What did you do to your XJ today? 1M Views

[Easy Rollins 1]

Geez,glad it helped.Just goes to show how small the water galleries must be.

[quints]

Originally Posted by junglejuice

This is also only on water, zero coolant so that should improve with coolant in the system (I hope)....

You might find it runs a little warmer with the coolant in it, JJ. The specific gravity of most coolants (and, I admit, I'm thinking mainly of, say, Castrol Anti-Freeze / Anti-Boil and other, like, ethylene glycol-based 'concentrates') is actually quite high. Try picking up a 20L drum of the stuff sometime!

Even at a minimal-for-corrosion-protection 30 per cent mix, the specific gravity of the 'coolant mix' is that little bit higher than just straight water. The higher specific gravity lowers the ability of the mix to dissipate the absorbed heat. Not by a huge margin, but certainly something that could be noticed in a 'marginal' cooling system.

But . . . what's the alternative? The advantages of running the stuff -- increased temperature before boiling occurs and corrosion prevention -- far outweigh the small disadvantages.

[junglejuice]

Originally Posted by quints

You might find it runs a little warmer with the coolant in it, JJ. The specific gravity of most coolants (and, I admit, I'm thinking mainly of, say, Castrol Anti-Freeze / Anti-Boil and other, like, ethylene glycol-based 'concentrates') is actually quite high. Try picking up a 20L drum of the stuff sometime!

Even at a minimal-for-corrosion-protection 30 per cent mix, the specific gravity of the 'coolant mix' is that little bit higher than just straight water. The higher specific gravity lowers the ability of the mix to dissipate the absorbed heat. Not by a huge margin, but certainly something that could be noticed in a 'marginal' cooling system.

But . . . what's the alternative? The advantages of running the stuff -- increased temperature before boiling occurs and corrosion prevention -- far outweigh the small disadvantages.

I will be running coolant again as soon as I can verify that the cooling system is working properly....

[Easy Rollins 1]

Went fishing,caught nothing.


Dawn Patrol

[junglejuice]

Nice pic there Easy....

I took delivery today of a new play mate for mine, I nice stock '95 limited which I will be parting out shortly, pics to come....

[Easy Rollins 1]

Do I get a finders fee? LOL

I'll settle for the cruise control.

[carvesdodo]

Originally Posted by junglejuice

Nice pic there Easy....

I took delivery today of a new play mate for mine, I nice stock '95 limited which I will be parting out shortly, pics to come....

Im still betting you had a childhood obsession with pulling clocks apart jj

....

and agree .... Definitely a fine piccy.

Originally Posted by quints

You might find it runs a little warmer with the coolant in it, JJ. The specific gravity of most coolants (and, I admit, I'm thinking mainly of, say, Castrol Anti-Freeze / Anti-Boil and other, like, ethylene glycol-based 'concentrates') is actually quite high. Try picking up a 20L drum of the stuff sometime!

Even at a minimal-for-corrosion-protection 30 per cent mix, the specific gravity of the 'coolant mix' is that little bit higher than just straight water. The higher specific gravity lowers the ability of the mix to dissipate the absorbed heat. Not by a huge margin, but certainly something that could be noticed in a 'marginal' cooling system.

But . . . what's the alternative? The advantages of running the stuff -- increased temperature before boiling occurs and corrosion prevention -- far outweigh the small disadvantages.

The alternative ??? .... in an old 1970s cast iron engine ... with maybe an aftermarket copper/brass radiator fitted ???

..... find a coolant that uses minimal eth-gly and has anti-corrosive and anti-foaming additives in it.

... as its not like eth-gly is "anti-corrosive" ..

The boiling temp advantage of "coolant" over water is minimal .... as its inability to shed heat as efficiently as water makes the 5*c or so higher boil point ... a moot point, IMHO.

Non Pressurised (no radiator cap ) Boiling Point .... Eth-Gly/Water

0/100 ....... 100*c
10/90 ....... 101.1*c
30/70 ....... 104.4*c
50/50 ....... 107.2*c

Both coolant AND water ... have their boiling temps raised ... in a pressurised cooling system.

Some sales clowns will quote water boils at 100*c ... and then say how wonderful the 50/50 green or red crap is - coz it boils at 130* ...

... which requires them to be reminded about radiator cap pressures on both liquids ..