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compression ratios between xr and non xr 

 

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 Post subject: compression ratios between xr and non xr
Posted: Mon May 18, 2009 8:46 pm 
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is there a noticable difference power wise between ef/el xr6 compression ratio and standard ef/el compression
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 Post subject: Re: compression ratios between xr and non xr
Posted: Mon May 18, 2009 8:57 pm 
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power wise you wouldnt notice the difference..
according to the factory manual the std ef/el is 9.30:1 and the xr6 is 9.35:1..
which is bugger all really!
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 Post subject: Re: compression ratios between xr and non xr
Posted: Mon May 18, 2009 9:02 pm 
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also take into account that 95% of eseries heads have been machined for a new gasket, some of them a couple times !!
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 Post subject: Re: compression ratios between xr and non xr
Posted: Mon May 18, 2009 9:05 pm 
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you reckon id be better off just getting a non xr engine and putting higher comp pistons in, i was told was big difference in comp between xr and non xr
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 Post subject: Re: compression ratios between xr and non xr
Posted: Mon May 18, 2009 9:06 pm 
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just by fitting an Au headgasket will raise comp to approx 9.8:1
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 Post subject: Re: compression ratios between xr and non xr
Posted: Mon May 18, 2009 9:13 pm 
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i dont want to play around with my motor 2 many kms on it, i want 2 get a different motor and rebuild it with higher compression pistons,theres somthing seriously wrong with my motor, stage 2 cms cam stg 3 cms head, extractors full exhaust slightly bigger injectors, cold air induction, lsd manual and still being eatn alive by a stock v6 ecotec WTF
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 Post subject: Re: compression ratios between xr and non xr
Posted: Mon May 18, 2009 11:51 pm 
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Glowing EF wrote:
i dont want to play around with my motor 2 many kms on it, i want 2 get a different motor and rebuild it with higher compression pistons,theres somthing seriously wrong with my motor, stage 2 cms cam stg 3 cms head, extractors full exhaust slightly bigger injectors, cold air induction, lsd manual and still being eatn alive by a stock v6 ecotec WTF

could always try resetting the ecu or maybe getting a new fuel pump?

 

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 Post subject: Re: compression ratios between xr and non xr
Posted: Mon May 18, 2009 11:55 pm 
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its got new fuel pump, changed ecu 2 an xr6 new coil all new sensors and switches
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 Post subject: Re: compression ratios between xr and non xr
Posted: Tue May 19, 2009 12:16 am 
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Is the cam dialled in right??
I wouldnt recommend the bigger injectors either,

 

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 Post subject: Re: compression ratios between xr and non xr
Posted: Tue May 19, 2009 12:44 am 
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wow you should be leaving those ecotecs behind bigtime, stock for stock you should be beating them

 

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 Post subject: Re: compression ratios between xr and non xr
Posted: Tue May 19, 2009 9:34 am 
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Somethings wrong there for sure, with all those mods, the car should be going fairly hard i would of thought, a lot harder than a stock v6 commy.

Have you had it on a dyno to see what power its making and if the afr's are okay? I wouldnt recommend bigger injectors either unless they are AU items. From factory they seem to run fairly rich.

 

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 Post subject: Re: compression ratios between xr and non xr
Posted: Wed May 20, 2009 7:42 pm 
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cam was dialed by joe from cms, we redialed a few times 2 get it perfect, injectors are off an au, i dynod the car awhile ago before manual conversion, the stg3 cms head and the new coil, pulled 117rwkw, oh and cam was slighly smaller
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 Post subject: Re: compression ratios between xr and non xr
Posted: Thu May 21, 2009 9:31 am 
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ACL Race series pistons come with a 5cc dish as apposed to stadard 8.5cc, raises comp to 9.6:1 from standard 9.3:1, if you combined that with a AU head gasket you would get around 10.1:1. thats assuming every thing is standard to start with, it doesnt take many cc to raise compression a few points.

 

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 Post subject: Re: compression ratios between xr and non xr
Posted: Thu May 21, 2009 9:58 am 
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Glowing EF wrote:
cam was dialed by joe from cms, we redialed a few times 2 get it perfect, injectors are off an au, i dynod the car awhile ago before manual conversion, the stg3 cms head and the new coil, pulled 117rwkw, oh and cam was slighly smaller


Sorry if I missed it, but have you done a compression test on your engine? And is the ignition timing still stock or has it been changed? (yes, i know it's an ef)

Have you asked Joe what his thoughts on the matter are? Only because I know the majority of his cars (well those on here anyway) have been pulling good times and numbers...

 

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 Post subject: Re: compression ratios between xr and non xr
Posted: Fri May 22, 2009 9:01 pm 
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i had a problem before, i had a tooth out on my aux shaft, me and joe tried getting it back into place with out taking timing cover off, then after figured out that it only worked with troy (green machine) becase his bottom chain guide was broken, so we made the hole bigger for the bracket bolt on the dizzy dummy buteven before it still didnt feel right, and after didnt feel like much difference, im considering get a new bottom end, buying a ACL race engine rebuild kit and rebuilding it
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