Re: Fwd: Performance Cooling Questions

["Chris DeLong" <green536@hotmail.com>]

I have a 60 degree Celsius fan switch in my car and it cost me about 15$ US.


Chris DeLong
'80 16V Ragtop
'78 'Rocco
'82 GLI
'65 Bus (ugly, but good for campin')
'61 17 window
'80 'vert
----- Original Message -----
From: Roland Johansson <scirocco@mail.bip.net>
To: Scott F. Williams <sfwilliams@worldnet.att.net>; Jonas Karlsson
<jkarlsso@metabolex.com>
Cc: scirocco-l <scirocco-l@scirocco.org>
Sent: Sunday, August 15, 1999 3:01 AM
Subject: SV: Fwd: Performance Cooling Questions


For high stressed motors there are a 70 degree Celsius thermostat you can
buy from VW Motorsport, cost about 5-10 times the price of a stock
thermostat that opens at 87 or similar.

Next thing is the thermoswitch for the radiotor, if you take the two-speed
fan switch from a VW transporter you have the possibility to either wire in
a two-speed fan or wire in your fan on the low switch, it opens at 84
degrees and closes at 76. These to things should help you run your motor
cold.

If you use your motor "only" for racing/rally you can remove the thermostat
completly and use a low temp switch.


> Jonas Karlsson wrote:
> > I don't think that the knock sensor will really hurt performance all
that much, mostly because it only retards timing when it knocks.  It might
actually help (dunno for sure) by keeping your ignition as far advanced as
allowed without knocking.

It also retards timing if a stone is hitting the oil pan etc, all mechanical
noices retards the timing. The knock sensor is a microphone and detects all
mechanical noices.

When it feels knock it retards timing and after some time it gradually
advances back from where it was before, you loose power for some time if it
kicks in.


> Yep, I'm in complete agreement with your entire explanation. What I want
to do, though, is eliminate as much of this preignition as possible before I
go to the knock sensor -which I consider inevitable, anyway.
>
> Here's a question, though. Is pinging eliminated by a ks? My engine never
actually knocks; it just sometimes sounds like a bunch of bb's are rolling
around in a bucket when under load...

Should be detected by a ks.


Okay, and now a second issue: How come the engine is more likely to ping
when at partial throttle in high gear? Intuitively I'd figure that it would
happen under WOT -that is, when there is the *most* load and heat generated.
It doesn't work out that way, though. How come?

You might run the motor leaner at part throttle than on full throttle,
knocking can be prevented by a rich mixture or water injektion...


> > Even after you get a KS wired in, you still need to do all of the other
things to keep the engine from knocking (reduce cyl head temp, higher octane
fuel, well formed combustion chamber for optimal flame propagation, etc.),
otherwise you won't see much benefit.
>
> Yeah, how can I reduce my cylinder head temperature. I've already got a
cooler fan switch and thermostat in there. I don't want to superchill the
engine, though, and not let the thing warm up. In fact, the engine never
seems to leave what I'd describe as an "acceptable" heat range.

Richen the mixture, water injektion, polish combustion chambers so carbon
has more problems building up, clean piston tops, polish piston tops.

Roland Johansson, Swedish Viking
Scirocco 1,6l RSi -82
Http://hem.passagen.se/toker



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