on using the 7A intake cam as well, and how the advanced timing (and the +5° of closing retard) would affect performances (but how much is 7A intake cam lift?)

Marco