Be tame enough to fit with stock pistons?

I know Marcy did a touch over 215whp with those cams.

- Drew

 

I found some crane stage three and bought them up asap. They are still in a box waiting for my build to start. I cannot wait to see what kind of power they'll get with a turbo setup.

 

Crower, not Crane.

Different specs.

- Drew

 

I didn't think Walter did any real work with Crower cams on the duratecs? It was the whole crane fiasco.

 

IIRC, he used both and even combinations of both to make power.

It was Crane that was heavily documented however.

- Drew

 

Yeah i guess i just assumed they were small enough to be used with stock pistons because it didn't say so in the description. I am also surprised to see that Walter used Crowers. I thought he was in love with the Cranes because they basically mirrored his own cams.

I would probably see more out of decking the head, or adjusting the gears for a little more top end power but i was curious anyways

 

You can't deck the head on a duratec.

 

Yes you can.

edit: for not being short

I always thought you couldn't deck the head on the Duratec but apparently Tom has done it and i remember reading about a bunch of caterham guys doing it.

 

Besides raising the compression, is there anything else that would benefit from decking?

 

The crower stuff is nice, I was gonna use them on my Zetec build,I have a custom never used set of stage III's, for the zetec if anyone wants to be around 240hp, car was totalled weeks before install, motor was sold before head was done.

 

I'm gonna say it would have a minor effect of unshrouding the intake valves a bit. But I doubt you can really deck the head enough to go as far as is necessary with that. You'd be better off doing a little re-shaping work with a dremel. Here's a good link describing what I'm talking about with pics.

I still don't understand how you can deck the head & not impact the timing cover. I mean, you could probably get away with a tiny little bit. I also don't mean to say that the head can't be re-surfaced. For instance, my engine builder "decked the head on my engine a few thousandths and then compensated by installing a thicker head gasket so that the final position of the head & block relative to the timing cover was the same in the end. This did not affect compression.

 

I still don't understand how you can deck the head & not impact the timing cover. I mean, you could probably get away with a tiny little bit. I also don't mean to say that the head can't be re-surfaced. For instance, my engine builder "decked the head on my engine a few thousandths and then compensated by installing a thicker head gasket so that the final position of the head & block relative to the timing cover was the same in the end. This did not affect compression.

It will affect the timing cover but you can slot the bolt holes for the head and mill to the top of the cover so the valve cover gasket sits flush. The valve chain guide that is bolted between the head and the block is slotted so that won't cause an issue. You will need to get rid of the slack out of the non-tensioner side of the timing chain so that you don't alter the cam timing. You can do this buy simply loosening the cam gears and and retiming the cams. I haven't done this, but I think I covered all the changes! :dunno: