Timing Figures for MD274SP Cam
Turbo Mini Forums

Does anyone have the actual timing figures for the MD274SP?

Kent do not publish the individual inner and outer cylinder figures on the website.

Just need to consider the impact on boost of having a low LSA on the inner cylinders.

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."

here you go paul.
power band 1500 to 6500

cam lift inlet 0.285" ex 0.281"
vlave lift inlet 0.348" ex 0.343"
duration inlet 248 ex 274 deg
timing figures inlet 16/52 ex 71/29
timed in at 108
valve clearence 0.016"

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."

So then you just have to substract these numbers to know the scattering, ie 4° inlets 6 exhaust degrees.§.. 108 outers 112 inners

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."

paul,why have you decided the inners have a different lsa?

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

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."

If I get a chance, I'll set up a test block and measure mine.

Whats the best way to measure cams and plot the data?

the actual timing is advertissed timing less duration :
timing 71+29+180=280° less 274= 6° scattering so exhaust is 71/23, 65/29. same rule for inlets
use this with the in timing you'll find the lsa for in and outers.


16/56= 252°, -248 : 16/52 12/56 so first (outer) cylinder timing:

16/52 in ; 71/23 ex (ie 108lca ;114 lce) 111° lsa

2( inners) cylinder:

12/56 in ; 65/29 ex (ie 112lca;108 lce) 110° lsa.

hope this is clear, (I haven't already took my coffee

That's interesting Fab.

But they quote the inlet timing as 16/52, not 16/56.

Your figure are most likely correct. I hope they are as that spec would be fine for my application.

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."

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."

Yes they quote 16/52 for the sp version, why I used these numbers for inlet number one, the std version (non sp) is 12/56, that's why I used these numbers for inner events as for the exhaust side... 16/56 spread for inlet

Testing out Fab's theory seems to give realistic figures.

I've analysed 4 cams from the yellow bible and the MD274SP.

I just wonder if the inner exhausts should have a bit more duration as this is something that is common with all the others.

EDIT: Got the figures wrong.

EDIT2: This sheet is superseded by the data I got from Kent. See later posts.

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Edited by Paul S on 22nd Sep, 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."

would kent not have this data? would it be worth a phone call? comanies like kent cams are normally very helpful

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 would mail them, they will transfer it to the competent guy which will come back, hope so.

I rang Kent. The guy that answered knew what he was talking about but he was either unwilling or unable to divulge the data for the inner cylinders except that they are ground on a 106 degree LCA.

He confirmed that the data on the web is incorrect and that the timing for the outer cylinders is:

Inlet 16/52, Exhaust 65/29, 108 LCA.

He also said that he would not recommend it for a turbo application.

Then he offered to cut a special on a 112/110 LCA at the normal price

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."

Interesting :)

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

112/110 LCA is that good or not :/

Yes i moved to the darkside

Instagram @jdm_brett

depends what your TIP is.

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."

found this:
MD274SPM Sports Torque
16° 52° 71° 29° 19° 49° 71° 29° 1500/6500 248° 280° 108° 111° 110° 248° 280° 105° 111° 108° 4 7.23 7.13 SCATTER

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."

Schrödinger's cat - so which one am I ???

and could some of that advance be to do with mixture control ,which is addressed by the siamese code anyway ..

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