XUL 27T re-furb' update

[SKiddell]

I built a car that had a small heat soak issue. The best way I found was to fit an EWP that would carry on running for a few minutes after the car was switched off.

Worked well.

Hi Frankly, this isnt a heat soak issue, its a 108 degree after 10 mins at tickover issue (also both cars have EWP's already fitted plus big alloy rads). Once switched off the heat dissipates extreamly rapidly (I have an SPA digital water temp gauge fitted)

Out of intrest, did you need to punch extra holes in your head gasket to suit the P90 ??

No, the custom copper gasket I had made was a correct fit in the first place

I am not going to get too excited by this as its a relatively minor issue that is easily solved (no doubt we will debate it ad infinitum) after all I have dealt with it for 18 months and multiple 290 HP rolling road pulls by just cycling my water pump on and off for a couple of seconds which seems to move the air lock away from the head and stat housing to the rad where it cools and contracts.
The head has been off several times and it + bores show no signs of the damage normally associated with over heating. (det, seat damage, piston scuff etc)

 

[tel240z]

Terry is 100% there with the aid of a hose clip around the lid of the header tank, 170 mile round trip and 5 shots at the 1/4 mile and the fan never clicked in once and not a drop of coolant used and yes a much better quality tank is a must but my NOS metro jobby is in the development stage also is nice to see the red coolant level rise and fall when hot and cold also reassuring that its in there.
pictures anyone ?

 

[zedhead260]

see if you can spot me at 1:00min.

And in case you missed it (or couldn't be arsed)......

And yes, that is Duncan's Celica GT to my right

 

[SKiddell]

Terry is 100% there with the aid of a hose clip around the lid of the header tank, 170 mile round trip and 5 shots at the 1/4 mile and the fan never clicked in once and not a drop of coolant used and yes a much better quality tank is a must but my NOS metro jobby is in the development stage also is nice to see the red coolant level rise and fall when hot and cold also reassuring that its in there.
pictures anyone ?

And your pressure relief mechanism is ?

 

[tel240z]

Its all in the cap, the right valve lets pressure out to atmosphere as the screwdriver demonstrates and the left valve allows air to be drawn in at cooling, fortunately there is enough air space in my ''metro bottle'' to allow expansion and contraction of the coolant without any loss, infact the level only rises about 1'' 1/2 from cold to hot my problem i had was the fact that the cap expanded under heat and the thread would not grip hence the jubilee clip upgrade genuine tank, pattern part cap from taiwan, austin rover no stock.
So anyway rob a few pics of mine for you
Tel

 

[Mr.G]

Good to hear you now know why that was occuring and with Steve and Tel pioneering mods to get round this phenomenon that must be reassuring

 

[zedhead260]

So anyway rob a few pics of mine for you

Thanks Terry, I didn't realise you had similar issues.
What is the capacity of the bottle ?

Good to hear you now know why that was occuring

Whilst I have talked this through on the phone with Steve on a few occasions, it always helps to share this info online for the benefit of others.

Thanks All

 

[SKiddell]

Thanks Terry, I didn't realise you had similar issues.
What is the capacity of the bottle ?

Next visit, doctors to have your ears shringed or a new phone that doesnt block out the words "Terry has had similar issues"

Terry
Its still an expansion bottle with a bleed cap not a pressure cap
If you had the right tank with the right pressure cap then it wouldnt need that loverly shiney jubilee clip.

 

[johnymd]

This discusion demonstrates just how good a forum can be. Shared knowledge and healthy discusion with us all learning from Terry's solution. I was very impressed with your mod and always enjoy looking at your car and how it's evolved.

 

[Mr.G]

this discusion demonstrates just how good a forum can be. Shared knowledge and healthy discusion with us all learning from terry's solution. I was very impressed with your mod and always enjoy looking at your car and how it's evolved.

+1

 

[Rob Gaskin]

Guys I know the issue is more complex than this but are your aftermarket radiators tall enough?

However I do know that some cooling systems can run with radiators lower than the highest point. Found that out when working on my lads 306 TD, you had to put a tube in the top of the rad to fill it up and bleed the heater pipes etc. then remove pipe and put cap back on.

Terry, nice mod!

 

[johnymd]

You beat me to it Rob. I was going to say that mine and many other ally rads have their cap lower than the standard rad so require a higher expansion vessel to increase the water level(I noticed this on Terry's). Although mine is lower, my engine sits several inches lower in the engine bay so for me its not a problem.

 

[tel240z]

Blimey my head wont fit through the door soon !
John wait till yo see the l/lock

Rob i estimate that the bottle is about 1 to 1 1/2 litres as i remenber starting this mod on saturday morning then testing on sunday

Steve yep your right and those nice shiny ones on e-bay £160ish are just the job and i would still run the overflow pipe into a seperate recepticle for extreme situations so that expelled coolant can be drawn in at cooling time, now how many tanks can i fit in here

 

[Rob Gaskin]

Been PMing Rob and thought I'd input the following:

The top of my thermostat housing is virtually level with the top of my rad tank - been and checked this morning with a spirit level.

When I replaced my head gasket I had to make about a dozen additional water-way holes in it to match my E88 (240) head. A 280 gasket is required because I have 280 bore. I wasn't happy blocking them off. Ok 280s run with less holes but are modified 280s cooled enough?

Look at this picture of Steve Perez's car. Nice tall rad and thermostat bleed off/header tank system. These guys don't mess about when on Safari!!! In fact what a lovely strong car - think he was glad of that later.

Kallstroms car has a nice tall rad too - and a nice head!

 

[SKiddell]

I think you can eliminate the rad height issue, I have run the same rad for 6 years with 6 differant engine incarnations, the rad has never moved, only one engine config has had these issies.

One of the most common mods is to fit an alloy rad, if it was a rad height issue surely we would be hearing of this from all four corners of the world....

As I said, some pretty high profile race shops have gone to some significant measures to eliminate this, if it was as simple as "its them new fangled shiney radiators" then surely they would have figured that out.

I would advise anyone interested to go read the thread on Hybridz, its a fair few pages long and involves some extensive testing and collecting of data.

 

[Albrecht]

Kallstroms car has a nice tall rad too - and a nice head!

That's nothing like the original radiator which was on the car, which was a Works aluminium item with an oil cooler built into the right hand side:

 

[zedhead260]

Looks like a neat solution. I assume it had the same / similar issue despite the taller rad.

As I'm using S130 thermostat housing, I have a take off I can use.




Terry,

Out of interest, what cylinder head casting do you have ?
Stock or electric water pump ?
I assume your reason for doing this was for issues reasons ?

 

[datsun dave]

That's nothing like the original radiator which was on the car, which was a Works aluminium item with an oil cooler built into the right hand side:

What's the bag on the wing for extra water for windscreen washers ? Or a overflow.

 

[Albrecht]

What's the bag on the wing for extra water for windscreen washers ? Or a overflow.

Nothing to do with the cooling system, it's the classic Jideco 'Kangaroo' bag - a vinyl bag full of windscreen washer fluid with an electric pump built into the bottom of it. Standard equipment on many Nissans of the period, and used both as a supplementary washer system where space allowed, and a standalone system where space was tight ( like on an injected LY, for instance ).

 

[Rob Gaskin]

Will someone please just put me out of my misery.............

try a standard rad. I don't mind if you say 'I told you so' in large font

Any comment on head/block waterways - or should I read the hybrid thread?

Steve, I do like aluminium rads by the way - especially ones like that on Steve Perez's car.

Alan, nice pic of the composite rad. I bet it was changed because the water section wasn't big enough