I had did some research and thought I had it all figured out but when i got into the project I've realized some of the info might not of been correct. I have a 99 SI that had the motor blow up so I bought a JDM B16A motor to replace it with. I thought that I would have to replace the oil pump and crank shaft position sensor but when I took the pulley off it turns out there's no where to mount the sensor!? What would I have to do to make this B16A work in my car? A JDM ECU? Is the wiring harness from my old one even compatible? Do I have to use my old intake manifold, I noticed the USDM had a few differences than the JDM. ANY advice would be greatly appreciated.

 

That's why you have to swap the oil pump, the USDM oil pump has the bosses to bolt the sensor to, the JDM one doesn't. You also need to reuse the original USDM lower timing cover. If your original engine died from anything oil related like a spun bearing don't reuse the old oil pump, either buy a new one or perform the CKF trick shown here --> http://technet.ff-squad.com/ckftrick.htm

See my above post for the CKF part of the swap. As far as the intake and exhaust manifolds go reuse the old ones if you have them, that's the easiest option. You do not need a JDM ECU, nor will you be able to pass emissions if your state has emissions testing (JDM OBD2 ECUs will not communicate with a scan tool)

 

Thanks but I think I might have got an older engine block, the front of the block doesn't seem to match the front of the original USDM one. I'll post pics of the two in a minute.

 

This is the front to the new JDM replacement motor I just bought:


This is my original '99 USDM front:


Notice how they don't match up?? I think the JDM one I got was from a 95 or 96 and doesn't match my 99 block ]: I don't see where to install the crank shaft position sensor??

 

Yes, in 1996 when they went to OBD2 they started mounting that sensor on the oil pump. Both are interchangeable with eachother and I know at least for the GSR, the OBD2 pump is cheaper.

Since your engine blew up, I would not reuse the oil pump that came on your original motor, at least not without disassembling and inspecting/cleaning it. You'll want to make sure there isn't any kind of bearing material inside and make sure the clearance between the parts of the pump are within spec. Get a new pump seal, oil pickup gasket and main seal and the pump is perfectly fine to use. Switching the pump isn't a bad idea to begin with. It lets you inspect the bottom end for sludge build up and bearing material in the pan/bottom end and ensure the pump is going to last for you as well as simplifying the wiring by leaving it all original.

 

Ok, I did buy a new oil pump but I don't see where I would plug the sensor in at? The old sensor was mounted on the outside behind the pulley. I don't see how it's mounted inside??

 

thats why i hate obd2.

 

Ok, I just realized how much of a noob I am. I didn't know that the oil pump was on the outside of the motor sealed to the block. HAHAHA! I think I can get this thing back together now! Thanks for the help peeps.

 

You have a few easy solution options....

1st, here is the difference between oil pumps.....usdm b series before 1996 did not use the crank fluctuation sensor, and neither did the new jdm b series 96-01....not the pic below


Because of the slightly different cast in the pump, the timing belt cover is also different



These parts can easily be swapped from one engine to another.

Another optin, is you could run the jdm ecu that simply doesn't look for the crank sensor, or vtec pressure switch

 

Please tell me the v-tech pressure switch is inside of the oil pump and there's nothing else I have to switch. I really didn't realize what I was getting myself into haha.

 

the pressure switch is on the head

 

Yep, it's screwed into the vtec solenoid, easiest thing is to just reuse the old vtec solenoid.

 

Just covert everything from the USDM B16A2 to the JDM B16A. So pretty much you're using the JDM head and block with USDM emissons/specs. This way you can retain the USDM ECU for smog. Cleaner too.

Whole Intake Manifold with Throttle Body*
Vtec Solenoid/Switch*
Dizzy
New Oil Pump with CFK Sensor*
Knock Sensor*
Engine Harness
New T-Belt/W-Pump/Tensioner

You should be set.

 

Thanks for all the help fellas, what spark plugs would you recommend I use??

 

NGK brand plugs, the size recommended, in the platinum core variety. They're like $1 more a plug than the coppers and don't have to change nearly as often.

 

Ngk bk6re copper plugs. Change at every 20k-30k intevals or so. Depends on how you drive. Really.