tiplickhahaha
Hummmmmmmmm
- Location
- Indianapolis, IN
anyone care to explain compression ratio?
cant rember the formula to work cc size
- Thread starter w-nut
- Start date
douglee25
m3booooy
- Location
- South Jersey
(Cylinder volume + Combustion chamber volume) / (Combustion Chamber Volume)
Cylinder Volume = Pi*((bore/2)^2)*stroke
Combustion Chamber Volume = Head volume + Head Gasket Volume + Deck to piston volume + Crown Volume. Crown volume can be plus or minus depending on if it's a dished piston or a domed piston. If it's dished, you add the volume into the total equation. If the piston is domed, you subtract the total volume.
Head volume = #cc's (33, 35, etc)
Deck to piston volume = Pi*((bore/2)^2)*(Deck Height - (stroke+centerline of piston pin to top of piston (only count major flat portion)))
Head gasket volume = Pi*((head gasket diameter (measure it!)/2)^2)*Thickness of gasket
Watch your units!!
Doug
Cylinder Volume = Pi*((bore/2)^2)*stroke
Combustion Chamber Volume = Head volume + Head Gasket Volume + Deck to piston volume + Crown Volume. Crown volume can be plus or minus depending on if it's a dished piston or a domed piston. If it's dished, you add the volume into the total equation. If the piston is domed, you subtract the total volume.
Head volume = #cc's (33, 35, etc)
Deck to piston volume = Pi*((bore/2)^2)*(Deck Height - (stroke+centerline of piston pin to top of piston (only count major flat portion)))
Head gasket volume = Pi*((head gasket diameter (measure it!)/2)^2)*Thickness of gasket
Watch your units!!
Doug
CoreyLKN
LKN Freestyle Militia
- Location
- Lake norman, nc
Last edited:
550 SLUT
BORN TO FISH NOT CATCH
- Location
- PETALUMA, CALI
C ratio
compression ratio is the numeric ratio between the combined volume of a cylinder and combustion chamber when the piston is at BDC (bottom dead center) and the volume when the piston is at TDC (top dead center)
so when the piston is at the bottom of the cylinder it is the volume of the cylinder and combustion chamber in the head, vs when piston is at top dead center is is just a little of the cylinder plus the combustion chamber in the head
compression ratio is the numeric ratio between the combined volume of a cylinder and combustion chamber when the piston is at BDC (bottom dead center) and the volume when the piston is at TDC (top dead center)
so when the piston is at the bottom of the cylinder it is the volume of the cylinder and combustion chamber in the head, vs when piston is at top dead center is is just a little of the cylinder plus the combustion chamber in the head
romack991
homebrewed
- Location
- Warsaw, IN
gotta love physics. :woot:
Boris
The Good Old Days
- Location
- The surf-less coast
Holly calculus.
Here's one for all you calculator junkies.
Train #1 leaves Naples Florida at noon and is traveling at 60 MPH heading north to Clearwater Florida which is 150 miles away.
Train #2 leaves Clearwater at 12.10 pm and is traveling at 30 MPH heading south to Naples Florida.
At what time do the trains pass and how far has train #1 traveled ?
:Banane01: :haha: :Banane01:
Here's one for all you calculator junkies.
Train #1 leaves Naples Florida at noon and is traveling at 60 MPH heading north to Clearwater Florida which is 150 miles away.
Train #2 leaves Clearwater at 12.10 pm and is traveling at 30 MPH heading south to Naples Florida.
At what time do the trains pass and how far has train #1 traveled ?
:Banane01: :haha: :Banane01:
w-nut
x2 nut
- Location
- christchurch new zealand
god wot have i started here :bigeyes:
Here's one for all you calculator junkies.
Train #1 leaves Naples Florida at noon and is traveling at 60 MPH heading north to Clearwater Florida which is 150 miles away.
Train #2 leaves Clearwater at 12.10 pm and is traveling at 30 MPH heading south to Naples Florida.
At what time do the trains pass and how far has train #1 traveled ?
the more improtant question do they sell beer on the train and wot one is going to finish closet to the water to get your ski out :arms:
ohhh yeah thanks for the help guys:biggthumpup:
Here's one for all you calculator junkies.
Train #1 leaves Naples Florida at noon and is traveling at 60 MPH heading north to Clearwater Florida which is 150 miles away.
Train #2 leaves Clearwater at 12.10 pm and is traveling at 30 MPH heading south to Naples Florida.
At what time do the trains pass and how far has train #1 traveled ?
the more improtant question do they sell beer on the train and wot one is going to finish closet to the water to get your ski out :arms:
ohhh yeah thanks for the help guys:biggthumpup:
All I hear is Blah. . . Blah. . . Blah. . . :banghead:
cookerq62
Life's Been Good
- Location
- Upper Bucks, PA
1:43'20"
103mi 1760'
???????
103mi 1760'
???????
Prem1x
Tinkering obsessed
- Location
- Austin, TX
FYI, a Yam 701 is Bore/Stroke 81mm x 68mm
an SXR (781) is Bore/Stroke 82mm x 74mm
an SXR (781) is Bore/Stroke 82mm x 74mm
dbrutherford
Parts Whore
- Location
- Fairmont, WV
I got close to that answer. I found the time for the trains to meet to be a total of 1.56 hours (rounded). So that puts the trains meeting at 1:33'20" PM. I got the same distance traveled by train #1 as you did which is 103.33 miles or 545,600 feet.
So if I am right, you were only off by 10 mins on the time (I would say an error in the head start part of the problem) and the units conversion on miles to feet.
I had to think about this one for a few to get my formula set up right. Then I calculated the answer and double checked it to make sure it was right.
Anyone else?
I ain't got smarts real good so I just use this :biggrin:
http://www.msgulfcoastvwclub.org/TechPages/Tech10.html
http://www.msgulfcoastvwclub.org/TechPages/Tech10.html