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Flame Arrestor, Throw it Out! 700

posted by  someone claiming to be Glen on  Wed Jan 8 10:21 CST 2003 [RELATED]

I'll probably stir up some controversy here, but I have wanted to post this for a long time. I have had 7-B21F, B23F, and B230 engines in as many cars and have had to replace the front seals in most of them because of clogged flame arrestors here in Minnesota. The first thing I do when buying one of these used cars, and have done for 10-15 years, is to throw out the Flame Arrestor and replace the seals. I have never had a problem with backfires, etc.

Has anyone ever thrown out their Flame Arrestor and had a problem?? Thanks.








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    Um , what about the oil seperator? 700

    posted by  boondoggie on  Thu Jan 9 01:31 CST 2003
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    last visit: Tue Oct 23 00:37 CST 2001
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    The flame trap is hardly the biggest restriction in the PCV system.

    If you're finding a clogged flame trap, you should probably change the oil seperator underneath it was well, since it is probably clogged as well.

    I know, lotsa people never change the thing for the life of the car, since it takes more than 5 minutes to get at, and the flame trap is a nice easy target...

    -Paul Demeo
    1990 780T








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    Flame Arrestor, Throw it Out! 700

    posted by  Matt L on  Wed Jan 8 15:40 CST 2003
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    last visit: Mon Aug 23 08:46 CST 2010
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    I think this is a common practice, I have come across several cars "maintained exclusively by the dealer" where the flame trap is gone. I always re-install one though. Keep the oil changed regularly and it will be fine for a long long time.

    --
    Matt L. -- Cary, NC -- '91 740 wagon








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    Flame Arrestor, Throw it Out! 700

    posted by  chris herbst on  Wed Jan 8 13:26 CST 2003
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    It isn't likely you'll have a problem with it. I've seen a lot of cars with them removed. But if it was my car, I would put a new one in.

    I've found that the amount of junk on the flame trap is directly related to oil choice, oil change frequency, and the amount of warmed-up miles you drive. That's just anecdotal observation though.
    --
    Chris Herbst, in Wisconsin.








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    Flame Arrestor, Throw it Out! 700

    posted by  rene svastal on  Wed Jan 8 11:35 CST 2003
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    I'm not trying to pick a fight or anything, but if you change the oil as recommended AND clean the PCV system as recommended, it won't cause crankcase ventillation problems.
    I think the reason Volvo decided to abandon the flame arrestor on Turbos is because any backfire will be directed all the way to the airbox, but on the Non-Turbo cars, it's right before the throttle body, and would blow that hose apart.

    Rene
    --
    1988 745 GLE B23FT M46 (J-P Type combo). Toronto. 380000Km. Suspension upgraded and lowered . 1982 242 GLT project (B23ET LPT to be included) Also in charge of GF's 1986 244








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    Flame Arrestor, Throw it Out! 700

    posted by  invar on  Wed Jan 8 10:44 CST 2003
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    last visit: Fri Feb 26 21:00 CST 2010
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    Well, put it this way. If you have backfire without a flame arrestor, you'll have big problems.

    Just because you haven't run into a problem yet, doesn't mean you won't. I mean, my seatbelt's there, but I have yet to be in an accident that has involved the seatbelt being of use, doesn't mean I shouldn't wear it just because it causes some chafing around my neck every now and then. :)
    --
    Kenric Tam
    1990 Volvo 740 base sedan (B230F)
    My Volvo 'Project'







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