Bonnet vents

[Chilliman]

Argent said:

..........even though it does look a bit Chimpy.

A.

Not biting

[Bluebottle]

more ways to do it than the Fibreon route, which ihmo doesn't like right.
As Ian said earlier i have chain drilled the bonnet lip that faces the windsheild, and also raised the bonnet catch to create a perminant 1/2 inch gap to allow the air flow to escape the top of the engine bay. I did this primarily to reduce front end lift at speed, which it does, but also to keep engine/engine bay temps down...it works too well, I have to cover up half the radiator in the winter to prevent the engine temp dropping so low the stat snaps shut, and that with a supercharged race engine.
On the down side in stationary traffic it still keeps the engine at 80 deg top but, ambient engine bay temps get high, especially around the charger and PAS pump under it. Deano on here installed bonnet ducts from the supercharged Jag XKR directly above the alternator/pas pump locations which worked well and look very tidy.
Bonnet vents
I'll try and hook out a pic of them installed.

Edited by Bluebottle on Saturday 27th October 11:43

[Chilliman]

spend said:

Venting is a fairly complicated issue, I would advise firstly sticking tell-tales all over the front end & going for a drive with video camera to log the results.

Solutions are all different depending what you wish to achieve:
- bonnet lift
- lift at speed
- drawing air through rad (ie drawing exit cleanly)
- allowing intrinsic heat from manifolds etc to escape whilst slow/stationary
-keeping engine cool for power at chat / drag stripping...
Not looking like a 'Chimp'
Having a cool bonnet - like a Chimaera
Telling yourself 'Feck I've bought the wrong car, those Chims are such a cool looking motor'
Why does my iconic TVR look like a wheelbarrow when viewed from the rear
Why are all the other Griff owners I've met old and can't drive properly
Why are all the Chim owners I've met cool guys with fast cars and have stunning women dripping off them
Why am I reading this tosh when I could be out driving my Griff
Why am I reading rubbish written by one of those Chimp idiots
.....

[spend]

Chilliman said:

spend said:

Venting is a fairly complicated issue, I would advise firstly sticking tell-tales all over the front end & going for a drive with video camera to log the results.

Solutions are all different depending what you wish to achieve:
- bonnet lift
- lift at speed
- drawing air through rad (ie drawing exit cleanly)
- allowing intrinsic heat from manifolds etc to escape whilst slow/stationary
-keeping engine cool for power at chat / drag stripping...
Not looking like a 'Chimp'
Having a cool bonnet - like a Chimaera
Telling yourself 'Feck I've bought the wrong car, those Chims are such a cool looking motor'
Why does my iconic TVR look like a wheelbarrow when viewed from the rear
Why are all the other Griff owners I've met old and can't drive properly
Why are all the Chim owners I've met cool guys with fast cars and have stunning women dripping off them
Why am I reading this tosh when I could be out driving my Griff
Why am I reading rubbish written by one of those Chimp idiots
.....

Have you ever made a single post that was actually worth reading? So why the inane graffiti on a sensible posting....

Enjoy what PH has become....

[Chilliman]

spend said:

Chilliman said:

spend said:

Venting is a fairly complicated issue, I would advise firstly sticking tell-tales all over the front end & going for a drive with video camera to log the results.

Solutions are all different depending what you wish to achieve:
- bonnet lift
- lift at speed
- drawing air through rad (ie drawing exit cleanly)
- allowing intrinsic heat from manifolds etc to escape whilst slow/stationary
-keeping engine cool for power at chat / drag stripping...
Not looking like a 'Chimp'
Having a cool bonnet - like a Chimaera
Telling yourself 'Feck I've bought the wrong car, those Chims are such a cool looking motor'
Why does my iconic TVR look like a wheelbarrow when viewed from the rear
Why are all the other Griff owners I've met old and can't drive properly
Why are all the Chim owners I've met cool guys with fast cars and have stunning women dripping off them
Why am I reading this tosh when I could be out driving my Griff
Why am I reading rubbish written by one of those Chimp idiots
.....

Have you ever made a single post that was actually worth reading? So why the inane graffiti on a sensible posting....

Enjoy what PH has become....

