Fordmods Logo

increasing compression in au 2 ? 

 

Page 1 of 1 [ 11 posts ] 

 
 Post subject: increasing compression in au 2 ?
Posted: Sun Aug 28, 2005 8:20 pm 
Oompa Loompa
Offline

Posts: 49

Joined: 25th Aug 2005

Location: brisvagus
QLD, Australia

i currently have a head in the shop getting a port job done and was wondering if it is worhwhile getting a bit shaved off it to increase the compression?
is there any gains to be had ?
it will be getting tuned to run on bp ultimate
thanks jake
Top
 Profile  
 
 
Posted: Mon Aug 29, 2005 12:32 am 
Getting Side Ways
Offline

Age: 36

Posts: 7287

Joined: 5th Nov 2004

Gallery: 12 images

Ride: 1994 ED XR8 Sprint

Location: Somewhere in
QLD, Australia

a little bit extra compression never hurts....

 

_________________

Banned

Top
 Profile  
 
 
Posted: Tue Aug 30, 2005 2:36 am 
Fordmods Junkie
Offline
User avatar

Age: 38

Posts: 1000491

Joined: 6th Nov 2004

Gallery: 2 images

Ride: AUXR6 HP With Ducati SupA Bike!

Location: Perth
WA, Australia

upping the compression will allow for better combustion
meanign better fuel econ/power

 

_________________

RIP SCOTT

Top
 Profile  
 
 
Posted: Tue Aug 30, 2005 12:50 pm 
Oompa Loompa
Offline

Posts: 49

Joined: 25th Aug 2005

Location: brisvagus
QLD, Australia

how much do you think i should increase it?
is there any general rule of thumb ,say so many thou off the head will increase the compression by x amount?
thanks jake
Top
 Profile  
 
 
Posted: Tue Aug 30, 2005 1:53 pm 
Fordmods Junkie
Offline
User avatar

Age: 38

Posts: 1000491

Joined: 6th Nov 2004

Gallery: 2 images

Ride: AUXR6 HP With Ducati SupA Bike!

Location: Perth
WA, Australia

umm ther is a general rule i think f**k if ic an remember it
ask your head shop how much and tell them it will be tuned for ultimate etc
and they should be able to advise you on how much to increase it

ohh you can use a thin headgasket as well to help bump up the compression :)

 

_________________

RIP SCOTT

Top
 Profile  
 
 
Posted: Tue Aug 30, 2005 4:39 pm 
Oompa Loompa
Offline

Posts: 49

Joined: 25th Aug 2005

Location: brisvagus
QLD, Australia

no worries ,will talk to headsense and see what he reckons
thanks jake
Top
 Profile  
 
 
Posted: Tue Aug 30, 2005 5:22 pm 
Fordmods Junkie
Offline
User avatar

Age: 38

Posts: 1000491

Joined: 6th Nov 2004

Gallery: 2 images

Ride: AUXR6 HP With Ducati SupA Bike!

Location: Perth
WA, Australia

whos jake?

 

_________________

RIP SCOTT

Top
 Profile  
 
 
Posted: Tue Aug 30, 2005 8:00 pm 
Oompa Loompa
Offline

Posts: 49

Joined: 25th Aug 2005

Location: brisvagus
QLD, Australia

me
Top
 Profile  
 
 
Posted: Wed Aug 31, 2005 12:16 am 
Fordmods Junkie
Offline
User avatar

Age: 38

Posts: 1000491

Joined: 6th Nov 2004

Gallery: 2 images

Ride: AUXR6 HP With Ducati SupA Bike!

Location: Perth
WA, Australia

ahh ok got ya! when u said thanks jake it sounded like it was aimed at someone else
:)

 

_________________

RIP SCOTT

Top
 Profile  
 
 
Posted: Wed Aug 31, 2005 1:32 am 
Getting Side Ways
Offline
User avatar

Age: 64

Posts: 3552

Joined: 7th Nov 2004

Gallery: 4 images

Power: 482 rwkw

Location: Penrith
NSW, Australia

Yep talk to porter or machinist..Keep in mind piston to valve clearance...

 

_________________

As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

Top
 Profile  
 
 
Posted: Wed Aug 31, 2005 1:58 am 
Stock as a Rock
Offline
User avatar

Age: 57

Posts: 178

Joined: 3rd Aug 2005

Ride: Falcon XR6

Location: FTG
VIC, Australia

fs5 wrote:
how much do you think i should increase it?
is there any general rule of thumb ,say so many thou off the head will increase the compression by x amount?
thanks jake



Hey fs5,

I tend to think a general rule of thumb may be a dicey way of doing it when talking about compression ratio's.
The last thing you want is a motor that pings or detonates because a bit too much was accidentally taken off the head.

Best to acurately measure everything out, CC the chambers, calculate the piston deck heights, head gasket volume etc and then from there work out how much is needed to take off the head for a given comp ratio.

Unless you've got the tools and knowhow it's best left to the professionals.
And since you've already got your head at a shop being worked on they would be able to advise you how far you can safely up the compression and do the work for you :D


Cheers,

Alan.

 

_________________

95 EF XR6 Manual
Pioneer, Oz Audio, Butler, Image Dynamics, Audison
MEASQ - Aust Champion Intermediate Class 2006
MEASQ - Vic Champion Intermediate Class 2007
MEASQ - Aust Champion Intermediate Class 2007
MEASQ - Aust Champion Expert Class 2008
MEASQ - Aust Champion Advanced Class 2011 (Shared)

Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 1  [ 11 posts ] 

Who is online

Users browsing this forum: No registered users and 30 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

 

 

It is currently Sun Dec 17, 2017 9:12 pm All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names