Air Box - dumb question
- Thread starter mikeruss
- Start date
The actual pump blows cold air and I can't see how blowing cold air into a hot exhaust helps it warm up quicker but I'm not going to argue with you two
Theres probably some very long calculations and clever stuff going on. I still think its witchcraft personally.
adam cupra 20vt wrote
The actual pump blows cold air and I can't see how blowing cold air into a hot exhaust helps it warm up quicker but I'm not going to argue with you two
The secondary air pump only works during cold starts. So the exhaust isn't hot. On cold starts the ECU enriches the mixture and more unburned fuel gets through to the exhaust side. Extra air, injected into the exhaust manifold, is needed to combine with the unburned fuel in the catalyst (this is one of the reactions the catalyst catalyses). The reaction is exothermic, i.e. it generates heat, which heats up the catalyst, which helps to make the reaction work faster, etc.
The actual pump blows cold air and I can't see how blowing cold air into a hot exhaust helps it warm up quicker but I'm not going to argue with you two
The secondary air pump only works during cold starts. So the exhaust isn't hot. On cold starts the ECU enriches the mixture and more unburned fuel gets through to the exhaust side. Extra air, injected into the exhaust manifold, is needed to combine with the unburned fuel in the catalyst (this is one of the reactions the catalyst catalyses). The reaction is exothermic, i.e. it generates heat, which heats up the catalyst, which helps to make the reaction work faster, etc.
Similar threads
