Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 Front tyre pressures

When Morgan changed the OEM front tyres from Avon sidecar tyres to Blockley, did they change the recommended pressure of 22PSI? I use quite similar tyres to the Blockley, Excelsior Competition H, which I prefer as they are a bit less prone to storage flats than the Blockley. This is important to me, as my M3W is in storage for 6 months over the winter. This came to mind, as I adjusted the tyre pressures this morning, now a super easy task with my Woo-Wind rechargeable lithium battery portable digital compressor, so much better than having to drag my large and very heavy compressor up from my cellar. Presumably this little compressor is made by the same gentleman after he gave up playing the blues at his Limehouse Chinese laundry.

Wilson

Callum Frasier spoke to Blockley about their recommended tyre pressures for the M3W and they said minimum 30psi, recommended 35psi.


On standard Spax shock absorbers 35psi might prove a bit harsh but with Ohlins it's fine and significantly improves the front end grip

Hi Chris,

Thanks for the advice. That seems very high compared with the previous recommended 22 PSI on Avons. I run currently at 24 PSI cold and with the very warm ambient and tarmac temps in the south of France, I suspect that soon climbs to around 27-28 hot. When in previous years I have collect my M3W from winter storage, where it was sitting at 35 PSI all winter to minimise storage flats and I have forgotten to change the pressures after the fiddle of getting it started with a flat battery and jumper leads, when someone has unplugged my battery tender, which seemed to happen ever year, it was very skittish at those pressures. My current cleaning lady is exactly the same on plugs. She never plugs things back in again after removing them to plug in the vacuum. I have had to cover some plugs (Fibre modem, Media/storage server and the WiFi distribution controller) in red sticky tape to stop her killing the internet and NAS at the house. I suspect the Blockley/Julian's recommendations might be for racing/track days, to prevent roll off.

Wilson

I've been running 36psi in the Blockleys now for quite a while and it's a big improvement.
Somewhat counterintuitively, if you go up in small increments you might find that at about 30psi it stops improving and seems to lose feel but if you go sailing past that to 36 it improves markedly on the road and even higher on track.
With good front shocks this works very well, with standard shocks it is likely to be very harsh as the wheels get to move a fair old distance before the damping starts to try and reign in the motion.