Hello,

Has anyone put a degree wheel on their XKR and plotted the camshaft timing? Specifically I am looking for:

Lift

Duration

Stock lobe separation angle

Why would I be interested in these? The Eaton blower is maxed out on a 4.2
If the lobe separation angle is to low 110 degrees for example the engine will run cooler but will make less power and be wasting boost. If the lobe separation angle is 114 - 116 degrees it won't be losing boost out the exhaust. Since it is a DOCH engine the Lobe separation angle and installed centerline are easy to change with modified sprockets. There may be a significant amount of low cost power there for the taking.

Thanks

 

Check this thread in the engine section:

https://www.jaguarforums.com/forum/j...project-52518/

 

Thanks,

That thread was primarily focused on vibration, I also read your thread on the TS conversion. I am jealous as AVOS is no longer making kits. Just a little more work !!!
Well maybe a lot more...LOL

 

4.2 has so short exhaust duration that there is zero overlap even at no lift with stock 115 LSA. 4.0 has 120 LSA and that opens space for more power by degreeing the intakes by 10-15 degrees and still no problems with overlap. This would be good specially with Eaton since your power range is lower than with TS.

PS. if anyone needs higher lift / longer duration exhaust cams for 4.0/4.2 , I have brand new pair. They work with stock pistons and valve springs.