Preliminary questions about engine conversion - Toyota Yaris Forums

Bishop · 10-11-2010, 09:28 PM

I have been considering converting my car to a hydrogen system, not not some hokey ebay bullshit. but the problem is, they do not recommend using the system on an engine with a higher then 9.5 to 1 compression ratio. I have a 2007 Yaris, its all stock. So the engine has a 10.5 to 1 compression ratio. The issue is because hydrogen burns much faster then gas, which can cause predetonation at higher compression ratios. I am hoping that because the engine is aluminum instead of cast iron it may not have the issue as much? If not, any ideas as to what would be a good engine to swap it with that has a 9.5 to 1 ratio (or lower)?

fnkngrv · 10-11-2010, 09:34 PM

wow...sounds like a hell of a project. I have no useful information for you, but I wanted to truly wish you best of luck...very cool.

why? · 10-11-2010, 10:21 PM

swapping the engine sounds like it would cost a ton. You could also look at getting lower compression internals. Rods and pistons I believe.

markitect · 10-12-2010, 03:59 PM

You might be able to get a head spacer made to drop it enough, but I haven't seen anyone with one on a yaris, some of the boosted people might use one.

*Astroman* · 10-12-2010, 04:47 PM

Yeah the boosted guys would know more. Sounds like a neat project!

cali yaris · 10-12-2010, 05:41 PM

Swap CP 9.5:1 pistons into it.

you won't need aftermarket rods unless you're going to make MORE than stock power.

10-11-2010, 09:28 PM	#1
Bishop I've made a post! Drives: 2007 Yaris Join Date: Oct 2010 Location: Chicago Posts: 1	Preliminary questions about engine conversion I have been considering converting my car to a hydrogen system, not not some hokey ebay bullshit. but the problem is, they do not recommend using the system on an engine with a higher then 9.5 to 1 compression ratio. I have a 2007 Yaris, its all stock. So the engine has a 10.5 to 1 compression ratio. The issue is because hydrogen burns much faster then gas, which can cause predetonation at higher compression ratios. I am hoping that because the engine is aluminum instead of cast iron it may not have the issue as much? If not, any ideas as to what would be a good engine to swap it with that has a 9.5 to 1 ratio (or lower)?

10-11-2010, 09:34 PM	#2
fnkngrv Mr. 155 and climbing View User's Garage Drives: Seriously Modded 07 Sedan Join Date: Jun 2006 Location: In The Hotbox Posts: 4,742	wow...sounds like a hell of a project. I have no useful information for you, but I wanted to truly wish you best of luck...very cool. __________________ Team Tiamat Racing on Facebook Youtube Channel: Team Tiamat Racing *Class record holder in Land Speed @ 154.5mph for 1.5 mile and 145.5mph in the mile in the F (2.016 to 3.014 L), G (1.524 to 2.015 L), and H (1.016 to 1.523 L) classes.*

10-11-2010, 10:21 PM	#3
why? Only Happy When it Rains View User's Garage Drives: Yaris LB Join Date: Jan 2006 Location: harnett county NC Posts: 4,097	swapping the engine sounds like it would cost a ton. You could also look at getting lower compression internals. Rods and pistons I believe. __________________ Colin Chapman disciple

10-12-2010, 04:47 PM	#5
Astroman Modded Moderator View User's Garage Drives: 07 Toyota Yaris, 71 Galaxie Join Date: Mar 2007 Location: Wenatchee, WA Posts: 3,670	Yeah the boosted guys would know more. Sounds like a neat project! __________________ Please visit my online store for computer stuff and Official Yarisworld decals!

10-12-2010, 05:41 PM	#6
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	Swap CP 9.5:1 pistons into it. you won't need aftermarket rods unless you're going to make MORE than stock power. __________________ Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific.

10-12-2010, 03:59 PM	#4
markitect Drives: Yaris Join Date: Oct 2008 Location: Michigan Posts: 199	You might be able to get a head spacer made to drop it enough, but I haven't seen anyone with one on a yaris, some of the boosted people might use one.

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