air ducting/cooling temps
Discussion
dont know if this has been covered before but guess im not the first to ask.
one thing ive noticed (big downside with these cars) is the under bonnet temps and temps which get transferred back into cockpit on a run.
now it seems to me that a lot of this is caused through hot air not being able to escape under the bonnet due to lack of venting (especially when fans kick in) as the hot air simply gets pushed back towards the engine and transmission tunnel.
now ive noticed on a lot of these type of cars such as the ultima gtr to name but a few (pulsar gtir another) that they all have venting in place to allow the hot air to escape.
surely this can only be a good thing as it would lower intake temps and allow cooling to be much more efficient on a long hot run (or on track)
which brings me to my main point, im thinking of designing something similar to the ultima bonnet vent for a cerb (well mine specifically)
has anyone got any photos of something similar being done before?
and your opinions whether they be good or bad?
ideally i would like to get another bonnet to try this on rather than butcher mine so if anyones got a spare bonnet kicking about they wanna flog to me i may well be interested
one thing ive noticed (big downside with these cars) is the under bonnet temps and temps which get transferred back into cockpit on a run.
now it seems to me that a lot of this is caused through hot air not being able to escape under the bonnet due to lack of venting (especially when fans kick in) as the hot air simply gets pushed back towards the engine and transmission tunnel.
now ive noticed on a lot of these type of cars such as the ultima gtr to name but a few (pulsar gtir another) that they all have venting in place to allow the hot air to escape.
surely this can only be a good thing as it would lower intake temps and allow cooling to be much more efficient on a long hot run (or on track)
which brings me to my main point, im thinking of designing something similar to the ultima bonnet vent for a cerb (well mine specifically)
has anyone got any photos of something similar being done before?
and your opinions whether they be good or bad?
ideally i would like to get another bonnet to try this on rather than butcher mine so if anyones got a spare bonnet kicking about they wanna flog to me i may well be interested
Edited by pulsarboby on Tuesday 14th August 11:23
Edited by pulsarboby on Tuesday 14th August 11:23
Wow Pulsar all I can say is your brave!!
When I bought mine it had a "Different" vented bonnet, 2 at front, 2 at the rear just in front of the windscreen I beleive it did keep the temps down also. It had bonnet clips fitted & they also helped keep the bonnet rigid at speed, but they were cheap crap the flush fitted ones would be better. I did not like the look of it as the colour match was not that good. Along with the above the PO fitted a larger bore 4 pipe exit off the back box the hue & cry was a bit OTT.
HTH
When I bought mine it had a "Different" vented bonnet, 2 at front, 2 at the rear just in front of the windscreen I beleive it did keep the temps down also. It had bonnet clips fitted & they also helped keep the bonnet rigid at speed, but they were cheap crap the flush fitted ones would be better. I did not like the look of it as the colour match was not that good. Along with the above the PO fitted a larger bore 4 pipe exit off the back box the hue & cry was a bit OTT.
HTH
Edited by gerradiuk on Tuesday 14th August 12:29
sorry but i dont like that its far to in your face!
love the car though and a lovely colour
need to do something more subtle just to allow the hot air out
something similar to this
just above the fans so not letting any rain water drip on all the electrics yet will allow the heat to dissipate quickly
love the car though and a lovely colour
need to do something more subtle just to allow the hot air out
something similar to this
just above the fans so not letting any rain water drip on all the electrics yet will allow the heat to dissipate quickly
Edited by pulsarboby on Tuesday 14th August 12:48
yeah if he had placed the rear two vents away from where coil packs sit then it would have been ok i guess.
il take a look at scottys thing a little later
was gonna use pulsar bonnet side vents just above manifolds to let heat out there
what ya reckon? dont think they will look too conspicuous on a cerb
il take a look at scottys thing a little later
was gonna use pulsar bonnet side vents just above manifolds to let heat out there
what ya reckon? dont think they will look too conspicuous on a cerb
What actual temperatures are you seeing under the bonnet? I suspect that the Cerb bonnet vents pretty well as standard, with the big vent into the low pressure spot at the base of the windscreen and the sides being open towards the front.
It would be interesting to see if there really is a heat issue or if it is just a solution looking for a problem.
It would be interesting to see if there really is a heat issue or if it is just a solution looking for a problem.
Well it depends if its looks or function I guess ?
I had similar on a Maserati & tbh they did not look great & weren't that effective, not for me ,maybe if the they were frenched into the bonnet? If you look at the bonnet that was on mine the rear one's were quite good at releasing the heat, when stood in traffic the heat wave's shimmering in front the windscreen was almost like hey man wtf going on here lol so they did work & better than the one's I had on the Maserati which are similar to yours. The one's on this Ghibli don't seem as prominent as yours, look better ??
