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1/4 Scale Replica Engines #48124
07/07/06 3:57 pm
07/07/06 3:57 pm
Joined: Oct 2003
Posts: 11,212
North Georgia, USA
RF Whatley Offline OP
BritBike Forum member
RF Whatley  Offline OP
BritBike Forum member
Joined: Oct 2003
Posts: 11,212
North Georgia, USA
A little off the subject, but here's a company that builds 1/4 scale engines that actually run! Among their creations is a Harley knuckle head.

Check it out...
http://www.replicaengines.com/


Can a replica Gold Star small enough to ride in the house be far off?


bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
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Re: 1/4 Scale Replica Engines #48125
07/07/06 6:00 pm
07/07/06 6:00 pm
Joined: Sep 2002
Posts: 7,813
Seattle
Alex Offline

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Alex  Offline

BritBike Forum member
Joined: Sep 2002
Posts: 7,813
Seattle
Puzzling. Truly puzzling...


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: 1/4 Scale Replica Engines #48126
07/07/06 8:22 pm
07/07/06 8:22 pm
Joined: Sep 2001
Posts: 272
Eugene, OR
Carlo Offline
BritBike Forum member
Carlo  Offline
BritBike Forum member
Joined: Sep 2001
Posts: 272
Eugene, OR
Been a fan of that sort of thing for yea...very september.
My website features pictures and sounds of some of the engines.
Check out this 1/2 scale Manx engine. Th...nnsport engine.

Be sure and check out the Radial engine too. That's the most authentic looking model engine I've ever seen. It's correct in every detail down to the spec plate on the crankcase. I should know, there are two of those engines on stands where I work, and I compared that picture to the real thing. The only flaw in the detailing was that the full size one has two more cooling fins between the rocker boxes than the original; Paul Knapp, the builder said they just couldn't make casting patterns with that many fins in that location.
These engines do run, and they've built 1/4 scale radio control airplanes that actually fly.

Re: 1/4 Scale Replica Engines #48127
07/07/06 8:45 pm
07/07/06 8:45 pm
Joined: Sep 2001
Posts: 272
Eugene, OR
Carlo Offline
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Carlo  Offline
BritBike Forum member
Joined: Sep 2001
Posts: 272
Eugene, OR

Re: 1/4 Scale Replica Engines #48128
07/07/06 8:50 pm
07/07/06 8:50 pm
Joined: Sep 2001
Posts: 272
Eugene, OR
Carlo Offline
BritBike Forum member
Carlo  Offline
BritBike Forum member
Joined: Sep 2001
Posts: 272
Eugene, OR
Here ya go, 1/2 scale Norton Manx:


Re: 1/4 Scale Replica Engines #48129
07/07/06 8:50 pm
07/07/06 8:50 pm
Joined: Feb 2006
Posts: 307
Saint John, New Brunswick
BSACafe Offline
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BSACafe  Offline
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Posts: 307
Saint John, New Brunswick
They are very cool indeed, but I gotta say that these people muse have a lot of spare time on their hands.


Jer

http://www.caferacer.ca

1968 BSA Lightning Cafe
1968 BSA Thunderbolt
1969 BSA Royal Star
1972 BSA Thunderbolt
Re: 1/4 Scale Replica Engines #48130
07/08/06 7:02 am
07/08/06 7:02 am
Joined: Oct 2004
Posts: 4,429
Melbourne Australia
Tiger Offline
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Tiger  Offline
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Joined: Oct 2004
Posts: 4,429
Melbourne Australia
I want the Offenhauser, they were a great engine.


1969 TR6R
7.62 x 51 is not a maths puzzle.
Re: 1/4 Scale Replica Engines #48131
07/08/06 11:46 am
07/08/06 11:46 am
Joined: Aug 2001
Posts: 5,074
Stone Creek OH USA
R
Rich B Offline

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Rich B  Offline

BritBike Forum member
R
Joined: Aug 2001
Posts: 5,074
Stone Creek OH USA
The little Gnome radial is cool. Such an illogical engine. laugh

I agree the Offenhauser is neat also....for a car engine, they fascinate me. And if you have ever heard a real one running....awesome sound.

