Heavily modded cossie engine with standard 2wd bonnet
#1
Advanced PassionFord User
Thread Starter
Heavily modded cossie engine with standard 2wd bonnet
I have a modded 500hp plus sapphire and now have a 2wd standard bonnet as opposed to the 4wd vented bonnet I was running previously.
Do I really need bonnet vents to release the extra heat from a big turbo?
Or will the non vented bonnet be fine?
I will heatshield the underside of the bonnet and was even contemplating jacking up and spacing the rear of the bonnet on the hinges (I quite like that look tbh)
Cheers Paul
Do I really need bonnet vents to release the extra heat from a big turbo?
Or will the non vented bonnet be fine?
I will heatshield the underside of the bonnet and was even contemplating jacking up and spacing the rear of the bonnet on the hinges (I quite like that look tbh)
Cheers Paul
#2
10K+ Poster!!
I have a modded 500hp plus sapphire and now have a 2wd standard bonnet as opposed to the 4wd vented bonnet I was running previously.
Do I really need bonnet vents to release the extra heat from a big turbo?
Or will the non vented bonnet be fine?
I will heatshield the underside of the bonnet and was even contemplating jacking up and spacing the rear of the bonnet on the hinges (I quite like that look tbh)
Cheers Paul
Do I really need bonnet vents to release the extra heat from a big turbo?
Or will the non vented bonnet be fine?
I will heatshield the underside of the bonnet and was even contemplating jacking up and spacing the rear of the bonnet on the hinges (I quite like that look tbh)
Cheers Paul
I did raise the back of my 205 bonnet as I do want vents but haven't found a satisfactory way to do it yet as the bonnet is carbon fibre and I don't want to risk a Ł1500 bonnet and get it wrong.
I don't mind the raised back look but I have had some negative comments when some people look at the car....so not everyone's cuppa but I think thats more to do with the amount of standard 1.2 saxo's and clios do it cos fast n furious innit.
#3
Advanced PassionFord User
I had the raised bonnet blocks on my RS Turbo for a while and was constantly being told at traffic lights my bonnet was open,which got annoying. My cossie is 2wd and now has 4wd bonnet and I'd say at your level of tune your best having the vents to be honest.
#4
10K+ Poster!!
Yes, I have had that too.
#5
PassionFord Post Troll
I have heard of cossies warping bonnets before but that may of been ones with no heat shielding before. AjamesC off here runs a big hp 2wd on a non vented bonnet see if he has any issues.
I'm sure the escort cossie vents make a good difference but don't know about saff
I'm sure the escort cossie vents make a good difference but don't know about saff
#6
New Owner
What no bonnet vents ban him...
I have no data to prove but anything that helps control engine bay temps is a good thing imo and lets face it bonnet vents are cool.
I have no data to prove but anything that helps control engine bay temps is a good thing imo and lets face it bonnet vents are cool.
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#9
cossie fan (unluckerly)
Never had them on mine at 500 and I'll not at 650. Never had issues with temp or paint damage to the bonnet due to heat. Mine did have the under bonnet heat deadening off a normal non vented bonnet as well
I really don't like the vents and certainly wouldn't fit a non rwd bonnet on mine
I really don't like the vents and certainly wouldn't fit a non rwd bonnet on mine
#10
New Owner
Never had them on mine at 500 and I'll not at 650. Never had issues with temp or paint damage to the bonnet due to heat. Mine did have the under bonnet heat deadening off a normal non vented bonnet as well
I really don't like the vents and certainly wouldn't fit a non rwd bonnet on mine
I really don't like the vents and certainly wouldn't fit a non rwd bonnet on mine
Last edited by Mad_Mat; 03-08-2017 at 07:16 PM.
#11
cossie fan (unluckerly)
#12
PassionFord Post Whore!!
ajamesc. I am suprised that you have never had any engine bay heat build up problems, your cooling system, fans etc must be working overtime on a hot day when you are giving it some beans!
#13
cossie fan (unluckerly)
Will we see when it's back with 650
#14
PassionFord Post Whore!!
Hope it all works out ok.
#15
cossie fan (unluckerly)
Its your personal choice but the other day when I had been out in mine which is only 450bhp and put it back in the garage I could feel the heat coming out of the bonnet vents. With 650bhp yours will probably be generating a lot more heat and I think what ever can be done to disperse it out of the engine bay the better.
Hope it all works out ok.
Hope it all works out ok.
But to be fair if there was a heat issue under my bonnet as it was you would see it in the temp gauge or damage to the paint on the bonnet
I had an oil temp gauge as well and never see that hot enough to worry about
Last edited by ajamesc; 04-08-2017 at 07:10 AM.
#16
Balls Deep!
iTrader: (4)
I think to be honest (and just my opinion) it was as much to do with styling as it was cooling when Ford designed them with vents, seen plenty of cars running good power without them (sleepers are an obvious first thought).
Raising the bonnet can actually hinder cooling and airflow so I wouldn't do that.
Raising the bonnet can actually hinder cooling and airflow so I wouldn't do that.
#17
PassionFord Post Whore!!
Like I say mate never had an issue as it was. When it's back we will see. Only way id ever change to a vented bonnet is if mark said you need bonnet vents.
But to be fair if there was a heat issue under my bonnet as it was you would see it in the temp gauge or damage to the paint on the bonnet
I had an oil temp gauge as well and never see that hot enough to worry about
But to be fair if there was a heat issue under my bonnet as it was you would see it in the temp gauge or damage to the paint on the bonnet
I had an oil temp gauge as well and never see that hot enough to worry about
What dont you like about vented bonnets?
#18
cossie fan (unluckerly)
It's more for me I like mine with the rwd lights and bonnet as that's how it came. Guess I just like the more plain look. Like the light I definitely like the orange indicators better
#19
Advanced PassionFord User
Thread Starter
I think you will be fine. You will soon know though if you monitor the intake and engine temps.
I did raise the back of my 205 bonnet as I do want vents but haven't found a satisfactory way to do it yet as the bonnet is carbon fibre and I don't want to risk a Ł1500 bonnet and get it wrong.
I don't mind the raised back look but I have had some negative comments when some people look at the car....so not everyone's cuppa but I think thats more to do with the amount of standard 1.2 saxo's and clios do it cos fast n furious innit.
I did raise the back of my 205 bonnet as I do want vents but haven't found a satisfactory way to do it yet as the bonnet is carbon fibre and I don't want to risk a Ł1500 bonnet and get it wrong.
I don't mind the raised back look but I have had some negative comments when some people look at the car....so not everyone's cuppa but I think thats more to do with the amount of standard 1.2 saxo's and clios do it cos fast n furious innit.
Will be a while till the cars up and running again anyway.
I don't mind the raised bonnet look.
I had it on my old rst too.
I know what you mean about people hating it though but comments on my own car from other people don't really bother me
Cheers Paul
#20
Advanced PassionFord User
Thread Starter
Cheers Paul
#21
Advanced PassionFord User
Thread Starter
Never had them on mine at 500 and I'll not at 650. Never had issues with temp or paint damage to the bonnet due to heat. Mine did have the under bonnet heat deadening off a normal non vented bonnet as well
I really don't like the vents and certainly wouldn't fit a non rwd bonnet on mine
I really don't like the vents and certainly wouldn't fit a non rwd bonnet on mine
Will you heat protect the underside of it?
Ceramic coat the manifold etc?
Cheers Paul
#22
Advanced PassionFord User
Thread Starter
I think to be honest (and just my opinion) it was as much to do with styling as it was cooling when Ford designed them with vents, seen plenty of cars running good power without them (sleepers are an obvious first thought).
Raising the bonnet can actually hinder cooling and airflow so I wouldn't do that.
Raising the bonnet can actually hinder cooling and airflow so I wouldn't do that.
How comes?
Cheers Paul
#23
cossie fan (unluckerly)
As it go's back together I will compartment the air filter area though and fit a cold air hose to direct air to it
Last edited by ajamesc; 04-08-2017 at 10:28 AM.
#25
Advanced PassionFord User
Thread Starter
Mine has a Ford sound deadening on it off a non cosworth sierra. But like I say mine never got hot at 500 with its gt3076. Oil / water temps good. When it's back I guess we will see. But I'd never change un less I was told I need to.
As it go's back together I will compartment the air filter area though and fit a cold air hose to direct air to it
As it go's back together I will compartment the air filter area though and fit a cold air hose to direct air to it
#26
Advanced PassionFord User
Thread Starter
Maybe just see what temps I'm getting with the bonnet sat normally then go from there then
Cheers Paul
#27
10K+ Poster!!
It all depends on the application. Car manufacturers have the ability to amend the design at that stage until it works, a manufacturer is unlikely to resort to lifting the back of a bonnet. Just because they work to their model it doesn't mean it wouldn't work but I can also see that it MAY cause issues on some cars.
The abarth 500 had the boot open the whole time for cooling and some 911's had different "boot" lid arrangements for aero and cooling.
#28
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Its your personal choice but the other day when I had been out in mine which is only 450bhp and put it back in the garage I could feel the heat coming out of the bonnet vents. With 650bhp yours will probably be generating a lot more heat and I think what ever can be done to disperse it out of the engine bay the better.
Hope it all works out ok.
Hope it all works out ok.
I can feel the heat off mine too when i put the cossie back in the garage. I always open the bonnet and leave it open. When yougo backin the garage about an hour later i can feel the heat off the cossie init.
#30
Balls Deep!
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It COULD also allow the air out the back of the bonnet and aid cooling. I can certainly see hot air (waves) at the rear of my bonnet so I know heat is getting out and my car doesn't overheat like it used to but that was more down to the header design that has now changed.
