Exhaust cam put in intake m50nv?

[JGood]

My car made 685 rwhp with completely 100% stock M50 non vanos head, so I think BMW did a good job on the cam selection.

Not everyone wants to, or can afford to, reliably boost the shit out of their engine. So swapping cams can be a cost efficient way to get more power from an otherwise stock engine.

[5mall5nail5]

Makes little to no difference. I'd be interested to see a consistent dyno gain by it.

[JGood]

Makes little to no difference. I'd be interested to see a consistent dyno gain by it.

I'm not familiar with that particular cam swap, but the s50 cam swap on my m50 made a huge difference. If it's not a noticeable gain like that, then I suppose you're right.

[5mall5nail5]

I don't think it'd be noticeable at all really it will shift the curve to the left and maybe make a couple more hp but that means tq hurts. That, and since the cams don't line up you have to degree them in and that always leaves for some excitement on first turn over.

[nando]

cams do not simply shift the curve to the right (I think you meant right, not left). they *can* shift them to the right, but it's way more than that. They will be more open at TDC, have more peak lift, more peak duration, etc. etc. It increase VE, not just shifting it around.

timing, however, will merely shift the curve left/right.

[5mall5nail5]

I meant right - more duration shifts the curve to the right, always. This is because you lose low end torque. Horsepower is "gained" because torque is maintained up the rev range (horsepower derived (torque * rpm)/5252. If you make 250 ft lb of torque at 4500 RPM you have 214 hp at that point. If torque falls off to 220 ft lb by 7000 RPM then engine is making 293 hp at that RPM. Stock cams, torque falls off as engine RPM goes up - so what you get with more duration is a shift to the right. Torque falls later in the range, but will likely be maintained better to red line, so if you were dropping to 220 ft lb by 7000, but now you can hold 235 ft lb to 7000 you now have a 313 hp motor. You didn't make "more" torque - you just didn't fall off so bad up top - the car still likely peaks more torque on the stock cams but fall off in RPM - result is a shift to the right.

[Mr.SWISS]

Not that I know of. Makes no sense to do that, you will lose power. Cheap upgrade for Non vanos car is to get another non vanos intake camshaft and put it on the exhaust side, this way you will have a duration of 240 and lift of 9.7 on both sides, this puts you closer to the S50 camshaft specifications.

Yes. the intake is hotter not the exhaust. They also need to be dialed in manually. The cam blocks will not be accurate to time them.

[nando]

I meant right - more duration shifts the curve to the right, always. This is because you lose low end torque. Horsepower is "gained" because torque is maintained up the rev range (horsepower derived (torque * rpm)/5252. If you make 250 ft lb of torque at 4500 RPM you have 214 hp at that point. If torque falls off to 220 ft lb by 7000 RPM then engine is making 293 hp at that RPM. Stock cams, torque falls off as engine RPM goes up - so what you get with more duration is a shift to the right. Torque falls later in the range, but will likely be maintained better to red line, so if you were dropping to 220 ft lb by 7000, but now you can hold 235 ft lb to 7000 you now have a 313 hp motor. You didn't make "more" torque - you just didn't fall off so bad up top - the car still likely peaks more torque on the stock cams but fall off in RPM - result is a shift to the right.

uhm, it doesn't work that way. VE is directly related to torque - you can't increase VE, and horsepower, and not increase torque. It's also not neccesarily true that more lift/duration leads to a torque loss in the low end. That depends a lot on lobe seperation, which is why vanos is such a big deal.

[shiboujin]

You dare challenge JonK!?

[nando]

I don't know who JonK is, nor do I care. :p

[shiboujin]

Jonk == 5mall5nail5

I've been licking his nut sack for years now. He doesn't like them dry.

[nando]

I bet he doesn't approve of your wiring harness. :p

[shiboujin]

Oh hey, you know how to make a high school comeback and thus further derail a thread. Congrats!

[samiam3356]

Yoshi at his best......taking a thread off topic

[M-technik-3]

Do a google search on Pete Mchenry, he did many M/S5X variants.