>Thanks for the replies regarding Lotus/Caterham 7s...I
>don't think I'll be buying one quite yet, but the info
>was good.
>
>Next question: what needs to be changed/adjusted on a
>stock 6-port 13B to provide a more-or-less bulletproof
>9500 rpm redline?
>
>Pulleys, I would assume. Apex seals? Water pump?
>Air pump? Fuel pump?
Depends on what it's used for. The stock water pump WILL cavitate above
about 7,000 rpm, but that is probably only a real issue for sustained high
rpm excursions -- unlikely in a 60 sec. autocross, but a big deal at Sears
Point.
You can install carbon based apex seals, too, but a similar situation as
described above exists. The stock seals will have trouble maintaining
compression at very high rpm's, which you would notice as a drop off in
power.
The oil system can be upgraded cheaply as follows: Turbo II oil pump and
chain, shim the front oil pressure regulator, and replace the stock rear
regulator with a 3rd gen RX-7 unit. This will give you approximately 100 psi
of oil pressure.
Mazda also sells hardened stationary gears and special bearings to better
withstand high rpm situations.
The 89-91 normally aspirated rotors are also lighter and have higher
compression, and may be a good idea.
I don't know how much of this is legal in whatever category you are
considering.
Regards,
Rob Weinstock
_________________________________________________________________________
|