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Rb30Det Down On Torque

James_03

By James_03,
in Engines & Forced Induction

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James_03 Mentor

James_03

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Cool thanks guys, I was a bit dubious about it being the ECU/AFM's myself. Is there anything stopping them from timing properly with a degree wheel without a cam card?

From what I have read, it looks like having a cam card shouldn't really matter if it's timed this way, but I could be wrong on this.

I will take it back and just shell out to have it timed properly, I am not confident that just zeroing both cams is the best solution. I fully agree that with the non standard timing belt system on the 3ltr there must be more attention to detail in this area.

Cheers.

GTSBoy Grand Master

GTSBoy

Posted
Posted

Is there anything stopping them from timing properly with a degree wheel without a cam card?

From what I have read, it looks like having a cam card shouldn't really matter if it's timed this way, but I could be wrong on this.

It's actually very easy to understand. Let's say you have an absolutely standard motor and you want to put some cams in it. The cam manufacturer knows that in that application, the cam should be installed on certain lobe centres. So they write that on the spec sheet. You can then go and put a degree wheel on the front of the crank, install the cams and set them up according to the spec sheet, and the cams will likely be in the correct location. The same goes if the application is not standard, as long as the cam manufacturer has a good idea of where the cams need to be set up for whatever combo they're going into.

But now let's say you have a 25/30 or 26/30. These things are not all the same. They have different timing belt setups and all sorts. There's a bunch of different piston/head combos. Some have variable cam timing, some don't. So the best thing to do is to put the cams in the head in the middle of the adjustment range, then dyno it and adjust the cams and see what settings give the best result. You could try and set them up just with a degree wheel, and you might get it right.....but you might get it quite wrong too.

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