My buddys little brother just got his license and recently bought a 90 CRX SI . The Motor that's in it reads Just ZC on the block it is DOHC Looks like a vtec soloniod. The kid that he bought it off of said that the bottom end was built for turbo and has dish type pistons . I did a compression test on the motor and I only got to the first 2 clyinders o nthe vtec side and their in the 115 and 120 range is that supposed to be that low if it was just rebuilt I thought the compression after a motor was rebuilt would be 180. I would expect it to be atleast no lower than 160 on all of them.

1)Would these different sized pistons is the compression in the clyinders normal?
2)Also is this a JDM D16 motor that is DOHC?

 

You got a picture of this motor?

Those compression numbers are awfully low. Hope that your friends brother didn't get scammed into buying a bunk motor (which might have been boosted previously). Did the guy even say what kind of pistons were installed and what the compression ratio was supposed to be?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Redline130 &raquo;</TD></TR><TR><TD CLASS="quote">You got a picture of this motor?

Those compression numbers are awfully low. Hope that your friends brother didn't get scammed into buying a bunk motor (which might have been boosted previously). Did the guy even say what kind of pistons were installed and what the compression ratio was supposed to be?</TD></TR></TABLE>
+1

 

i dont know of a dohc zc motor jdm or american. can you look into it a bit more?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pimpwagon &raquo;</TD></TR><TR><TD CLASS="quote">i dont know of a dohc zc motor jdm or american. can you look into it a bit more?</TD></TR></TABLE>

Of course there is a DOHC zc motor - MOST people with EF's that say "ZC" are talking about the DOHC ZC, it was a very very popular swap in the 90's. Those motors are not vtec though.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jonathan_ED3 &raquo;</TD></TR><TR><TD CLASS="quote">

Of course there is a DOHC zc motor - MOST people with EF's that say "ZC" are talking about the DOHC ZC, it was a very very popular swap in the 90's. Those motors are not vtec though.

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i was drunk i meant no dohc zc with vtec. he said he saw a vtec solenoid. lol. im actually considering a mpfi swap and dohc zc right now.