Alan B
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| posted on 2/5/13 at 06:05 PM |
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Yes, we do post about small engines.....
But this guy seems to have made a great, fun business out of it...
linky
Great stuff and a good read too....
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40inches
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| posted on 2/5/13 at 07:35 PM |
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That supercharged 100cc V8 is.....well, it just is 
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puma931
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| posted on 2/5/13 at 08:23 PM |
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so cool
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rf900rush
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| posted on 2/5/13 at 09:39 PM |
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Posted this on a while ago
http://www.locostbuilders.co.uk/viewthread.php?tid=178875
[Edited on 2/5/13 by rf900rush]
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clairetoo
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| posted on 2/5/13 at 09:40 PM |
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I'm confused - if its quarter scale , shouldnt it be closer to 2 litre , after all , how many 400 cc V8's are there ?
Just sayin'....................
Its cuz I is blond , innit
Claire xx
Will weld for food......
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Alan B
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| posted on 2/5/13 at 09:48 PM |
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quote:
Originally posted by clairetoo
I'm confused - if its quarter scale , shouldnt it be closer to 2 litre , after all , how many 400 cc V8's are there ?
Just sayin'....................
1/4 linear scale....equates to 1/4 x 1/4 x 1/4 volumetrically.....or 1/64......approx 6.4 litres
rf900rush....that was really the meaning of my title......yes, we've seen stuff like this before...didn't realise you'd posted the
exact thing though....my apologies to those who have seen it before..
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Ninehigh
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| posted on 3/5/13 at 07:12 AM |
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I wonder what ratio the power goes down, 1/4 or 1/64?
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hughpinder
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| posted on 3/5/13 at 07:56 AM |
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It says the supercharged engine makes 9hp - so pretty good power to weight ratio for a model engine .
Hugh
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Fred W B
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| posted on 3/5/13 at 11:19 AM |
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quote:
I wonder what ratio the power goes down, 1/4 or 1/64?
An equation for HP = PLANK where
P= bmep (combusion pressure)
L= length of stroke
A= piston area
N = revs per minute
K = a constant
so it will be the smaller one
Cheers
Fred W B
You can do it quickly. You can do it cheap. You can do it right. – Pick any two.
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Alan B
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| posted on 3/5/13 at 11:27 AM |
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quote:
Originally posted by Fred W B
quote:
I wonder what ratio the power goes down, 1/4 or 1/64?
An equation for HP = PLANK where
P= bmep (combusion pressure)
L= length of stroke
A= piston area
N = revs per minute
K = a constant
so it will be the smaller one
Cheers
Fred W B
Yes indeed.
Along with weight and volume the power will be scaled by the linear scale cubed.......ie: 1/64
So at 5hp x 64 = 320hp.....which is about what you'd expect from a low tech (no offence) 6.4 litre V8......IOW around 50hp/litre.
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