Guest PeterWakes Posted May 25, 2005 Share Posted May 25, 2005 are there differences in the internals of the s13 sr20 black top and red top? Quote Link to comment Share on other sites More sharing options...
greenmonster80 Posted May 25, 2005 Share Posted May 25, 2005 From my experience the internals are the same. I have never opened 1 up to double check. Differences are in the head and obviously the color of the cover. I do know that a red and black computer are not interchangeable even with exact stock setups. I have a friend who was more into these than me. My knowledge base is more with Skylines and their engines...but I have spent alot of time at his shop helping out with lots of Silvia / 180 builds.. Quote Link to comment Share on other sites More sharing options...
SR240Z Posted May 26, 2005 Share Posted May 26, 2005 S13 sr20 redtop and blacktop have same exact heads, but Hugh might chime in here and inform you about how the blacktops come with cast pistons i believe. Quote Link to comment Share on other sites More sharing options...
HeatRaveR Posted May 26, 2005 Share Posted May 26, 2005 The black top SR20's (starting with the S14) had variable valve timing, while the red tops do not. Quote Link to comment Share on other sites More sharing options...
SR240Z Posted May 26, 2005 Share Posted May 26, 2005 but hes asking about the s13 blacktop Quote Link to comment Share on other sites More sharing options...
Jsquared Posted May 26, 2005 Share Posted May 26, 2005 dammit people... S13 redtop and S13 blacktop have the same head EXCEPT that the S13 blacktop has cooling ribs externally. As do late redtops (last half-year or so of "redtop" production before they changed the valvecover color, so the 94-and-up 180SXs that still had S13 SRs would visually match the then-new S14 with variable-valve blacktop SRs). blacktop S13 SR has ribbed undersides of the pistons as well to help with cooling. S14 SR and S15 SR (all blacktops) are the ones with the variable valve timing (hump in the valvecover that peaks at cyl #3). electronics: redtop S13 SR and 94-96 blacktop SR are the same except for the O2 sensor (don't think wiring changed, just the size of the sensor... 75% sure on that). 97-98 S13 SR blacktops had the different wiring and ECU. Just like 94-96 S14 SR and 97-98 S14 SR had different wiring and ECU. Quote Link to comment Share on other sites More sharing options...
Guest PeterWakes Posted May 30, 2005 Share Posted May 30, 2005 thanks for all the information! Quote Link to comment Share on other sites More sharing options...
Jsquared Posted May 31, 2005 Share Posted May 31, 2005 any time with all the info I've found here about the old-school Zs, it's the least I can do to give some info back. oh, and sorry for the lack of patience I'm too used to the Honda kids flooding the 240SX forums that it's almost instinct to fire off a sarcastic salvo Quote Link to comment Share on other sites More sharing options...
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