41 replies to this topic

[Chris M]

Has anyone used the mini Spares EVOLUTION001 camshaft?
Seems good value for money if it’s suitable?

[Wiggy]

You basically have a choice of SW5 or 274. There's probably 1 or 2 more. You can't get it through the emission test with anything hotter. And you MUST have an injection specific cam with a pickup for the sensor.

[Wiggy]

I've mentioned it before but, my S Pack MPi was pretty dead torque wise below 3k rpm. Probably because of the 1.5:1 rockers pushing the power band higher. Fitting the 274i transformed the drivability of the car. I was over the moon with it.

[clem_c]

Hi,

 

I have fitted a kent 274i to my SPi standard engine last year, it does change the way the engine responds, I do feel a nice improvement in torque.

Definitely something to do while your engine is out, in my opinion.

 

I have found this very interesting document, detailling how the engine management works on SPi and MPi cars :

https://www.sevener...._Rover_MEMS.pdf

 

in page 14.3, in the chapter Signal Processing:

"The basic AFR is also stored in a threedimensional map, and the engine load and speed signals determine the basic injection pulse value. Using the speed/density method, MEMS calculates the AFR from the pressure in the inlet manifold (MAP) and the speed of the engine (CAS).

This method relies on the theory that the engine will draw in a fixed volume of air per revolution. The AFR and the pulse duration are then corrected on reference to ATS, CTS, battery voltage and rate of throttle opening (TPS)"

 

This helped me to understand how the AFR is set.

This also helped me to understand why it is so important to keep the small hose running from the inlet manifold to the fuel trap and to the MAP sensor inside the ECM. (this is now an other topic...)

 

Cheers,

Clement.

[Chris M]

Am I right in saying that a standard MPI head has 33mm & 29mm valves?
I’ve been offered a head with 35mm & 29mm valves & lightly ported. Would this be classed as a stage 1 or 2?
Thinking of adding it to my engine either with a cam or 1:5 rockers.

[Wiggy]

'Stages' mean different things to different people. But in Minispares parlance, that would be a Stage 2. It'll need to be an MPi casting though, I believe.

 

Fit an LCB and the rockers, and you've basically got the JC Works pack.

[Chris M]

Thanks Wiggy?
That’s exactly what I thought & had in mind.

[Bobbins]

The MPi cylinder head has the extra mounting points below the thermostat housing for the alternator bracket.

 

 

Attached Files

•  MPi cylinder head.JPG   42.92K   1 downloads

[Chris M]

I’ve decided to fit Kent cam. But how easy are they to install/set up?
Don’t they have to be timed up?
Any advise or guidance would be great ?

[Wiggy]

You'll need a DTI and a timing wheel.

You can either use an adjustable duplex timing gear, or retain the standard timing chain and use a offset woodruff key.

The actual process of timing in the cam isn't hard per se. Just fiddly. I have a couple of tips, but you're better off watching some YouTube videos and getting it straight in your head, as to exactly what you're doing first.

[Bobbins]

Does anyone use the “lift at TDC” method for timing cams? It’s the method I use on my K-Series (not Mini) and is much easier than messing trying to set an angle.

[Chris M]

I’ve spoken with mini sports today & they recommend a CAMMP2 camshaft that is one of their own. It’s a fast road cam.
I wounding if anyone has any experience of this cam?

[Midas Mk1]

£230 for a lesser, reground Cam, £20 more, an arguable better new billet cam, followers and pump..

 

People go on about swifty cams, and having ran a sw5 and sw10 I know why..

 

https://swiftune.com...ld-kit-101.html

Edited by Midas Mk1, 13 February 2019 - 01:03 PM.

[Wiggy]

It's £270 for the SW5 kit for MPi. But the same logic applies.

274i plus followers and pump is comparible on price.

I believe the 274i is slightly more aggressive than the SW5.

Minisport are gonna recommend their own cam really, aren't they.

[Chris M]

It's £270 for the SW5 kit for MPi. But the same logic applies.

274i plus followers and pump is comparible on price.

I believe the 274i is slightly more aggressive than the SW5.

Minisport are gonna recommend their own cam really, aren't they.

 

So undersides on which one to go for. I don't want to make a mistake. 

As you say Wiggy Minisport are going to recomend their own. I was after a price of a Kent cam kit from them but they say Kent don't make a cam for a MPI?