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Author Topic: CR (Check my math)  (Read 4258 times)
louisb
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« 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

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Lids
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« 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
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« 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
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« 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

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j-f
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« 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
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« 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
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« 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 » Logged
Louis Brooks

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alex d
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« Reply #7 on: July 26, 2007, 10:38:15 am »
check the shim thickness with a micrometer, you never know  Roll Eyes
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The Ideaman
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« 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
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« 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 » Logged
Louis Brooks

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The Ideaman
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« 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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