I did not run air filters all last year (I was trying out the new air
horns) and noticed a couple of things that had not happened
previouosly. I had some intake valve resession. The abrasive intake
air must have been eating away at the seats. I did race 9 races last
year without pulling the head. I also noticed that the oil gets
dirtier much quicker than when I run air filters. Cylinder walls
were also scored more than usual, but that could even be from slight
variations in tolerances. This year I am running K & N filters with
stub stacks. Joe(B)
-- "Bill Babcock" <BillB@bnj.com> wrote:
Just a guess, but you'll probably never see an effect. Not because it
isn't significant, but because racing engines don't run enough. The
CRC
was one of the longest track time events I know of other than
endurance
races. About two hours of track time including practice and
qualifying.
Say you run ten of them a year--twenty hours. I run an air cleaner
because I can, not because I think it's necessary.
-----Original Message-----
From: owner-fot@autox.team.net [mailto:owner-fot@autox.team.net] On
Behalf Of Henry Frye
Sent: Wednesday, September 06, 2006 11:46 AM
To: fot@autox.team.net
Subject: RE: [FOT] Air filter ("socks"?) for carb air horns?
Scott brings up a subject I am wrestling with at the moment.
Most serious racers teardown to refresh the engine every X number of
races, usually when a leakdown test shows it's time. I have been doing
so every off season. It is much more convenient for me, and the chance
of missing a race weekend is much less.
Running stacks sans air cleaners is a very common practice, but I have
always been concerned it reduces the life of the rings and valve
seats.
But how much???
Does anybody have any hard data on how many hours/sessions/race
weekends
before an unacceptable leakdown test happens, both with and without
air
filters?
Yet another thing to keep track of...
-----Original Message-----
From: Scott Janzen
Subject: [FOT] Air filter ("socks"?) for carb air horns?
My GT6, running twin SUs, has this very nice pair of aluminum air
horns/stacks. I've been running them open, but am concerned about the
amount of grit in a typical track environment.
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