Originally posted by Twisted6:
Then how about this curve ball?

Jaguar S-type 3.0 VVT cams? Haven't amassed any useful cam timing information on it,
Yet I do have lobe lift at intake and exhaust (.3688" and .3725" respectively). Much higher than the .188"/.188" found in the SVT, Escape, Taurus and 6 cams.


.188" lift is incorrect to use.

You need to be comparing effective lobe lift.

The normal cams effective lift is .386" - .388" (roughly 9.8mm)

Yes the Jag cams have less lift. They also have less piston to valve clearance so that makes complete sense. The Jag uses domed pistons while the regular 3L is relieved flat tops.

This is also part of the reason why I state using higher lift cams in a 3L may use up the small amount of clearance available.


From the dyno graphs I've seen of the Jag cams I am not too impressed personally. It is quite possible the Jag uses the same exhaut cam as the 6. So far that exhaust cam looks to have some promise.

As for better intake cams. You will have to look at the selection of aftermarket custom cams (mainly CAT Stage 3 or 4 - as they look nice) to better the SVT profile.


My statement of oval intake with 6 exhaust for boosted applications is a good one. It gives them a shot at a real exhaust cam that doesn't drastically choke of power right when the engine starts making it. You can't use SVT exhaust cams because of the pitch difference.
Also the combonation cuts nearly half the overlap verses the SVT setup which is paramount for running higher boost levels!
The oval intake cam is very well suited to boost. Valve timing right near TDC with quick ramps and not a lot of duration. The 1.8 follower ratio is excellent for boosted applications as well.

It would be interesting to see a high boost turbo try this...

2000 SVT #674 13.47 @ 102 - All Motor! It was not broke; Yet I fixed it anyway.