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CR (Check my math)
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Topic: CR (Check my math) (Read 4258 times)
louisb
Hero Member
Posts: 3274
Runs with Scissors
CR (Check my math)
«
on:
July 25, 2007, 17:09:29 pm »
Someone check my math please and let me know if I am doing this right.
Bore - 94
Stroke - 82
# Cyl - 4
Deck Height - .06 (copper gasket)
Head Volume - 51cc (What is the volume on a stock VW head?)
Compression ratio - 12.07:1 (And yes I know that is high)
Thanks,
--louis
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Louis Brooks
The Beatings Will Continue Until Moral Improves!
Lids
Hero Member
Posts: 3527
show me the chedder
Re: CR (Check my math)
«
Reply #1 on:
July 25, 2007, 17:19:53 pm »
thats what i make it.
use attached file to see, rename from txt to xls, as it is actually a MS Excel file
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j-f
Hero Member
Posts: 1611
Jean-François
Re: CR (Check my math)
«
Reply #2 on:
July 25, 2007, 17:24:53 pm »
I use a calculator on the net. Check
flat4ever.com
With your indication and translating the .06 (I suppose Pounds) in millimeter = 1.62mm the result is 10.14 cr.
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louisb
Hero Member
Posts: 3274
Runs with Scissors
Re: CR (Check my math)
«
Reply #3 on:
July 25, 2007, 17:35:58 pm »
Quote from: lids_2001 on July 25, 2007, 17:19:53 pm
thats what i make it.
use attached file to see, rename from txt to xls, as it is actually a MS Excel file
Okay thanks for the work sheet.
Quote from: j-f on July 25, 2007, 17:24:53 pm
I use a calculator on the net. Check
flat4ever.com
With your indication and translating the .06 (I suppose Pounds) in millimeter = 1.62mm the result is 10.14 cr.
The copper gasket is .06mm. Sorry i should have been more specific.
Thanks,
--louis
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Louis Brooks
The Beatings Will Continue Until Moral Improves!
j-f
Hero Member
Posts: 1611
Jean-François
Re: CR (Check my math)
«
Reply #4 on:
July 25, 2007, 17:57:36 pm »
I find 12.07 cr also with this calculator.
I don't know very much in mechanics,but 0.06 for the deck height is not a too small ?
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The Ideaman
Hero Member
Posts: 625
Re: CR (Check my math)
«
Reply #5 on:
July 25, 2007, 18:01:01 pm »
Aren't the copper gaskets .060 inch? If so, then the compression ratio is 10.2 to 1.
http://www.cbperformance.com/enginecalc.html
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It is the soldier,
Who salutes the flag,
Who serves beneath the flag,
And whose coffin is draped in the flag,
Who allows the protestor to burn the flag.
louisb
Hero Member
Posts: 3274
Runs with Scissors
Re: CR (Check my math)
«
Reply #6 on:
July 25, 2007, 19:38:30 pm »
Humm, maybe it is inches. That would make more sense. I was surprised to get such a high ratio with that large of a head volume and a .06 deck. so to get close to 12:1 I would need something like a .04 deck and a 45cc head. Sounds pretty tight.
Thanks,
--louis
«
Last Edit: July 25, 2007, 19:40:56 pm by louisb
»
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Louis Brooks
The Beatings Will Continue Until Moral Improves!
alex d
Hero Member
Posts: 1035
Re: CR (Check my math)
«
Reply #7 on:
July 26, 2007, 10:38:15 am »
check the shim thickness with a micrometer, you never know
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The Ideaman
Hero Member
Posts: 625
Re: CR (Check my math)
«
Reply #8 on:
July 27, 2007, 01:30:08 am »
41cc's with .060 inch deck gets you 12 to 1.
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It is the soldier,
Who salutes the flag,
Who serves beneath the flag,
And whose coffin is draped in the flag,
Who allows the protestor to burn the flag.
louisb
Hero Member
Posts: 3274
Runs with Scissors
Re: CR (Check my math)
«
Reply #9 on:
July 27, 2007, 01:46:00 am »
Wonder if you can get a VW casting down that much.
edit: actually with a 5 cc dome that puts me a 46cc which isn't too bad.
--louis
«
Last Edit: July 27, 2007, 01:47:47 am by louisb
»
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Louis Brooks
The Beatings Will Continue Until Moral Improves!
The Ideaman
Hero Member
Posts: 625
Re: CR (Check my math)
«
Reply #10 on:
July 27, 2007, 03:32:35 am »
I had a set of VW castings with 28cc's in 'em. Made for a 13 to 1 1776.
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It is the soldier,
Who salutes the flag,
Who serves beneath the flag,
And whose coffin is draped in the flag,
Who allows the protestor to burn the flag.
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