Induction heat shield
Discussion
I've noticed that in the hot weather (I live in Australia and summers starting early!!) my 96 Griff changes noticeably in performance as the outside air temp increases.
I plan to get a heat shield installed between the exhaust and the induction pipe/AFM.. so basically it's running parallel along the induction pipe.
What's the best material to get this done with?. A metal heat shield (even ceramic coated) will still get hot.. but is there an option to use fibreglass/GRP or even a sheet of carbon fibre. Seems to me that after a hard run where you can still feel a very cool bonnet that glass/GRP doesn't suffer from heat soak the way metal will.
Any ideas on this??
I plan to get a heat shield installed between the exhaust and the induction pipe/AFM.. so basically it's running parallel along the induction pipe.
What's the best material to get this done with?. A metal heat shield (even ceramic coated) will still get hot.. but is there an option to use fibreglass/GRP or even a sheet of carbon fibre. Seems to me that after a hard run where you can still feel a very cool bonnet that glass/GRP doesn't suffer from heat soak the way metal will.
Any ideas on this??
ACT do a silicone intake pipe now. As well as being nice and smooth on the inside so you probably get a better air flow than the standard flexi hose, 4mm of silicone gives a usefull amount of heat insulation. The induction on mine is home made but still uses the same sort of silicone hose, and the inlet air temp at the throttle body is the same as the ambiant air temp at the filter - there is negligeable heat soak.
Where abouts in Australia?
When I lived in Brisbane in the summer (over 40C everyday for nearly a month!) I wouldn't even get in my Landcruiser until the aircon had cooled it down a bit.
Having driven the Griff around Italy in the sumemr I couldnt even bare to think about driving the Griff in QLD!
(then again, I dont have A/C in the Griff!)
When I lived in Brisbane in the summer (over 40C everyday for nearly a month!) I wouldn't even get in my Landcruiser until the aircon had cooled it down a bit.
Having driven the Griff around Italy in the sumemr I couldnt even bare to think about driving the Griff in QLD!
(then again, I dont have A/C in the Griff!)
Hi.
I live in Sydney.. not as hot as Brisbane but never the less warm.
Peter, I have replaced the pipe to the AFM from the filter with very high temp silicon ducting (the original pipe was RS).. it's not that thick.. but nevertheless functional. Ideally I'd like to protect this from heat soak.
It's quite $$.. not to mention cumbersome ordering ACT bit's from here..I''ll be in the May next year and will look at things then.. so thinking of a GRP/carbon healtsheild in the interim.
I live in Sydney.. not as hot as Brisbane but never the less warm.
Peter, I have replaced the pipe to the AFM from the filter with very high temp silicon ducting (the original pipe was RS).. it's not that thick.. but nevertheless functional. Ideally I'd like to protect this from heat soak.
It's quite $$.. not to mention cumbersome ordering ACT bit's from here..I''ll be in the May next year and will look at things then.. so thinking of a GRP/carbon healtsheild in the interim.
HarryW said:
Why not buy some silverised fire blanket material and wrap it in that, it should do the trick.
Harry
That's what I've done, only with adhesive heat reflective mat made for the job. It's a reflective aluminium foil stuck to a glassfibre mat substrate, which is sticky-backed. Mine's made by 'Thermotec' or something. Seems to work OK.
GarryM said:
I'm no expert but I thought the air is travelling through the induction pipe at such a speed that heat soak isn't a problem anyway? If that's the case then your problem is down to the ambient temperature rather than heat from the engine? Sorry, no help am I?
that may be at full chat but on part throttle it is a factor.
i imagine its more likely to be the ambient temp thats causing the problem, i'd check that the ECU is seeing corect/ok temps and setting the fueling correctly. also make sure the air inlet/cover is ok in the nose. theres a few Tiv's around singapore etc and they would have similar issues?
as for the pipe, ACT is the best way. Silicone pipes with a guard (where it get near the headers) should sort any heat transfer probs.
I was even looking at running another pipe over the induction hose and having a air intake to it to cool the pipe/A-M meter etc. bit like brake duct, but with the intake hose inside...
but then i went a different route altegether!!!
Guillotine said:
I'm no expert but I thought the air is travelling through the induction pipe at such a speed that heat soak isn't a problem anyway? If that's the case then your problem is down to the ambient temperature rather than heat from the engine? Sorry, no help am I?
that may be at full chat but on part throttle it is a factor.
i imagine its more likely to be the ambient temp thats causing the problem, i'd check that the ECU is seeing corect/ok temps and setting the fueling correctly. also make sure the air inlet/cover is ok in the nose. theres a few Tiv's around singapore etc and they would have similar issues?
as for the pipe, ACT is the best way. Silicone pipes with a guard (where it get near the headers) should sort any heat transfer probs.
