Extra cooling?
Discussion
Having got caught in many traffic jams at Le Mans last week I am very concerned about the underbonnet temperature!
Looking in the engine bay there is a lot of space between the radiator/fans and the front of the engine.
Has anyone experimented with a Tuscan-style bonnet, turning down after the engine towards the bottom of the rad so as to let the air flow through the radiator and out, thereby not adding to the engine temperature?
It looks like the lower air scoop at the front directs air past the rad so as to give cool air direct to the engine so the exhausts/external engine should still get some 'breeze'.
Or am I just going to get flamed for suggesting a change to the shape of the Cerb?
Incidently, I saw a Cerb at LM with a scoop on the bonnet to let out heat... Not too sure about that one!
Looking in the engine bay there is a lot of space between the radiator/fans and the front of the engine.
Has anyone experimented with a Tuscan-style bonnet, turning down after the engine towards the bottom of the rad so as to let the air flow through the radiator and out, thereby not adding to the engine temperature?
It looks like the lower air scoop at the front directs air past the rad so as to give cool air direct to the engine so the exhausts/external engine should still get some 'breeze'.
Or am I just going to get flamed for suggesting a change to the shape of the Cerb?
Incidently, I saw a Cerb at LM with a scoop on the bonnet to let out heat... Not too sure about that one!
For me the biggest culprit is the heat from the exhaust manifold building up in the engine bay when sitting stationary and not the heat from the rad.
I was thinking about fitting an additional fan, or two, somewhere in the engine bay which would run all the time and keep a flow of outside air forced around the engine bay reducing heat build up. Initially I had envisage a fan similar to the ones used in the cooling trays within equipment cabinets but not running a full speed, maybe connected in series to reduce ware and noise.
Having said that I think most of these type of fans are more on the 240V side of life.
I was thinking about fitting an additional fan, or two, somewhere in the engine bay which would run all the time and keep a flow of outside air forced around the engine bay reducing heat build up. Initially I had envisage a fan similar to the ones used in the cooling trays within equipment cabinets but not running a full speed, maybe connected in series to reduce ware and noise.
Having said that I think most of these type of fans are more on the 240V side of life.
shoggyraminator said:
For me the biggest culprit is the heat from the exhaust manifold building up in the engine bay when sitting stationary and not the heat from the rad.
I was thinking about fitting an additional fan, or two, somewhere in the engine bay which would run all the time and keep a flow of outside air forced around the engine bay reducing heat build up. Initially I had envisage a fan similar to the ones used in the cooling trays within equipment cabinets but not running a full speed, maybe connected in series to reduce ware and noise.
Having said that I think most of these type of fans are more on the 240V side of life.
Plenty of 12v low-noise ones around, but they're not really suitable for the harsh life under a Cerb bonnet!I was thinking about fitting an additional fan, or two, somewhere in the engine bay which would run all the time and keep a flow of outside air forced around the engine bay reducing heat build up. Initially I had envisage a fan similar to the ones used in the cooling trays within equipment cabinets but not running a full speed, maybe connected in series to reduce ware and noise.
Having said that I think most of these type of fans are more on the 240V side of life.
Its not the quickest job, they are a very tight squeeze getting them out. Airboxes off, undo lambdas, exhausts etc, water rails off, carefully move across the temp sensor capillary tube, undo manifold bolts, undo the front engine mounts, remove the nearside engine mount plate, jack the engine up a little and push the engine across and pull them out of the top.
Reading that it doesn't sound too bad but when I did mine the air was constantly blue!
Reading that it doesn't sound too bad but when I did mine the air was constantly blue!
Gazzab said:
The bonnet you saw may have been Deans dark blue Cerb?
You can do a number of things to reduce the under bonnet temps.
- Coat the manifolds
- fit an ally rad
- use 'wetter' water
- fit a cooling chip (see ebay)
Cheers for that. I already have Jools mod to control the dual fans. The water temp never goes above 95 degrees! I'm more concerned with the air temperature around the engine which is why I was trying to divert the air which has been heated by the radiator away from the engine to reduce the ambient level before the manifolds start heating it up!You can do a number of things to reduce the under bonnet temps.
