i was reading the "offical h22a cam thread" when i saw that some one said that h22 cams have "primary" "mid" and "secondary" intake lobes?

what exectly dose that mean why dose the h23 and f22 only have a primary?

is there "primary" "mid" and "secondary" exhuast lobes as well?

sorry for not posting there; i didnt feel like the question belonged in that thread b.c its more of a "this cam made xxx power and this is my expericence with these perticular cams"

thanks if you can just clear me upguys

 

any one?

 

I'm not 100% clear on this either, but it's the "low" and "high" parts of VTEC (which is why h23's don't have them, because they're not VTEC). I believe the "mid" is a short transition period between the two when VTEC engages, if I'm not mistaken. And yes, the exhaust cam has the same set of lobes.

 

I will try to explain this the best I can.

So there are 3 lobes for 2 vlaves.
There are 2 valves running Which before vtec run off of two different lobes (primary and mid I believe). The reason for this is one is a bit bigger then the other and opens one vlave more than the other. This causes a swirling air effect which is better for lower rpms creates a better burn so you get better efficentcy.

Then when vtec activates both valves are run one lobe(Secondary).

Hope that helps

 

Outside of VTEC each valve is driven by a cam lobe. (Primary and Secondary). These are the "low cam" lobes. They're not necessarily the same.

In VTEC both valves on each side are driven by the same cam lobe (Mid). This is the "high cam" lobe.

 

There you go I got the mid and secondary mixed up.

 

ok i think i got you if i put both of the info together. but correct me if im wrong. my understanding is ;


the primary and secondary are slightly different to cause the sprial effect in the combustion chamber= better efficiency


and the mid would be the vtec lobe and when engaged it lifts them both vavles (higher then the primary and secondary) (but at the same time)= vavles open longer=more air= bigger combustion


correct?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lrayford &raquo;</TD></TR><TR><TD CLASS="quote">ok i think i got you if i put both of the info together. but correct me if im wrong. my understanding is ;


the primary and secondary are slightly different to cause the sprial effect in the combustion chamber= better efficiency


and the mid would be the vtec lobe and when engaged it lifts them both vavles (higher then the primary and secondary) (but at the same time)= vavles open longer=more air= bigger combustion


correct? </TD></TR></TABLE>