HOW TO: "Indentify" a 10:1 vs 9:5 SR20 motor by Oil Drain Tube?
The old sr20forum thread with more info on 10:1 vs 9:5
^Ok so I purchased a UK redtop back in "05" when I first joined the forum and didn't really know what I had. As I begin reading over different threads and post getting my newbie skills right. I discovered the differences between 10:1 and 9:5 SR20 motors. Anyway this thread has been created to give "The Dash" some extra info to indentify the UK/JDM 10:1 motors that have anywhere from 7-10 HP's more than the 9:5 SR20 motors. I will also include quotes giving the people credit for there opinions on the topic that I have pieced together.
insane imports - made a post on the old forum with pics showing the oil drain tube differences that he believes tells the difference between the two.
^USDM Oil Drain Tube
^UK/JDM Oil Drain Tube. Now this does not mean that every UK/JDM motor is 10:1 of course. This could also explain why some people that are putting turbos on JDM motors are getting better numbers than others when having the same modsat the same PSI levels. Something else to think about.
MORE THOUGHTS FROM OTHER MEMBERS
Originally Posted by Andreas
Here is my opinion on this.
Every motor that came from Japan with the tubular headers were 10 to 1
Every motor that came with regular headers were 50/50 9.5 to 1 or 10 to 1..
^I guess this makes since and the tubular header could have something to do with this????
Originally Posted by eric96ser 
Remove the head.
^This would give you your answer, but shouldn't there be another way to tell besides taking the head off????
Originally Posted by nx2000andy
there is another thread on this exact issue (that confirms this) and someone that had a number of sr20's (8) had them lined up and new through comp tests which was 10:1 amd 9:5:1 and there was a physical difference in the drain tube for the stock oil seperatortlet tubing near the sr20 scribed onto onto engine block10:1 was longer with two bends 9:5:1 shorter one bend..this is a SURE way to tell
^I still never found that thread and I would love to see it.
^This is my UK motor.
^This is the tubular manifold that came off of it.
^This is my JDM motor that I'm trying to figure out if it is a 10:1 or 9:5, now that the oil drain tube theory has came up.
^This is the NON egr cast iron exhaust manifold that came off of my JDM motor when I first got it. Although it used the cast iron header, this motor still had two bends on oil drain tube????
^Ok so I purchased a UK redtop back in "05" when I first joined the forum and didn't really know what I had. As I begin reading over different threads and post getting my newbie skills right. I discovered the differences between 10:1 and 9:5 SR20 motors. Anyway this thread has been created to give "The Dash" some extra info to indentify the UK/JDM 10:1 motors that have anywhere from 7-10 HP's more than the 9:5 SR20 motors. I will also include quotes giving the people credit for there opinions on the topic that I have pieced together.
insane imports - made a post on the old forum with pics showing the oil drain tube differences that he believes tells the difference between the two.
^USDM Oil Drain Tube
^UK/JDM Oil Drain Tube. Now this does not mean that every UK/JDM motor is 10:1 of course. This could also explain why some people that are putting turbos on JDM motors are getting better numbers than others when having the same modsat the same PSI levels. Something else to think about.
MORE THOUGHTS FROM OTHER MEMBERS
Originally Posted by AndreasHere is my opinion on this.
Every motor that came from Japan with the tubular headers were 10 to 1
Every motor that came with regular headers were 50/50 9.5 to 1 or 10 to 1..
^I guess this makes since and the tubular header could have something to do with this????
Originally Posted by eric96ser Remove the head.
^This would give you your answer, but shouldn't there be another way to tell besides taking the head off????
Originally Posted by nx2000andythere is another thread on this exact issue (that confirms this) and someone that had a number of sr20's (8) had them lined up and new through comp tests which was 10:1 amd 9:5:1 and there was a physical difference in the drain tube for the stock oil seperatortlet tubing near the sr20 scribed onto onto engine block10:1 was longer with two bends 9:5:1 shorter one bend..this is a SURE way to tell
^I still never found that thread and I would love to see it.
^This is my UK motor.
^This is the tubular manifold that came off of it.
^This is my JDM motor that I'm trying to figure out if it is a 10:1 or 9:5, now that the oil drain tube theory has came up.
^This is the NON egr cast iron exhaust manifold that came off of my JDM motor when I first got it. Although it used the cast iron header, this motor still had two bends on oil drain tube????
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