Gosh, sorry spend, didn't mean to upset anyone. Please accept my apologies.... Your first sentence is a bit harsh

Chilli

ETA: Having given this a bit more thought, what i should have said is 'spend, I think you're an arrogant with no sense of humour.... That said, I recognise and appreciate your technical knowledge and experience

Edited by Chilliman on Saturday 27th October 16:42

ETA

Suggest you chill out and have a beer!

Edited by Big Al. on Saturday 27th October 17:58

[LordGrover]

Chilliman. You want to watch yourself.

[2 sMoKiN bArReLs]

Play nicely. There's always been banter, always will be.

[LordGrover]

There's banter and there's calling someone an arrogant . That is out if order IMO.

[2 sMoKiN bArReLs]

LordGrover said:

There's banter and there's calling someone an arrogant . That is out if order IMO.

Of course it is. I was posting to all!

[clive f]

Chilliman said:

ETA: Having given this a bit more thought, what i should have said is 'spend, I think you're an arrogant , with no sense of humour.... That said, I recognise and appreciate your technical knowledge and experience

Edited by Chilliman on Saturday 27th October 16:42

getting fed up with decent topics being turned into complete drivel, get a grip Chilli.

[black and green]

Back to topic - will slotting the returned back edge of the bonnet increase airflow when stationary with the radiator fans running sufficiently to justify the effort?

spelling edit..

Edited by black and green on Saturday 27th October 17:48

[Bluebottle]

black and green said:

Back to topic - will slotting the returned back edge of the bonnet increase airflow when stationary with the radiator fans running sufficiently to justify the effort?

spelling edit..

Edited by black and green on Saturday 27th October 17:48

[black and green]

Bluebottle said:

Thanks - I think I might see if I can use a router to make slots. I haven't got the patience to mark out and drill so many holes!!!

[Chilliman]

Fair enough guys, wasn't my intention to spoil the thread, and apologies for the disruption, won't happen again.

[infinity]

Looking at the above picture with the drilled holes, i remember a Dutch guy who made a piece of metal (strip) on the inside of the backside of the bonnet (to keep the strength) with long sleeves in it (and of course also in the GRP;-). Looked ok to me, didn't spoil the design and seemed to function very well. If the fans are blowing the hot air must be able to escape and when driving the wind pulled/sucked the hot air out through them. And as said before, it kind of heated the windscreen as well ;-)

Edited by infinity on Saturday 27th October 19:57

[GTRene]

isn't there also the intake of cool air for the ventilation in the car (in front of the windscreen)

if so, it then can suck heat/fumes from under the bonnet into the cabin...
but forgot where the cold intake (air for interior) come from...

just seen a close up picture, there is no seal under the bonnet at the end like say a BMW has to stop heat/fumes get straight into the cabin fresh air entry right behind the seal/rubber (bmw)...

So I guess TVR gets the air from another point? so then there is no problem drilling holes if so.

Edited by GTRene on Saturday 27th October 23:26

[GTRene]

there are a lot using the nice styled chim bonnet vents, I think those are the best options (in sight)

[infinity]

I agree that the chimaera-vents look the most TVR-original-like. However, i think one of the main strengths of the Griff-design is its "cleanliness" (sorry if this is not a proper English word) Peter Wheeler even removed the doorgrips and the fillercap because of this as opposed to the original prototype (the dark-blue one with the S-interior)

To me this pureness is one of the reasons why it is among my favorite and even iconic designs of all times, and prbably will be for the next 40 years. I don't want to fuss with looks of icons, but i do want to get rid of the heat built up under the bonnet, that is why i am atrracted by solutions on the back of the bonnet.

[wargriff]

On one of my visits to Dulford there was a metallic blue Griff with 3 half moon vents cut in each wing. The vents were set just forward of the door start point. The curve of the vents followed the door/wing recess perfectly and as they got smaller as they went closer to the front, they also looked great. The guy had them meshed behind to stop anything going in.. I would assume this would allow good airflow through the engine bay also. If possible I will try and find some of the pics I took.

[DarkMatter]

GTRene said:

isn't there also the intake of cool air for the ventilation in the car (in front of the windscreen)

I think the 'cool' air intake draws air through the nearside wing, which is why it's always hot by the time it reaches the cabin. If you look in the footwell by the battery you'll see the little flap which switches from 'fresh' air to recirculated air.