> It's a sound I've loved hearing ever since I was a kid (I'm 52 now). I
> figured it was because they were air cooled but I hear it coming from
> my WBX (which pleases me to no end). Even with aftermarket exhaust you
> can still hear the telltale chirp. It's seems obvious that it's a
> flat-4 thing, although I'm guessing you won't hear it from a Subaru.

Yeah, even with the waterboxer you can still hear that little
"twip-twip-twip" noise a little. If I had to guess, I'd say it's the
direct result of pushrods and rocker arms plus the H-4 configuration.
It definitely isn't there in my brother's overhead cam Subaru...

--
John Bange
'90 Vanagon - "Lastwagen"
'90 Vanagon GL - "Wiesel"