It all depends on the application. Car manufacturers have the ability to amend the design at that stage until it works, a manufacturer is unlikely to resort to lifting the back of a bonnet. Just because they work to their model it doesn't mean it wouldn't work but I can also see that it MAY cause issues on some cars.
The abarth 500 had the boot open the whole time for cooling and some 911's had different "boot" lid arrangements for aero and cooling.
It all depends on the application. Car manufacturers have the ability to amend the design at that stage until it works, a manufacturer is unlikely to resort to lifting the back of a bonnet. Just because they work to their model it doesn't mean it wouldn't work but I can also see that it MAY cause issues on some cars.
The abarth 500 had the boot open the whole time for cooling and some 911's had different "boot" lid arrangements for aero and cooling.
But you're totally correct when you say it may work on some cars and not others, I've witnessed a CAD simulation using a BMW E30 and then later tested in a wind tunnel and it made it worse but that's not to say it does for every car.... Just something to bare in mind.
Oh and I've had RST's with raised bonnets (including my own briefly) where both coolant and intake air temps where very high compared to it being fully closed.
Last edited by Karlos G; 05-08-2017 at 07:20 AM.
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Caddyshack (04-08-2017)
#31
10K+ Poster!!
I always liked your engine bay and love the inlet from filter. Is it chromed or polished alloy? In the pic there is a hose off mid way, I assume that is mid progress as unfiltered air?
Last edited by Caddyshack; 04-08-2017 at 09:14 PM.
#33
Happily retired
Do a Topspeed run with 35 sec at 100% WOT then report back Andy. You will have no probs with a 5sec squirt around the ring road whatever your Power. The vents aid cooling so if you ever intend doing a Vmax to see what it will do change the bonnet.
#34
cossie fan (unluckerly)
Can definitely see it being a factor held flat out for a long period as you have seen all these problems. Mine being used on the road with high power levels as you say impossible to hold flat out for a long period
#35
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I wonder what the small hose did? Something linked to emmisions / breather system I imagine?...or recirc but surely too small for that?
#36
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i dont have any experience of cossies but my YB powered kit car which has limited ambient air flow around the plenum sees IAT sensor temps of 60c+ when in traffic due to sensor heat soak but much less with bonnet off and ambient around the plenum.
this in itself may sound irrelevant but the heat soak effect means that it takes 2-3 seconds of charge air on the sensor (i.e NON-closed throttle) before the heat soaking is overcome and the sensor believes IAT has dropped. during that time period the ecu is retarding timing to prevent heat induced det. probably not so significant on track but definately a consideration if you want a quick getaway from the lights
this in itself may sound irrelevant but the heat soak effect means that it takes 2-3 seconds of charge air on the sensor (i.e NON-closed throttle) before the heat soaking is overcome and the sensor believes IAT has dropped. during that time period the ecu is retarding timing to prevent heat induced det. probably not so significant on track but definately a consideration if you want a quick getaway from the lights
#37
PassionFord Post Whore!!
That would suggest that the air filter is holding back the power and that open hose allows enough air in to compensate? Obviously that is unfiltered and possibly hotter air from the engine bay?
I wonder what the small hose did? Something linked to emmisions / breather system I imagine?...or recirc but surely too small for that?
I wonder what the small hose did? Something linked to emmisions / breather system I imagine?...or recirc but surely too small for that?
#38
cossie fan (unluckerly)
i dont have any experience of cossies but my YB powered kit car which has limited ambient air flow around the plenum sees IAT sensor temps of 60c+ when in traffic due to sensor heat soak but much less with bonnet off and ambient around the plenum.
this in itself may sound irrelevant but the heat soak effect means that it takes 2-3 seconds of charge air on the sensor (i.e NON-closed throttle) before the heat soaking is overcome and the sensor believes IAT has dropped. during that time period the ecu is retarding timing to prevent heat induced det. probably not so significant on track but definately a consideration if you want a quick getaway from the lights
this in itself may sound irrelevant but the heat soak effect means that it takes 2-3 seconds of charge air on the sensor (i.e NON-closed throttle) before the heat soaking is overcome and the sensor believes IAT has dropped. during that time period the ecu is retarding timing to prevent heat induced det. probably not so significant on track but definately a consideration if you want a quick getaway from the lights
Last edited by ajamesc; 06-08-2017 at 09:02 AM.
#39
Advanced PassionFord User
Thread Starter
To be fair a kit car with a yb crammed in it and they are squeezed in there very very tightly will have very different under bonnet temps to a sierra. Myself it was no issue having no vents rod I can see having an argument as he runs into problems no one else ever will as his torque and horse power levels have not been matched. But as a road car I'll be fine
Cheers Paul
#40
10K+ Poster!!
I think my little 205 engine bay is crammed tight in comparison to a Sierra. I used zircotec coating to try and help, I did the inlet too as they suggest it keeps heat out too but if I go over to the individual throttle bodies next year I don't think I will coat that.