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Author Topic: lower efi intake with carb questions  (Read 6088 times)

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Offline waldo786

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Re: lower efi intake with carb questions
« Reply #30 on: December 07, 2014, 03:08:47 PM »
http://www.dmv.de.gov/forms/veh_serv_forms/pdfs/D24609_Vehicle_InspectionNEW.pdf?110711

The car is a 1976.  That's a PDF link to the inspection process here.  I live in Kent County, and for vehicles pre 1980 it is just a sniffer test at idle.  Newer cars do have to do the other rpm tests, although I just got my daily driver inspected, and they did not do any test other than plug in a computer to look at if it is running fine - t's a 2001.  I'm assuming the cat in there is an HC one but I don't know if it's ever been replaced with anything else.  The stock set up has air going into the exhaust manifold pretty high up I want to see even before the collector.  Can you tell me more about the passive pulse injection as I am not familiar with that?  I did get an adjustable cam gear, so adjusting timing should hopefully be easier with that.  Where could I get one of those a non-fouler inserts?  Thanks again, and Wittsend, I just like to know the pros and cons of things, and how much modification might be necessary.  For a daily driver, sounds like the work is maybe not worth just keeping the stock intake and using the ACE adapter.  If nothing else, others may and probably do have similar questions about the EFI intake, so this is an invaluable resource for them to find also.  I know I've learned a lot and am continuing to do so.

Offline amc49

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Re: lower efi intake with carb questions
« Reply #31 on: December 07, 2014, 10:05:19 PM »
Most '96 and later OBDII vehicles they simply go into the PCM during inspection and it will tell if anything has been out of kilter as far as emissions. Basically having a CEL tells them there is a problem there, simply having that light on is a fail inspect here.

Yours probably a HC converter only as the air injection has extra plumbing if the cat is a TWC, the air is then switched from upper at ports to the MIDDLE of the cat at full warm engine since the forward section is NOx and does NOT like extra air but the rear HC section does want it to burn better. Middle of cat then has a open air chamber for injection.

Passive pulse air injection uses no pump, it works due to the normally present exhaust pulsation in all engines, fours have them fairly strong and spaced well and they can be used to zoop air into the exhaust stream. Every exhaust positive pulse out is followed by a negative vacuum pulse, what headers use to increase power, the vacuum pulls more intake mixture into cylinder at overlap period. Using those pulses for air injection requires using one way check valves (usually reeds) that have lower values than normal smog pump ones, they must work with very light pressures. The ones off say Tempos '88-'94 work well for that, they are the low pressure ones being they used pulse air with no pump. Since no true pumping going on there they can often use two valves rather than one to increase air volume.