Difference in M10 and M40 cams???

[volgapower]

is there any difference between M10 and M40 camshafts???

and one more, i want to install an aftermaket preformance cam, and which one you suggest for a better performance???

[Rocla]

is there any difference between M10 and M40 camshafts???

and one more, i want to install an aftermaket preformance cam, and which one you suggest for a better performance???

You should rather ask what are the similarities.

Only part that is interchangeable is crankshaft rear oil seal and maybe some bolts, everything else is different and they can't be combined.

[M42Stephen]

Is an M40 a single cam?

[Stu]

You should rather ask what are the similarities.

Only part that is interchangeable is crankshaft rear oil seal and maybe some bolts, everything else is different and they can't be combined.

You sure? I was under the impression the M40 runs the same dimensions (cylinder spacing, etc) as the M42. If so, the M40 crank would be about 2.5" shorter than an M10 crank.

[volgapower]

OK and whick cam would you recommend me on my M10 for performance???

[Rocla]

You sure? I was under the impression the M40 runs the same dimensions (cylinder spacing, etc) as the M42. If so, the M40 crank would be about 2.5" shorter than an M10 crank.

Yes I'm sure. Never said that CRANK could be swapped, but the real oil seal on crank.

Oil seal has same dimensions on virtualy all old BMW engines.

M40 and M42 bottom ends are nearly identical, as you said, While M10 virtualy has nothing on common.

[Stu]

Yes I'm sure. Never said that CRANK could be swapped, but the real oil seal on crank.

Oil seal has same dimensions on virtualy all old BMW engines.

M40 and M42 bottom ends are nearly identical, as you said, While M10 virtualy has nothing on common.

Sorry I misread your first post!

[volgapower]

and which aftermarkt camshaft would you recomend me for my M10 318i for performance?

[Rocla]

and which aftermarkt camshaft would you recomend me for my M10 318i for performance?

I have Dr. Shrick "272" on my both engines, I've been pleased with them, engine runs good idle and passes smog test.

My older engines had ~40kkm, and I discovered that one lobe on cam had severe wear, I believe that I had lubrication promblem.

[volgapower]

"272" ok thanks and how about a higher index... and what do they mean?

[Rocla]

"272" ok thanks and how about a higher index... and what do they mean?

The number means how many degrees on CRANKshaft the valves are open.

Higher the number, on higher RPM the torque will be. I've heard that many Finnish M10 builders had problems with smog test using 292 deg. shrciks cams.

[volgapower]

smog test is no problem, we have no law on exaust restrictions :)

and if i run 292 or 304 will i have any problems? what else will i need to change? (such as valves, valve springs etc... )

[Rocla]

smog test is no problem, we have no law on exaust restrictions :)

and if i run 292 or 304 will i have any problems? what else will i need to change? (such as valves, valve springs etc... )

Check if your injection has internal rpm limiter, if it has, your engine will rev lik 6500 rpm and there is no performance gain when those radical cams start to work well after like 5500 rpm.

If your engine has limiter only on distributor you might use cam with more duration, but with stock 318i bottom end reving m10 over 7000rpm is quite risky.

A cam with too muscj duration makes(especially with small engine) everyday use to pain in the ass.

= more duration(=degrees on cam) less torque on low rpm. When you move torque pan upper with cam, the torque area comes more narrow and you'll need to use right rpm or your car will studder and hesitate.

[euroshark]

The M10 has more similarities to the M30 than it does to the M40, since it's basically a chopped M30. I have seen some aftermarket distributors that might make a nice difference... Not a lot of power, but it all helps.

[volgapower]

ok i got it thanks...
what other mods are available for this engine???
i want it to be N/A...

we have a drag racing 8V class till 1900cc (my class) and i want to win that next year... most participating cars are stock or with few mods