Converting a Subaru to run on compressed natural gas - Subaru Outback - Subaru Outback Forums
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post #1 of 8 (permalink) Old 05-28-2007, 09:44 PM Thread Starter
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Converting a Subaru to run on compressed natural gas

I want to convert a 1999 Subaru Legacy Outback H4 2.5L to run on compressed natural gas. I have not been able to find any conversion kit companies that offer a Subaru model. Does anyone know if Subaru offers a CNG option outside the US that could be installed on a US car?

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post #2 of 8 (permalink) Old 05-28-2007, 09:58 PM
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Well, I haven't seen anything about CNG, but there was a video that FMGreen posted up a while back about an LPG equipped subie that you could buy straight from the factory in Germany. Here is the thread with the video, and some follow up info.

Interesting German Outback YouTube video

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post #3 of 8 (permalink) Old 05-29-2007, 12:00 AM
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No, but I understand coverting to Propane is not hard in the general sense.

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post #4 of 8 (permalink) Old 05-29-2007, 10:33 AM
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One problem you might want to consider is that vehicles that have been designed form the factory to run on natural gas usually have a much higher compressioin ratio than normal vehicles, Usually 15:1ish as apposed to 8:1ish. This lower copression ratio will result in alot lower MPG and alot less power when trying to run natural gas, If it were me I would just buy a NGV from the dealership.

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post #5 of 8 (permalink) Old 05-29-2007, 10:45 AM Thread Starter
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Thanks for the link

Thanks for the replies and the information. At this point, I am limiting my search to CNG retrofits, which I think offer the best balance of power, fuel economy, reduction in engine wear, and pollution reduction.
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post #6 of 8 (permalink) Old 05-31-2007, 06:37 AM
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LPG conversion

Hi guys,

Message from europe (Netherlands)

I did own several subaru's who are all converted to LPG.
the first was a MY1992 2.2 legacy (370.000 km then sold), the second a MY1998 2.0 forester (non turbo) (370.000 km also then sold), the one i drive now is a My2002 H6-3.0.

the first two had the brand "Vaille" onboard, the H6 3.0 has a (italian) Zavoli Aleisi N Zeta, system, this is a full sequential version (see picture)
the last system on onboard for 6 month's now (22000 km already)

although Subaru claims that such a system is impossible on a H6-3.0, we proved it is possible, without problems, afther 20.000 km there was no valvewear.

4 cylinder Subaru's have full garantee from Subaru if fitted with LPG, my former cars proved that with their mileage. with 4 cyl.. check and adjust your valves every 20/30.000 km, they did need that!

Stories, like other compresionratio? We never heard that one in Europe!
Almost all systems here are retrofitted systems, even those suplied bij Subaru from new. fitted on standard cars and engine's. I know of one exeption. The "newest" Forester has other valves fitted, when ordered from new, this is because valve adjusment is very difficult and expensive on these cars (don't know why, but it is).

hope this will help you

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post #7 of 8 (permalink) Old 04-26-2011, 05:58 AM
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Hi I am new to this forum and looking at what some of the cost are to convert a 2007 outback to compressed natural gas?
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post #8 of 8 (permalink) Old 08-04-2014, 08:41 AM
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Thanks, Harold, for the most informative input in this CNG/LPG thread. Seven years later, I hope even more options for LPG and CNG are available. I just bought a 2007 Outback H4 2.5L (SOHC) and began wondering about alternative fuels this morning. I hope you are still following this forum, as I'm wondering... what information and recommendations do you have regarding whatever Subaru conversion kits are available today? And are you driving a newer converted Subaru these days?

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