odd heads ?

K4000JB · Post by **K4000JB** » Sun Nov 22, 2009 10:33 pm

i have been rumaging around in the garage and come across a pair of erc heads with what look like sensor orifices above each exhaust port. anyone shed any light on this maybe military? if they are any use to anyone let me know.

ian.stewart · Post by **ian.stewart** » Sun Nov 22, 2009 11:11 pm

Sound like air injection pipes fittings, better known as smog pipes.

K4000JB · Post by **K4000JB** » Mon Nov 23, 2009 1:33 pm

smog pipes? what would they be used for? may have come from a military landrover

kiwicar · Post by **kiwicar** » Mon Nov 23, 2009 2:10 pm

It is an air injection system that pumps fresh air into the exhaust in the hope of reducing CO emisions (ie compleet the combustion of co to co2), especially at idle, common on military derived landrovers and 101FCs (especially radio vehicles) the aim here being not the usual get it through the MOT emisions but used to give those who have to work around a vehicle that spends alot of it's time stationary and at idle longer before they get carbon monoxide poisening.
Mike

topcatcustom · Post by **topcatcustom** » Mon Nov 23, 2009 2:11 pm

I think they pump air into the exhaust to dilute the emissions, I doubt the militarty are too worried about emissions though?!

mgbv8 · Post by **mgbv8** » Mon Nov 23, 2009 5:28 pm

Dont they pump oil in as well to make a smoke shield??

Pocket rocket · Post by **Pocket rocket** » Mon Nov 23, 2009 7:43 pm

I think that's the "pulsair" system. This thread explains http://www.v8forum.co.uk/forum/viewtopi ... ht=pulsair

topcatcustom · Post by **topcatcustom** » Mon Nov 23, 2009 9:09 pm

Can't do the exhaust ports' flow any favours....

K4000JB · Post by **K4000JB** » Mon Nov 23, 2009 9:38 pm

thanks for the replies guys

bodger · Post by **bodger** » Tue Nov 24, 2009 1:55 pm

mgbv8 wrote:Dont they pump oil in as well to make a smoke shield??

now theres a thought , no more speed camera worries

kiwicar · Post by **kiwicar** » Tue Nov 24, 2009 2:36 pm

"now theres a thought , no more speed camera worries"
Just a quick squirt of artists "spraymount" over your numberplate like all the golf boys around us do.
Mike

Richard P6 · Post by **Richard P6** » Tue Nov 24, 2009 9:34 pm

I have a 'Secondary Air System' on my Audi which pumps a small amount of air into the exhaust.

One mechanic in Sheffield (owns a german car specialist garage) told me that the pump, which was faltering a little, pumped air into the inlet manifold and this heated the cats up quicker. I told him I thought he was telling me a story, but he assured me that causing this small amount of pressure in the induction system helped with emissions. I then asked that if this tiny little air pump could pressurise the induction system, why did I have to f***ing great turbochargers? before wandering off whistling the theme tune to jackanory

I digress.

It blows air into the exhaust causing a secondary burn of the gases, which both burn off any unburnt fuel, but more importantly; it gets the catalytic converters to running temperature more quickly.

spartanv8 · Post by **spartanv8** » Mon Apr 05, 2010 8:42 am

Hi
I have these holes in one of my heads that I am fitting, anyone any idea of the bolt sizes I will need to blank them off?

Thanks

Fil