Slippery Anne Engine

[Mark Atkinson]

Hi Mark
Sounds as if it could be a lot, lot faster
than the original? Is this car for circuit racing
Or Sprints? Or Roadgoing!!!?
Bill G

Hi Bill, 

All the engine runs took place on a dyno, so as Ian suggests real world figures will be less impressive, also, while the 8200 rpm sounds impressive, the bhp drops into the 40s.  I have read that back in the day they managed 30bhp at 5000 rpm, but never managed the illusive 100mph the car was meant to achieve. My theory is that they got the aerodynamics wrong. Certainly the outer mould line looks quite good for aeros, but no effort was made to manage the radiator or cockpit airflow through the car, which must have had a drastic effect. The MSA rules may help me here, as I must fit both a firewall and a fuel tank area cover. 

Will it be faster? I think the car will be putting roughly twice the power down for any given revs, but, as the prospective drivers Peter and myself are probably adding more mass and drag than any of the original drivers, I am also slightly worried about damaging the cars 1923 rear axel, also, I only intend to use her for sprints and hill climbs, so may never get the opportunity to really stretch her legs. 

She is very much a racing car and will not be used on the road.

Regards, Mark.

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Hi Mark, excellent pictures, thank you! How did you make the pop off valve on the end of the inlet manifold?

Simon

Have you made any mods to ensure the block stays attached to the crankcase?

Hi Simon,

The 'pop off' is actually just the outlet to the cars boost gauge and the block has a couple of extra bolts to keep things together.

Regards, Mark.

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Fantastic project and a beautiful looking engine! Willing to share it's spec? John

Hi John,

The Supercharger is a roots with straight cut 3 lobe rotors and has a swept volume of 33.46 cu.in. giving 60 cu.in. of air at 5 lbs/sq.in. at 5000rpm, which is exactly the same as the reported output of the original.

The engine uses a 1 1/2" Phoenix crankshaft, Pigsty supercharger cam, forged pistons and rods, ball race main bearings and has gas flowed ports, Ricardo head and a bespoke water pump made to fit under the 1 1/2" bronze body S.U. float chamber and choke.

She should have a 30mm Cox Atmos carb, which felt like a big unknown to deal with. I do have one, but, as the Supercharger was an even bigger unknown, it was decided to get that working with the S.U. then, if it worked, to see if the Cox could be made to work with it. So I will only fit once I know everything else works.

The BLIC Magneto is an issue, after getting the unit back from the restorer, it proved to be wrongly timed and be low on flux, I sent it back for him to fix, but it remains mostly useless, so subsequent dyno runs to setup the carb used a borrowed unit.

Regards, Mark.