Henshaw Motor Racing ltd

21/08/2026

Mazda Rotary high flow adjustable anti oil foaming regulators

21/08/2026

We currently have some High flow anti foaming oil regulators in stock again.
A lot of R&D went into these regulators to eliminate the oil foaming when the regulator is bypassing, also we have managed to reduce the amount of pressure differential between cold start and running temperatures. This reduces the risk of oil cooler failures due to excessive pressure.
Base pressure is set @ 100psi with the option to be adjusted up to 135psi via shimming and still maintaining the full flow bypass flow rate.
Can fit directly to OEM block in place of the std piece with either Wet or Dry Sump systems.
After 30+ years in the business I shocked at how bad the OEM regulator design worked on the test rig! The sump pan baffle plate was the only a bandage to the foaming problem, this regulator fixes it proper!
Email [email protected]

19/08/2026

My old boss messaged me with a picture of a single rotor 12a we built for the university 34 years ago today!
From memory they were testing different fuels and ignition systems.
PS. Rob Dahm it only needed one counter weight!

14/08/2026

New left side alternator option for our Billet Dry-Sump kits available soon.

06/08/2026

17/07/2026

Billet DrySump with self centring bearing support

17/07/2026

This is our new self centring bearing support option for our Dry-Sump front covers. Simply assemble with the pulley sleeve on the crank snout and rotate crank then torque up bearing support cap screws giving you a perfect centre crank centre line location.
No need for offset, sloppy fitting, or removal of the front cover location dwells to obtain correct alignment so your engine will turn over properly.
We can offer this option to suit every block and application. Also available with aux drive shaft to suit mechanical fuel pump drive option. Right hand alternator mounting kit. Easy mounting engine cradles and high flow oil regulators. Henshaw Motor Racing ltd



Email [email protected] for enquires

16/07/2026

PPRE with Henshaw DrySump kit

Another new .p.r.e peripheral port quad ready to be fitted up with all its accessories and wiring for bench testing👌🏼

This particular motor is utilising a billet Henshaw dry sump front cover and sump pan, these are very compact in design and provide stable oil pressure under harsh Motorsport conditions. Another option available with our bare block or full engine packages!

Details at ppre.co.nz

16/07/2026

PAC 20bPP with Henshaw DrySump front cover

15/07/2026

MFR Rx7 book