I've always thought that cams with a lot of built in overlap have really good top-end power and not so much down low.Going from this what is the purpose of having large primary and secondary lobes on the Toda B's when it is "The nature of the Beast" on Hondas to make all of their top end power on the Vtech lobe?Would larger primary and secondary lobes really make you get to that Vtech lobe quicker?Or am I completely wrong about the B's?


[Modified by blazin, 12:05 PM 1/6/2002]


[Modified by blazin, 12:07 PM 1/6/2002]

 

B's are famed for their low/mid performance gain. Becuase of simliarity between the A and B cam vtec lobes, those two can be and usually are comparable at peak...

Now, C's are a different story

 

What are the benefits off having such large lobes


brighter CEL

 

Nice Yack....
"Toda Cams in 3 Options"
"Bright CEL"
"Brighter CEL"
"Brightest CEL"

Jason

 

honda's suck why would you put 1000 dollar cams when you could buy a 5.slow for that price? probably not running though!! so i see the point now of nice big meaty cams!

 

LOL

 

So did anyone know the real answer for this? I would like to know too, since the biggest different between JUN 3 and Toda B to me is the differences in their primary and secondary lobes.

 

I think the biggest benefit (and the most obvious one) woulb be to give you more torque at lower RPM. If you drove your ITR on the track (or spiritively on the street) and had to drop out of the 6000 rpm zone you know that the engine is laking the "oumph" needed to keep you going. With the bigger lobs and good tuning the torque gain will help you even if not in vtec.

 

But what I think is that if bigger primary and secondary lobes mean more power down low and midrange, then ppl with stock cams can set the VTEC kick in at like 3000rpm and make more power. But the fact is that too low of VTEC switch over will make you loss power even on stock cams!!

 

great mid. range power and pulls all the way to the top end....vtec

 

What you arent taking into account are the duration specs.

 

I'm an ignorant about secondary lobes on a cam, but what it has to do with your CEL? Don't they make your head breath more at mid/top range too?

 

LOL
hahahahaha

FYI, there are 3 lobes, labeled primary, secondary, and vtec.

 

SGT: Correct me if I'm wrong; Primary lobe=Intake, Secondary lobe=Exhaust, Vtec lobe= More breathing in intake valves at top end when Vtec valve engages

 

There are 3 lobes per 2 valves. They are setup in the following configuration:

Pri | VTEC | Sec
valve | valve

on low rpm operation, the primary and secondary lobes drive the valves
directly. When vtec engages, the vtec lobe drives both valves.

 

Silly me, I was thinking of Vtec single overhead cam head...

 

even with SOHC, its the same setup on the intake side.
The exhaust side just has no vtec.

 

So what would be the benefits of the Spec B's in these situations?
Road racing=with 2 equal motors,cars, & drivers
Drag/street racing= with 2 equal motors,cars, & drivers

 

Road racing = Sucking everyone up through the twisties

Seriously, the low/mid gain helps to compensate with the famed lack of torque coming out of the turns...

Jason- who thinks drag racing is boring, and loves sucking the V-8 beasts up at turn 3 of VIR


[Modified by Darth VadeR, 6:22 AM 1/7/2002]