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DURATEC Performance (2003-2007) The place to chat about any Duratec 23, 23E, and 20 engine performance, tuning and exhaust related upgrades.

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Old 03-09-2014, 03:01 PM   #11
infraredst
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Thanks for all the great info. As far as brand I was originally thinking cosworth, but will definitely be researching the crane.
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Old 03-09-2014, 03:13 PM   #12
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Quote:
Originally Posted by infraredst View Post
Thanks for all the great info. As far as brand I was originally thinking cosworth, but will definitely be researching the crane.
I beleive the cossie's are single pattern cams, instead of split pattern cams, that crane & crower use. Plus their like $600. to $300.-$400.
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Old 03-09-2014, 10:20 PM   #13
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Quote:
Originally Posted by elsolo View Post
Generalization on cams:

All aftermarket performance cams have increased duration, the valves are open longer. This improves performance at middle-upper RPMS, and negatively effects low RPM efficiency.

Depending on how much duration, when the intake valve closes, and how much intake/exhaust valve overlap, bigger cams can be outright pigs at low RPM's with such terrible inefficiency that the engine will barely idle and pull very little manifold vacuum. Bigger cams are not always better, it really is a fine tuning tool based on ALL the other factors of the combination.

The cam in my big block chevelle only makes 5" vacuum at 1000 rpm idle, and is pretty inefficient below 3000 rpm. Fortunately that engine is over 8 liters displacement, so it has some low rpm torque to spare, but wouldn't work worth a crap without a 3000+ converter.
I learned a lot there thank you.

Quote:
personally think going stage 2 would be better. I just read a few post about another member not being happy with his stage 1's and tune.
I know you need upgraded valve springs but I have also read you need piston reliefs. Does this mean I would have to mess with the bottom end as well? Sorry for my lack of knowledge still learning lol. I like stage 1's just being bolt on and go. I have seen stage 2 Focus videos in action and they are definitely screamers. I just don't wanna pull a head lol.

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Thanks for all the great info. As far as brand I was originally thinking cosworth, but will definitely be researching the crane.
Nice.
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Old 03-09-2014, 11:18 PM   #14
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One more generalization:
If you are trying to decide between two cams, pick the smaller one, you will be happier most of the time.
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