I had similar on a Maserati & tbh they did not look great & weren't that effective, not for me ,maybe if the they were frenched into the bonnet? If you look at the bonnet that was on mine the rear one's were quite good at releasing the heat, when stood in traffic the heat wave's shimmering in front the windscreen was almost like hey man wtf going on here lol so they did work & better than the one's I had on the Maserati which are similar to yours. The one's on this Ghibli don't seem as prominent as yours, look better ??
tbh ive not measured under bonnet temps yet but i would imagine them to be quite extreme!
after a good spirited run the intakes to the manifold are very hot but then i guess they would be seeing as there sitting right over the ex manifolds.
its just the heat from the drivetrain tunnel and cockpit seems a bit extreme to me and i would have thought its only gonna get worse on a trackday or similar
i was even considering running another kenlowe fan on underside of bonnet but all thats gonna do is circulate the already hot air
gerriad....yes i dont think those style vents would look out of place on the cerb strategically placed above the manifolds and blended in (plus ive got a few of them which saves me hunting for them)
think il be doing that and a scoop similar to the ones on the ultima
all i need now is another bonnet to butcher so if anyones got one they wanna flog me then give us a shout, doesnt matter if theres a few dinks and marks on it
after a good spirited run the intakes to the manifold are very hot but then i guess they would be seeing as there sitting right over the ex manifolds.
its just the heat from the drivetrain tunnel and cockpit seems a bit extreme to me and i would have thought its only gonna get worse on a trackday or similar
i was even considering running another kenlowe fan on underside of bonnet but all thats gonna do is circulate the already hot air
gerriad....yes i dont think those style vents would look out of place on the cerb strategically placed above the manifolds and blended in (plus ive got a few of them which saves me hunting for them)
think il be doing that and a scoop similar to the ones on the ultima
all i need now is another bonnet to butcher so if anyones got one they wanna flog me then give us a shout, doesnt matter if theres a few dinks and marks on it
pulsarboby said:
aaah just found it i think
is his the pale blue car?
if so yes was thinking of something similar to that
if your on here scotty did you do a design / how to thread on that bonnet, and have you noticed any big improvements with regard to under bonnet temps etc?
Hi Sorry on the night shift so just getting some time to catch up on here.is his the pale blue car?
if so yes was thinking of something similar to that
if your on here scotty did you do a design / how to thread on that bonnet, and have you noticed any big improvements with regard to under bonnet temps etc?
I bought the car with the car with this done to it. At first i was not too keen on it but with time i have learned to accept it and will leave it alone now as it makes my car stand out a little i guess and everyone knows it as mine
It is not to bad temp wise, The de-cats made the biggest in cabin heat difference but it still get a little hot in traffic but it is not to bad with the air con on.
Under the bonnet my car never see's above 95 degrees ever! it does also have an alloy rad but even before with a copper one it always maintains 95 degrees in heavy traffic.
As for wet weather, It is a Scottish Cerb and even in the worst down pours it is fine never had any water problems .
The racing Cerb the yellow one with the 4.7ajp also has the same bonnet and the chap who owns it says the biggest advantage with it is down force on the front end.
To add if you want a real temp reading under the bonnet i can use my infrared thermometer when i get home (3 weeks as i am just back to work yesterday
) and go a good drive and let it idle for a few mins before i put it in the garage and take a reading if you like?Edited by scotty_d on Tuesday 14th August 22:01
I looked in my history file & it seems the po looked at "Zertec" bonnets before he fitted his own , the zertec bonnet is very similar to Scottys . I have a Fernhearst flyer here & on the back it promotes the bonnet.
Zertec used to be on here ,he may still be here ?
http://www.pistonheads.com/gassing/topic.asp?t=153...
Zertec used to be on here ,he may still be here ?
http://www.pistonheads.com/gassing/topic.asp?t=153...
Edited by gerradiuk on Tuesday 14th August 22:29
cheers for that scotty, i gotta say i do like the look of that one best, it looks much better from the front than from side angle.
if you would be good enough to get those under bonnet temps for me then that would be much appreciated, il do the same with mine as is and we can compare the results.
as you say....with rain etc thats not gonna affect anything as its out the way of all the main electrical components but it will let all that hot air out easily when the fans kick in.
as tanguero said, 'i may be trying to fix a prob that doesnt exist' but anything that keeps those charge temps down and engine cooler surely can only be a good thing, so we wont know untill a few tests are carried out.
the only thing i dont wanna do is chop up my good bonnet because should i ever sell the car it would be good to give the buyer the option of either stock or modified bonnet.
gerrad....cant see any pics from those zertec bonnets, think the threads to old
if you would be good enough to get those under bonnet temps for me then that would be much appreciated, il do the same with mine as is and we can compare the results.
as you say....with rain etc thats not gonna affect anything as its out the way of all the main electrical components but it will let all that hot air out easily when the fans kick in.
as tanguero said, 'i may be trying to fix a prob that doesnt exist' but anything that keeps those charge temps down and engine cooler surely can only be a good thing, so we wont know untill a few tests are carried out.
the only thing i dont wanna do is chop up my good bonnet because should i ever sell the car it would be good to give the buyer the option of either stock or modified bonnet.
gerrad....cant see any pics from those zertec bonnets, think the threads to old
thanks guys
yep thats one hell of a nice cerb there
the vent looks very similar to scottys but i would rather make one myself if i can get a ropey bonnet off someone.
if not then whos the plasticman guy as il get a price on a pre-made one but im guessing there gonna be a fair few quid to have made up
yep thats one hell of a nice cerb there
the vent looks very similar to scottys but i would rather make one myself if i can get a ropey bonnet off someone.
if not then whos the plasticman guy as il get a price on a pre-made one but im guessing there gonna be a fair few quid to have made up
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