its a 98spec jdm itr motor and i decided to do a compression test. compression was 240+ on all 4 cylinders. however, all of the spark plugs were black at the tips. seems to be carbon buildup. only like maybe around 1/2 to 1cm of the tip was black. i guess my compression is good but why exactly are my plugs black? is this normal for a jdm r engine? i was told high octane in japan can lead to black plugs. is this true?

im sorry if this is the wrong forum to ask. just figured it is since it is a type r engine.

 

Searching is your friend...This link is in the FAQs section of this forum: Your compression is good...

http://www.dansmc.com/Spark_Pl....html

 

seafoam time

gets rid of carbon in engine... miles on your engine?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EG type GTR &raquo;</TD></TR><TR><TD CLASS="quote">its a 98spec jdm itr motor and i decided to do a compression test. compression was 240+ on all 4 cylinders. however, all of the spark plugs were black at the tips. seems to be carbon buildup. only like maybe around 1/2 to 1cm of the tip was black. i guess my compression is good but why exactly are my plugs black? is this normal for a jdm r engine? i was told high octane in japan can lead to black plugs. is this true?

im sorry if this is the wrong forum to ask. just figured it is since it is a type r engine.</TD></TR></TABLE>

240+ on all cylinders is a very healthy number. Carbon build up on the spark plugs is normal if your spark plugs are old. Specially if you do a lot of city driving.

The type r runs quite rich from honda to be safe from detonation. The downside is that if you do a lot of start and stop driving your plugs get ugly.

 

It amazes me that one can do a compression test but doesnt know what spark plugs should look like.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by walker111 &raquo;</TD></TR><TR><TD CLASS="quote">It amazes me that one can do a compression test but doesnt know what spark plugs should look like. </TD></TR></TABLE>

i didnt do it personally, had the shop do it.

i also was thinking about seafoam but im scared it might loosen up deposits and kill my compression.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by walker111 &raquo;</TD></TR><TR><TD CLASS="quote">It amazes me that one can do a compression test but doesnt know what spark plugs should look like. </TD></TR></TABLE>

He knows what they should look like and since there was alot of carbon build-up he was concerned and posted about it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EG type GTR &raquo;</TD></TR><TR><TD CLASS="quote">its a 98spec jdm itr motor and i decided to do a compression test. compression was 240+ on all 4 cylinders. however, all of the spark plugs were black at the tips. seems to be carbon buildup. only like maybe around 1/2 to 1cm of the tip was black. i guess my compression is good but why exactly are my plugs black? is this normal for a jdm r engine? i was told high octane in japan can lead to black plugs. is this true?

im sorry if this is the wrong forum to ask. just figured it is since it is a type r engine.</TD></TR></TABLE>

black means fine. i assume you replaced spark plugs and not running what came with the swap.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ck123 &raquo;</TD></TR><TR><TD CLASS="quote">seafoam time

gets rid of carbon in engine... miles on your engine?</TD></TR></TABLE>

Anyone who puts seafoam in there engine is an idiot...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Circuit Star-29 &raquo;</TD></TR><TR><TD CLASS="quote">Anyone who puts seafoam in there engine is an idiot... </TD></TR></TABLE>

Reasoning being...?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Circuit Star-29 &raquo;</TD></TR><TR><TD CLASS="quote">

Anyone who puts seafoam in there engine is an idiot... </TD></TR></TABLE>

I've put that stuff in my 260k accord. Still runs great, doesnt burn oil, and isnt leaking it either....