Moving away from a rear mouted rad.

72_bay_simon · Padawan Joined: 13 May 2006 Posts: 79 Location: Hampshire

I am considering trying to relocate the rad underneath again. Its a pain not being able to get to the engine! My plan is to make a frame for the rad, use four of those flexable hoses from halfrauds then copper pipe to join it all up.

I think this will give my fans an easier time on the motorway as well.

I will use the TSR rad mounted flat and as close to the back of the area between the chasis rails as i can get it. A small scoop in front of this will force air into the space between the chassis rails and the only way for this to escape will be through the rad (downwards)

I will try and make a flow through header that goes from the output of the engine then on to the rad.

Whatever happens, it must surely get more airflow than it does in the back and it works OK there. So if I get the fans to stay off a bit more it will be an added bonus.

What do you think?

Cheers.
Simon.

Alex (FTS) · Posted: Mon Jul 30, 2007 9:51 am Post subject:

Sounds like a good plan-it does seem to be a well tried and tested solution sticking it under the van. Keep us posted with pic's once you get started.

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chuggaboom · Posted: Mon Jul 30, 2007 11:04 am Post subject:

have a look on rjes website re cooling he has lots of intresting point on there including the use of copper pipe

and ducting

well worth a read

72panelvan · Posted: Mon Jul 30, 2007 4:33 pm Post subject:

http://www.rjes.com/html/material_choice.html thats pretty interesting. He does mention alloy though - can I assume that copper is o.k with iron blocks? he does state copper rad's were not used when aluminium engines were being used. I guess plastic is the safe bet. just not as asphetically pleasing as copper or stainless steel!

ElusiveStranger · Posted: Mon Jul 30, 2007 6:24 pm Post subject:

Si,

Are your fans on all the time, or almost all the time? Every thing I read about rads in the back mentions "fans are on on freeways/motorways"

My answer - nope!

Go for it

Use anti-vibration mounts, fully box in the rad. To seal the airflow around mine (mounts/sheet metal/rad) I actually used duct tape. I used ally (easy to cut) between the top hat sections above the chassis rails - just pop riveted

My rad cradle is in "show us yer rads" - might help you with your planning. If I were to do it again I might be tempted to have the rad low point at the back & high at the front.
Yup, I lost clearance (std height van) but there's still more clearance than a normal car.
Make your scoop as wide as your chassis rails.

FYI - you can get 38mm Pirtek hose over the torsion tubes and under the top hat section on the floor without resorting to cutting metal.

The flexi stuff is good but bear in mind it creates 2 additional joints per run. I used two bits.

Plastic is cheap Wink

You aren't gonna see it either, or you could rattle can it. I couldn't find any guff on safe working pressures/temps for plastic (assuming heating stuff)
Metal will give you better cooling though (mine's 60% thick walled Pirtek, 20% Gates flexi 10% Samco for reducers)
I'm still sitting on the fence re Ally, steel, copper...
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72_bay_simon · Padawan Joined: 13 May 2006 Posts: 79 Location: Hampshire

ElusiveStranger · Posted: Tue Jul 31, 2007 9:01 am Post subject:

Alex (FTS) · Posted: Tue Jul 31, 2007 11:57 am Post subject:

I got some 38mm rubber pipe from hyphose and it was £10 a meter. Dutch hose also do the same pipe. I unfortunatly needed 10 meters so it got a bit costly.

But it is very good hose

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72_bay_simon · Padawan Joined: 13 May 2006 Posts: 79 Location: Hampshire

Some good stuff there, thanks. I have started to draw up the radiator frame. I will make this up and attach it so I can make sure I have enough ground clearance before putting an expensive radiator in it!

ElusiveStranger · Posted: Thu Aug 02, 2007 9:43 pm Post subject:

XJ40 - IRO £25 on flea bay, auto (oil cooler built into 'side bits') or manual transmission.
45mm inlet 38mm outlet.
Samco do a 45 -> 38mm 90° reducer for approx £15.

I will take a photo of mine and post it soon!
_________________
The advice you receive on here is worth the paper it's written on.
Your experiences are worth shed loads to others, including the f'ups - live and learn.
Wouldn't YOU rather learn by someone else's mistakes? So would they.

'78 Bay, 2 litre 091 box, EJ20 NA & the ashtray's on the 'right' side.
I don't lean forward for hills any more Grin

Bugger, missed out on "Live fast, die young"

72_bay_simon · Padawan Joined: 13 May 2006 Posts: 79 Location: Hampshire

thanks for that but my plan is to use the TSR radiator that is presently fitted in the back of my bus. This already has 2x16inch fans fitted and keeps things pretty cool despite being mounted in the back. I reckon mounted underneath with better air flow it should work a treat.

ElusiveStranger · Posted: Fri Aug 03, 2007 8:55 am Post subject:

Well if it works anything like mine your fans won't be on all the time on m/way cruising. Grin

Fingers crossed for ya.
_________________
The advice you receive on here is worth the paper it's written on.
Your experiences are worth shed loads to others, including the f'ups - live and learn.
Wouldn't YOU rather learn by someone else's mistakes? So would they.

'78 Bay, 2 litre 091 box, EJ20 NA & the ashtray's on the 'right' side.
I don't lean forward for hills any more Grin

Bugger, missed out on "Live fast, die young"