In reply to a message from 64etype sent Sun 30 Oct 2016:
Well I assumed it would be painted black anyway but now we
will have to wait till someone else goes for the ‘‘upgrade’’
(always makes me smile). I would however suggest that you
not use a segmented belt. The throw on an XK engine (or
run if you like) is too long for those belts. I had the
same idea you did (better contact) but with the long run
the belts flap (even when very tight) when they circle the
compressor (any compressor). This causes them to stretch
and become loose. Solid belts of those lengths are hard to
come by except in fractional power offerings. Having now
switched all of my AC cars and others to solid belts there
is no issue. While I am sure the Gates fellow knows his
belts I doubt he has much exp on an XK engine. BTW the
same problem crops up on some old US big block Iron with
AC or PS in trucks. Just wondering why you did not use a
‘‘Terry’s rebuild’’ (Now Coventry West)? While I am sure
they have some returns I have not had one either under
Terry or CW. Did know Rock sold out as the Ads billing for
the JJ changed in the latest reports. Good luck–
The original message included these comments:
speed on the tensioner. I spoke with a Gates belt engineer
about running a segmented ‘‘V’’ belt on the back side over an
idler. While not ideal, he recommended using the largest
radius possible for the idler. A spare belt will be part
–
George Camp
Columbia SC, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from Geo H sent Sun 30 Oct 2016:
George,
Their descriptive material makes a big deal about these pumps being an exact duplicated (externally) of the original. Essential for proper fit with the kit. If it’s a County, I can buy one for less elsewhere. I’ll call
pumps being an exact duplicated (externally) of the
original. Essential for proper fit with the kit. If it’s
a County, I can buy one for less elsewhere. I’ll call them fi
first thing tomorrow.
Thx–
The original message included these comments:
The one I got from XKs was a ‘County’ brand and fit fine -
but then I do not have AC.
–
Eric
DFW Texas, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from 64etype sent Sun 30 Oct 2016:
Sorry - my mistake. The one I got (County) was from
Terry’s.
That’ll teach me to trust my memory.–
The original message included these comments:
Their descriptive material makes a big deal about these pumps being an exact duplicated (externally) of the original. Essential for proper fit with the kit. If it’s a County, I can buy one for less elsewhere. I’ll call
The one I got from XKs was a ‘County’ brand and fit fine -
–
Geo Hahn 1969 OTS 4.2
Mt Lemmon, Arizona, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from George Camp sent Sun 30 Oct 2016:
George,
XKS actually hype the bling factor for the shiney aluminum pu
pump. Guess I could have painted it. Simply opted for new ve
versus rebuild given that the pump is seriously buried un
under the AC kit arrangement. Minimizing potential for la
later failures.
I assume Rock chose a segmented belt because of the reverse
radius over the idler pulley…an unconventional use of a
V-belt. The inside of the V is not designed for any
serious reverse bending (per the Gates engineer) and would
quickly develop cracks. The segments relieve some of that
stress. Still not a great idea in the estimation of the
Gates engineer, but can probably get away with it. Odds go
way up with a large radius on that reverse idler. He said
industry guidelines call for 4.5 inch diameter idler for a reversal
reversal of this segmented belt width. The kit supplies a 3’’ idler…I can fit
3’’ idler…I can fit a 4’'. While I see your point, I
wonder which is the greater of the two evils. If the
original design gives problems in service, I have a two
belt redesign in mind that will both eliminate a reverse
idler from the system and allow for solid belts. Rock told
me there have been no service problems with the 3.8 belt
arrangement in the many sedan and the few E-type kits he
sold. (I am aware of at least one problematic install on a
4.2, which uses two reverse idlers and an extremely long V
belt. Might have been a pulley alignment issue. Anyway,
I’m attempting to reduce the odds of failures with a larger
idler. Have you used the Retro Air kit in any of your ca
cars?
Thanks–
The original message included these comments:
(always makes me smile). I would however suggest that you
not use a segmented belt. The throw on an XK engine (or
run if you like) is too long for those belts. I had the
same idea you did (better contact) but with the long run
the belts flap (even when very tight) when they circle the
compressor (any compressor). This causes them to stretch
and become loose. Solid belts of those lengths are hard to
come by except in fractional power offerings. Having now
switched all of my AC cars and others to solid belts there
is no issue. While I am sure the Gates fellow knows his
–
Eric
DFW Texas, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from 64etype sent Sun 30 Oct 2016:
Well the belt issue may remain open, but no I only find and
use original or at least factory supported AC systems. As I
hold all of the original drawings of the development of
Jaguar AC systems with Artic Car (a Texas Firm) it is easy
to either find or make the parts. Rock did some good work
and he and I talked often but he simply did not agree with
doing it in period. You are using a rotary compressor which
may be less stressful than the piston (period) ones I use
but even rotaries have a compression stroke that causes the
stretching.–
The original message included these comments:
idler. Have you used the Retro Air kit in any of your ca
cars?
–
George Camp
Columbia SC, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from George Camp sent Sun 30 Oct 2016:
Given the marginal cooling situation with the S1 E-type,
the more modern components would seem to provide a margin.–
The original message included these comments:
and he and I talked often but he simply did not agree with
doing it in period. You are using a rotary compressor which
may be less stressful than the piston (period) ones I use
but even rotaries have a compression stroke that causes the
stretching.
–
Eric
DFW Texas, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
In reply to a message from 64etype sent Sun 30 Oct 2016:
Well I am not only thinking about E-types but MK2, MKIX, and
Xk150s that have less than the E. The big secret is putting
the primary cond. under the bumper in the saloons so there
is almost no thermo bleed to the rad! E-Types in factory
condition have little issue!–
The original message included these comments:
Given the marginal cooling situation with the S1 E-type,
the more modern components would seem to provide a margin.
–
George Camp
Columbia SC, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–