jdm b16 w/ 250 PSI compression?
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jdm b16 w/ 250 PSI compression?
hey i have had a JDM SIR-II b16a2 (1994) in my eg hatch for over a year and its running great. I installed the ctr intake cam and did a compression test just to see how it was doing........dead on 250 psi across all four cylinders. I'm positive we did the test right.
does this seem a little high to anyone else for what i thought was a stock cr?
I bought the motor from a shop in Asia I think they said they did something to it, but i just assumed it was stock. Has anyone reached these numbers with stock cr, stock head gasket and ctr cam on a jdm b16?
does this seem a little high to anyone else for what i thought was a stock cr?
I bought the motor from a shop in Asia I think they said they did something to it, but i just assumed it was stock. Has anyone reached these numbers with stock cr, stock head gasket and ctr cam on a jdm b16?
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Re: jdm b16 w/ 250 PSI compression? (deckster333)
i have a jdm b16 sir2 form a 93. compression is dead on at 240 across. seems like we both have the same issues. My car pulls pretty effin hard for a b16 tho. my motor was an auto, was yours?(maybe the condition of it)
Modified by sheBangZ at 7:41 AM 4/10/2006
Modified by sheBangZ at 7:41 AM 4/10/2006
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Re: jdm b16 w/ 250 PSI compression? (sheBangZ)
yeah im just tryin to think of possibilities, the test yielded dead on 250 psi all four, i just wondering if maybe the cr was bumped up or head gasket changed. I'm trying to find out because i want to jrsc it.
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Re: jdm b16 w/ 250 PSI compression? (EX-T)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EX-T »</TD></TR><TR><TD CLASS="quote">250 is pretty high but the cam isn't going to make your CR higher!</TD></TR></TABLE>
While it won't make his CR higher, couldn't it possibly make the compression read higher IF the cam was installed a tooth off?
While it won't make his CR higher, couldn't it possibly make the compression read higher IF the cam was installed a tooth off?
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Re: jdm b16 w/ 250 PSI compression? (EE_Chris)
the motor is set to stock timing andI know the cam def installed properly, does anyone know the compression numbers for a b16b type r, so i can compare them?
mine is a 5-speed
Modified by deckster333 at 7:22 PM 4/10/2006
mine is a 5-speed
Modified by deckster333 at 7:22 PM 4/10/2006
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Re: jdm b16 w/ 250 PSI compression? (EX-T)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EX-T »</TD></TR><TR><TD CLASS="quote">250 is pretty high but the cam isn't going to make your CR higher!</TD></TR></TABLE>
In most cases, a lumpier cam will make it read lower...
Sounds fishy to me...Test done at WOT?
In most cases, a lumpier cam will make it read lower...
Sounds fishy to me...Test done at WOT?
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Re: (deckster333)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by deckster333 »</TD></TR><TR><TD CLASS="quote">the compression tester i am using is made by "ACTRON"</TD></TR></TABLE>
Yeah thats what I used to. The autozone one lol. I heard they could be off a little. By off I mean the numbers could be slightly lower/higher in actuality. But as long as the numbers are all the same, you should be sound as a pound.
Yeah thats what I used to. The autozone one lol. I heard they could be off a little. By off I mean the numbers could be slightly lower/higher in actuality. But as long as the numbers are all the same, you should be sound as a pound.
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Re: (deckster333)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by deckster333 »</TD></TR><TR><TD CLASS="quote">i just got an email back from my guy at the shop i bought it from over in singapore, he said he thinks they put type r pistons in it.</TD></TR></TABLE>
I'd take that as a grain of salt
I'd take that as a grain of salt
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Re: (deckster333)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by deckster333 »</TD></TR><TR><TD CLASS="quote">i just got an email back from my guy at the shop i bought it from over in singapore, he said he thinks they put type r pistons in it.</TD></TR></TABLE>
ITR pistons would lower the compression. But CTR then maybe.
ITR pistons would lower the compression. But CTR then maybe.
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could be leaking injectors or oil getting in there somehow....i had some bad injectors in the gsr and the compression was almost 300!!!!...so check for that stuff.
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Re: (freakasis)
i redid the test and only cranked a few times instead of untill the needle stops and they all go right up 245 PSI. There is a really good chance there is ctr pistons in there and as stated that would make an 11:1 compression. hmmmm gotta think about the JRSC; which pulley and tuning.
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I have heard bad things about sea foam drying everything out, i ran a gas additive engine cleaner (guarenteed to pass) recently. maybe ill run it again and do another test to see if its carbon build up. Someone also told me 245-250 PSI is normal for a b16, but seems too high to me.
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