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Petrol on the air filters
https://www.ausmini.com/forums/viewtopic.php?f=2&t=9470		 Page 1 of 1
Author:  h0nk [ Tue Jul 26, 2005 2:33 am ]
Post subject:  Petrol on the air filters
I was running my carbys too rich, but can this cause petrol getting onto the air filters? I've got twin HS2's..
Author:  supercharged 850 [ Tue Jul 26, 2005 3:18 am ]
Post subject: 
Oooh, nice topic. I dont know the answer, but I have experienced it.

I too found that my old 45 weber used to soak the filters..... but I assumed it was all part of having the "power".
Author:  h0nk [ Tue Jul 26, 2005 4:59 am ]
Post subject: 
I thought it could have been cause I was running rich, and it was spitting fuel out when I went round corners on to the filters..Anyway I took the air filters and went to clean them, and they just disintegrated in the parts that had petrol on them so I'm guessing it's not good..

Does this mean my car sniffs petrol?

ha ha ha good joke me..
Author:  Lillee [ Tue Jul 26, 2005 8:51 am ]
Post subject: 
Are you running Ramflos?

Not sure about the petrol spit back thing, but if you have ramflos, oil them. This will make them A) work better, B) not decintegrate when petrol gets on them.

I am sure my Dellorto spits petrol at the filter like no tommorrow, but since I have been oiling the filter, I've had no dissintegration problems. Used to have that when I was running 1 1/4 SU and ramflo
Author:  Chris [ Tue Jul 26, 2005 9:00 am ]
Post subject: 
Thetechnical term for this is callwd standoff. It happens due to the air impilses reversing when an inlet valve is closed and happens to all carburettors. If the air filter were clear of the area in front of the carby that is affected then it would not be so evident.
Author:  fuzzy-hair-man [ Tue Jul 26, 2005 10:11 am ]
Post subject: 
I can't remember but I thought Vizard said something about being able to tune carby standoff to acceptable levels in his yellow book. It may have had something to do with what length trumpets you were using but I am guessing :oops: :oops:

backflow is a problem in exhausts if the exhaust manifold diameter is too large (less gas speed so it is easier for the gases to turn around and go back) maybe something similar applies to the carby side of it :?: :?: :?

Um doesn't petrol dilute and or disolve most oils :?: if so and you are getting fuel in your ramflow filter it might be disolving the oil in the filter and effecting the filters effectiveness :?: :idea: :!:
Author:  Chris [ Tue Jul 26, 2005 10:01 pm ]
Post subject: 
I have never read Vizard's books, but in his original articles in Car & Car Conversions he did get into it and IIRC he was linking it to ram tubes and their design. These articles were written in the mid 70's so I may be mistaken in the detail. I can't recall if he thought it a problem or he was just describing the phenomenon.
Author:  drmini in aust [ Tue Jul 26, 2005 10:10 pm ]
Post subject: 
What Vizard said was if the ram pipes or manifold was long enough it reduced or eliminated the standoff.
Bear in mind he's talking about long duration race cams though.

re oiling the Ramflo filters, the proper UniFilter or Lynx stuff resists washing out to some extent. And it has antiflammable additives in it. Not ordinary oil. and it's a bastard to get off your hands... like STP.
Author:  Chris [ Wed Jul 27, 2005 10:02 am ]
Post subject: 
drmini in aust wrote:
What Vizard said was if the ram pipes or manifold was long enough it reduced or eliminated the standoff.
Bear in mind he's talking about long duration race cams though. .


30 something years and I still remember this stuff. I just wish I still had all those mags as they were all his original writings. i gave them all to a guy who was building a mini at the time. They even had a lot of articles by Clive Trickey the original Mini maestro.
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