Fordmods Logo

AU straight gas versus petrol 

 

Page 1 of 2 [ 16 posts ] Go to page 1, 2  Next

 
 Post subject: AU straight gas versus petrol
Posted: Tue Jun 17, 2008 8:48 pm 
Getting Side Ways
Offline

Age: 49

Posts: 1343

Joined: 14th Dec 2007

Gallery: 1 images

Ride: EL fairmont offroader

Location: seaspray
VIC, Australia

Does anyone know the main differences between the straight gas AU motor and the normal AU motor? Particularly in regard to efficiency and gas system.

 

_________________

wrecking 9/97 EL fairmont sedan burgundy 6cyl auto 270k modBAintake

Top
 Profile  
 
 
Posted: Tue Jun 17, 2008 11:40 pm 
Getting Side Ways
Offline
User avatar

Age: 38

Posts: 900

Joined: 14th Mar 2007

Location: Castlemaine
VIC, Australia

The straight gas engine will have advanced ignition timing and possibly harder valve seats.

The falcon engines have the hardest stock valve seats, but the straight gas engine may be improved moreso.

I would assume the ecu would be different and the engine compression may also differ.

Im very interested in this area also, so if anyone here knows better please correct me :)

 

_________________

it can be fast and cheap,but it wont be reliable
it can be reliable and cheap,but it wont be fast
or you can be fast and reliable,but it wont be cheap

Top
 Profile  
 
 
Posted: Tue Jun 17, 2008 11:58 pm 
Getting Side Ways
Offline

Age: 47

Posts: 2015

Joined: 9th Mar 2005

Gallery: 4 images

Ride: Territory TX AWD & AUII XLS EGAS

Location: East Kurrajong
NSW, Australia

The actual main engine is identical ... compression ratio is identical ... valve seat are identical.

The only difference I can see is the throttlebody is a once-piece unit with the gas feed in the side of it (built in mixer ring) ... the ECU is different as well as it runs stepper motor metering instead of injectors ... spark map would be different as well.

Rocker cover is different.

That's about it ... oh there's colant lines running around the back of the engine to the converter as well.

Fuel lines are different and tank locations as well.

Oh ... there's also no cylinder shut-down setup in the ECU as well when temps get too warm ... due to backfiring issues ...along with lack of TC as well ... fro obvious reasons.

These are just to name a few things off the top of my head that I can remember when looking at both petrol and LPG engines side by side.

 

_________________

04 Territory TX AWD - Winter White - optioned up
06 Falcon BFII XLS ute EGAS - Winter White - EGA-54D Version 2

Top
 Profile  
 
 
Posted: Wed Jun 18, 2008 12:04 am 
Getting Side Ways
Offline
User avatar

Age: 38

Posts: 900

Joined: 14th Mar 2007

Location: Castlemaine
VIC, Australia

Nice work mechan1c thanks, hopefully those valve seats dont need to be any harder :)

 

_________________

it can be fast and cheap,but it wont be reliable
it can be reliable and cheap,but it wont be fast
or you can be fast and reliable,but it wont be cheap

Top
 Profile  
 
 
Posted: Wed Jun 18, 2008 12:11 am 
Getting Side Ways
Offline

Age: 47

Posts: 2015

Joined: 9th Mar 2005

Gallery: 4 images

Ride: Territory TX AWD & AUII XLS EGAS

Location: East Kurrajong
NSW, Australia

Nah I doubt it ... I had to replace my EGAS engine (as the head wouldn't part with the block ... so it was cheaper to replace the engine than try and get it apart.

I picked up a petrol AUIII engine with 66,000km on it ... it was the same really. Made the same power before and after replacement too. I found some info on it and they are identical block-wise. Not sure of the cam was the same though ... I used my cam I had anyway when i swapped the motors over.

 

_________________

04 Territory TX AWD - Winter White - optioned up
06 Falcon BFII XLS ute EGAS - Winter White - EGA-54D Version 2

Top
 Profile  
 
 
Posted: Wed Jun 18, 2008 12:31 am 
Technical Contributor
Offline
User avatar

Age: 39

Posts: 2516

Joined: 7th Nov 2004

Gallery: 4 images

Ride: LS3 VF

Location: Bunbury
WA, Australia

actually you are not quite right, the Egas motor has a different head and a different compression ratio
Top
 Profile  
 
 
Posted: Wed Jun 18, 2008 12:34 am 
Getting Side Ways
Offline

Age: 47

Posts: 2015

Joined: 9th Mar 2005

Gallery: 4 images

Ride: Territory TX AWD & AUII XLS EGAS

Location: East Kurrajong
NSW, Australia

On B-series yes the compression ratio was different in the EGAS models ... not on AU2-3 ... comp ratio is the same at 9.6:1

 

_________________

04 Territory TX AWD - Winter White - optioned up
06 Falcon BFII XLS ute EGAS - Winter White - EGA-54D Version 2

Top
 Profile  
 
 
Posted: Wed Jun 18, 2008 1:19 am 
Getting Side Ways
Offline

Age: 49

Posts: 1343

Joined: 14th Dec 2007

Gallery: 1 images

Ride: EL fairmont offroader

Location: seaspray
VIC, Australia

Is there a significant price difference, secondhand?
Are they available ex non commercial, did Joe Blow buy them too?

