N/A MG Metro cam profile
Turbo Mini Forums

Just wondering if there is a manufacturer that make a cam with the same profile as the on mentioned in the title?

Thanks
Dan.

My build thread: http://www.turbominis.co.uk/forums/index.php?p=vt&tid=454802

Flickr: http://www.flickr.com/photos/85313398@N02/

Kent do, under the title KC500 I believe.

WWW.TURBO-MINI.COM

There is a Kent cam thats either the same or very close, think it may be a 500?

Thanks chaps.

My build thread: http://www.turbominis.co.uk/forums/index.php?p=vt&tid=454802

Flickr: http://www.flickr.com/photos/85313398@N02/

The sw 05, kent 266 and the MG na can shaft profiles are virtually identical when you compare there lobe profiles.

Own the day

MG

Inlet 252 degrees, LCA 110 degrees, lift 6.68mm
Exhaust 268 degrees, LCA 105 degrees, lift 6.68mm

LSA 107.5 degrees

Overlap 45 degrees



KC500

Inlet 252 degrees, LCA 110 degrees, lift 6.7mm
Exhaust 268 degrees, LCA 105 degrees, lift 6.7mm

LSA 107.5 degres

Overlap 45 degrees



SW5

Inlet 244 degrees, LCA 106 degrees, lift 7.14mm
Exhaust 244 degrees, LCA 110 degrees, lift 7.14mm

LSA 108 degrees

Overlap 28 degrees



MD266

Inlet 260 degrees, LCA 106 degrees, lift 6.68mm
Exhaust 270 degrees, LCA 106 degrees, lift 6.81mm

LSA 106 degrees

Overlap 53 degrees

Edited by Sprocket on 28th Jan, 2012.

and while i'm looking at the data

The Kent MD274 injection cam, is a good choice for turbo aplications with its wide Lobe Seperation angle, short inlet and long exhaust duration and more lift compared to the MD266 and KC500

I know one person on this forum uses one.

MD274 injection

Inlet 248 degrees, LCA 112 degrees, lift 7.23mm
Exhaust 274 degrees, LCA 112 degrees, lift 7.13mm

LSA 112 degres

Overlap 37 degrees

So as a basic spec/theory, what figures are you looking for in the cam specs on paper to highlight it for possible turbo use?

one day boost will be mine!

Many thanks for that Colin, very illuminating. I have a MG NA cam in the car ATM and am building another engine with a Kent 266 - it will be interesting to see if I can detect any difference.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

lobe lift

The KC500, and the MD266 checked with data on the respective web site, and cross refferenced with AC Dodd's information on the ML Motorsorts and double checked on RB racing cam calculator. Swiftunes website looks as though its down at the moment.

The problem is that none of the cams that I've measured actually relate to the quoted values.

Then you get two wildly different sets of figures for the Avonbar PH2 and the reality is somewhere inbetween.

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."

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

yep, 50thou lift can be 50 from the base circle... or from the tappet seting height.. or at the valve... etc

This 50 thou measuring thing came about in the US during the 80s when most cars had hydraulic tappets. It seems to have been adapted throughout the world as the defacto standard, but it was originally concieved as the "give" in the hydraulic tappets before they lifted the valve.

Pffft.....

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."

a useful measurement though, as long as your taking the measurements from the same datum.

True.

I've just dug out my "How to HOTROD Small-block CHEVYS" from 1972. No mention of 0.050" at that time, but they did state that air does not start flowing until 0.015".

Confusion reigns.

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."

Checking height 0.015" Edit** I think Kent's checking height is around 0.0125" judging by Keith Dodd's figures EDIT again**** Nope, kent state 0.016" checking height at the valve, so 0.0125" is at the lobe. Either way, AC Dodds info does seam to at least compare data accurately.

Fact of the matter is that lobe lift is easy to measure, so those figures are accurate. secondly input the valve timing figures into the RB Racing cam calculator and it spits out the exact same duration and LCA's listed in the kent catalogue, suggesting the 0.050" thing is indeed an accepted common value for comparing valve timing.

If the figures quoted in the catalogue do not represent the actual cam you end up with, then that is hardly my fault.

Edited by Sprocket on 28th Jan, 2012.

Ha ha...... you have to use a calculator to work out duration and LCA.

Duration - add the timing figures together and add 180.

LCA - subtract the figures, add 180, then divide by 2.

LSA - Inlet LCA plus Exhaust LCA, then divide by 2.

Simple mental arithmetic.

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."

I don't have the stamina, I was brought up in an age of the calculator

I'm thinking of using the 274 next time the engine is out, just because I have been recommended a cam with 112 lca.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

I've got a 274 for mine Graham.

274 injection sounds tempting to me too.

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

Sorry that my earlier post was a massive generalization but I used the same path for checking my figures. The reason I made the generalization was that on inputting the figures I had for a base cam profile it spat out figures that were somewhere between the sw 05 and kent 266.

It seemed to me at the time that there is a very narrow dimension envelope for a turbo 'A' series cam shaft. I am using the minispeed turbo cam shaft which is a re profiled MG cam shaft. I did ask for the figures but they declined.

Edited by Mr Joshua on 28th Jan, 2012.

Own the day