Fordmods Logo

high comp big $ head, now boost 

 

Page 1 of 2 [ 24 posts ] Go to page 1, 2  Next

 
 Post subject: high comp big $ head, now boost
Posted: Sat Mar 05, 2011 9:19 pm 
Smokin em up
Offline
User avatar

Age: 27

Posts: 238

Joined: 31st Jan 2008

Gallery: 3 images

Ride: EF

Location: ballarat
VIC, Australia

got a head off a previous engine that had 2G spend on porting etc,and has 30 thou taken off the head now im going boost and wanting to know the best way to do this i know Cometic do de-comp gaskets for vl's but not sure about the 4L, and how thick will it have to be with a zero deck height block and dished pistons. cheers

 

_________________

If it has wheels or a skirt, You can't afford it.

Top
 Profile  
 
 
 Post subject: Re: high comp big $ head, now boost
Posted: Sat Mar 05, 2011 9:28 pm 
Moderator
Offline

Posts: 14513

Joined: 7th Nov 2004

Ride: ford falcon au3 xr8

Location: a shit suburb in sydney
NSW, Australia

if your running dished pistons you shouldnt have to decompress the head anymore, you need to work out what the compression ratio is with the head and pistons your using, you dont want to lower the comp more than it needs to..

in saying that im running a std au xr engine with 9.6:1 compression on 14psi boost...
how much boost you wanting to put into it??
Top
 Profile  
 
 
 Post subject: Re: high comp big $ head, now boost
Posted: Sat Mar 05, 2011 10:14 pm 
Smokin em up
Offline
User avatar

Age: 27

Posts: 238

Joined: 31st Jan 2008

Gallery: 3 images

Ride: EF

Location: ballarat
VIC, Australia

The wastegate is set for 9 psi at the moment but I wouldn't mind trying to get 260-280 rwkws out of it

 

_________________

If it has wheels or a skirt, You can't afford it.

Top
 Profile  
 
 
 Post subject: Re: high comp big $ head, now boost
Posted: Sat Mar 05, 2011 10:20 pm 
Moderator
Offline

Posts: 14513

Joined: 7th Nov 2004

Ride: ford falcon au3 xr8

Location: a shit suburb in sydney
NSW, Australia

wild_cleveland wrote:
The wastegate is set for 9 psi at the moment but I wouldn't mind trying to get 260-280 rwkws out of it


like i said you need to cc the combustion chamber and work out what the comp ratio is before making changes..

im getting between 260 and 280 from a stock au xr6 bottom end and head,,,,
Top
 Profile  
 
 
 Post subject: Re: high comp big $ head, now boost
Posted: Sat Mar 05, 2011 11:18 pm 
Smokin em up
Offline
User avatar

Age: 27

Posts: 238

Joined: 31st Jan 2008

Gallery: 3 images

Ride: EF

Location: ballarat
VIC, Australia

thats some good figures there, mines 20thou over,ceramic and teflon coated hypertec pistons, full balanced bottom end with race series bearing, port and polish, bigger valves, stiffer springs, 977b cam which i will change, think it should make decent power?

 

_________________

If it has wheels or a skirt, You can't afford it.

Top
 Profile  
 
 
 Post subject: Re: high comp big $ head, now boost
Posted: Sun Mar 06, 2011 9:06 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

It's talk and hearsay till you find some facts...

High compression can be run with boost BUT timing and TUNE is MUCH
more critical...
Many have run two AU head gaskets and have had no issues ..
YES sounds bodgy but lets face it ..
It's just extra layers of metal gasket...
It increases the piston deck height.. On some larger bore engines this can
promote detonation..
Doesn't seem to be an issue on these engines with it's better
swirl through cylinder ports...
Mild boost on a well sorted system should net 300 rwkw...
With 42Lb injectors / 225 fuel pump etc...

 

_________________

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  
 
 
 Post subject: Re: high comp big $ head, now boost
Posted: Sun Mar 06, 2011 12:49 pm 
Smokin em up
Offline
User avatar

Age: 27

Posts: 238

Joined: 31st Jan 2008

Gallery: 3 images

Ride: EF

Location: ballarat
VIC, Australia

this will be with a t3 turbo so not sure how much that will make

 

_________________

If it has wheels or a skirt, You can't afford it.

Top
 Profile  
 
 
 Post subject: Re: high comp big $ head, now boost
Posted: Sun Mar 06, 2011 12:53 pm 
Oompa Loompa
Offline

Posts: 25

Joined: 22nd Feb 2011

Location: lochiel
SA, Australia

i made 300rwkw with a std comp EL motor. but its always going to be vulnerable to changes in temp etc causing detonation. a boosted 4l will always be happier at 8-1 than 9-1
Top
 Profile  
 
 
 Post subject: Re: high comp big $ head, now boost
Posted: Sun Mar 06, 2011 5:56 pm 
Getting Side Ways
Offline
User avatar

Age: 28

Posts: 4326

Joined: 30th Oct 2006

Gallery: 18 images

Ride: Envi EF

Location: Grafton
NSW, Australia

You can get 1.3mm MLS headgaskets. They were on ebay, not sure if they still are.

