Richard was feeling sick (wanting to throw up) from being thrown around in the race car while trying desperately to concentrate on water levels in clear plastic tubes. The frame includes a rear swing frame pivotally connected to a front frame. Rear mounted radiator set-up pics and info. Not terribly scientific but worth a shot for a back-to-back test as we didn’t have any data logging as such back then - we expected the pressure inside to be relatively consistent run to run. For those whom are running rear mounted radiator, or a radiator that is front mounted but you have a rear V8, what are you using to run the plumbing? An extreme example was the BAR Honda Bonneville F1 car. In most club level motorsport people building their own cars don’t duct the air all the way to the cores of the radiators and some don’t even seal the gaps around the radiator. With a fixed point of blockage (such as a radiator) you can increase the rate of expansion beyond the normal 7 degree limit as you approach the core (aerodynamic blockage) itself. Brake Duct Flange mounts to the nose of your car using 3/16″ rivits and is rigid enough to use a I’d like this to be a simple guide to improving some parts of your race car wherever you need to provide passively induced “forced” airflow. Of course this is influenced by the speed of the vehicle, the radiator area, heat rejection etc. If you mount the radiator and its fans too close to a device pushing air in the opposite direction it can cause a stalemate with the air and in turn give you higher temperatures. I ran it like this for about 6 months, blew up another eg33 and got sick of dealing with their issues, and switched to a ej205 (at which point I changed back to a front mounted radiator to save weight. It was quite a struggle to fit them in with the roll cage but it fitted where it touched let’s say. The reference pressure would be whatever the cockpit pressure would be. We also, put in a bar on each side to reinforce the shock mount area. The driver commented that he felt like he was being blown out of the cockpit and the brakes ran well within the limits of the temperature paint we put onto the rim of the disks (unlike before). Think about what will happen on an airbox in particular if the throttles are closed. some teams run radiators at the rear of the vehicle to reduce coolant line weight or at the outlets of undertray diffusers, the most common design is a single side mounted radiator. Image taken at the Heritage Motor centre where a nice example was on display. A longer duct of low expansion angle is slightly better than a shorter duct of double the angle with a splitter, because the skin friction causes the growth of a “boundary layer” which grows at a non linear rate (fast growth at first). but that’s a good starting point. It could still house mounting points for the headlights and nose, but would give me the freedom to mount a radiator at any angle or location I wanted (within the confines of the front nose, of course). Drifting at the professional level, rear mount radiators are becoming very common. It is rare though to have enough space to do this. These rules seem to be either unknown or ignored by a lot of people coming up with a custom radiator installation for their engine conversion. Image thanks to AMR1.uk and “Vantage Summer 2014”. Classic Style Paper Covered Aluminium Ducting 60mm I.D. : Radiator Installation Design GuideIntroduction: There are a number of basic rules to designing a radiator installation which, if followed, will considerably increase the chances of your installation working properly. A bigger entry will tend (all other things being equal) to have more drag. We went to a pretty aggressive angle, of something like 15 degrees, in one plane only which was never going to stay attached but we added two splitters to control the expansion in each part of the duct to about 5 degrees. A trial fit of the driver's seat. Add to compare list Add to wishlist. So use increasing expansion as you get close to the core of the radiator. The white material surrounding the duct is an insulator. BHFLA100. The entry is a very important thing and sizing the entry is part of it. That’s a sensible starting point especially if you don’t have access to good CFD or wind tunnel testing resources. Richard had his thumb at the ready to seal the open end. Add to wish list. Add to cart. to narrow towards the rear. We simply connected wire reinforced flexible ducting (known colloquially as donkey dick): one to cool the brakes and one to blow air into the cockpit for the driver. Showroom Opening Hours: Monday - Friday 8:30am - 5:00pm Saturday 8:30am - 12pm Building a simple radiator duct and screen to make sure plenty of air – and little else like dirt – gets to your radiator. We accually run 2 rear radiators (a standard GQ one and a GQ heavy duty brass one) on the truck and 2 davis graig water pumps in conjunktion with the motors pump, with ford AU thermo fans we have found to be pretty good for the price. You