Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

Compression ratio

Vee-ard

QuickVR95II 2010 Survivor
Joined
Jun 11, 2009
Messages
758
Reaction score
5
Points
0
Location
Bayswater, WA.
Members Ride
Foam Tuned VR 5.0l Ute
wait.. what? No...?
 

ephect

Donating Member
Joined
Jul 27, 2006
Messages
5,901
Reaction score
15,427
Points
113
Location
Melbourne
Members Ride
VS Acclaim V6
9.4:1 is standard.

what are you trying to work out? if ur has had work done or?
 

Vee-ard

QuickVR95II 2010 Survivor
Joined
Jun 11, 2009
Messages
758
Reaction score
5
Points
0
Location
Bayswater, WA.
Members Ride
Foam Tuned VR 5.0l Ute
how do you work out compression from a pressure test?
 

delcowizzid

on holiday
Joined
Jul 8, 2008
Messages
6,988
Reaction score
445
Points
83
Location
NZ
Members Ride
в∞ѕтεכ √&
you cant ......
 

hako

Donating Member
Joined
Aug 1, 2004
Messages
8,020
Reaction score
95
Points
48
Age
80
Location
Toowoomba SE QLD
Members Ride
VS11 BT1 V6
The book says "min cylinder compression pressure 689Kpa at 9.35 CR." That's less than half of what Maldotcom2 has!
 

ephect

Donating Member
Joined
Jul 27, 2006
Messages
5,901
Reaction score
15,427
Points
113
Location
Melbourne
Members Ride
VS Acclaim V6
hako, i have the same figures in my book, quite possibly comp has been raised. unless the gauge is screwed?!
 

maldotcom2

New Member
Joined
Dec 11, 2008
Messages
1,035
Reaction score
2
Points
0
Members Ride
Cammed mafless VS Calais 5-speed.
Hako i read that part of the book too, hence why i'm asking. There are some online calculators to work it out but they required heaps of inputs like bore, stroke, etc. Thought someone might already know their figures so i can get an idea of whether it's normal or not.
 

delcowizzid

on holiday
Joined
Jul 8, 2008
Messages
6,988
Reaction score
445
Points
83
Location
NZ
Members Ride
в∞ѕтεכ √&
that is the worst case reading for tired old engine needing repair ide say
 
Top