A coworker of mine blusted the timing belt on his automatic '91 prelude 2.0si with the B20A5 motor. I pulled the head to find some bent valves so he sourced another one for me to replaced it with

The head on the car is a PK2A, he brought me is a PK3Y which I installed on the car. Everything went back together and now I cannot not get the thing to start.

The timing on the crank is aligned to the last white mark after the red mark(I have found no picture confirmation that this is the right one but with the head off it does put cylinder one at tdc) the cams were at tdc which had punches put into them when I installed the tb.

The car cranks over and sometimes sputters a bit but will not start.

I would like to get the car out of my garage but refuse to return a non running vehicle. Does the PK3Y head actually work on the B20A5?

I am going to go tinker on it some more but any feedback regarding small things that get disconnected that may cause a no start is appreciated.

I have searched this forum along with the rest of the internet and can only find that the PK3Y has been used to lower compression ratios for turbo swaps but that is it.

 

check the basics. check timing,spark and make sure its getting fuel. do a compression test also. any cel?

 

During my jaunt out into the garage it has spark and fuel and the thing is timed correctly as I have checked that multiple times. No CEL.

Compression test yields Cyl1-110; Cyl2-85; Cyl3-100; Cyl4-115.

I guess its the piston rings or the head. It should at least run poorly with such bad compression or is it loosing too much pressure to actually run.

 

not really sure. but that is very poor compression. not sure if it should run or not. but u have spark,fuel and the timing is correct. it should start...

 

I was just wondering if the PK3Y head ever did work with this B20A5. Reason is I'm about the buy one and wanted to make sure before I do.

 

That is poor compression.

90-91 Prelude motors: B21a1
90-91 Head stamp: PK3Y E-2 or E-3

88-89 Prelude motors: B20a5
88-89 Prelude head stamp: PK2Y E-1

88-91 Preludes can use all the following motors only for direct bolt in:

B20a (JDM version)
B21a (JDM version - rare)
B20a5 USDM
B21a1 USDM

If they paperwork says B20.5a then that is a B21a1

For those who ask what motors can swap in that are not 3rd gen specific, then the answer is:

H22/23 motors
But they require my H22 swap mounts for it to drop in.

 

Will the pk3y head work on a block that had a pk2 head on it?