I've got a 73 camaro with a 350 that came stock with an air pump. The previous owner disconnected it by removing it's drive belt. will this adversly affect it running? also, I am changing the carb tommorow to a Holley 4175, mech secondaries form the stock Rochester,, will this work out ok? it's a 650 CFM.
2006-08-22 19:35:27 · 6 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
The 4175 is a speadbore, Man, it's a huge carb!
2006-08-22 19:39:27 · update #1
Yea, I got an HEI waiting here too,, gonna be great,, can't wait. The car is accually a 73 vette. I was just wondering what the heck that air pump was for, it appears to push air into the exhaust valves,, what for? glad to not have to use it. Someone said that the Rochester was a 800 cfm, is that true? if so the 650 should be fine w/o jetting, do you think
2006-08-22 20:44:51 · update #2
I assume the cam and intake are stock so I'll be gentle. First, with the low compression ratio and the crappy heads on that year 350, you may have to lean out the primaries (jetting) and add headers to help scavenge some exhaust to help the burn in the combustion chamber. As well, I am assuming the ignition is stock as well. You should upgrade to a GM HEI or Mallory, MSD or another aftermarket type for more consistent combustion cycles. THIS HELPS!!! As for the air pump, take a look at what this device does. It re-circulates exhaust gasses. Not too much loss here. The loss of power is mostly from the drag of the drive belt. If you want more power, try some of the links below.
Good luck.
2006-08-22 20:16:27 · answer #1 · answered by muddytire@sbcglobal.net 1 · 0⤊ 0⤋
The air pump added fresh air to the hot exhaust gasses. The theory is the fresh air will help burn left over unburned gas in the exhaust system. Leaving this off won't do anything to the engine, but you won't pass an emissions test. I used this set up on a slightly modified 350. Aftermarket intake and mild cam up grade. Had to be careful not to open the secondaries at too low RPM or it would just bog terribly. Vacuum secondaries would have been better but I learned when to floor it and go. Good luck with the 'Vette.
2006-08-23 08:11:21 · answer #2 · answered by monte 6 · 0⤊ 0⤋
air pump worked with the emissions and will not hurt to leave it disconnected, i personally removed all the ones that I owned, the 650 will work may run a little rich at first start of the day, untill the engine warms up and you may have to buy an adapter plate for the 650 to be able to mount it to the manifold
2006-08-22 19:59:51 · answer #3 · answered by taknadvantageof 2 · 0⤊ 0⤋
just remember the Rochester is 800 cfm and the holly is 650 cfm hum which one to choose ??? as far as the air pump remember emission legal if it does not matter pump up the horses
2006-08-22 20:30:59 · answer #4 · answered by colter_bay 2 · 0⤊ 0⤋
Like any other carburetor once you get it mounted you'll probably need to jet it so you get a ignitable mixture throughout the entire movement of the throttle plate. the air injection installed correctly with a diverter valve will prevent any backfires through the exhaust on fast deceleration.
2006-08-22 20:21:31 · answer #5 · answered by bstuck2000 3 · 0⤊ 0⤋
The A.I.R. pump is allright disconnected...but the carb will only work right it if is a spreadbore design.
2006-08-22 19:38:04 · answer #6 · answered by Anonymous · 0⤊ 0⤋