Nothing new... - arnold2
What with the latest petrol engines with direct injection, seems nothing is really new...

Rolls-Royce Crecy - 2-stroke 90 degree V12 26L liquid cooled, direct petrol injection, stratified charge injection, variable blade superchargers .... Crecy number 10 achieved 2500 hp on 21 December 1944. Subsequently single cylinder tests achieved the equivalent of 5000 bhp for the complete engine ... that's 190 BHP/Litre !

That'll do in my Skoda !
Nothing new... - Altea Ego
But they were not expected to do 200,000 hours between rebuilds
TourVanMan TM < Ex RF >
Nothing new... - IanJohnson
And for its size it probably did not generate a great deal of torque, not that you'd notice in a Skoda although you might have difficulty getting enough flow through the radiator to keep it cool in town!
Nothing new... - SteVee
interesting engine - so thanks for the post.
I'd always wondered why the forced-induction 2-stroke valved engine wasn't around.

Japanese racing 2-stroke motorcycle engines were achieving 350-400 BHP / litre - without forced induction, but this was with small displacements.

I did like the following comment about the RR Crecy:
"The thrust produced by the 2-stroke exhaust was estimated as being equivalent to 30% of the power of the engine, and was exceptionally loud." :-)
Nothing new... - rover 75
Does anyone know what happened with the 2-stroke engines Ford and Jaguar were testing in the 90's ? I seem to remember an Australian connection.The R.R. Crecy was installed in a Fairey Battle "hack" aircraft during the war and gave trouble free service for some years.
Nothing new... - cheddar
The Crecy was designed by Harry Ricardo who's name is still used by the famed automotive consulting company Ricardo Engineering.
Nothing new... - DP
I think it was the increased focus on emissions that wiped out the two stroke resurgence. It's happened in bikes as well - you can no longer buy a 2 stroke motorcycle bigger than 125cc, and even many of these are under threat when the new Euro III laws start to bite.

I remember a 2 stroke Fiesta appearing in Autocar in the 90's with a 1.2 litre 2-stroke triple. The Australia connection is correct - the engines were co-developed with the Orbital engine company.

The road test was very positive. Apart from a "gutteral" sound under load, they found it very hard to criticise. Comprehensively outperformed the XR2i of the time as well, despite it's 1.2 litre capacity.

Nothing new... - rover 75
The case for 2-strokes initially seems compelling being virtually maintenance free,lightweight, no oil changes just a set of plugs every 30k.Was it politics or a genuine inability to solve the emissions problem ? Something for the oldies,does anyone remember those Dodge trucks with 6cyl horizontally opposed 2-stroke diesel engines mounted foward of the front axel and the wonderful noise they made uphill ?
Nothing new... - Gromit {P}
The case for 2-strokes initially seems compelling ... was it politics or a genuine inability to solve the emissions problem ?

I gather emissions (particularly the EPA regulations in California) that are the problem - there's a determined push on to promote use of 4-strokes in all but the smallest (under 5hp) outboard boat engines too.
Nothing new... - JH
don't even exclude "the smallest". Honda put 4 strokes in their strimmers.
Nothing new... - fordprefect
rover 75, I think you are referring to the Commer TS3 line of trucks, a significant part of the noise was probably from the Roots scavenge blower. (3 cylinders, 6 pistons?)
Nothing new... - rover 75
Yes I could'nt remember whether they were Commer or Dodge but I do recall that "bark"!
Nothing new... - fordprefect
Around the same period as the TS3 Commers (or maybe a few years later) there were Fodens with the FD VII turbocharged in-line 6 two-stroke diesel which also had a very distinctive sound, anyone remember those?
Nothing new... - bell boy
detroit weasel by any perchance? starting backwards occasionally if not careful

Ask Honest John

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