I am in the process of building a b20vtec and need to now exactly how close the valve clearences are and what exactly is the safest advancements on the set up with a b18c head? I know it makes higher compression so I wanted to know... Also the swap is going into a 89civic si. Should I convert to obd1 or can I get away with obd0....I was also thinking about sending the ecu out to zdyne for the one wire conversion.. I also plan on going with a skunk 2 intake to eliminate the secondarie butterflys problem. after doing so it should wire up the same as a b16a head as far as sensors go? please correct me if I am wrong. any input would be greatly appreciated..

 

As far as the valve specs go, call a Honda service place and get clearances for the B18C head that you're using. As far as the OBD stuff goes, if you want it to be 49 or 50 state legal, make sure that all the emissions equipment for the cylinder head that you're using is hooked up. I say the cylinder head (as opposed to the block) becuz youre buiding a frankenstein engine, which is already gonna get you into trouble at a smog station, and the head has alll of the emissions stuff on it. The only thing the block has is the oil pressure sender, if I remember correctly. Soooo, if you make sure the head follows emissions specs for the year it was made, you should be able to get away with the block.

 

I live in buffalo so I dont really have to worry about emmissions. Noone performs the smog tests around here. I am just more concerned with whether or not I am going to run into tuning problems do to using obd0 instead of obd1 such as the 2o2 sensors and the 4wire o2. also with the reliability of a obd1 distributer apposed to a obd0.

 

All of the distributors like to break, upgrading to OBD1 won't decrease that tendency.

Get a ZDyne and use your stock oxygen sensor, do the standard "one wire" VTEC hookup. You may want to look into their Super ECU, it is pricey but you'll be able to actually tune your motor rather than run what basically amounts to a stock B16A program.

 

does anybody who runs the b20 have any Idea about the valve clearance and how close it is.. especially with a b18c head.

 

Best I can do for you is the specs for a B17A. Intake is 0.15 - 0.19 mm (0.006 - 0.007 in); exhaust is 0.17 - 0.21 mm (0.007 - 0.008 in). Not sure if the specs are the same for all the VTEC motors but if anbody's got a '94-'01 Integra Helms manual they should be able to confirm the spec for the B18C.

Or you could go to *ghasp* a library and see if they have the Helms ya need.

 

whats a library? j/k Iprobably could even clay the piston and check the clearances but i was looking for a easy way out.