[v12-engine] valvetrain miscelaneous

Hello everyone:

I am in the final phase towards geting the xjs on

the road. I am awaiting shims to adjust the clearances
of the new GTJ 11.5 or stage 1 cams (anybody used
them? I�d like to hear from you!). They gave me some
strange clearances. They are .008 for inlets and .010
for exhaust. I think they are a bit tight, but
everyone here thinks they are fine. What do you all
think? I also did something really nice to the valve
covers: I polished them and then painted them with
plasticote “wrinkle finish” black paint, sort of like
the one on ferraris, and polished the nuts and oil cap
to an almost crome finish. I can�t wait to put them
on!

Rodrigo Morales
Monterrey Mexico__________________________________________________
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I am in the final phase towards geting the xjs on

the road. I am awaiting shims to adjust the clearances
of the new GTJ 11.5 or stage 1 cams (anybody used
them? I�d like to hear from you!). They gave me some
strange clearances. They are .008 for inlets and .010
for exhaust. I think they are a bit tight, but
everyone here thinks they are fine. What do you all
think?

I’ll bet they’re fine. The OEM cams call for 0.010 - 0.012, but they
have “quieting ramps” – and Bywater recommends going to larger gaps
yet (0.013 - 0.015) to keep the quieting ramps from giving you WAY
too much duration without any of the flow benefits. But I’ll bet the
GTJ cams don’t have quieting ramps. I’d also bet they’ve run their
engines on some dynos, and arrived at the recommended clearances
through actual testing rather than theory.

I also did something really nice to the valve
covers: I polished them and then painted them with
plasticote “wrinkle finish” black paint, sort of like
the one on ferraris, and polished the nuts and oil cap
to an almost crome finish. I can�t wait to put them
on!

It’s a real shame they didn’t come like that. But at least they came
with cam covers that were nice enough you could do that fairly
easily. Coulda been worse; it coulda come with stamped sheet metal!

– Kirbert | Palm’s Postulate:
| If anything is to be accomplished,
| some rules must be broken.
| – Kirby Palm, 1979
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http://www.jag-lovers.org/cgi-bin/majordomoFrom: rodrigo morales morales_r_m@yahoo.com

The clearences have little to do with necessary valve end clearance and more
to do with cam profile and the ‘ramp’ the cam profile has before actual lift
occurs (the cams must first remove the clearances before it thinks about
opening the valve). Stick to what is recomended by the cam supplier and dont
go standard as you will shorten the valve timming and take the edge off the
lift just a bit. I hope you have timmed the cam as directed; as using the
cam plate and peg is usually ‘out the window’ when cams are modified.
You will need a specialist to set up the engine with the other modified
components in the ‘package’ Please tell us you do have other components
otherwise a power loss and engine damage may be heading your way. Good luck.
Regards Don Miles

Hello everyone:

I am in the final phase towards geting the xjs on

the road. I am awaiting shims to adjust the clearances
of the new GTJ 11.5 or stage 1 cams (anybody used
them? I�d like to hear from you!). They gave me some
strange clearances. They are .008 for inlets and .010
for exhaust. I think they are a bit tight, but
everyone here thinks they are fine. What do you all
think? I also did something really nice to the valve
covers: I polished them and then painted them with
plasticote “wrinkle finish” black paint, sort of like
the one on ferraris, and polished the nuts and oil cap
to an almost crome finish. I can�t wait to put them
on!

Rodrigo Morales
Monterrey Mexico__________________________________________________
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Kick off your party with Yahoo! Invites.
http://invites.yahoo.com/
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