The Cal-look Lounge
Welcome, Guest. Please login or register.
Did you miss your activation email?
September 19, 2024, 01:00:36 am

Login with username, password and session length
Thank you for your support!
Search:     Advanced search
351055 Posts in 28638 Topics by 6845 Members
Latest Member: DonA
* Home This Year's European Top 20 lists All Time European Top 20 lists Search Login Register
+  The Cal-look Lounge
|-+  Cal-look/High Performance
| |-+  Cal-look
| | |-+  CR (Check my math)		 « previous next »
Pages: [1] Print
Author Topic: CR (Check my math)  (Read 3580 times)
louisb
Hero Member
*****
Posts: 3274


Runs with Scissors
« 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
Logged
Louis Brooks

The Beatings Will Continue Until Moral Improves!
Lids
Hero Member
*****
Posts: 3527


show me the chedder


WWW
« 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
Logged
If there's enough horse shit around, there must be a pony!
Buy your ciderberry here.

http://www.thatcherscider.co.uk/
j-f
Hero Member
*****
Posts: 1598


Jean-François


WWW
« 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.



Logged
louisb
Hero Member
*****
Posts: 3274


Runs with Scissors
« 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
Logged
Louis Brooks

The Beatings Will Continue Until Moral Improves!
j-f
Hero Member
*****
Posts: 1598


Jean-François


WWW
« 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 ?
Logged
The Ideaman
Hero Member
*****
Posts: 625
« 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
Logged
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
« 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

The Beatings Will Continue Until Moral Improves!
alex d
Hero Member
*****
Posts: 1033
« Reply #7 on: July 26, 2007, 10:38:15 am »
check the shim thickness with a micrometer, you never know  Roll Eyes
Logged
The Ideaman
Hero Member
*****
Posts: 625
« Reply #8 on: July 27, 2007, 01:30:08 am »
41cc's with .060 inch deck gets you 12 to 1.
Logged
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
« 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

The Beatings Will Continue Until Moral Improves!
The Ideaman
Hero Member
*****
Posts: 625
« 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.
Logged
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.
Pages: [1] Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!