GregAx Posted 18September, 2014 Report Share Posted 18September, 2014 Hi, In the attempt of returning the 930 back to factory the PO had removed the air pump. I am after the air pump an related parts to complete the setup. The car still retains the spider tubing and air injectors. Any help would be great. Thanks Greg. Link to comment Share on other sites More sharing options...
Caledonian Posted 18September, 2014 Report Share Posted 18September, 2014 If nobody here has one they don't want they do turn up on eBay from time to time.... Also PP http://forums.pelicanparts.com/porsche-911-used-parts-sale-wanted/830286-air-injection-pump-filter.html Link to comment Share on other sites More sharing options...
GregAx Posted 18September, 2014 Author Report Share Posted 18September, 2014 Thanks, That one is of a SC which is different to a turbo. Thought i'll try PFA first before going abroad. Much appreciated. Link to comment Share on other sites More sharing options...
jnr356 Posted 18September, 2014 Report Share Posted 18September, 2014 try phil hearn at auto coupe,he may have some 2nd hand set ups Link to comment Share on other sites More sharing options...
SteamWolf Posted 19September, 2014 Report Share Posted 19September, 2014 They are actually available brand new from Repco (or they were a few years back) it was a standard bendix item used on most 80's cars. Link to comment Share on other sites More sharing options...
GregAx Posted 19September, 2014 Author Report Share Posted 19September, 2014 Spoke to Phil and he mentioned he should have all the bits lying around in storage. Link to comment Share on other sites More sharing options...
Harvs11 Posted 19September, 2014 Report Share Posted 19September, 2014 Hi, In the attempt of returning the 930 back to factory the PO had removed the air pump. I am after the air pump an related parts to complete the setup. The car still retains the spider tubing and air injectors. Any help would be great. Thanks Greg. I'm all for restoring a car back to original spec. but this has me stumped. Smog pump adds weight, uses engine power to drive it, and worst of all creates a false reading of the air/fuel mixtures and efficiency by diluting the exhaust gases. Why do you want to put a smog pump back on? Am I missing something? Link to comment Share on other sites More sharing options...
D-banger Posted 19September, 2014 Report Share Posted 19September, 2014 I'm all for restoring a car back to original spec. but this has me stumped. Smog pump adds weight, uses engine power to drive it, and worst of all creates a false reading of the air/fuel mixtures and efficiency by diluting the exhaust gases. Why do you want to put a smog pump back on? Am I missing something? Now where I have I seen this discussion before? Link to comment Share on other sites More sharing options...
GregAx Posted 19September, 2014 Author Report Share Posted 19September, 2014 I'm all for restoring a car back to original spec. but this has me stumped. Smog pump adds weight, uses engine power to drive it, and worst of all creates a false reading of the air/fuel mixtures and efficiency by diluting the exhaust gases. Why do you want to put a smog pump back on? Am I missing something? Stumped why? you answered it in your first statement (to bring the car back to original spec). Most of it's all there anyway. Also there have been numerous discussions on the effects of removing the air pump and most people do when they are going down the path of modding the car. From my research there are several posts on Pelican which prove that Hanz Mezger the genius behind the turbo wrote a whitepaper on the effects of the air pump on a turbo with the standard equipment and the results speak for themselves. Full boost comes on at 2500rpm rather than 3000rpm which is what I am seeing without the pump. Graph is on the bottom of the post below. http://forums.pelicanparts.com/porsche-911-technical-forum/748938-air-pump-76-930-a.html Link to comment Share on other sites More sharing options...
Peter M Posted 19September, 2014 Report Share Posted 19September, 2014 Am I missing something?Yes!For me Harvs nothing symbolises an unmolested car more than having a functional air pump!In reality they are harmless: don't weigh much, negligible power to run - feels like the pulley isn't actually connected to anything, in fact Porsche say it's 231hp air pump or not - and don't do anything else offensive at all. I agree, 20 years ago I would have dismantled it but I've become content and accepting in my old age.So you could say I'm almost proud of my air pump..... Link to comment Share on other sites More sharing options...
Harvs11 Posted 19September, 2014 Report Share Posted 19September, 2014 Stumped why? you answered it in your first statement (to bring the car back to original spec). Most of it's all there anyway. Also there have been numerous discussions on the effects of removing the air pump and most people do when they are going down the path of modding the car. From my research there are several posts on Pelican which prove that Hanz Mezger the genius behind the turbo wrote a whitepaper on the effects of the air pump on a turbo with the standard equipment and the results speak for themselves. Full boost comes on at 2500rpm rather than 3000rpm which is what I am seeing without the pump. Graph is on the bottom of the post below. http://forums.pelicanparts.com/porsche-911-technical-forum/748938-air-pump-76-930-a.html I suppose there are two issues here. Yes, I did answer my own question on originality. Herr Mezger answers my second question. Air pumps actually do something positive on a turbo car. Now I know. Thanks. Link to comment Share on other sites More sharing options...
FlatSix Posted 6October, 2014 Report Share Posted 6October, 2014 Well I'm in no rush to take mine off now! Link to comment Share on other sites More sharing options...
Coastr Posted 7October, 2014 Report Share Posted 7October, 2014 Yes!For me Harvs nothing symbolises an unmolested car more than having a functional air pump!In reality they are harmless: don't weigh much, negligible power to run - feels like the pulley isn't actually connected to anything, in fact Porsche say it's 231hp air pump or not - and don't do anything else offensive at all. I agree, 20 years ago I would have dismantled it but I've become content and accepting in my old age.So you could say I'm almost proud of my air pump..... I didn't know that 3.2s had air pumps? I thought the motronic took care of all of that? Incidentally, my car, as a 81 California delivered, has no air pump from stock because it has a catalytic converter and O2 sensor and the air pump wasn't part of the setup. I believe this is different to ROW cars. Link to comment Share on other sites More sharing options...
