heinrich

DR

Hi Ken,

>DR, So people have used true vacuum pumps (not stock smog pumps) with good results? Or no?

I haven't seen first hand anyone that has done this with good results, or certainly anyone who has done this and the results warranted the effort. But, to be honest I have only seen 4-5 attempts at this in person, so I am by far NOT an expert or authority on the subject.

The only people I personally know that have used electric or Power-assisted Vacuum pumps with good results were Hot Rodders who used them for vacuum for their accessories etc, on street cars that had such radical cams there was no vacuum at idle :-) Oh, and one guy with a 6-71 Blower in a V8 Pinto dragster.... scary ride, especially with the Lincoln Locker on the city streets of Asheville!

Z

It's a very clever strategy. Other drivers always lift off the throttle when they see the smoke, and you just keep your foot to the floor and keep going.

That last part of the above quote was worth repeating.

DR

Hi Z,

>It's a very clever strategy. Other drivers always lift off the throttle when they see the smoke,
>and you just keep your foot to the floor and keep going.

There was approx. 17 of us in 928s terrorizing the S-2000 Club and a few bikes on Deals Gap.. We work doing a return pass thru the gap and about 20 turns (there are 318 turns in 17 miles :-) into it at 90% "anger" we were coming around a blind turn in a 4 wheel drift and was suddenly and literally enveloped in smoke... and OH YES, I LIFTED ..... for just a second :-)

Seriously it was so bad our first impression was someone had wrecked and caught on fire, second impression was blown engine.

bcdavis

I had that same problem when I first had my exhaust vent system done directly off the crankcase, without going to a catch can/oil seperator first. Man, I felt like James Bond with a smokescreen... The semi-cool thing is that the "smokescreen" only came on when I really hit the gas hard! So yes, I would say that many of the early cars with some miles on them, do indeed dump some oil mist. And if you are venting it into the intake, it is undoubtedly fouling your injectors, reducing octane, etc...

heinrich

Yeah ... I had that from the throttle body

Mike87S4

PorKen,
It's possible that you may be able to find a fitting that does not require the removal of any metal from the existing airpump mount but here in the wild north of Australia you take what you can get. Another alternative to investigate would be a different model pump with a different inlet/outlet arrangement from memory there are 3 different types available. I tried to borrow my father's camera but his was dead also. The cats were gutted by the PO.
Everyone,
I had read PorKen's adventures with his exhaust venturi evac system and did not recall mention of an excessive smoke problem, in fact it was Porken who made me aware of the GZMS pump. In searching the archives I did read accounts of excessive smoke but perhaps incorrectly assumed an air/oil seperator was not used.
My motivation for installing this system was the pool of oil I found in the throttle body and the thick coating of crap in the intake runners and inlet tract except where the injectors spray. When combined with the high ambient temps, high humidity (around 90% for 7 to 8 months of the year) and the generally poor quality fuel locally available I thought it worthwhile to attempt to correct any possible degradation of the quality of the fuel /air charge.
My motor has 87,000 km's and on removal of the heads to change the gaskets was found to be in almost perfect condition. I should state that these km"s were travelled in Japan not here.
So far this has cost me about $500 Aud and my time, a relatively insignificant amount compared to what I have already spent bringing this car to a standard I will be happy with. The only thing I have changed permanently is the removal of a small crescent shaped amount of metal about 5mm x 15 from the rear arm of the airpump mounting bracket and a smaller amount from the bottom of the adjusting bracket (to clear the AC pulley).
Should the air/oil seperator prove ineffective, turning the car into a mosquito fogger (not necessarily a bad thing around here) or the system should in any other way fail to perform, I will report it to the list.
I had purchased all the factory hoses etc to refurbish the stock system before attempting this install, so should all else fail, re installing the stock system remains a viable option.
Regards,
Mike Egan

heinrich

Mike, nice work either way

Mike87S4

Thanks heinrich, I hope it works but if it doesn't to quote Ned Kelly's famous last words "such is life".
regards,
Mike Egan

Mike87S4

Sorry to hijack this thread but I found an old logitech camera, I'm not sure these photos are worth uploading so I wont start a new thread.



You may be able to make out the material removed from the rear mount. The grey stuff is Devcon used to hold the spacer in place for ease of fitting.



This is a mock up to show the pulley and front hose arrangement.

http://forums.rennlist.com/upload/seperator1.jpg
http://forums.rennlist.com/upload/seperator2.jpg

Again apologies for the quality of the photos, the camera has no flash and these were taken with the brightest light I had. When I have my camera repaired and the car running I will start a new thread on this subject.
Regards,
Mike Egan

John Veninger

Hijacking continues.

Here is some nice info about using a vacuum pump.

Using a pump

heinrich

Not bad pics Mike Very clean instal too.

PorKen

I was able to clean them a little...

CMW

I am planning to post some pics from the SC instal project tonight as I start to reveal infor about the car prior to doing the final completion on Sunday. In the post you will see the way the SC kit vents the oil. Curently it goes to a catch can but it will eventualy be routed to the air pump filter I think.