Malcom,
I sell them. Check out the website (www.datrats.com.au, or 203.33.35.34 if
no luck that way.
Cheers
Feral Errol
----------
From: malcolm cooper <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Re: FeralDatRat (Long)
Date: Saturday, August 19, 2000 1:17
Errol,
any idea on where these little crank pullys are available?
As for elec fuel pump I'm going back to a new stock one as I found at
7500+Rpm in top it was missing/breaking down I put this down to not
enough fuel,at top end.
But that brings up the other piont, manual pump might/probly does
cavitate at high rpm as well,just like the water pump.
OR
New idea,
Fuel tank-elec fuel pump-ice can-fuel line to engine bay-1 litre alloy
tank-elec fuel pump-to the carb's.Return line from both carbs back to
the alloy 1 litre tank.
The engine bay tank will fit up under the battery box(made to suit)
What do you think?
Malcolm
Errol Smith wrote:
>
> Justin,
> One a normal engine the crank has a 200mm pulley on the crank, a 100mm
> water pump pulley and a 50mm alternator pulley.
> (For every 1000 engine rpm, alternator 4000 rpm water pump 2000 rpm).
These
> alternator & water pump speeds are OK for mum tootling around town at
1500
> rpm in top gear with the aircon going ,1000 watt stereo cranked right up,
> headlights on etc as the alternator needs to be spinning at 6- 8000 rpm
to
> produce enough current to run all these appliances. The conventional
> alternator looses generation efficiency over about 8-10000 rpm.
>
> On a vehicle used mostly between 2000 - 7000rpm an alternator turning at
> up to 28000 rpm is like having a brake on you engine. The water pump
speed
> is a similar problem as the stock water pump starts to cavitate after
about
> 8000 rpm (4000 rpm crank speed ). This is why companies have brought out
> electric water pumps for cars, because the water pump chews the most
power
> when it is needed least. On sporting engines used through a wider engine
> speed range, you do not need the low engine speed power generating and
> cooling capacity.
>
> By fitting a half size (100mm) crank pulley, you slow the alternator and
> water pumps down to half speed reducing the amount of power these items
rob
> from your engine. (With 100mm crank pulley, engine 1000 rpm, alternator
> 2000 rpm water pump 1000 rpm). The inertia load on the engine is halved
> making it more responsive, freeing up some kilowatts that would have been
> used to spin these components at high speed.
>
> If your vehicle only has a low electrical load and is used for race or
> highway cruising most of the time, fitting a larger alternator pulley
> (100mm) will further reduce engine load.
>
> Most race cars used for sprint meetings or hillclimbs do not run an
> alternator and use an electric water pump and a thermo fan. This saves
them
> up to 5-6 Kw at 8000 rpm engine speeds from a stock fixed blade setup. I
> run a 100mm alternator pulley and small crank pulley on my daily driver
in
> city traffic using all normal accessories (stereo and heater fan etc rear
> screen demister) all the time and never have any electrical problems
even
> at night with all lights on.
>
> A normal flywheel stores energy so when you take off from a standing
start,
> even at low engine speeds the engine will not stall due to the heavy
> flywheel's inertia. With a light flywheel you have to use more engine
speed
> and a balanced clutch/throttle action to start moving. The technique
> requires a little practice at the start to get used to but also allows
> faster starts and much quicker engine response.. Also during gear
shifts,
> engine speed drops very rapidly. This means quicker shifts and reduced
> synchro loadings but requires more skill to not "miss a gear".
> The fuel pumps are electrical, internal 6 micron filter, same as the
Nismo
> item.
> Cheers
> Feral Errol
>
> ----------
> From: justin darragh <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED]
> Subject: FeralDatRat
> Date: Friday, August 18, 2000 12:42
>
> Feral,
> Could you explain the L-series crank and alt. pulleys to me. What are
they
> for. Also the flywheel, why race only? Are the fuel pumps stock fitment?
> What are your recommendations for a clutch on a turbo set-up(L16/4speed)?
> Thanx
> Justin
> ________________________________________________________________________
> Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
>
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