Now...how about some photos that show cavitation of the rotor of the water
pump.
128-5394.jpg
128-5391.jpg
128-5392.jpg
As you can see, the wheel is in good condition but on the low pressure side
of the wings there are typical signs of cavitation.
Cheers
Chris
-----Urspr|ngliche Nachricht-----
Von: Henry Frye [mailto:henry@henryfrye.com]
Gesendet: Freitag, 3. Oktober 2008 19:54
An: MadMarx; fot@autox.team.net
Betreff: RE: [Fot] Nuerburgring Nordschleife 400 km race
Chris,
With the parts on the race car, exact measurements are difficult to get at
the moment. I am running the second generation harmonic balancer kit from
Ken Gillanders. I believe he gets them from the UK. Ken, do you know what
the sizes of those pulleys are?
If you expect cavitation, it would be easy to hook up a pressure gauge as I
described below. The purpose built water pressure gauge died, so I replaced
it with an oil pressure gauge I had laying about, it works fine. Pressure is
pressure... On your next race out you can watch the gauge to see if there is
any drop at high revs. Mine does not.
> -----Original Message-----
> From: fot-bounces@autox.team.net
> [mailto:fot-bounces@autox.team.net] On Behalf Of MadMarx
> Sent: October 02, 2008 10:06 AM
> To: fot@autox.team.net
> Subject: Re: [Fot] Nuerburgring Nordschleife 400 km race
>
> Henry,
>
> can you tell me the sizes of your crank and water pump pulleys?
> I have the stock water pump with that sharp edged impeller. I
> really suspect the impeller to cavitating when turning longer
> at high revs. I hold 6000 for about 30-40 seconds in on go.
>
> Chris
>
> -----Urspr|ngliche Nachricht-----
> Von: Henry Frye [mailto:henry@henryfrye.com]
> Gesendet: Donnerstag, 2. Oktober 2008 13:55
> An: MadMarx
> Betreff: RE: [Fot] Nuerburgring Nordschleife 400 km race
>
> Are you running a stock water pump with a stock pulley? If
> so, I find it hard to believe it was cavitating with only 1/2
> liter of water loss.
>
> I run the narrow belt conversion, the water pump pulley is
> very close to stock, in not stock size, and run to 7000+ with
> a very aggressive water pump impeller and have no cavitation
> issues. I have a water pressure gauge plumbed into the block
> drain port at the rear of the block and it will show over 30
> pounds per square inch of pressure at max RPM.
>
> I routinely lose about that much water every session, I
> believe most it goes into the overflow. If I do not check the
> water until the engine is completely cool most of it returns
> from the overflow bottle.
>
> Sorry your weekend was more fuss than racing. We all have them...
>
> > -----Original Message-----
> > From: MadMarxt
> > Subject: Re: [Fot] Nuerburgring Nordschleife 400 km race
> >
> > Now the thread was burried down in the block. End of
> race - I thought
> > but after I told my hotelier about the misfit he invented a
> head stud
> > extractor while I had breakfast. With that tool it took 10
> minutes to
> > get that thread part out.
>
>
> > A half a liter water was forced out - nothing else.
> > I suppose that the water pump is spinning too fast at
> 6000 and start
> > cavitating which cause the water loss.
> >
>
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
>
> http://www.fot-racing.com
>
> Fot mailing list
> Fot@autox.team.net
> http://autox.team.net/mailman/listinfo/fot
[demime 1.01d removed an attachment of type image/jpeg which had a name of
image001.jpg]
[demime 1.01d removed an attachment of type image/jpeg which had a name of
image002.jpg]
[demime 1.01d removed an attachment of type image/jpeg which had a name of
image003.jpg]
_______________________________________________
Support Team.Net http://www.team.net/donate.html
http://www.fot-racing.com
Fot mailing list
Fot@autox.team.net
http://autox.team.net/mailman/listinfo/fot
|