can calculate the average air speed at the airbox entry that the engine will swallow at full throttle. … To be honest I think this is actually a lovely example. A seat and an engine are mounted to the frame. As with all retrofitted parts, space was at a premium. We have The engine is disposed between the front and rear wheels. Some other comments about ducting air. This accelerates the air backwards and the reaction of this acceleration against the installation provides a small forward thrust. The duct work for the radiator also incorporates a separate cold-air intake system to feed the engine. Don’t be tempted to go for a monster entry to try to “ram” air into something – it isn’t the way to go. Ducting. If that doesn’t give you enough cooling then look at ducting the air using a gently increasing expander / diffuser. It seemed a miracle from the driver’s perspective because we were picking the air up from the same place, giving him a third of the air rather than a half, but more came through. In fact, at Le Mans we lost a door on the main straight at top speed (literally blew off due to the pressure difference inside to outside) and had to reinforce the attachments! Silicone Duct Hose . Another long post from me, which I hope gives you a head start with your motorsport ducting! Air flowing near a surface is slowed – you can think of it as feeling friction. So if you have a race car hopefully it has enough power to spin the wheels up to a certain speed. If you go significantly bigger you typically pay the price of some drag. Something had to be done, and quickly. Add to wish list. Now to set the scene, this is about road going vehicles with a rear mounted radiator at sustained open road speed ... and from past vehicles I've built for the road (I solved one with ducting, one with extra radiator core (I used two radiators), and the rest with HD fans (Audi ones I think from the A4's, these fans will pick themselves up off the floor and fly! Subaru Conversion Information Resource Navigation Bar - over 160 pages of info on Subaru powered VW’s! A seat and an engine are mounted to the frame. I Hope that this can give you a head start without needing years of study. The effect on your case temps will be minor, if you can even … This was the perfect size (not luck) for two 50mm (I think) diameter ducts (on each side). Ray (Mallock) would do a lap with the non extended arrangement with Richard trying to see if there was any significant displacement of the water on the straights. Posts: 183 Rear Mounted Radiator Plumbing Setup? Add to compare list Add to wishlist. These mounts attach just in front of the radiator and offer a quick disconnect feature for a easy trailer loading. Page 1 of 2 1 2 Next > Polo Sr20 parts man! So on a publicity day when it was possible for people to have “taxi” rides it was decided that Richard Williams (our team manager) would sit in the car for a back-to-back run to assess the performance of our extended diffusers. Another duct expander/diffuser I remember well (because it was free performance, but also because it made the team manager sick [he looked a pale shade of green to me after testing]), was fitted to the Nimrod airbox entries – I will explain. Add to cart. A frame is supported on and connected to the front and rear wheels. Be careful with airboxes in particular – you cannot expand the air at a high rate and change its flow direction at the same time. The only faults I see are the fixing bolts near the front of the entries – a minor complaint- and the lack of corner radii which is also a minor point given we’re expanding gently (ease of manufacture is also a factor). use a bit of a radius at the leading edge to allow for changes of alignment. Bulkhead Flange Connector . Mount it to the front. That is also what is missing from commercially available ducts. Detmar 751 Blower, In-Line 4 Inch Intake X 4 Inch Exhaust, 12 Volt . Note that radiator ducts are different because of the blockage caused by the core of the radiator. It is quite likely that air will flow in fast where the approach air is high speed (energy) or high static pressure to start with, and will slow down or (in some cases) go backwards if there are parts of a duct entry that are being “fed” by low pressure and/or low energy air. One was for the brakes and driver cooling of the Lord Downe owned Aston Martin Nimrod (1983). This Mini picked up air for the engine from the engine bay. Hence, if you are designing a duct from scratch, play with the length and expansion rate to try to minimise the number of splitters so you get each branch of a duct down to about 7 degrees. Why expand? all 'cooling packs'. biGshiz79 . A very common problem for any UTV enthusiast is over heating due to the stock mounting location of the radiator. ?material matchingexcess cooling capacity - card over ra, Inventors of the Subaru - VW conversion bell housing using Subaru flywheel, clutch and starter, rjes.com v1.11, Copyright © R Jones, R J Engineered Solutions, 2002 - 2008.