Cylinder head codes

[wurlycorner]

Nope, something obviously didn't come across there...
Forget P13 heads, forget any hassle associated with swapping heads (and I'm well lost with P5M suddenly cropping up now also )

You're doing a fresh n/a build, with an ATR or Skunk 2 IM, which head would you choose and why? (from PDE, P5P... Or also P5M?)

[Merlin]

I dont know what P5M is, I think that is mistaken identity. It should be P5P.


Ok fresh build, engine out all in bits and I assume it is for a performance build. If you had to choose I would go for the PDE or 99+ P13 as that head used sprung LMA's. If you want sprung LMA's in a pre-99 P13 or non-PDE head you reportedly need to add a shim to the bottom of the LMA. Other than that the differences are academic as if you are shooting for a performance build all heads will need work.

From the lude god himself:

There are actually a number of differences between the P13 and PDE cylinder heads but most of them are not performance related and some of them not really worth going into.

Likewise not all P13 cylinder heads are the same !!

First things first.

PDE does not have what I would call a "port and polish". The bulk of the intake and exhaust ports are the same as any other H22 head, ie left as it was cast. It's only really a little bit of finishing work at the valve throat that sets them apart (when comparing bare head to bare head).

Other differences - PDE and 98 on casted P13s (on a H22a8 block) have spring LMAs (lost motion assemblies) rather than the hydraulic plunger type of all earlier heads. The machined housings for the LMAs in these later heads are just about 1.5mm shallower than the early ones. You can still use the later "spring LMAs" in earlier heads but you need to add a flat washer to the underside of them so they work effectively.

PDE heads are unique casting to the intake side which was specifically designed to work with the ATR intake manifold design. It's designed for the unique IACV and EGR system found on the ATR.

Personally, unless you really want an ATR head and are not interested in porting, upgrading cams, valve springs etc then I wouldn't bother going to look for one... work with the P13 and make a better job of it than Honda did

[wurlycorner]

I dont know what P5M is,

Was in your post - I wondered about typo too, but M and P are not next each other on the keyboard, so I assumed it must be some other magic stuff you knew of


So going back to thebusofwoe's post we're saying that his Type-S engine will have a P13 head on it, but depending on the model year, it might have the later sprung LMA's etc.



I'm gonna be sticking with this, then;



As someone else has commented... That looks well cared for - nice and golden

[Merlin]

Yeah my bad.