Camshaft Upgrade

[hotflyer71 0]

 

I recently found out that the XU9J4 cams are longer than the XU10J4s'

 

I am having the XU9J4 cams regrind and fitting them into apparently may need some cutting on the accessory drive slot.

 

Anyone can help me here? S.O.S

 

Thanks

 

 

[cybernck 402 1 Cars]

^ please introduce yourself here:

 

http://forum.405mi16.com/index.php?showforum=15

 

thanks.

[petert1345402284 0]

The difference between an XU10J4 and XU9J4 camshaft is so small it's not worth worrying about. The difference is only in the opening/closing ramps and not the effective lift/duration. After 0.050" lift they're identical.

 

You can convert an XU9J4 inlet cam for use in an XU10J4 if you:

 

a. mill the slot for the vacuum pump drive (if you have one)

b. drill the oil feed holes for the same

c. press on a cam reference tang

 

If you don't have a vacuum pump then a and b aren't necessary. Finding a spare cam reference tang is difficult however, as they only come with the camshaft. They are not available as a spare part.

 

So lots of effort for zero gain. I would just get your XU10 cam(s) reground.

[hotflyer71 0]

The difference between an XU10J4 and XU9J4 camshaft is so small it's not worth worrying about. The difference is only in the opening/closing ramps and not the effective lift/duration. After 0.050" lift they're identical.

 

You can convert an XU9J4 inlet cam for use in an XU10J4 if you:

 

a. mill the slot for the vacuum pump drive (if you have one)

b. drill the oil feed holes for the same

c. press on a cam reference tang

 

If you don't have a vacuum pump then a and b aren't necessary. Finding a spare cam reference tang is difficult however, as they only come with the camshaft. They are not available as a spare part.

 

So lots of effort for zero gain. I would just get your XU10 cam(s) reground.

 

I have just bought Catcams item (4912526) with their Nonius Trulock Pulley, saved all the trouble above but at a huge cost.

 

*** Dreaming of that smooth running/powerful (200bhp) 2090cc XU10J4 now that I have all the bits and pieces ***