Isky and dual pattern cams for 2V

[Anonymous]

Isky think that its easy to remove the need for a dual pattern cam with more duration on the exhaust simply by adding headers and that with the header and a dual pattern its easy to get too much on exhaust and loose torque (as they think dual pattern cams do anyway)
Its interesting that the 2V along with the bigger inlet came with headers as standard. Obviously Ford may have thought that this would be sufficient to even things up and it seems to back up what Iskysay.
After reading what they have to say, a dual pattern cam for a 2V may be fine but I would be a bit reluctant to see the need for it until someone comes up with some solid dynoe figures to support it. They seem to have a fairly solid foundation for saying that dual pattern cams result in loss of torque from experiences taken from Oval track racing. Anyone else heard of this?

 

[Anonymous]

Sorry, Dual pattern cam for a 2V is a good idea (after more searching). Because its possible to keep relatively good vacume and velocity on intake (important for a 2V) and by having more lift duration on the exhaust it will also gain in the higher rpm. An example would be 204/204 at 50 .420 lift 1400-4000 204/214 at 50 420/.440 lift 1500-1500.

 

[StrangeRanger]

Part of what Isky is talking abut isn't just making HP, it's what happens when you lift off the throttle. Dual pattern cams give a bir less engine braking. Totally irrelevant in drag racing, critical to short track, quite useful in road race or auto-x.

Some heads, notably the Ford Windsor are so completely FUBAR'd in the exhaust ports that they need the dual pattern cam to make any power at all. Don't have a clue if this applies to the 2V, but Ford is known for not getting the Exhaust ports quite right.

 

[Anonymous]

Didnt know that it effected the power that way, thanks.
Almost every aftermarket performance cam Ive looked at recently for the Ford V8 Cleveland and Windsor is a dual pattern but not for many of the other brand V8s.
Problem with the 2V is that if the velocity through lack of vacume decreases too much it can cause real problems because of the large inlet ports. Dual pattern cams seem to get the best of both worlds with a bit of a compromise.

 

[Anonymous]

last cam was meant to be 1500 to 4500 rpm 500rpm more just because of more duration and lift on exhaust (others list similar).