Manky Monkey Motors

Technical Section => Bike Tech => Topic started by: Tony oily bike on May 04, 2019, 01:04:05 PM



Title: “Lock Stock” – a Royal Enfield special
Post by: Tony oily bike on May 04, 2019, 01:04:05 PM
A friend pointed me in the direction of this – “Lock Stock” – a Royal Enfield special, which was unveiled at London’s Bike Shed Show in May 2018.

The following two sites give details for those interested.
https://thebikeshed.cc/royal-enfield-lock-stock/
https://amcn.com.au/editorial/royal-enfield-lock-stock-2/

Whilst Royal Enfields are far from the most common machine to be seen in the straight-line world of motorcycle sport, a couple of (realativly recent) shots of a rather tidy blown (supercharged) Royal Enfield Constellation (prob from about 1958 - 1963) can be seen in this thread, in period trim with spoked wheels and 4” Racemaster slick.


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Tony oily bike on May 04, 2019, 01:04:40 PM
The LHS


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Tony oily bike on May 04, 2019, 01:05:13 PM
With rider


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Tony oily bike on May 04, 2019, 01:07:09 PM
Period / nostalgia supercharged Royal Enfield Constellation, in period trim with spoked wheels and 4” Racemaster slick.


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Tony oily bike on May 04, 2019, 01:08:08 PM
Period / nostalgia supercharged Royal Enfield Constellation, in period trim with spoked wheels and 4” Racemaster slick, getting the engine running using rollers.


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Manky Monkey on May 04, 2019, 02:26:49 PM
I like the vintage sprinter.
I didn't think modern Enfield's had enough oomph for serious racing, although it looks like that one's running Nitrous too.


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: stinkey on May 05, 2019, 07:13:15 AM
Definitely prefer the old one 8)


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Tony oily bike on May 07, 2019, 07:47:16 AM
I like the vintage sprinter.
I didn't think modern Enfield's had enough oomph for serious racing, although it looks like that one's running Nitrous too.

The engine has been tweaked a tad as one of the websites tells us...........

Starting out with the stock 648cc motor which delivered a claimed 47hp at the crank at 7100rpm, and 52Nm of torque at 4000 revs, S&S bored out and presumably also stroked the Royal Enfield engine to measure 865cc – oh, hello Triumph! – without any modification to the crankcases or cylinders, although the exact dimensions are secret.

Improvements include a high-performance camshaft, plus forged conrods on the stock but stroked forged crank, which carry high-compression forged pistons. These deliver a much higher 12.4:1 compression ratio in conjunction with a CNC-ported cylinder head, which now requires an oil cooler to cope with the increase in performance. The multipoint sequential EFI now features S&S’s own ECU, matched to larger 38mm throttle bodies and a high-flow injector kit. The racing exhaust features slash-cut custom headers, with straight-through pipes and no silencer.

All the pinions in the stock six-speed gearbox have been undercut, and are matched to a high-performance clutch kit and a quickshifter system controlled by two buttons mounted on the left handlebar. The nitrous is programmed to kick in at 4000rpm, and the engine redlines at 8500rpm, with a soft limiter one hundred revs lower.
“Over 100hp” at the rear wheel at 7040 rpm is all that S&S or Enfield will admit to with Stage 1 nitrous, but they’re quite specific about the torque: 113.61Nm at 5840rpm. Impressive!


They say it has basically double the power and double the torque of a stock engine.


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Manky Monkey on May 07, 2019, 01:06:10 PM
I always thought Enfields were steady old plodders. Didn't realise you could get that much power out of them.


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Tony oily bike on May 08, 2019, 06:39:14 AM
I always thought Enfields were steady old plodders. Didn't realise you could get that much power out of them.

Ahhhhhhhhhhhhh, but Lock Stock is a modified new Royal Enfield.

RE launched the new road-going Continental GT 650 and Interceptor 650 in (I think) 2018, powered by a parallel twin 650cc, OHC, 270 degree crank, 4 valve head, fuel injection, electric start (no kick), mated to a 6 speed box.
On the road price in the UK is around the Ł5,500 mark for the Interceptor, and a couple of hundred more for the GT.

Pics of the new RE twins


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Tony oily bike on May 08, 2019, 06:39:58 AM
Continental GT


RE website for pics, videos & prices
https://www.royalenfield-uk.co.uk/index


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Manky Monkey on May 08, 2019, 08:20:28 AM
I like that orange roadster, (reminds me of the UK spec XS650). Very nice.


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: the coppersmith on May 08, 2019, 11:25:51 AM
I had an original Continental GT, 250, lovely red. From brand new it leaked oil. In the end after a year of arging, I got a brand new one in exchange, 3 monthes down the road it started doing the same. Quick gunking and swapped it in for a lovely oil tight Honda. Seems Enfield were reknown for the leaks 


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Tony oily bike on May 08, 2019, 11:53:49 AM
I had an original Continental GT, 250, lovely red. From brand new it leaked oil. In the end after a year of arging, I got a brand new one in exchange, 3 monthes down the road it started doing the same. Quick gunking and swapped it in for a lovely oil tight Honda. Seems Enfield were reknown for the leaks 

mmmm, R"oil" Enfield  :D


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Olds on May 08, 2019, 12:42:39 PM
I had an original Continental GT, 250, lovely red. From brand new it leaked oil. In the end after a year of arging, I got a brand new one in exchange, 3 monthes down the road it started doing the same. Quick gunking and swapped it in for a lovely oil tight Honda. Seems Enfield were reknown for the leaks 
mmmm, R"oil" Enfield  :D
We knew them as Royal Oilfield.  :)
Not if you build them right.  My 500 Bullet was oil tight after I lapped all the mating faces with valve grinding paste. Damned slow, tedious job and had to be really careful about cleaning afterwards.


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Manky Monkey on May 08, 2019, 09:35:49 PM
I remember Malcolm doing that in an old Ogri cartoon. Ogri flatted his casing on a sheet of glass. Malcolm used glass from a bathroom window -with a raised pattern on it :)


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Tony oily bike on May 10, 2019, 07:11:50 AM
I remember Malcolm doing that in an old Ogri cartoon. Ogri flatted his casing on a sheet of glass. Malcolm used glass from a bathroom window -with a raised pattern on it :)

In Bike magazine's Ogri cartoon strip, Paul Sample hardly ever drew the frame of a motorcycle.
Apparently one of his trade marks.
 ;)


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Manky Monkey on May 10, 2019, 08:25:52 AM
I never noticed that.


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: BikerGran on May 28, 2019, 07:56:29 PM
I had an original Continental GT, 250, lovely red. From brand new it leaked oil. In the end after a year of arging, I got a brand new one in exchange, 3 monthes down the road it started doing the same. Quick gunking and swapped it in for a lovely oil tight Honda. Seems Enfield were reknown for the leaks 

Wouldn't be a proper Brit if it didn't leak oil!

 ;D ;D


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: morrag on June 10, 2019, 10:34:33 PM
Royal Enfield! that's where the Queen keeps her chickens I believe!.... :o :o..yeah, got me coat, and on my way.................


Title: Re: “Lock Stock” – a Royal Enfield special
Post by: Manky Monkey on June 10, 2019, 11:09:22 PM
 :P