M104 ( and similar ) adding cam timing adjuster to exhaust?

[97 SL320]

The next time I bored and have free time. . . . I need to look into adding a intake cam adjuster to the exhaust side. Physically it looks like it just needs a different front cover made or a modified one from a distributor type M104 24 V .

Someone has to have thought about / done this in the past.

[MAG58]

I mean, in theory it would work fine. I haven't checked the oil galley on the exhaust side, I'd want to make sure it's big enough to supply that adjuster (I have no idea if it's different from the intake side).

The only thing I'm concerned about is that from all that I've read on VVT at least with phasing only vvt, is that the intake cam is what alters the lion's share of the power curve while altering the phasing on the exhaust cam is largely for emissions by eliminating overlap, etc. So I guess the question is whether the amount of work is worth the effort?


I'm not one to discourage anything, so I'm all for it, and will help out however possible, but something to consider.

[whipplem104]

I think the biggest problem is, and I would have to double check, is the exhaust cam does not have an opening for the oil to charge the advance mechanism. So you would have to have an intake reground to do this properly. And then you would have to figure out the proper switch point through countless hours of tuning on a dyno.

[97 SL320]

Thanks all, it has been a while since I worked the science of cam duration selection.

I'd think the exhaust cam could be drilled for an oil supply.

Less overlap could be good for a supercharged motor, maybe more at low speed for a turbo motor to get it spooled up.

Someone in Denmark , Sweden , Holland was using an exhaust cam on the intake side in order to get more lift, not sure if they kept the intake adjuster or not.