m60 cam timing improvement

[MonkeyMadness]

So at the end he says its "almost" identical to the M62b44TU timing.
When did bmw adopt Alpina's timing and bring it in house?
Only asking cause I'm running an M62b44 Non-tu out of a 98.
would this benefit me or hinder me?

[BenzoNI]

This may be of interest, guy using M62B44 engine, M60 cams with S62 ITB.

Shows some combinations of timing and inlet track length and what is does to actual HP figures back to back on the Dyno.

Right after some serious messing about with cam timing, inlet trumpet length and 3 sessions on the dyno (over 15 hrs in total) I have some interesting results....

First dyno session she only managed 291hp@6900rpm not great and 275lb/ft@5200rpm still not great, this was with cams set to 109deg peak on both and inlet track length from the head of 200mm....

So back in the garage she went, did some research on M60 cams and the general school of thought is that there is to much valve overlap, so redial the cams...

Second dyno session power was up, good..??? Not really, 321hp@7100rpm, but torque very not good...!!! 255lb/ft@4900rpm, now I should point out at this point that nobody recommends revving the M62 past 6800rpm so this really did concern me and it characteristics of an BMW M3 six I wasn't happy...!!! Also the power was still climbing at 7100 and I chickened out..
The cams where set to 115deg peak on both and same inlet track....

Right so now what...??? I almost give up and pulled the motor.. But I'm no quitter, so back in the garage changed cam timing to 112deg inlet and 110deg exhaust, I also did some research on the inlet track length, the S62 M5 motor sufferers really badly from fitting really short inlet trumpets, so I had already had a set of the BMW original trumpets... So bugger it I fitted the aswell.... This took the inlet track total length from 200mm to 375mm approx...

Third dyno session, happier...?? Yes, sort of.. 357hp@6400rpm and 324lb/ft@5000rpm....

So now I should be happy, right...?? Well it's not the same to drive, it's very cammy, before if you put your foot down it would pull from no revs at all and pull to 6k, now it pulls from low down, not like it did, but if you where used to an M3 you'd be very happy, but in third gear as it goes past 5k (about 80mph) it starts to struggle for grip, even in the dry weather and that's with 245 tyres on it, its very unsettling to drive....😞😞

[Tjabo]

What is that guy saying in the quoted material at the end? That he isn't happy because now he has too much power for his level of traction???

If so, it's not something you usually see people being unhappy about.

[BenzoNI]

What is that guy saying in the quoted material at the end? That he isn't happy because now he has too much power for his level of traction???



If so, it's not something you usually see people being unhappy about.

No it's because the power delivery is different.

He has lost mid range torque.