Ok guys here I go....I have an 88 iroc 305(lb9).
If we were looking at the engine, in the very back, right next to were I put my oil(right side), there is a pipe sticking up with a hole the size of a nickel at the end. It blows out air, but nothing is connected to it. What on earth is this? I need a new book, my Chilton is not doing the trick(lol)

Thanks again

 

are you sure its a 305 and not something else ,,,,,,like a 327? (smog tube?)

 

hmmmmm got a pic?

 

sounds like maybe one of the AIR injection pipes that was disconected by the previous owner or by accident.

 

I think it is just a stock 305. How could I tell if it is a different engine? I will try to get a pic, but I will have to find a scanner.

 

well usually the 305's have the dipstick on the passenger side but i guess some 350's have them there as well. The only way to know for sure is run the block numbers found on the back by the intake. you'll probably need a mirror to view them

 

It's definitely the Air pump fitting. It's supposed to connect to those tubes coming off your manifolds.

 

What does this air pump do? I did not see any tubes disconected.(around manifold) What kind of performance, or lack of performance would this cause?

 

Those tubes usually all join up and connect to the tube that goes down behind the engine, and to the air pump.
If it's not that I don't know what it is, especially if it's blowing air.
Maybe hook it up to the intake and take advantage of that 'extra' air! J/K
:lala:

 

one piece rms sbc's have the dipstick on the pass side

 

Can anyone tell me what the circled object is?

Thanks.

 

Maybe I could if I saw the pic of the circled object!!!!

 

Ok, I hope the pic shows up this time.

Can anyone tell me what the circled object is and what its function is?

Thanks Guys

 

Pic below

 

get another picture from a few feet further back, but i'm pretty sure its the last tube of the AIR system. which doesn't do anything but recirculate hot air into your exhuast. pointless

 

Another Pic to help.

 

That photo should look more like this:

 

What does this air check valve do? How important is it to get it the way it looks in your pic? Why would someone disconect this?

Have a good morning

 

emission delete = more HP

they didn't unhook it right at all.

 

Could this cause a code 36? Any ideas on how to fix this, to get my lost hp back.

 

my86firebird was saying that it would give you more hp that way (i think?)

someone tried screwing with emission stuff

 

when you disable the emission stuff (like the pump, air tubs, EGR vavle) you are isn't useing the HP from the motor to run the pump and all the other things with the emission system. now if you just unhook the AIR tudes the pump (i think i could be wrong fill me in if i'm wrong) the pump wants to suck more air makeing the pump pump hard and that means the pump is putting more of a load on the motor and that will eat up some HP from the motor.


i may self have only a cat on my car nothing else :-D

 

If you unhook the tube off the air pump it won't have a load on it. It should use less HP regardless of what it pulls. Think of an alternator increasing in resistance to turning as the load increases.

Another interesting point, people say electric fans and water pumps cost no hp, but if its putting more load on the engine from the alternator, obviously it is using HP.

 

Still wondering if this could cause a code 36? Is it worth fixing, or do I have a better hp this way? I cat. converter is gone as well.

Thanks,
James

 

No.

 

You are correct. Electric water pumps and fans DO present a load. However, by the nature of the load, they can be an advantage. The A.I.R. pump is a slightly different matter. The nature of its load is a little different than you might suspect.

Even though the A.I.R. pump has vanes, it isn't really a positive displacement pump. Like any centrifugaul pump, input power requirements increase at flow increases, not as pressure increases. Notice the load on your vacuum cleaner when it is running in free air. Then plug the end of the intake hose and notice the increase in motor RPM. If you really want to measure it, check the load current with an Amprobe in free air and while cavitating. You might be surprised.

The A.I.R. pump will have the same characteristics. Allowing it to run in free air will require more power. However, the peak input power is porbably no more than 1.5-2HP at peak engine RPM, so the difference (and power "increase" from removing it) will be negligible.

An electric water pump runs at a relatively constant RPM, and therefore has a constant load. It doesn't vary with engine RPM. Electric fans also operate at a relativerly constant load, unlike a mechanical fan that increases load at higher RPM. When an electric fan is set up properly, it will shut off at about 35-40 MPH road speed, freeing up all the power that would be used to turn it. Again, the load isn't significant, but it is a slight load that is turned off.

The increase in power from removing any of those (with the exception of a fixed fan blade) is less than the increase in power afforded by changing to synthetic lubes. A 350 can gain over 10HP by a synthetic fill, and I seriously dount that there is 10 HP available from the water pump and A.I.R. pump.

If you really need the space in the engine compartment, removing the A.I.R. pump is beneficial. If you're expecting noticable power increases, you're going to be disappointed. You'll gain more by converting to manual steering.

 

Learn something new everyday.