- Coat the manifolds
- fit an ally rad
- use 'wetter' water
- fit a cooling chip (see ebay)
I recall from a previous thread on this that there were some theories abounding that although the heat was accentuated by the manifolds, part of the problem was stalled (hot) air in the area behind the engine and under the dash (where the front of the gearbox and big fuse are).
I wondered whether with some suitable pieces of hose and a couple of small, computer size fans, you could run an extractor process from that area and out through the body work just in front of the doors. while I think you could thread the hose etc, I am not certain you could move enough air at that size to make a difference!
I wondered whether with some suitable pieces of hose and a couple of small, computer size fans, you could run an extractor process from that area and out through the body work just in front of the doors. while I think you could thread the hose etc, I am not certain you could move enough air at that size to make a difference!
grahamn said:
M3John said:
- fit a cooling chip (see ebay)
Linky and more info please mate if you could be so kind.
Hi John, Austec built it into the map when they remapped mine. If you are thinking of having yours mapped it may be worth having a chat with them.Linky and more info please mate if you could be so kind.
morebeanz said:
I recall from a previous thread on this that there were some theories abounding that although the heat was accentuated by the manifolds, part of the problem was stalled (hot) air in the area behind the engine and under the dash (where the front of the gearbox and big fuse are).
I wondered whether with some suitable pieces of hose and a couple of small, computer size fans, you could run an extractor process from that area and out through the body work just in front of the doors. while I think you could thread the hose etc, I am not certain you could move enough air at that size to make a difference!
Interesting theory!I wondered whether with some suitable pieces of hose and a couple of small, computer size fans, you could run an extractor process from that area and out through the body work just in front of the doors. while I think you could thread the hose etc, I am not certain you could move enough air at that size to make a difference!
What about running some ducting from the front of the car under the air intake (or just behind the fans to force some air in when the car is at a standstill) to that area behind the manifolds. Trouble is would be difficult getting some meaningful diameter tubing to where it is needed.
markh1 said:
morebeanz said:
I recall from a previous thread on this that there were some theories abounding that although the heat was accentuated by the manifolds, part of the problem was stalled (hot) air in the area behind the engine and under the dash (where the front of the gearbox and big fuse are).
I wondered whether with some suitable pieces of hose and a couple of small, computer size fans, you could run an extractor process from that area and out through the body work just in front of the doors. while I think you could thread the hose etc, I am not certain you could move enough air at that size to make a difference!
Interesting theory!I wondered whether with some suitable pieces of hose and a couple of small, computer size fans, you could run an extractor process from that area and out through the body work just in front of the doors. while I think you could thread the hose etc, I am not certain you could move enough air at that size to make a difference!
What about running some ducting from the front of the car under the air intake (or just behind the fans to force some air in when the car is at a standstill) to that area behind the manifolds. Trouble is would be difficult getting some meaningful diameter tubing to where it is needed.
A neater solution would be to maybe use a couple of those 12v pc fans on the end of some ducting and place the intake (and the fans) directly under or to the sides of the bell housing. This would mean no ugly pipe running through the engine bay and it would also mean cold air from outside the car rather than warm air from the engine bay being used.
Why not a solution where it is possible to just lift the bonnet about an inch in the back.
My idea is that it should be possible to do from the drivers seat. At speed the bonnet should be in the original position and in traffic jams it should be possible to lift the bonnet a little in the back to let more hot air out beside it.
My idea is that it should be possible to do from the drivers seat. At speed the bonnet should be in the original position and in traffic jams it should be possible to lift the bonnet a little in the back to let more hot air out beside it.
Peppe said:
Why not a solution where it is possible to just lift the bonnet about an inch in the back.
My idea is that it should be possible to do from the drivers seat. At speed the bonnet should be in the original position and in traffic jams it should be possible to lift the bonnet a little in the back to let more hot air out beside it.
That is a good idea. I think the prototype sags had a system where when the stat reached a certain temp there was some kind of actuator that opened the bonnet vents.My idea is that it should be possible to do from the drivers seat. At speed the bonnet should be in the original position and in traffic jams it should be possible to lift the bonnet a little in the back to let more hot air out beside it.
I will see what mechanisms I can find that could suit. I am initially thinking of something like a strong electrical aerial mechanism that was mounted on the chassis rail near the fuel cooler.
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