Intense 1X cam w/ 1.9 Rockers? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-05-2007, 05:01 PM   #11
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Thank you SilverBullet. You are right about the engine swap. Im just studing my options.
Here in Puerto Rico the engine with trans., computer, & harness woud be about 3 or 4K.
because parts here are super expensive. But labor is way cheaper than in the US. So you see, I have to reaserch my options with the engine I have. If I cant get the type of power I want with it, then Ill think about replacing it.

Ok, back to topic.
Todd, you say that nobody has done it. This is because is not worth it rigth?
Im guessing you spend all this money for heads & cam & stuff. & still not reach the power of a sc engine. right?
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Old 10-05-2007, 05:11 PM   #12
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Quote:
Originally Posted by petraman
Just in general... doesn't have to be NA or Boosted...

So, would it be beneficial to run a custom grind cam with 1.9s as opposed to a stage 3 cam?
Thats called the stock cam
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Old 10-05-2007, 05:14 PM   #13
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Quote:
Originally Posted by alexcoqui
Todd, you say that nobody has done it. This is because is not worth it rigth?
Im guessing you spend all this money for heads & cam & stuff. & still not reach the power of a sc engine. right?
Correct. If you want to make good power with an N/A you want to put a turbo on it

Stock heads, stock cam, stock block, good intercooler, good power
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Old 10-05-2007, 06:37 PM   #14
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Run 1.9 rockers, but you would need what is called a "Lift-Rule" cam. These are the types of cams use in Stock/ Super Stock Drag Racing classes that have a rule on the max lift they can run.

We run 2.2:1 rocker arms on our SB2 small block combinatons. Two identical lifts at the valve wth the only difference being rocker arm ratio. The engin with more ratio will make more power because the valve is opened faster.
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Old 10-05-2007, 10:03 PM   #15
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So basically its:

Run a stock cam w/1.9 rockers

or

a stage1 cam with stock rockers. Would roiller rockers benefit at all here?


Which produces more HP?
Whats the lift on a stock cam?
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Old 10-05-2007, 10:19 PM   #16
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Higher ratio rocker arms work by extending the valve further into the combustion chamber (valve lift). The more lift the more room for air/fuel mixture to get in and the more room for exhaust gases to get out. This longer opening means that with the same cam more air/fuel can get in (power) and more exhaust gasses can get out (cooler). This is why higher ratio rocker arms reduce pressure in the manifold by about a pound (less boost).

Cams have a big advantage over rocker arms because not only do they have extra lift (cam lobe lift) but can also have longer duration. This means the valves stay open longer allowing more time for air/fuel to move in and for exhaust to move out.

The combination of the two can provide longer opening times (duration) plus high valve lifts (open distance) to create some good power even on a relatively mild cam. This is the reason I went with the stage 1x cam and 1.8 rocker arms. I get more lift than a stage 3 blower cam but not as much overlap and duration for a more mild and less lopey idle (ie street setup).

Somethign else to consider is not to only look at peak horsepower. A dyno chart can show numbers like 260 with stock cam and 1.9 rocker arms and 280 with a stage 1x cam but the power curve of the cam will be much broader allowing for 20-25 horsepower more across the entire rpm band which means more power to the ground constantly. Even though there is only 20 peak horsepower difference between the two it may be as much as 40 lower on the curve and constant so the cammed car would be much faster overall.
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