Anyone want to swap their original airbox for a cone setup

[miket]

Someone on MX5OC wanting to trade away his intake setup - Norwich collection - looks like NA, 1.8

Opportunity for a MEV builder?

www.mx5oc.co.uk/forum/yaf_postst97590_Performance-intake-for-swap.aspx

[gwnwar]

That would be a great swap.. just need your air box and snorkel tube and hardware.. That elbow and filter sells for around $200.00
in US. If nothing else get it and resell it..

[Fin]

I bought a Typhoon air intake, and a K&N filter, all mainly for aesthetic reasons. Does it really improve performance, and  if so, how? Surely air is air, right?

[kiwicanfly]

Feb 2, 2017 12:24:01 GMT Fin said:

Surely air is air, right?

Unfortunately all air is not the same.

First there's having enough air, often stock filters reduce the air intake with obvious results.

Then there's air temperature, the colder the air the better as cold air is more dense so has more oxygen in a given volume of air.

I have a book somewhere with figures showing performance gains from changing the air filter from stock, changing the air intake position and changing the air intake runner length.

[Fin]

Just had a shuddering flashback to "O"-Level Science and Boyle's Law!

[casesensitive]

There's a simple enough table over on

www.engineeringtoolbox.com/air-temperature-volume-d_853.html

TLDR; air at 50 degrees is ~10% less dense (and less bang) than at 22 degrees.

My old Puma's air intake (K&N cone filter, no airbox, no shielding but a much improved noise) used to get up to about 50 on a warm day sat in traffic. Thing is, when you start moving, it cools down to atmospheric temperature within seconds. If you're in traffic, it's very unlikely you need Wide Open Throttle and to release all the horsies.

So those cool-air feeds people buy, ah, I dunno if they're worth the £200+ people pay for them. As an aside, anyone want the one that came with my Focus donor? :-)


Air Temperature Volume Correction Factor
(oC) (oF)
-46 -50 0.77
-40 -40 0.79
-34 -30 0.81
-28 -20 0.83
-23 -10 0.85
-18 0 0.87
-9 10 0.89
-5 20 0.91
-1 30 0.93
4 40 0.94
10 50 0.96
18 60 0.98
22 70 1.00
27 80 1.02
32 90 1.04
38 100 1.06
43 110 1.08
49 120 1.10

[tojeiro]

Feb 2, 2017 12:24:01 GMT Fin said:

I bought a Typhoon air intake, and a K&N filter, all mainly for aesthetic reasons. Does it really improve performance, and  if so, how? Surely air is air, right?

Don't worry about power gains, with the Typhoon the induction noise alone at full chat is worth the money. Properly addictive !!