Cylinder Head Porn

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My 4Piston Racing cylinder head arrived yesterday, looks amazing they do great work. I new inlet manifold CNC matched should arrive soon. I will be busy this weekend:)

 

This is a K20A2 large port head that I will be putting on my K24A2 block. The K20A2 head swap is the hot ticket, the K24A2 was out of the Acura TSX, Honda gave it smaller ports for more torque to move a heavier  door car. The K20A2 is out of the Civic SI or Integra Type S. 

 

Graham 

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Work is progressing well, ready to start putting it all back together. 

 

Off with the head

 

Awaiting there turn 

 

 

 

 

Undercut inlet valves

 

 

All accounted for 

 

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Last piece of the puzzle arrived this morning, the CNC matched inlet trumpets for the inlet manifold. The Skunk2 Ultra Race manifold is using a 90mm Ross Machine Racing throttle body. The RMR TB uses a Ford TPS sensor, so yes there will be a single Ford component on my Honda engine. I did pick up a genuine NOS Motocraft unit, and got 2 for safety:)

 

Graham 

[DanM]

Nice looking piece of kit!   Looking forward to seeing it come together.

Edited February 16, 2023 by DanM

[Rosteri]

Thanks for posting the pictures, very interesting! 

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After all sorts of minor issues I took a first test drive on Sunday. I had to 3D print a TB pulley to get full throttle, and the alternator power connection hit the manifold, the fuel rail stand offs were to small, had to swap to studs to get the manifold installed. major grinding on the exhaust flange to port match it, normal stuff. It's rowdy, smoother, much more responsive, VTEC translon was much more noticeable. Scheduled for a dyno tune on the 20th. Will install some big injectors at the dyno shop, I was already getting to the top of the current injectors we had to play with fuel pressure on the last dyno day. 

 

Graham  

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Dyno day was Monday, Murphy never left the building. 

 

1. We upgraded to 1000cc injectors, when we opened the adapter kit there was only 3 adapters. The injectors did come with pig tails so we cut off the Honda plugs and installed the new plugs. I do not like adapters so I would have gone the hard wire setup, just not on Monday morning.

 

2. we installed a 2 bar MAP sensor as the new inlet manifold did not have a space for the Honda style sensor. The Hondata has a large drop down for MAP sensor, but alas not fir the AEM 2 bar. Luckily the AEM came with a tech sheet, but the data sheet was on KPA and the Honda uses PSI so there was a lot of maths to create a selection table.

 

3. Started the car and the MAP sensor was dead. Thought it was the wiring, screwed around, had another sensor and that one worked. 

 

4. First dyno run, crazy loud ringing noise, I thought we have damaged the engine. Careful checking and the engine mounts has collapsed just enough so the water pump pulley was hitting the steering shaft. The mounts had been on car since it was built on 2006, and the decided to die on Monday morning. A couple of think washers under the mounts got us up and running again. 

 

5. After a few tested the o2 sensor quit, swapped sensor and played around only to spot a pin had pulled out of the plug. So we were back up again, but did we damage the sensor?

 

6. But we were never able to get the HP we wanted, compression test, leakdown test all looks good mechanically, so we are confused, we are stuck at around 255 bhp, not even close to what we expected. 

 

We just ran out of time, I arrived at 9am and left at 5:15, so it was a long day. Did get to do a quick corner weight test, glad we did as I have screwed up one the the front shock setting. 

 

Track day at NJMP on April 8th, then we will start to search for the missing HP. 

 

Graham 

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First track day done, upgrades worked well, better mid range power, more punch out of the corners. I actually had to lift to let some faster cars pass on the front straight. Normally if it's a Porsche or the like you just point them by. A couple of time I actually had to lift, a new experience:) 

 

One only downside is the new throttle body is a little stiff off idle, a lot of stiction for the initial opening. This made the Octopus turn challenging. I think I have a possible spring adjustment and maybe I can re-route the cable as the pull is not quite in line, and lube the cable. 

 

The 3D printed pulley looks perfect so that was a success. 

 

Now we start the search for my missing HP:)

 

Graham