Mi16 Hydraulic Cam Profiles

[petert 591]

After Sandy published that useful thread on 8V profiles, http://forum.205gtidrivers.com/index.php?showtopic=101413, I thought I should do the same for some of my 16V hydraulic profiles. Note that standard Mi16 and S16 cams are essentially the same, except for minor differences on the opening/closing ramps. Zero is TDC. I've only done half as they're all symmetrical about the centre line. I've also put them on the recommended centre lines so you can see the installed differences.

 

Mi16 - 111 deg. (#3 pulley)

Stage I regrind - 110

Stage I high lift - 108

Stage II regrind - 108

 

If you've got any doubts about the capabilities of the Stage I regrind, have a read of DrSarty's epic thread:

http://forum.205gtidrivers.com/index.php?showtopic=74000

Edited February 21, 2009 by petert

[DrSarty 90 1 Cars]

If you've got any doubts about the capabilities of the Stage I regrind, have a read of DrSarty's epic thread:

http://forum.205gtidrivers.com/index.php?showtopic=74000

 

I'll like to add to this that Peter certainly knows what he's talking about. Of course there are others like Sandy, BlackMi16, Tom Fenton and Anthony to name a few who similarly know their stuff. However they don't sell (I don't think they do anyway) new billet and regrind cams like Pete does; plus it's his thread.

 

I'd also like to repeat that several knowledgable people like Dave Walker at Emerald, have said recently that many people 'over cam' their engines.

 

What I'm saying is, stage III is not necessarily 'better' than stage II or I, as I suppose 10mm lift is not necessarily 'better' than 9mm. It's perhaps more a factor of making the components work in harmony, and it's gotta be true that the cam you use will dictate how your power is delivered.

 

The stage I on mine has seemingly 'amazed' a few people - including me -, as others achieving 200+ BHP engines are using much wilder cams. I'm not saying they're wrong, it's just my perception previously was that bigger and more aggressive is better, when that's not necessarily the case. The stats on my engine seem to show that less can be more.

Edited February 21, 2009 by DrSarty

[Doof 11]

Oh don't say that Sarty, i've gone for Peter's stage 3 high lift jobbies! It'll be interesting to see how mine performs...of course we won't know that for another 600 years because i under estimated what it took to actually build and fit an engine

[DrSarty 90 1 Cars]

Oh don't say that Sarty, i've gone for Peter's stage 3 high lift jobbies! It'll be interesting to see how mine performs...of course we won't know that for another 600 years because i under estimated what it took to actually build and fit an engine

 

You'll get it done, have faith.

 

I did say something like 'not necessarily' above. What I was trying to say was don't under estimate the power of what appears to be a mild regrind.

 

The stage III offers a lot more in terms of lift and duration, which may make everything in your engine scream in delight.

 

But I guess I was also saying it imposes more stresses etc on certain engine components, which if aren't matched/up to the job means you won't get the benefit you thought you would, because you chose to buy stage X because it must be better than stage Y.