CAM Profile & Jetting of the American Speed engine

[vez]

Can anyone supply me with this information, especially interested in the CAM profiling and the Carb jetting!

Cheers

[GTRCLIVE]

Which one ?????????? I think these only about 100 Different versions you can have.

[bigmack]

Why do you need the information? Do you own an Amerispeed engine? Or are you trying to determine proper jet size for a custom motor that your building yourself? If you own an American Speed motor, then you could always go to the trouble of measuring the profile yourself and looking at the jets used. However, the Amerispeed engines come pre-dynod, so they're setup with the correct size jets already. If you don't own one, but want something pretty close then talk to the cam manufacturers (Comp Cams or Crower) and they'd be very happy to help you in your cam selection. I believe that American Speed has their own cam profiles made, but there are a lot of other excellent cam profiles available. Its not that big of a deal really. The heads are what really make the power.
Cheers!
-Mack

[Vez]

I was wondering about the jetting of the engines because I know serveral American Speed engines that have dropped a piston. In my experience (dropped piston) I found after a dyno, that the problem was inadequate jetting!

I was wondering about the cam profiles as I cant find any information on any of American Speeds engines anywhere, I was however, given a part number, but this turned out to be bogus!

[Steve_D]

The cam profile is an ASE special profile and is produced by Comp Cams.

[bigmack]

There are a few other variables to consider besides inadequate jetting. The dyno does not take into account gravitational forces under acceleration, braking, or cornering. Fuel pickup can be a problem, and the addition of a surge tank is an excellent idea. As others have said, its also a good idea to run a fuel pressure gauge or air/fuel ratio meter in the car. They're reasonably priced insurance. I'm not a carb guy, but my friends who are find that its very easy to make jet changes. You might put the Amerispeed engine on the dyno and see what it looks like.
Cheers!
-Mack

[vez]

Well I have been investigating build an engine and have done much research about whats running in Ultima's and have heard of several American Speed engines having to be returned as they have dropped cylinders.

After to speeking to a number of poeple I have found out that many dyno guys have basically said that the standard Ultima fuel pump is no where near powerful enough to cope with a carbed engines full demand for fuel and that they are also underjetted!!

[jschwartz]

Detonation is usually the cause of piston failure. Which could be lean jetting or differences in fuel.
I know on my motorcycles when running racing fuel I generally had to jet richer in order to get the proper AF ratio.