 

_________________

>>>EF Futura T build<<<

Top
 Profile  
 
 
 Post subject: Re: high comp big $ head, now boost
Posted: Sun Mar 06, 2011 6:08 pm 
Getting Side Ways
Offline
User avatar

Age: 35

Posts: 4285

Joined: 8th Dec 2004

Gallery: 25 images

Ride: EB2 Ghia,Mighty Boy,Eb1 Xr8 5spd

Location: ** In the Shed! **
VIC, Australia

I have a feeling ACL make a copper head gaskit for the SOHC I6 engines, could be worth looking into if you need to drop the comp a tad, after you have done the maths to work out what your comp currently is.

You can also fit water or water/alcohol injection to help fight off detonation if you need to. Otherwise I think ACL make a copper shim for the SOHC I6.

Cheers

ToranaGuy

 

_________________

I am the ToranaGuy!|74 Lh Torana Turbo|78 Hz PanelVan|86 Mighty Boy Ute|93 EB2 Ghia,GT Mockup,5spd,LPGI,Full Leather|2 x EB Xr8 5spd's|FS [VIC]: Wrecking - Eb XR8 - Parts available |Build Thread|Ebay Items - Ford Parts|

Top
 Profile  
 
 
 Post subject: Re: high comp big $ head, now boost
Posted: Sun Mar 06, 2011 6:33 pm 
Oompa Loompa
Offline

Posts: 25

Joined: 22nd Feb 2011

Location: lochiel
SA, Australia

i just run a ACL shim with a cheap fiber gasket either side, no issues
Top
 Profile  
 
 
 Post subject: Re: high comp big $ head, now boost
Posted: Sun Mar 06, 2011 10:07 pm 
Getting Side Ways
Offline
User avatar

Age: 64

Posts: 3552

Joined: 7th Nov 2004

Gallery: 4 images

Power: 482 rwkw

Location: Penrith
NSW, Australia

wild_cleveland wrote:
this will be with a t3 turbo so not sure how much that will make

What size t3 ??
Especially what size is the turbine housing ???

 

_________________

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  
 
 
 Post subject: Re: high comp big $ head, now boost
Posted: Sun Mar 06, 2011 10:19 pm 
Getting Side Ways
Offline
User avatar

Age: 48

Posts: 7029

Joined: 18th Apr 2005

Location: Hobart
TAS, Australia

You can't help this bloke out if he is going to play fill in the dotted line game. :lol:

 

_________________

Mind f**k!!! it works on feeble minded ignorant sheeples... there's plenty of em on this site... some are very intelligent but by god they are so thick!!!

Pakrat wrote:
You can buy them seppertly

Top
 Profile  
 
 
 Post subject: Re: high comp big $ head, now boost
Posted: Sun Mar 06, 2011 10:51 pm 
Smokin em up
Offline
User avatar

Age: 27

Posts: 238

Joined: 31st Jan 2008

Gallery: 3 images

Ride: EF

Location: ballarat
VIC, Australia

sorry man, i have to buy one to suit a t3 flange, any suggestions?

 

_________________

If it has wheels or a skirt, You can't afford it.

Top
 Profile  
 
 
 Post subject: Re: high comp big $ head, now boost
Posted: Sun Mar 06, 2011 11:04 pm 
Getting Side Ways
Offline
User avatar

Age: 35

Posts: 4285

Joined: 8th Dec 2004

Gallery: 25 images

Ride: EB2 Ghia,Mighty Boy,Eb1 Xr8 5spd

Location: ** In the Shed! **
VIC, Australia

wild_cleveland wrote:
sorry man, i have to buy one to suit a t3 flange, any suggestions?


Going to need bigger than a T3 turbo, have a good read on here at thread's like Troyman's and see what turbo they are running to get an idea.

Cheers

ToranaGuy

 

_________________

I am the ToranaGuy!|74 Lh Torana Turbo|78 Hz PanelVan|86 Mighty Boy Ute|93 EB2 Ghia,GT Mockup,5spd,LPGI,Full Leather|2 x EB Xr8 5spd's|FS [VIC]: Wrecking - Eb XR8 - Parts available |Build Thread|Ebay Items - Ford Parts|

Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 2  [ 24 posts ]  Go to page 1, 2  Next

Who is online

Users browsing this forum: No registered users and 7 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 Fri Dec 15, 2017 4:55 am All times are UTC + 11 hours

 

 

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