nice job AMS great info. subscribed

 

Looks like they were installed at 0/0, not considering the amount of advance/retard that had to be dialed in to get them to exactly 0/0. AFAIK, the amount that the cams had to be degreed for this test would not readily translate to your or my engines.

l8r)

 

+1

 

Awesome Test AMS i can pull my cosi m2's out of my car & send them to you priority mail if you like

no $hit- just say the word & consider them there!....however i may want to try your tomei 280's on 91 octane for $hits & grins

 

Your post is a little misleading. I assume they were not set at 0/0. I think they were set at whatever yielded "straight up". This info would be nice to have. Assuming each manufacturer has tight tolerances in cam to cam manufacturing why would saying X cam was set at -1/+2 (or whatever) to yield "straight up".

Maybe I am missing something or have a misunderstanding of cam timing. If so, please share to expand my knowlege as well as that of the EVO community.

EVOlutionary

 

And a noteworthy point for those who tend to overlook the details . . .

Keep in mind that Martin is NOT using a stock head. A stock head chokes above ~10.5mm lift, and cannot respond to the extra lift of cams like Tomei 280. The cams can only work as well as the head.

 

Can't wait to see what you guys came up with in the GSC S2's....care to share your findings as far as cam timing? I have the AMS head and S2's so I could use a little help

 

why no jun cams in this test... i just bought a set, waiting to be delivered

 

Finally the test!! Im in.

 

Very good and credible testing by the BEST!!!!


Sean

 

What do you mean by choke? Moving into higher L/Ds is not equal to choke.

 

I think he means the head cannot efficiently move the air out with that much lift. It will start to cause back pressure in the cylinders.

 

I like your guys points here.

Martin can you let us know how many cam degrees you typicall needed to adjust to get each cam to the specs of the manufacturer? This would be interesting as an example of the quality control of the cam.

 

Sorry I'm being dumb and don't understand this. Do you mean each manufacturer had different specs for where the centerline should be in terms of crank degrees?

Would love for you to answer the couple questions I just asked and also talk about any other observations you had in terms of the dialing in the cams. Did you try advancing the Tomei intake cam? Would that maybe give a bit better spool?

 

Exactly That's why I like using Jun 272's on a stock head with valvesprings retainers, they don't have big lift but they have a lot of area under the lift curve and good opening and closing ramps. Advertised duration is 272 on the Jun's but the duration at .050" is 225 on the intake and 226 on the exhaust. The HKS 272 (advertised duration) only have 208 on the intake and 206 on the exhaust at .050" The GSC S2's have 217 on intake and exhaust at .050"