I was even looking at running another pipe over the induction hose and having a air intake to it to cool the pipe/A-M meter etc. bit like brake duct, but with the intake hose inside...
but then i went a different route altegether!!!
Guilotine has a good point, the problem is radiated heat, thoughs manifolds get very hot under load the air inlet pipe can get to over 100 degrees C near the exhaust manifold, Harry was spot on aluminiumised fibreglass is the way to go, we supply this in tube form or you can easily buy a small flat piece and wrap it around the pipe and wire it in place.
This isn't any old kitchen foil, this is real extra thick, added silicone content, very shiny, Marks and Spencers kitchen foil.
Actualy it's 'Tescos Luxury' and is coiled over some bubble wrap. It cost next to F**k-All and I'll wager it's far superior to anything on the market for keeping your induction charge to a minimum whilst travelling along that length of pipe.
Set to Gas Mark 7 for an hour Matey:......Job Done!
I had the idea of making a bubblewrap 'sock' to go over the AFM / throttle body / intake area on the V8S, with cold air ducted in one end to prevent heat soak. I didn't mention this for the Griff because I didn't think bubblewrap would survive the temperatures that close to the exhaust. Let me know if it works OK for you?
Hi GreenV8S
The Bubblewrap insulation has been fine, even before the ceramic coated headers and exhaust bandage. It's been in place for some 18 months now and not suffered adversely, not even from my clumsy spannering.
The Bubblewrap was applied just one layer thick and taylored to fit the contour of a 'Timmy Twosheds' silicone hose; parcel tape held it in place. The foil (extra thick; nuffin but the best) was folded lengthways into manageable stips some 6' long and about 1.5" in width. It was then a case of carefully wrapping the strips over the insulation and applying drops of superglue every 120 degrees of rotation to hold it all in place. There's probably little benefit as I've only shielded a small length of the induction path; I just like SHINY!
The Bubblewrap insulation has been fine, even before the ceramic coated headers and exhaust bandage. It's been in place for some 18 months now and not suffered adversely, not even from my clumsy spannering.
The Bubblewrap was applied just one layer thick and taylored to fit the contour of a 'Timmy Twosheds' silicone hose; parcel tape held it in place. The foil (extra thick; nuffin but the best) was folded lengthways into manageable stips some 6' long and about 1.5" in width. It was then a case of carefully wrapping the strips over the insulation and applying drops of superglue every 120 degrees of rotation to hold it all in place. There's probably little benefit as I've only shielded a small length of the induction path; I just like SHINY!
Nobody seems to have mentioned the factory part fitted to the later (post 2000?) griffs which was an aluminised fibreglass curved shield bolting on to the swirl tank mounting bolts. It follows the curve of the manifold and also protects the fan switch. It's mentioned in passing in the bible, and I ordered one from Racing Green after getting the part number from the factory for my 95 Griff 500. This, in combination with the ACT silicone hose, and the foil wrap that they also supply is the killer combo for heat soak problems.
wadesnj said:
Nobody seems to have mentioned the factory part fitted to the later (post 2000?) griffs which was an aluminised fibreglass curved shield bolting on to the swirl tank mounting bolts. It follows the curve of the manifold and also protects the fan switch. It's mentioned in passing in the bible, and I ordered one from Racing Green after getting the part number from the factory for my 95 Griff 500. This, in combination with the ACT silicone hose, and the foil wrap that they also supply is the killer combo for heat soak problems.
Anyone know where you can acquire these? Eh?
""Nobody seems to have mentioned the factory part fitted to the later (post 2000?) griffs which was an aluminised fibreglass curved shield bolting on to the swirl tank mounting bolts. It follows the curve of the manifold and also protects the fan switch. It's mentioned in passing in the bible, and I ordered one from Racing Green after getting the part number from the factory for my 95 Griff 500. This, in combination with the ACT silicone hose, and the foil wrap that they also supply is the killer combo for heat soak problems. ""
Can anyone post a photo of this???
Can anyone post a photo of this???
When you add them all up,theres quite a few thigs you can do to lessen the heat soak to the air ducting.Removing the pre-cats(can personally reccomend this),ceramic coating,silicone induction pipe or high temp resistant ducting hose,Heat resistant wrap and manifold heat shrouds.Nearly all of these could all be used together.It'd be like a fridge in that air pipe then
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