General induction discusssion aka mines better than yours

[dave]

alloy, was a typo
too much reconing goes on in this section, when for a few quid you can go buy a thermoniter that will tell you exackly what is going on

 

[Brooky]

Yeah i have a termostat with readout for on the dash. just dont have a working engine anymore as i would test it.

Aluminium can hold heat for a long time

 

[dave]

this didnt have time to get any heat to hold,

 

[Brooky]

this didnt have time to get any heat to hold,

Why.....because it dissapated the warmth into your 'cold' air

 

[dave]

no becaue it was a freezing day, i was on rollers late, put car on rollers opened bonnet then ran it till up to tempature, then did the run

 

[GoBe]

Dave, hate to say it but you're talking about things you blatantly don't understand. The reason that ally pipe is cold is because it's working as a air/air heat exchanger. No ifs, buts or maybes, it IS.

The exhaust gasses coming off that manifold will be several 100 degrees centigrade, so if that pipe is cold then you'll find that that heat had to go somewhere. Now where could it go?.. oh yeah into the intake air. The fact it was a cold day and that pipe was cool tells me the pipe was being cooled down by the air going into the engine. This isn't reckoning, this is basic physics. Secondly the exhaust manifold will get very hot well before the engine is properly warmed up.

I know someone who got an aprox 2bhp power gain by using exhaust wrap along the inlet track over the top of that putting a heat reflective sleeve. That intake route took the air over the top of the gearbox let alone over the top of the exhaust manifold which is a lot hotter (even with the bonnet open)

 

[dave]

yeah what ever, so if i put a pan of water on the cooker it dont really take 10 minuets to boil, its really boiling straight away but just feels cold

 

[dave]

so if that pipe is cold then you'll find that that heat had to go somewhere. Now where could it go?.. oh yeah into the intake air.

how would hot air travel all the way down to bottom left of bumper? i always thought heat rises

 

[fingers99]

As ever Dave, your grasp of the laws of thermodynamics amazes me!

Hot air rises. Heat is transmitted by conduction, radiation and convection. Only the later is significantly affected by whether the heat source is below or above.

Your pan of water analogy would apply only if after (say) 5 minutes the water temperature suddenly changed from ambient to 100 degrees. You're surely not arguing that the water temperature is not rising all the time the pan is in contact with the gas (until it boils)?

For all that, I've not seen the installation prior to the GSR and can't say how much heat may have affected the result.

 

[iron chef]

Bit of carbon fibre to tickle your fancy

 

[dave]

Hot air rises.

yeah i know, so how does the hot air end up in me intake like he say then?

 

[SuicideUK]

Bit of carbon fibre to tickle your fancy

Wow, who did your rocker cover? looks nice and shiney!

Luke.

 

[fingers99]

As I say, heat is transfered by conduction, convection and radiation. We can rule out convection, conduction in this case is likely to be insignificant, which leaves radiation. To feel its effects, stand in front of a coal fire.

 

[dave]

how can that have made enough heat to make any measurable difference in such a short time?

 

[fingers99]

I've not seen the set up, so can't comment on that. But IIRC radiated heat travels at the speed of light and over a vacuum. The temperature differential would be in excess of 700C.

 

[cc1]

Anything not required to pick up heat. (Insulate).
Anything not required to reject heat. (Insulate).
Everything fluid, solid, and gas collects or transfers energy, But have different transfer rates. Aluminium and copper have the best thermal transfer, But still require fluid to maximise efficiency. Plastic/rubber has good insulation properties, Hense the GSR kit being good.

 

[randomizered]

Repeat teh test and log the IAT Then everyones happy

Kristian

 

[dave]

there are pics in my gallery
i didnt place the gsr in the normal place either, that was just sitting in top of enine bay too for a quick test, then i gave it back

 

[Whiley]

cda or the dia for me got both would rather stick with something thats had allot of money invested into it. gsr kits are good for na's though dont get me wrong!

 

[randomizered]

Or stick the CDA on the GSR