High under bonnet temps...
- Thread starter GTdan
- Start date
Pointless waste of money.
Patrick_g46
Fresh Recruit
find a way to get better air flow in under the bonnet i reckon!
Patrick_g46
Fresh Recruit
hybrid_G4E
Member +
the same prob with mine. but what would be the ideal under hood temp?
i reckon the only way to keep heat away from other engine parts is by keeping it in the exhaust pipes.
i am currently in the process of sourcing some thermal wraps, will wrap (already heatshielded the mani with a custom insulated heat shield) the downpipe & the turbo's exhaust side housing (or what ever they may call it.)
my aim is to lower the engine bay's temp as much as possible.
will probably do some air ducting (?). mine also with a civic rad, fan is mostly on while in town (i don't like that).
IMO excessive heat = more power lost.
i would love to put something like these on the side panels (with proper ducting in the engine bay to match), would prolly help as i never like the look of a raised bonnet.
.. but the idea of cutting holes fer them, in case they don't really look as good as i thought it would, is pretty scary!
i reckon the only way to keep heat away from other engine parts is by keeping it in the exhaust pipes.
i am currently in the process of sourcing some thermal wraps, will wrap (already heatshielded the mani with a custom insulated heat shield) the downpipe & the turbo's exhaust side housing (or what ever they may call it.)
my aim is to lower the engine bay's temp as much as possible.
will probably do some air ducting (?). mine also with a civic rad, fan is mostly on while in town (i don't like that).
IMO excessive heat = more power lost.
i would love to put something like these on the side panels (with proper ducting in the engine bay to match), would prolly help as i never like the look of a raised bonnet.
.. but the idea of cutting holes fer them, in case they don't really look as good as i thought it would, is pretty scary!
Last edited:
gglavin
Member +
the same prob with mine. but what would be the ideal under hood temp?
i reckon the only way to keep heat away from other engine parts is by keeping it in the exhaust pipes.
i am currently in the process of sourcing some thermal wraps, will wrap (already heatshielded the mani with a custom insulated heat shield) the downpipe & the turbo's exhaust side housing (or what ever they may call it.)
my aim is to lower the engine bay's temp as much as possible.
will probably do some air ducting (?). mine also with a civic rad, fan is mostly on while in town (i don't like that).
IMO excessive heat = more power lost.
i would love to put something like these on the side panels (with proper ducting in the engine bay to match), would prolly help as i never like the look of a raised bonnet.
.. but the idea of cutting holes fer them, in case they don't really look as good as i thought it would, is pretty scary!
get yourself a practice bonnet, see how it turns out, thermo wrap is a must for high power imo. cold air feeds & reverse scoop
munday
Member +
No point in adding vents or whatever unless you actually measure the air pressures acting on different parts of the bodywork/engine bay so you know where air will be entering/exiting.
For example on a normal car (not with a scoop like the gt/glanza) if you raise the rear of the bonnet air will actually be entering from the base of the widscreen rather than escaping from the engine bay
For example on a normal car (not with a scoop like the gt/glanza) if you raise the rear of the bonnet air will actually be entering from the base of the widscreen rather than escaping from the engine bay
Dane_Bristol
Member +
Ceramic Coating the manifold helps reduce temps cant say my engine bay is very hot even after a little go up the motorway. The Thermal Ceramic Coating really makes a big difference, its just not for everyone due to the cost ! 
I think it will do the opposite. The air travelling over the bonnet creates a surge where the bonnet is raised at the end. That drags the hot air away. I also removed one of the plates underneath my car. Just 'opening' the front allows more air flow
Just my 2 cents tbh
munday
Member +
I think it will do the opposite. The air travelling over the bonnet creates a surge where the bonnet is raised at the end. That drags the hot air away. I also removed one of the plates underneath my car. Just 'opening' the front allows more air flow
Just my 2 cents tbh
But the area at the back of the bonnet is a high pressure area, higher than under the bonnet in the majority of cars, so the airflow would be from the outside in. This is probably irrelevant on a starlet though considering the big scoop!
Removing the undertray...hmm thats a bit of a grey area. The airflow under the car is very turbulant, i would think its best to have some sort of undertray present if only to lessen the drag. Ive seen tests where removing the standard undertray of a car worsened the intercooler efficiency, with a redesigned undertray intake temps dropped from 65 to 47 degrees C.
The only way to know for sure....get testing
http://cgi.ebay.co.uk/Dwyer-Magnehe...286.c0.m14&_trkparms=66:2|65:15|39:1|240:1318
One of them with a plastic tube mounted where you want to measure the air pressure, easy peasy
:drive:
Well, I don't have a scoop so that is a difference
I think that the air travelling over my bonnet will create a surge effect where bonnet ends (and is raised), due to the fact that on highway/motorway the speed will be too high. Compare it with the wing from an airplane and the difference in pressure (only the bonnet has a different shape and there is not real air travelling under the bonnet.
I think that the air travelling over my bonnet will create a surge effect where bonnet ends (and is raised), due to the fact that on highway/motorway the speed will be too high. Compare it with the wing from an airplane and the difference in pressure (only the bonnet has a different shape and there is not real air travelling under the bonnet.