It seems that in my case putting one into an EB there wouldn't be much advantage, mainly just the inlet manifold. Despite petrol prices, living where i do i should probably stick to dual fuel.

 

_________________

wrecking 9/97 EL fairmont sedan burgundy 6cyl auto 270k modBAintake

Last edited by relaxed_diplomacy on Wed Jun 18, 2008 1:31 am, edited 1 time in total.

Top
 Profile  
 
 
Posted: Wed Jun 18, 2008 1:21 am 
Getting Side Ways
Offline

Age: 47

Posts: 2015

Joined: 9th Mar 2005

Gallery: 4 images

Ride: Territory TX AWD & AUII XLS EGAS

Location: East Kurrajong
NSW, Australia

I just got myself a petrol 2ndhand motor as there were more available with LOW km ... it was hard finiding an EGAS engine with low kays on it.

 

_________________

04 Territory TX AWD - Winter White - optioned up
06 Falcon BFII XLS ute EGAS - Winter White - EGA-54D Version 2

Top
 Profile  
 
 
Posted: Wed Jun 18, 2008 1:40 am 
Getting Side Ways
Offline

Age: 49

Posts: 1343

Joined: 14th Dec 2007

Gallery: 1 images

Ride: EL fairmont offroader

Location: seaspray
VIC, Australia

Yes, even Joe Blow would likely only choose gas if he does heaps of kays, thinking that if he doesn't he won't recoup the extra purchase cost.

 

_________________

wrecking 9/97 EL fairmont sedan burgundy 6cyl auto 270k modBAintake

Top
 Profile  
 
 
Posted: Wed Jun 18, 2008 2:30 am 
Technical Contributor
Offline
User avatar

Age: 39

Posts: 2516

Joined: 7th Nov 2004

Gallery: 4 images

Ride: LS3 VF

Location: Bunbury
WA, Australia

{USERNAME} wrote:
On B-series yes the compression ratio was different in the EGAS models ... not on AU2-3 ... comp ratio is the same at 9.6:1


i stand corrected.
Top
 Profile  
 
 
Posted: Wed Jun 18, 2008 2:37 am 
Getting Side Ways
Offline

Age: 47

Posts: 2015

Joined: 9th Mar 2005

Gallery: 4 images

Ride: Territory TX AWD & AUII XLS EGAS

Location: East Kurrajong
NSW, Australia

That's cool ... I thought it was the case as well .. and I started digging around ... it took me a while to find the info ... but I found it eventually.

I was initially surprised when i found that AUs were the same ... I know Ford has to change the B-series with stronger rods and I think they used dome-topped pistons to bring up CR as well. It was strange though that the B-series suffered more from backfiring issues moreso than the AUs ... maybe it was due to the different ingition/spark setup (coil on plug).

 

_________________

04 Territory TX AWD - Winter White - optioned up
06 Falcon BFII XLS ute EGAS - Winter White - EGA-54D Version 2

Top
 Profile  
 
 
Posted: Wed Jun 18, 2008 7:22 am 
Getting Side Ways
Offline

Age: 55

Posts: 903

Joined: 7th Sep 2007

Gallery: 3 images

Ride: BF3 Egas wag SY AWD Terry Ghia

Location: Brookfield
VIC, Australia

I must try to get me one of those gas mixer throttle bodies :)
Kind of sounds like a Gas research set up?

 

_________________

BF3 Egas XT Wagon
SY Territory Ghia AWD 6spA :))

Top
 Profile  
 
 
Posted: Wed Jun 18, 2008 7:33 am 
Getting Side Ways
Offline

Age: 47

Posts: 2015

Joined: 9th Mar 2005

Gallery: 4 images

Ride: Territory TX AWD & AUII XLS EGAS

Location: East Kurrajong
NSW, Australia

Best bet is from a wrecker if you can ... I am pretty sure FTG Autosalvage had one recently ... Ford want well over $1000 for it if you feel like getting a new one.

 

_________________

04 Territory TX AWD - Winter White - optioned up
06 Falcon BFII XLS ute EGAS - Winter White - EGA-54D Version 2

Top
 Profile  
 
 
Posted: Wed Jun 25, 2008 12:40 am 
Getting Side Ways
Offline
User avatar

Posts: 3331

Joined: 27th Dec 2004

Gallery: 4 images

Ride: MCMXCV Falcon

Location: G town
VIC, Australia

{USERNAME} wrote:
That's cool ... I thought it was the case as well .. and I started digging around ... it took me a while to find the info ... but I found it eventually.

I was initially surprised when i found that AUs were the same ... I know Ford has to change the B-series with stronger rods and I think they used dome-topped pistons to bring up CR as well. It was strange though that the B-series suffered more from backfiring issues moreso than the AUs ... maybe it was due to the different ingition/spark setup (coil on plug).


where did u find the info?

also i would be surprised if the EGAS didnt have different valves and seats....as its the weakest link in an LPG motor....ive seen heaps of badly pitted valves and seats on std falcon heads

 

_________________

Image

Last edited by gogetta on Wed Jun 25, 2008 1:24 am, edited 1 time in total.

Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 2  [ 16 posts ]  Go to page 1, 2  Next

Who is online

Users browsing this forum: No registered users and 23 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 Mon Dec 23, 2024 9:09 pm All times are UTC + 11 hours

 

 

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