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AU straight gas versus petrol 

 

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 Post subject: AU straight gas versus petrol
Posted: Tue Jun 17, 2008 8:48 pm 
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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.

 

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Posted: Tue Jun 17, 2008 11:40 pm 
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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 :)

 

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Posted: Tue Jun 17, 2008 11:58 pm 
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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.

 

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Posted: Wed Jun 18, 2008 12:04 am 
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Nice work mechan1c thanks, hopefully those valve seats dont need to be any harder :)

 

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Posted: Wed Jun 18, 2008 12:11 am 
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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.

 

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Posted: Wed Jun 18, 2008 12:31 am 
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actually you are not quite right, the Egas motor has a different head and a different compression ratio
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Posted: Wed Jun 18, 2008 12:34 am 
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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

 

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Posted: Wed Jun 18, 2008 1:19 am 
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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.

 

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Posted: Wed Jun 18, 2008 1:21 am 
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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.

 

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Posted: Wed Jun 18, 2008 1:40 am 
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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.

 

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Posted: Wed Jun 18, 2008 2:30 am 
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Mechan1k 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.
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Posted: Wed Jun 18, 2008 2:37 am 
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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).

 

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Posted: Wed Jun 18, 2008 7:22 am 
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I must try to get me one of those gas mixer throttle bodies :)
Kind of sounds like a Gas research set up?

 

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Posted: Wed Jun 18, 2008 7:33 am 
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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.

 

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Posted: Wed Jun 25, 2008 12:40 am 
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Mechan1k 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

 

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

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