need help/trying to switch motor from 2000 G20 into a 1993 SER

[DustinZ]

I am trying to swap the engine out of a 1993 SER with one out of a 2000 G20. The emissions and the head are all different. I don't think I can swap manifolds. Please help.

Dustinz

[nametakennow]

The 2000 motor is a lowport, the '93s was a highport, and the heads are different, so those parts aren't directly swappable. You're essentially stuck with the OBDII emissions equpiment, though it shouldn't matter since the car will be tested OBDI, I assume, since it's a '93.

As far as the head goes, there's definitely no easy way to swap it out. The new head provides a little more power stock, but isn't as responsive to modification and there aren't as many mods available.

What exactly would you like to know?

[DustinZ]

How to retain all of the emmisions and make it a factory fit. I can not delete the emmisions or I would. What really happened is a buddy of mine works for a dealer and they had the car come in. Instead of letting me find him a motor the dealer ordered one for too much and it was the low port out of the 2000. I am trying to find him some sort of resolve. I appreciate your help.

Thanks

[nametakennow]

Okay well, then what I said earlier applies.

With a late SR with all the OBDII equipment, he'll easily pass OBDI as well, he'll just have to inform the tester that if they intend to check his ECU for codes, they'll need to use an OBDII computer to do it.

Mechanically, it's basically a direct drop in, just take the old motor out and put the new one in.

The only problem I can see is electronics. The new motor has several more sensors and junk to contend with, so he will need a new wiring harness and definitely a new ECU.

Hit me on AIM later (nametakennow) or via email ([email protected]) and we'll talk some more, I'll run some searches and see what I can find.

[RED_DET]

Here is a review from somebody that tried this setup:

"The engine fits, but here is what i found. I got rid of all the smog system on the new motor and made a block off plate to cover where the EGR tube enters the intake manifold. I had to re-route the water lines that go into the egr valve when i removed it (yes water line on egr). the old power steering pump does not clear the oil filter so you have to grind off the little nipple that holds the line on the bottom of the pump, loosen the nut and rotate it a inch, A word to the wise dont try to put the oil filter assembly from your old motor on the new motor it doesnt fit because of the new intake manifold. This all leads to the fun part. It seems in 2000 when nissan revised the sr20de to a roller rocker motor they changed the head (of course) so your old intake manifold will not bolt up and the new intake manifold has high impedence injectors (17ohms). Guess what the old one used low impedence(11.5 ohms). The ecu wouldnt trigger the injectors so i had to figure out a way to make it work. Here where my options.a) Jim wolf reprogram computerb) Find top feed injectors low impedenceC) Figure out how to make the the ones i have work

I decided to go with option C. What i ended up doing is measuring both the high and low impedence injector and figuring out the voltage drop needed to get the ecu to think that it was firing a low impedence injector. To do this i wired a 39 ohm resitor in parallel with the two wires that fire each injector. the car fired the first time. Beside from a few vacuum leaks making the car idle kind of high everything works great. the new sr20de does rev alot quicker and seemd peppier than the old one but there are some downfalls. The rev limit is lower 6800rpm and the bottom end is not as strong as the older versions. the older version have this massive girdle that bolts onto the block via the main bearing caps the new one does not. In the future i will be taking the bottom end from a used sr20det rebuilding it and bolting the newer head to it. As soon as i get a chance i will set up a site for everyone to view pictures if wanted. oh and the old distributer bolts right up."

This is my opinion based on what I know:

So in a nut shell, its a whole lotta work for a motor that is weaker than the old highport motor. Just buy a JDM SOKO highport motor for like $400 and safe yourself the headache. Plus you get a 6 month warranty with the motor. I don't know how much the Roller Rocker motor cost you, but even if it was free, I would still have a hard time doing what all is necessary to make it work.

[nametakennow]

Good summary, and very true.

[IndyG20]

just buy a '99 SR (non-roller rocker), if you really need a P11 engine. even better, buy the JDM highport like the other guy said. unless youre going to get noticeable performance gains from a swap, stick w/ the original. youre gaining like what? maybe 5 hp. and a tad more torque...not worth it.

[DustinZ]

Thats what I figured. My friend called me at the shop one day and asked about the 1993 ser, if the motor would interchange out with a later one. I assumed he was talking about a later 90's sr. I told him they are the same long block. I has no idea the dealer he works for was going to order a 2000 g20 high port. I told him to let me find the motor after he told me the cheapest they found was like $1250. If anything it would have been like a free $900 in my pocket. But dealers always know best.... Thank you everyone for your input.

DustinZ