Of course, their building of a Curtis OX5 is somewhat strange.....they weren't a very good engine in full size.....hopefully they were improved in scale....


Life is too short to drink cheap, bad beer.
Re: 1/4 Scale Replica Engines #48132
07/13/06 12:12 am
07/13/06 12:12 am
Joined: Oct 2003
Posts: 11,212
North Georgia, USA
RF Whatley Offline OP
BritBike Forum member
RF Whatley  Offline OP
BritBike Forum member
Joined: Oct 2003
Posts: 11,212
North Georgia, USA
A lot of you have asked....

so here's the original article in this month's Machine Design magazine that got me looking at this subject....
Much better photos than the company's web page.

http://www.machinedesign.com/ASP/viewSel...SUE&CatID=3

bigt


Don't hide 'em, Ride 'em !!

RF Whatley
Cornelia, GA

"Shop Boy" at Rodi British Bikes
Re: 1/4 Scale Replica Engines #48133
07/13/06 12:43 am
07/13/06 12:43 am
Joined: Sep 2004
Posts: 269
E
EWebster Offline
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EWebster  Offline
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E
Joined: Sep 2004
Posts: 269
Quote:
Of course, their building of a Curtis OX5 is somewhat strange.....they weren't a very good engine in full size.....hopefully they were improved in scale....
Curtis OX-5 history

Re: 1/4 Scale Replica Engines #48134
07/18/06 3:57 pm
07/18/06 3:57 pm
Joined: Feb 2006
Posts: 1,097
Toronto, Ontario, Canada
Matthew in TO Offline
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Matthew in TO  Offline
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Joined: Feb 2006
Posts: 1,097
Toronto, Ontario, Canada
Would the mini Aurora V-8 fit nicely into a motorcycle frame? Would this engine actually run without melting at high RPM? What sort of gearbox could be fitted? There's no mention of horsepower, but I imagine well over 100 hp should be possible. http://www.replicaengines.com/products/aurora.htm

Motorcycle Classics magazine (a great mag, unlike those UK classic bike ads that seem to be becoming large buy/sell pages) did a nice article on Morbidelli's 850 V8 motorcycle, which got me thinking of the mini Aurora V-8 for a bike motor.


1970 Triumph T100S (1969 T100S motor)
Re: 1/4 Scale Replica Engines #48135
07/19/06 12:29 pm
07/19/06 12:29 pm

A
Anonymous
Unregistered
Anonymous
Unregistered
A


"Would the mini Aurora V-8 fit nicely into a motorcycle frame? Would this engine actually run without melting at high RPM? What sort of gearbox could be fitted? There's no mention of horsepower, but I imagine well over 100 hp should be possible."
???
It's 3.8". 15 hp might be possible at 20,000 RPM.

Re: 1/4 Scale Replica Engines #48136
07/19/06 12:57 pm
07/19/06 12:57 pm
Joined: Feb 2006
Posts: 1,097
Toronto, Ontario, Canada
Matthew in TO Offline
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Matthew in TO  Offline
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Joined: Feb 2006
Posts: 1,097
Toronto, Ontario, Canada
3.5"? Are you referring to the dimensions?

I thought it was a 1/4 size replica. The website shows a displacement of 3.8 C1. I assume this means cublic inches. 1 cubic inches = 16.387064 cubic centimeters, so that's a displacement of 62.2cc.

I agree at this displacement we'd have a pretty weak motorcycle engine. However this can't be right. If the scale is 1/4, this would mean the full size race car engine was only 250cc.

Something is amiss here. The IRL Aurora V8 is based on the production 4.0-liter DOHC 32-valve Aurora V8. The production Aurora V8 engine produces 250 horsepower at 5,600 rpm on unleaded gasoline; the methanol-burning IRL Aurora V8 racing engine produces over 700 horsepower and revs to 10,500 rpm.

