MPi Cam Data
Turbo Mini Forums

Big thanks to Andy for lending me his Mpi cam.

I've now measured it and also a 998 A+ cam.



I put them in a block with lifter and pushrod, DTI on the pushrod. Measured the angle of the cam with a degree wheel bolted to the end of the cam. So all angles are in cam degrees, not crank.

They are both set on a 107.5 degrees LSA by the looks of it.

Lift plus clearance is 6.7mm on inlet and outlet on the MPi, compared to 6.4/6.7 on the 998.

Now the durations are a bit tricky as it depends where you measure it. I've noted the duration at 15 thou or 0.375mm as follows:

MPi Exh - 264 Deg
MPi Inl - 256 Deg
998 Exh - 248 Deg
998 Inl - 238 Deg

The 998 cam is from one of the late 80s engines 99HE20 with high compression and rated at 45hp, so probably is the 230/240 998 Metro cam.

The MPi looks like a bit of a hybrid. It is supposed to be 238/252 but it looks more than that.

Edited by Paul S on 8th Oct, 2010.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

That's interesting. VmaxScart sells a 265 cam for mild supercharged applications. The one pictured on his website has the split lobe for the cam sensor/mechanical fuel pump and looks very much like an MPi cam.

The return for my generosity is that you stop hating metros

So in conclusion Paul do you have an opinion on this cam for forced induction? Small bore or otherwise?

If something is worth doing, it's worth doing half of.

On 8th Oct, 2010 apbellamy said:
The return for my generosity is that you stop hating metros

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Have you got one?

If something is worth doing, it's worth doing half of.

No.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Me & Andy may be able to let you borrow the van's over the xmas.

If something is worth doing, it's worth doing half of.

i might have one kicking about if its of any use

1972 998 TURBO SLEEPER

Isn't the MG cam the same profile etc as the old cooper s ?

Surely this would be well documented somewhere, I mean to save the hassle of measuring :)

Something in vizard may be or I may be I'm missing the point

Edited by Brocky on 8th Oct, 2010.

BTW - I took my buddy VTEC Pete out for a spin this weekend, and even though I am running her in, he gave it a name, the "Brocket"...cause I'm a brocket maaannn, nah nah nah nah nah nah nah nah nah nah nah....

Build thread - http://www.turbominis.co.uk/forums/index.php?p=vt&tid=7483

Katy Mini Owners Club Thread - http://www.turbominis.co.uk/forums/index.php?p=vt&tid=505552

Let's make sure you embarrass at least one VTEC MINI today !

https://www.facebook.com/groups/17557298589...096464253807802

mg metro is a cross between 948 cooper 252° inlet ( a highly rated a-serie profile) with 731 exhaust camsaft(leylanf fast road profile also highly rated).
The mpi cam is more a like a modern aeg 510 cam (cooper s 1275 gt one).
again Paul sometimes, all cannot be mesure calculated, test it and you'll see.

The point of measuring it was to see if Rover had changed the cam profiles for the MPi. They may have improved the ramps etc to give a bit more area under the curve. My measurements show that they did not, but just used earlier profiles.

I just can't help feeling that it is just a bit too mild for what I'm looking for.

I could just use the MG Metro cam as it is well proven in a 998 Turbo, but there may be a better alternative. It's not the MPi cam in my opinion.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Hard to see from the scaling of the graph Paul, but it does look like there are some changes to the lift ramps. A zoomed in graph of the lift from the seat area, with the usual valve lash marked as a horizontal line will tell us more?

Tom, the on ramps are slighly different but will not help flow much at all.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

But surely the reduction in overlap is significant, when the valve clearances are taken into account?