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Tractor Talk Discussion Forum

What engine would you like to see made?

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NC Wayne

07-03-2006 22:05:11




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Hey guys, I just read an article about this outfit and checked out their website. They take full sized engines and reverse engineer them down to a 1/4 scale. The final product is a running engine. I reas the article in the print magazine but I believe you can read the same article online at--- machinedesign.com---- It tells what all they put into downsizing and making these jewels. If you can't read the article great, if not you can still check out their site where you can see the finished products. I don't see any pricing anywhere but judging by what the article was saying their "quite proud" of them and I can understand why. Supposidly their next offering is gonna be a V12 Rolls-Royce Merlin engine like ran in the P51 Mustangs. This leads to my question. If you had your choice what engine would you like to see them to make?? First choice, for me would be a two cylinder Deere engine. Second and third choice in no particular order would be either a Detroit or a Murphy. I know the last two are diesels and they'd have to put an ignition system on them because the models run on methanol, but it'd still be neat to see even if it wasn't 100% "authentic".

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dr.sportster

07-04-2006 10:49:40




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 Re: What engine would you like to see made? in reply to NC Wayne, 07-03-2006 22:05:11  
I was sent to that site off a bike site once before.Pretty cool stuff.Id like to see half scale so you could use them in bikes.Anything Id say like flathead Ford or Harley they already have made.Theres another site where they are not for sale,ones guys made for themselves.Takes lots of machining skills and some God given talent also.Nice to see.



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mjbrown

07-04-2006 06:44:35




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 Re: What engine would you like to see made? in reply to NC Wayne, 07-03-2006 22:05:11  
A quarter scale Merlin. Full scale is 1650 cubic inches more or less. Quarter scale around 400c.i. That would be very cool! Just think of the toys you could put that in.



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N

07-04-2006 12:56:12




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 Re: What engine would you like to see made? in reply to mjbrown, 07-04-2006 06:44:35  
The linear dimensions are 1/4, not the volume. The volume would be 1/4 cubed, or 1/64. Take a 1/4 scale 454 chevy for example. It would have a bore of 1.0625 and a stroke of 1. Thus, it would displace:

8*((1.0625/2)^2)*1 = 7.09 cubic inches

The 1/4 scale merlin would displace around 26 cubic inches.



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mjbrown

07-04-2006 15:01:20




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 Re: What engine would you like to see made? in reply to N, 07-04-2006 12:56:12  
Wouldn't the 454 scale with a 1" bore and 1"stroke displace 26.56 c.i.? (1"x3.14 x1")8
The merlin has in round numbers a 6x6 bore and stroke. If linear dimensions are reduced 75% would the linear distance across the cylinders be 1.5"? If so and stroke is now 1.5" then (1.5x3.14x1.5)12 is roughly 85c.i.
I could be wrong.



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N

07-04-2006 15:41:55




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 Re: What engine would you like to see made? in reply to mjbrown, 07-04-2006 15:01:20  
You're close. The correct equation for the displacement of each cylinder is -

pi*r^2*stroke

Where r is the radius, or 1/2 of the bore. The equation you were using would tell you the area of the cylinder swept by each piston. I forgot to show pi in my earlier equation, but the answer was right (I cheated and didn't actually work out the numbers). For the 1/4 scale merlin, with a bore of 1.5 and a stroke of 1.5, each cylinder would displace -

3.14*(.75^2)*1.5 = 2.65 cubic inches

So, the 1/4 scale merlin would displace 31.8 cubic inches if the full-size merlin had a 6X6 bore and stroke.

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mjbrown

07-04-2006 16:00:27




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 Re: What engine would you like to see made? in reply to N, 07-04-2006 15:41:55  
Correct. piDis circumference. Been out of school a long time.



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720Deere

07-04-2006 04:09:29




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 Re: What engine would you like to see made? in reply to NC Wayne, 07-03-2006 22:05:11  
It looks like for around $10,000 you can own the Olds Aurora IRL replica complete with running stand. Now, if I only had a 1/4 scale Indy car!



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