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Old 09-11-2012, 07:14 PM   #1
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cam gear questions

ok so i have adj cam gears, the 5 bolt style ones and was wondering. are they really worth the headache of putting on and getting timed correctly? i feel as if i put them on that the car will never be the same as far as the timing goes and i dont feel like having my car out of commission due to timing issues. can anyone give me any insight on these and weather or not they are worth and yes i have the timing bar that goes with them.


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Old 09-11-2012, 10:20 PM   #2
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As far as i know they help with performance as well not just getting your car timed correctly im planning on getting some soon just soo i can go faster woot not much power but we have zetecs so we need all we can get am i right haha
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Old 09-12-2012, 02:29 AM   #3
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They may provide a little benefit on stock but not much. They mainly help to tune when you get performance cams. Either way to achieve their real benefit will require you to get them tuned on a dyno by a shop that goods at tuning. Otherwise putting them on is a waste of time and money.
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Old 09-12-2012, 06:48 AM   #4
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Thats what i was worried about...hmm, well i guess bst section i go, thanks guys
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Old 09-12-2012, 06:14 PM   #5
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The intention of adj. cam gears is to tailor the cams to your driving style/needs/wants.

As RPM changes so do the air flow dynamics of the engine. As RPM increases so does intake air velocity, or required velocity for complete cylinder filling. Things like overlap can have an impact on higher RPM power, more overlap can result in more power.

On a basically stock engine that is predominantly a DD, they aren't needed. But if you have them and get them tuned you can have a schizophrenic DD/track car.

Will they add power alone, no.
Can you gain power with them, some in certain RPM ranges.
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Old 09-12-2012, 06:28 PM   #6
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Cam Gears do improve power even with stock cams. If you've upgraded the intake and exhaust you will get even more power. But you have to do it right and have a dyno tune. So this should probably not be done til you've got all the other basic bolt ons.

If I remember correctly the zetec works best with 0 degree adjustment on the Exhaust Cam and almost -5 degrees on the Intake Cam.

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Old 09-12-2012, 08:10 PM   #7
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Quote:
Originally Posted by steeda423 View Post
Cam Gears do improve power even with stock cams. If you've upgraded the intake and exhaust you will get even more power. But you have to do it right and have a dyno tune. So this should probably not be done til you've got all the other basic bolt ons.

If I remember correctly the zetec works best with 0 degree adjustment on the Exhaust Cam and almost -5 degrees on the Intake Cam.

Please quite posting that engine picture with every post you make.





Cam degrees/bold text - Vs what?

All and I really mean all of the dyno's, literature and talks about what cam time makes the best power or move what to where are purely opinion.
It's well known that mechanical variance from the factory can result in cam timing being off slightly from the factory. And to illustrate what kind of tolerances I'm talking:

Crankshaft Degree - Piston Movement in Inches
1 ....................... 0.000349"
2 ....................... 0.001396"
3 ....................... 0.003141"
4 ....................... 0.005582"
5 ....................... 0.008719"

Now keep in mind that 1 crankshaft degree is equal to 1/2 a camshaft degree. Or in other words, on an assembled engine if the cam timing is off 2 it will result in the piston being 0.000349" off where it should be.
The numbers make it look trivial but when at speed everything matters. Variances are compounded as piston speed changes throughout the stroke.

What I am saying is that W/O there being a set standard for factory timing alignment there is no way to advise someone on what is best practice for cam timing.
Now if we had factory cam gears that had pins locking the cam gears in place we could say '+2 intake and -3 exhaust will make more power above 4,000 rpm'.
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Old 09-12-2012, 08:21 PM   #8
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Quote:
there is no way to advise someone on what is best practice for cam timing

You're right this was my advise..

Quote:
But you have to do it right and have a dyno tune.
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Old 09-12-2012, 08:25 PM   #9
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A dyno tune isn't the best option either.
With no changes at all I've made up to 5hp difference with my car on a dyno doing back to back runs.
The 0-100hp differences you see in dyno's can easily be attributed to error, or margin of error.
It's something that has to be taken into account at all times.
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Old 09-13-2012, 02:54 AM   #10
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I had adj. cam gears on my stock cams with fantastic results after dyno tuning. With my butt dyno I was way way way off. Also you can't just say put the exhaust cam to this and the intake cam set to this. It doesn't work that way on a zetec, maybe a honda where the cam gears are indexed to the cam with key ways. On a zetec the timing can vary greatly between motors. Here is a link to Sport Compact Car's project focus they had way back in the day when they were around HERE. You can see that the gains from the cam gears and other mods. In my opinion cam gears are worth it, but only worth it if you get them dyno tuned. Now if I can only afford to get my cams I have now dyno tuned again
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