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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xj-s] Coolant Flow
> From: "Peter Cohen" <petercohen@unn.unisys.com>
> >Also note
> >that each head has six coolant outlets directly above the exhaust
> >ports, but the center two are blanked off. The front two are
> >connected directly to the thermostat housing, while the rear two are
> >connected to the thermostat housing via the coolant connecting pipe.
>
> I guess I'm a little dense tonight. Are you implying that there is less
> coolant flowing to the center of the cylinder head than the rest of the
> head?
No, I don't think so. The coolant enters each bank of the block at
the front and flows around the cylinders. It then flows upward into
the head through a collection of openings. Most engines have these
openings made entirely too large and then design the holes in the
head gasket smaller to provide proper distribution; that way they
only have to change the gasket design to correct flow problems. It
looks like the Jag V12 is no exception there.
Once in the head, the coolant flows out into the coolant manifold and
to the thermostat on each side. I merely thought it was interesting
that the coolant outlets on cylinders 3 and 4 on each bank had been
sealed off so the coolant can only come out the other 4. Since
coolant is going IN to all six, I presume it flows sideways within
the head to come out.
I also found it interesting that 2 of the 4 open ports on each bank
were right at the front two cylinders, since you would think that a
high proportion of the coolant would take the short route from the
water pump at the front, around cyl 1, up into the head above cyl 1,
out the port there and straight to the thermostat.
-- Kirbert | If anything is to be accomplished,
| some rules must be broken.
| - Palm's Postulate
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