Thus, if this is a true 1/4 scale replica, the new motor should be a quarter of the 4.0 L displacement (i.e. 1,000cc), and should generate a quarter of the horsepower, 250hp on gasoline = 62.5hp at 1/4 scale or 700 hp on methanol = 175hp at 1/4 scale.

Assuming my numbers are right, I am surprised how weak a 1,000cc version of this motor would be. 62.5hp on 1,000cc? A 1995 Triumph Trident 885cc obtains more hp than that.


1970 Triumph T100S (1969 T100S motor)
Re: 1/4 Scale Replica Engines #48137
07/19/06 4:30 pm
07/19/06 4:30 pm

A
Anonymous
Unregistered
Anonymous
Unregistered
A


1/4-scale means every dimension is reduced to 25%, which reduces the displacement to 6.25% (1/4^3 = 1/64).
Bore shown of .915" = 3.66", etc.
Original displacement was 243" 3988cc.

Re: 1/4 Scale Replica Engines #48138
07/19/06 4:55 pm
07/19/06 4:55 pm
Joined: Sep 2002
Posts: 7,813
Seattle
Alex Offline

BritBike Forum member
Alex  Offline

BritBike Forum member
Joined: Sep 2002
Posts: 7,813
Seattle
Those replicas are all strictly small-time. This is hardcore.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: 1/4 Scale Replica Engines #48139
07/20/06 8:43 pm
07/20/06 8:43 pm
Joined: Sep 2001
Posts: 272
Eugene, OR
Carlo Offline
BritBike Forum member
Carlo  Offline
BritBike Forum member
Joined: Sep 2001
Posts: 272
Eugene, OR
Quote:
Originally posted by Alex:
Those replicas are all strictly small-time. This is hardcore.
I've had pictures of that guy and his engine on my website for at least 6 years. Apparetnly nobody followed the link I put up there.
That's an 18 cylinder two stroke engine with 36 pistons sharing common combustion chambers between the opposed sets of pistons. I spoke with the builder several times over the years, as he displayed it at the Pacific Rim Model Engineer's Show here in Oregon.
Everything on that engine was machined from billet.
It's called a "deltic" engine, because it has 3 crankshafts arranged in a triangle.
Clen told me his engine isn't really a "replica" he designed it himself based on the deltic concept. If it was a replica, it would be 1/10th scale or smaller of one of those really big marine or locomotive engines.
BTW, it looks like the picture on the site you linked to was taken at the same show I took my pictures at.


Re: 1/4 Scale Replica Engines #48140
07/20/06 8:54 pm
07/20/06 8:54 pm
Joined: Sep 2001
Posts: 272
Eugene, OR
Carlo Offline
BritBike Forum member
Carlo  Offline
BritBike Forum member
Joined: Sep 2001
Posts: 272
Eugene, OR
Here's another Englishman with too much time on his hands. A 1/4 scale Merlin engine. Running.

Re: 1/4 Scale Replica Engines #48141
07/21/06 9:36 am
07/21/06 9:36 am
Joined: Oct 2004
Posts: 4,429
Melbourne Australia
Tiger Offline
BritBike Forum member
Tiger  Offline
BritBike Forum member
Joined: Oct 2004
Posts: 4,429
Melbourne Australia
That Deltic is the most odd thing I have ever seen [and I was in Sydney last week laugh ]

Napier also built the Sabre aero engine for installation in the Hawker Typhoon, back in the early '40's.
A grim joke was that if you wanted to own a Typhoon buy a paddock, [in the UK] one was bound to emergency land on it !

The Brits lost a lot of pilots until they found a piece of liver, analysed it, and found the unfortunate airman was full of carbon monoxide, the solution was to continue operations with the pilot on oxygen whenever the engine was running.

I believe that BRM revived the H16 concept for an F1 car back in '63 or therabouts.


1969 TR6R
7.62 x 51 is not a maths puzzle.

Moderated by  Alan_nc 


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