I found this recently with documentation I had from a 1968 Porsche I own. Amazing info from 1986 Garretson report. I thought if it was pertinent to any early owner it should be decimated immediately.
I found this recently with documentation I had from a 1968 Porsche I own. Amazing info from 1986 Garretson report. I thought if it was pertinent to any early owner it should be decimated immediately.
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Curt Autenrieth
S Registry # 152
Porsches:
1.6L 2.7L
1.8L 3.0L
2.0L 3.2L
2.2L 3.4L h20 cooled
2.4L 3.6L air & h20 cooled
3.8L
I read reports of this exhaust problem back in 1965 - 1966. All 911 exhaust systems were recalled. Nice of Garritison to note it in 1986. Sorry, this is not new news.
Mike
Most people have never seen the early exchangers. Here's what they looked like.
1966 911 #304065 Irischgruen
I agree that CO exposure is a huge problem.
I carry a CO meter in my SWT. I built the sensors several years ago for an US Air Force project. I had a few prototypes left over and have been field testing. I always turn it on when I have my 4YO riding shotgun.
When the car is warm and idling stationary I have seen numbers of 120ppm CO. This is quite a high dose even for a short time. Generally at idle with a breeze I see numbers at 20-40 ppm. The OSHA 8-hour time weighted exposure limit is 28ppm. At speed I usually have a zero reading.
I was kidding with some my fellow red eyed Targa Cailf. tourers after being stuck in over an hour’s worth of Southbound HWY 1, summer, windows down, traffic…..
I was already think’n of my excuse……
‘Officer, the reason I NEED to go fast ALL THE TIME in this old car is to get fresh air circulating before I pass out’ ......
REALLY ......
Chuck Miller
Creative Advisor/Message Board Moderator - Early 911S Registry #109
R Gruppe #88
TYP901 #62
'73S cpe #1099 - Matched # 2.7/9.5 RS spec rebuild
'67 Malibu 327 spt cpe - Period 350 Rebuild
’98 Chevy S-10 – Utility
’15 GTI – Commuter
Decimated?
Or ...
Disseminated?
-Marco
SReg. #778 OGrp: #8 RGrp: #---
TLG Auto: Website
Searching for engine #907495 and gearbox 902/1 #229687
Well, now we know where some of our brain damage came from
John
Early 911 S Registry member 473
RGruppe member 445
Fraudian slip.....I was watching the Dodger game while writing and the Dodgers were decimating the Diamondbacks.....Originally Posted by Mr9146
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Curt Autenrieth
S Registry # 152
Porsches:
1.6L 2.7L
1.8L 3.0L
2.0L 3.2L
2.2L 3.4L h20 cooled
2.4L 3.6L air & h20 cooled
3.8L
Jamie- Are those CO numbers a result of normal combustion
from the tailpipe and coming into the SWT window?
Alan Domme
Austin, TX
'68 912 coupe
'16 VW Golf R
Early 911S Registry #1361
912 Registry
Alan, Yes this is stationary idle numbers with CO coming over the rear of the car into the passenger compartment. Interestingly I notice much lower numbers in the coupe. Usually less than 10ppm.
A bit of chemistry and physiology now...
CO binds to our hemoglobin in the same way that oxygen does. Oxygen binds and releases to provide whatever body part needs it at the time. CO does not release. It stays attached for almost 8 orders of magnitude longer time. Yes this means 100 million times longer. So what does this mean for exposure? A little goes a long way. It takes very little exposure concentrations over very long periods of time to effectively block the uptake of oxygen. This means you can basically suffocate (asphyxiate) yourself very slowly. Usually it is slow enough that you just start to feel tired, then sleepy, then a headache. Fresh air is required before you get to this point.
Overall, CO poisoning is a big deal in our old cars.
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