rad under rails

ElusiveStranger · Posted: Sat Feb 12, 2011 2:56 am Post subject:

There's no extra pressure fella ;-) pressure is a function of force over area.

I'm sure you've followed my design & read my mumblings ;-)

Kin ell, it's neigh on 3am. Mine's a Morgan's and dandylion & burdock please.
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'78 Bay, 2 litre 091 box, EJ20 NA & the ashtray's on the 'right' side.
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Bugsy_malone 666 · Posted: Sat Feb 12, 2011 1:26 pm Post subject:

Superleggo · Posted: Mon Feb 13, 2012 10:27 pm Post subject: rads

So I have got ot make a decision on a rad for my Zetec. Looks like 2 x 1.3 golf rads work ok. Any other suggestions before I press the buy it now button on fleabay?

when joining the two rads together with the 180deg pipe, is this suseptible to air locks? does it need an air bleed back to the header tank?

One rad seems a simpler solution provided it is big enough.

32mm inlets would be nice to save pipe size changes.

Any thoughts if you had the chance again!

Bugsy_malone 666 · Posted: Tue Feb 14, 2012 12:19 am Post subject:

I guess I cleared my airlocks by driving round the local block which includes a steep downhill and uphill section to work the air out, cant say I have had massive problems with airlocks to be honest, the van has never really gotten hot even under alot of load.

Basically what I looked at is the size of the radiator that currently cools the engine I use, then look at how much grill area the vehicle has and thats kind how I worked out how big to make my scoop and make sure I had enough capacity.

With my system, had to fill it up a couple of times from scratch and each time I have filled it up as much as possible, run it and filled it some more, then gone round the block when its warm and opened the thermostat up and driven up/down the hill road (also brings the engine up to temp pretty quick!) at most normally I dont have to add a whole lot of water but it does get the air out the system.

Think I worked out my system takes about 12litres of liquid!

Some of the other rad setups on here have different solutions to joining radiators, in such a way that you cant get airlocks, for instance you could run them parallel instead of in series meaning you have no 180deg bend to worry about Happy

have a look at some of the other setups and you should see what I mean Happy

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13 window deluxe · Posted: Tue Feb 14, 2012 2:06 pm Post subject:

ive never had any air locks with the 180 degree joiner between the rads as its much lower than the header tank (which must be the highest thing in the system) so the air will naturally come to the top as its filled, i always drill a 4mm hole in the rim of the thermostat if it doent have one from the factory this allows the sytem to fill correctly with the stat shut.
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1964 rat 13 window deluxe 1Z tdi,
1975 rhd twin slider tintop (TBA)
1991 golf 2 gti with tweaked AHU tdi,

previous tdi swaps: gone but not forgotten
1979 rhd twin slider tintop bay ahu 1.9tdi
1990 T25 1Z 1.9tdi
1993 suzuki samurai with 1Z 1.9tdi

Superleggo · Posted: Tue Feb 14, 2012 5:58 pm Post subject: 180 deg bends

Well it looks like the 180 deg bend is tried and tested so no point in reinventing the wheel I am happy to follow. Its a neat solution so that is me sorted.

I like the 4mm hole trick in the thermostat 13 Window. I wish I knew that 15 years ago when my other half had a Renault 21as it was a .....ard to get the air out of. Renault must have known that as the supplied bleed valves in the OE rubber pipes!

Just read you other post on 32mm mdpe polypipe to get to the rad. Seems like a good idea as most alternatives seem expensive.

MDPE has a melting piont of 120-130 dec C I guess you van has never over heated. The zetec water pump / rail outlets are also near the exhaust manifold so may need to get away from the engine in rubber to be safe.

Superleggo · Posted: Thu Mar 08, 2012 11:37 pm Post subject:

13 window. Been giving a bit more thought to you mdpe pipe idea and it is growing on me if I run the section near the exhaust in someting with a bit more heat resistance.

Did you flare the ends of the MDPE pipe use, an olive or groove the pipe to connect to rubber joiners to prevent them sliding off under pressure?