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topcatproduction · Posted: Mon Dec 14, 2009 6:56 pm Post subject: Rad Plumbing

Unfortunately my water outlet on engine is about 5" higher than the rad top, having seen a TVR Griffith recently can I assume that using the same setup would work ok?

I could make a swirl pot up that drops the height incorporating a filler and breather, or would I be best taking a small pipe off the highest point in the top hose and taking it to a catch tank with filler like on most cars?
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TC

ChrisJC · Posted: Tue Dec 15, 2009 9:23 am Post subject:

I would fit a filler neck into the top hose at the highest point, with a small hose going to an expansion bottle.

You just need to get a radiator cap intended for use with that kind of setup (i.e. has 2 seals).

Chris.
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Series IIA 4.6 V8
R/R P38 4.6 V8

ged · Posted: Sun Dec 20, 2009 8:50 am Post subject:

Is this any good to you TC?

http://www.v8tuner.co.uk/product.php?id=256
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SD1's are more than just a donor engine.

topcatproduction · Posted: Sun Dec 20, 2009 5:28 pm Post subject:

Yep it may be, so where would the small expansion hose join in?
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TC

ged · Posted: Sun Dec 20, 2009 5:43 pm Post subject:

It's just an over flow pipe, so run a tube down below the chassis.
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SD1's are more than just a donor engine.

ged · Posted: Sun Dec 20, 2009 6:20 pm Post subject:

Hmm, I've just re-read your post TC. So I'm not sure if you already have an expansion tank or not. Here's a simple system from the SD1 that works. That is if you don't mind a little tupperware showing. Laughing

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SD1's are more than just a donor engine.

topcatproduction · Posted: Sun Feb 07, 2010 10:01 pm Post subject:

This is my top hose out of the thermostat housing- unfortunately it goes up to get round the dissy without hitting the blower belt, if I go with a expansion tank rather than swirl pot do I need to ideally take the small pipe to it from the highest point in the top hose to get rid of air? I could put a take off boss in there- I'm sure you can get them..?

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TC

kiwicar · Gold Member Joined: 18 Nov 2006 Posts: 2583 Location: UK

Hi Tom
as it looks as it will be the highest point in the system it will be a very good place for an air bleed, so yes I would put one there
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I thought the build would take a while!

SuperV8 · Posted: Mon Feb 08, 2010 1:36 pm Post subject:

Hot water doesn't like being pumped down hill. If possible i'd try and keep the top hose level or pointing up hill slightly.

Tom.

topcatproduction · Posted: Mon Feb 08, 2010 2:06 pm Post subject:

topcatproduction · Posted: Mon Feb 08, 2010 10:03 pm Post subject:

If I take a small hose off the top to an expansion tank- do I just need the 1 pipe or should I take another one from the expansion tank to the bottom hose, which would circulate the water in the tank- but risk some heat bypassing the rad...

I'm also not 100% sure about the heater matrix circuit- from the bottom hose to the heater, then back into the rear of the inlet manifold (or the opposite way round!) This is another rad bypass in theory- could it cause any probs?(not that I can think of anywhere else to plumb it in)- unless I put the expansion tank in that circuit? Not quite as high as the front hose but not far off.
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TC

Ian Anderson · Posted: Mon Feb 08, 2010 11:11 pm Post subject:

Bleed pipe only needs about 1/16 inch hole

Yes some bypass but not much and it will allow air rto move

IAn
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Owner of an "On the Road" GT40 Replica by DAX powered by 3.9Hotwre Efi, worked over by DJ Motors. EFi Working but still does some kangaroo at low revs (Damn the speed limits) In to paint shop 18/03/08.

topcatproduction · Posted: Mon Feb 08, 2010 11:31 pm Post subject:

A single one that small? How would a pipe that size allow air to travel up it and water down to replace the air?

Also is there anything wrong with using 1 of these? Seem very cheap- but is there a huge amount of difference between these and kenlowe ones 4 times the price? http://cgi.ebay.co.uk/16-Radiator-Cooling-Fan-Kenlowe-Spal-Pacet-TypE_W0QQitemZ180459009632QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item2a0431f660
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TC

SuperV8 · Posted: Tue Feb 09, 2010 12:10 am Post subject:

The hole is only for the air to vent. Water will fill up from the bottom. The resrtiction is just there to limit flow of water back to the headertank, so more hot water goes through your rad to cool.

When you vent your rads in your house there is no water flow the oposite way to the air. The water will just rise up the vent.

one more point, the vent pipe, well all vent pipes if more than one must all go up hill to the highest point in the system which is where your filler cap should be.

Tom.

topcatproduction · Posted: Tue Feb 09, 2010 10:41 am Post subject:

With your house central heating though you do either automatically or manually let more water in every now and again to keep the pressure up- which is what forces air out.

Thats why I thought I need 2 pipes from the expansion tank, 1 to top hose to let air out and 1 to bottom hose to let water in.

With only 1 tiny hose if when I first fill the system there is a big lump of air stuck in there and only a tiny pipe from the top hose to expansion tank- it wouldn't be big enough to let water down to replace the air that is coming up the pipe! Think of windscreen washer tubing- if you hold it upright its not big enough to let air and water travel in 2 directions, of course if I need 2 pipes then its not an issue!
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TC