Dreamr Posted 7October, 2014 Report Share Posted 7October, 2014 HOLD ON! HOLD ON! ........Am I sensing a turnaround on how we feel about Smog Pumps?FlatSix ....... I never thought I'd see those words typed from your keyboard!Where's Russ? QUICK ....... someone tell him to read this thread! ...... along with half the other members from PFA ......SMOG PUMPS FOREVER!!!!! Link to comment Share on other sites More sharing options...
Russ Posted 7October, 2014 Report Share Posted 7October, 2014 Did you miss the bit where it spools up your turbo at 2500RPM not 3000RPM? there's no excuse on an N/A engine, it's just using power for no benefit - sorry but yours looks nice Link to comment Share on other sites More sharing options...
Dreamr Posted 7October, 2014 Report Share Posted 7October, 2014 N/A or not, it still signifies originality ........ but thanks for the compliment ... ( I think ) ..... Link to comment Share on other sites More sharing options...
FlatSix Posted 7October, 2014 Report Share Posted 7October, 2014 Yeah, no turbo, no pump. I stand by my previous comments! Link to comment Share on other sites More sharing options...
tk111 Posted 7October, 2014 Report Share Posted 7October, 2014 Yeah, no turbo, no pump. I stand by my previous comments! I concur If it ain't contributing to power output, or it doesn't pass the bling test, then it's got to go! Turbo OK N/A No Way Link to comment Share on other sites More sharing options...
Peter M Posted 7October, 2014 Report Share Posted 7October, 2014 I didn't know that 3.2s had air pumps? I thought the motronic took care of all of that?Incidentally, my car, as a 81 California delivered, has no air pump from stock because it has a catalytic converter and O2 sensor and the air pump wasn't part of the setup. I believe this is different to ROW cars.Coastr,I could just answer that only the '85 model year of the C3.2's had air pumps but there would be no context!The '84 Australian delivered cars had the 170kw ROW 930.20 engines except for the fitment of an activated carbon canister to better control hydrocarbon emissions to meet ADR's of that time. So as you say, no air pump.The '85 Australian delivered cars had the 930.26 engines that was also used in Sweden and Switzerland. Identical to the 930.20 engines but with an air pump fitted. Still 170kw as the air pump allowed the newer ADR's to satisfied without detuning the engine.The '86 cars got the detuned 152kw 930.21 engines with lower compression ratio (9.5:1) to suit the low octane unleaded that was mandated that year, catalytic converter and retarded Motronic. No air pump now required as the converter now did that job and the cleaning up of a few other emissions at the same time.With the broader introduction of 96 RON fuel, the 930.25 engine was introduced in '87 that had a retuned Motronic that restored some of the previous glory but still the lower compression ratio. (160kw)So like Dreamr says, no shame with having the air pump! Link to comment Share on other sites More sharing options...
Peter M Posted 7October, 2014 Report Share Posted 7October, 2014 there's no excuse on an N/A engine, it's just using power for no benefit - sorry Russ,I think you have to put it in the context of 1985. Porsche had to choose between adding an air pump OR reducing the compression ratio, mixture strength and retarding the ignition timing to meet the Australian Design Rule emission limits. Both approaches can achieve the required hydrocarbon and carbon monoxide reductions but one approach also guarantees drivability and power reductions. So really air pumps can be a benefit...... Link to comment Share on other sites More sharing options...
Russ Posted 7October, 2014 Report Share Posted 7October, 2014 I'll amend what I said, there's no excuse now for having an air pump/smog pump. unless you're chasing originality to the nth degree. (and/or own a turbo that you haven't made any other modifications to) but each to their own, if we all liked the same thing it'd be boring although i'm still going to have a go at people i see with smog pumps on their cars Link to comment Share on other sites More sharing options...
tazzieman Posted 7October, 2014 Report Share Posted 7October, 2014 Hans should've put one on the 917/30 ; maybe could have got the 0-100 time below 1.9s Link to comment Share on other sites More sharing options...
tazzieman Posted 7October, 2014 Report Share Posted 7October, 2014 The question is still unanswered , and posting a 1970s graph pertaining to the pre catalytic converter , primitive-turbo era 930 does not prove anything. $24 would allow some analysis http://papers.sae.org/780718/ The only proof would be a dyno , and even then you need someone who understands the results. I'll keep an open mind on this. The air pumps really do shift minimal air and on the 928 at least , only really work when the engine is cold (rich , need to reduce emissions). Keep the posts coming! Link to comment Share on other sites More sharing options...
tazzieman Posted 7October, 2014 Report Share Posted 7October, 2014 gax , what year is your 930? Potentially (on the later turbos) the air pump only works for ~60 seconds after startup from cold , the a valve reroutes the air into the cat. Thereafter the pump is a dead weight and even steals a few hp, not that you'd notice in a 930. A parts diagram for your 930 would help. Link to comment Share on other sites More sharing options...
Dreamr Posted 7October, 2014 Report Share Posted 7October, 2014 although i'm still going to have a go at people i see with smog pumps on their cars Russ, I wouldn't expect anything different ....... Wouldn't be the same if you stopped .... Link to comment Share on other sites More sharing options...
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