The "flame trap" is a small cylinder that kind of looks like a large, fat fuel
filter. It is simply a small can with a wire gauze (like a piece of steel
wool) in it. It stops a back fire from the carb from igniting all of the gas
and oil vapor in the crankcase. A PCV valve works in the same way except that
it is an actual valve that is sucked open by engine vacuum, whenever engine
vacuum stops, a spring closes the PCV valve. When there is a backfire,
pressure momentarily builds up in the intake manifold (and thus there is no
vacuum) and this closes the valve.
To do what you what you want to do, you need a hose from the crankcase
breather pipe to one of the air cleaners. Or, drill a hole in the intake
manifold, tread it and screw in a PCV valve.
I have not seen a flame trap for sale, but if you can find a junked Sunbeam
Arrow or '69 Alpine GT, you will find one on the hose that runs from the
aircleaner to the valve cover.
Jan
Ron Tebo <tebomr@cadvision.com> wrote:
Jan:
I have a Series I (with Series II engine and twin Zeniths) and would
like to install positive crankcase ventilation. Can you tell me what the
"flametrap" you mention looked like, or how it was constructed? I have
never seen one and would like to get one if they are available (or make
one if they are not).
Ron Tebo
Jan Eyerman wrote:
>
> By "GT", I am assuming that you mean a 1969-70 model (the mini-Barracuda).
> Regarding question #2... there was a small tube coming out of the side of
the
> oil filler neck that connected to a small metal flame trap and then to a
hose
> that went to the air cleaner. The side plate had no tube or any other
> breather. The engine vacuum to a certain extent sucked the fumes out of
the
> crankcase and pulled them into the engine to burn them.
>
> Interestingly, this was not a new thing. Some old Austins and other BMC
> products of the fifties did this also-they claimed better gas mileage.
>
> Jan Eyerman
>
> MrZAG57@aol.com wrote:
> In a message dated 10/14/2001 8:56:17 AM, milano164@mediaone.net writes:
>
> << I just started disassembling a GT motor which I came across and noticed
> a couple of unusual items. Perhaps somebody can shed some light on these.
>
> 1) The Aluminum oil pan does have a baffle system similar to the steel pan
> (which could be better). The oil pan bottom is flat, I always thought the
> bottom was angled.
>
> 2) There is no crankcase ventilation tube coming out of the side tappet
> cover. How do they ventilate the GT normally?
>
> This is somewhat appealing since on my race motor baffles had to be
> welded in to prevent oil splashout... also I have a separate catch bottle
> for this tube. >>
>
> Hi Steve,
>
> Both Jarrid and I, and maybe others, use this pan on our race motors. I use
> it because it is aluminum and will shed heat quicker. The baffles seem to
be
> adqeuate as I have ran the hell out of the "Big Motor" and had no issues
with
>
> oil pressure loss in the corners.
>
> Eric
>
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