N/a cam on zetec turbo
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From: manchester
N/a cam on zetec turbo
Has anyone fitted an n/a cam to a zetec turbo?i think i saw something some where or even possible read some thing a few years of some using an n/a cam on the inlet,i might be wrong though just thought id ask and see
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From: london
The Focus RS uses exactly the same 'N/A cams' as the 1.8 and 2.0 blacktop engines so yes, you can run a set of 'N/A cams' on the Zetec.
The problem with N/A cams is that they tend to run a longer duration (particularly the inlet cam) than turbo specific cams. That may have been a problem in the past because cams tended to have a very long duration (when compared to the lift). Most modern N/A cams now have a shorter duration (compared to the lift) so it tends not to be a problem.
For example, the duration of the inlet cam on Crower's stage two N/A cams is 256 degrees and the duration of the original Cosworth cams is 265 degrees (IIRC) so even quite an aggressive road cam is still well within the duration limits required for a turbo engine.
As long as the cams don't have a very long duration and the inlet cam isn't massively more aggressive than the exhaust cam then you shouldn't have a problem. Even if you do come across a problem when they're set at 0 degrees it should be easy enough to dial out by retarding the ignition slightly.
The problem with N/A cams is that they tend to run a longer duration (particularly the inlet cam) than turbo specific cams. That may have been a problem in the past because cams tended to have a very long duration (when compared to the lift). Most modern N/A cams now have a shorter duration (compared to the lift) so it tends not to be a problem.
For example, the duration of the inlet cam on Crower's stage two N/A cams is 256 degrees and the duration of the original Cosworth cams is 265 degrees (IIRC) so even quite an aggressive road cam is still well within the duration limits required for a turbo engine.
As long as the cams don't have a very long duration and the inlet cam isn't massively more aggressive than the exhaust cam then you shouldn't have a problem. Even if you do come across a problem when they're set at 0 degrees it should be easy enough to dial out by retarding the ignition slightly.
Last edited by hogdog; Nov 13, 2011 at 04:47 PM.
Thread Starter
Regular Contributor
Joined: May 2009
Posts: 238
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From: manchester
The Focus RS uses exactly the same 'N/A cams' as the 1.8 and 2.0 blacktop engines so yes, you can run a set of 'N/A cams' on the Zetec.
The problem with N/A cams is that they tend to run a longer duration (particularly the inlet cam) than turbo specific cams. That may have been a problem in the past because cams tended to have a very long duration (when compared to the lift). Most modern N/A cams now have a shorter duration (compared to the lift) so it tends not to be a problem.
For example, the duration of the inlet cam on Crower's stage two N/A cams is 256 degrees and the duration of the original Cosworth cams is 265 degrees (IIRC) so even quite an aggressive road cam is still well within the duration limits required for a turbo engine.
As long as the cams don't have a very long duration and the inlet cam isn't massively more aggressive than the exhaust cam then you shouldn't have a problem. Even if you do come across a problem when they're set at 0 degrees it should be easy enough to dial out by retarding the ignition slightly.
The problem with N/A cams is that they tend to run a longer duration (particularly the inlet cam) than turbo specific cams. That may have been a problem in the past because cams tended to have a very long duration (when compared to the lift). Most modern N/A cams now have a shorter duration (compared to the lift) so it tends not to be a problem.
For example, the duration of the inlet cam on Crower's stage two N/A cams is 256 degrees and the duration of the original Cosworth cams is 265 degrees (IIRC) so even quite an aggressive road cam is still well within the duration limits required for a turbo engine.
As long as the cams don't have a very long duration and the inlet cam isn't massively more aggressive than the exhaust cam then you shouldn't have a problem. Even if you do come across a problem when they're set at 0 degrees it should be easy enough to dial out by retarding the ignition slightly.
That was a good read mate thanks for your help
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