Not cool enough

DaveEFI · Post by **DaveEFI** » Sat Sep 08, 2012 11:05 am

Isn't that the wrong way round? Both my cars have Sachs temperature controlled viscous couplings, and their normal mode is (near) free-wheel. They only start to increase the speed when the rad temp - ie the airflow hitting the control mechanism gets very high. My SD1 hardly very does this - my BMW quite regularly.

teamidris · Post by **teamidris** » Sat Sep 08, 2012 2:07 pm

Winching heats mine up too. There is more heat from the alternator, the rad can suck hot air in because you're stationary and the mud that you're usually sunk in reduces the air flow exit around the gearbox!

Bonnet vents seem a good choice. I run an electric fan blowing onto the carbs as they were prone to boiling up. But I'm rear rad, so there really isn't any air flow.

A good fan surround/air box is vital to get all those fins working. And every dip in the mud hole needs a good rad clean afterward. I think I spend 2-3 hours on maintenance and repair for every hour offroading

Steven 90 · Post by **Steven 90** » Sat Sep 08, 2012 4:57 pm

I will make the gap around the fan smaller, i made it big enough so when wadding the fan won't hit the cowl. To much clearance it seems

Also i wil make a "shroud"

Thanks for the reply's

Steven.

ramon alban · Post by **ramon alban** » Sat Sep 08, 2012 7:49 pm

Hello Steven, if none of the prior forum suggestions fix the problem you may wish to review and compare your system performance to that of a typical RV8 system in terms of

# unimpeded water flow through all the components,

# the ability of the system to hold 15 psi with nil air locks, and

# enabling the fan controlled airflow to efficiently extract all the heat transferred the from the engine to the radiator, especially at low road speed.

Yes I know all that is obvious but HOW to make it happen?

Read/download the PDF available from my web page

http://www.vintagemodelairplane.com/pag ... ing01.html

and discover ALL the possible associated fault conditions and how to eliminate them.

Even though your cooling system is atypical you will still be able to adapt the suggestions contained there-in.

Robrover · Post by **Robrover** » Thu Sep 13, 2012 8:18 am

These are what are fitted to a lot of Land Rover V8s in Oz in place of the OEM mechanical fan - 5.0 litre V8 EL Ford Falcon V8 twin thermo fans (1996-99 model)

http://www.ebay.com.au/itm/Ford-Falcon- ... 27b3e0608b

An easy modification as they come with integral schroud which can be trimmed down to LR radiator. These fans really kick ass pulling a huge amount of air through the radiators, much more than any of the aftermarket varieties. And they can be found cheap at any auto dismantler.