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New cylinder head project


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#21 luvemfast

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Posted 24 May 2013 - 11:08 AM

there is a very pretty girl coming out to spend a little time this evening so little to no work tonight.

Let us know how you go with the "head" tonight then ???

#22 d3c0y

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Posted 24 May 2013 - 01:23 PM

Rough head is the best...

#23 Lurch ™

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Posted 24 May 2013 - 01:32 PM

Let us know how you go with the "head" tonight then ???


http://replygif.net/i/183

#24 luvemfast

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Posted 24 May 2013 - 03:56 PM

Let us know how you go with the "head" tonight then ???

http://replygif.net/i/183

Where do you find these? lol  ;D

#25 Xnke

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Posted 24 May 2013 - 04:35 PM

Not that kind of visit; I'm not that lucky...yet. Not for lack of effort, that's for sure!

She did help me go through the stash of bent files and cartridge rolls trying to find something to reach the last little bit of the short turn in the exhaust ports...there is a spot that I just can't get at yet and it's the last spot to do. After that, it's a little here, a little there, to get them all as close to identical as I can get them. (they're close, but they can get closer.) Port #1 was finished out completely, and match-up templates were made to make this job easier.

The intake ports, being round, are much easier for me; templates are simpler and there is less port re-shaping involved overall.

Exhaust ports will end up 30mm wide x 40mm tall, to match up with the header. Intakes are 38mm round; and I have 38mm templates made up from a past port job already, although they were for an E88 head...port is slightly different. P90 port is a slightly larger STR, and the valve guide bump is smaller.

The lower compression ratio from the larger volume will be most welcome; as going from a 42cc chamber to a 52cc chamber will drop me from 9.72:1 to 8.1:1...much more blower-friendly!

#26 dat240z

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Posted 25 May 2013 - 06:56 PM

http://replygif.net/i/183

Where do you find these? lol  ;D


Haha I love them too.... Theyre gif files. There are heaps of webpages with funny ones

#27 gav240z

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Posted 25 May 2013 - 09:14 PM

Guys I know it's funny but let's try and keep this on topic :).

#28 Xnke

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Posted 27 May 2013 - 12:33 PM

Done a bit more work on the exhausts in the last few days; got tomarrow off work, then work two days, then off two, weekend, off one, work four...going to be hectic.

All the valves are machined, need to clean up the backs of the valves and oil them till I'm ready for them. Tomarrow is a trip to the shooting range, get to blow off some steam and relax. I shoot 400 and 600 yard target matches about three times a year; so the highly structured practice helps with relaxation.

#29 Zedric

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Posted 30 May 2013 - 09:19 AM

I can definitely confirm this, I know that engine went to a guy by the name of Jack Kuzior who I haven't seen or heard from in years now. I recall him talking about the custom head re-drilling and cooling mods due to cylinder #5 (my memory here) getting hot under the collar. The head was N42 casting.

This is the car the engine was in last I knew of.
http://www.autospeed...83/article.html

His name is Jacek but people call him Jack, I remember (about 17 years ago). his engine was on the floor of Steve Newings shed and Sinisha's car was in there with L28 still in it .That yellow car was meant to be mine, I went to by the shell and an engine package from him, I made the mistake of getting excited about the rare shell and then he back flipped, kept the shell for himself and tried to tell me he was doing me a favor because it wasn't worth doing up. So I ended up with complete engine and drive line and nothing to put it in, man was I pissed!!! I remember him saying he would never put a G-nose on a Z, when I saw that autospeed article I thought  ???   

#30 Xnke

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Posted 05 June 2013 - 01:46 PM

Porting updates:

Exhaust ports are finished, will get a final 120 grit finish before the flowbench and will get polished after. I have one intake port roughed in at 37mm, finished port will be 38mm.

Progression of an exhaust port:

Posted Image

Posted Image

Posted Image

Posted Image


Good shot of a finished port:

Posted Image

Posted Image

I swear this port isn't as wonky as it looks...the port floor is level with the deck surface. I went and checked twice after taking this photo.

Posted Image

#31 d3c0y

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Posted 05 June 2013 - 01:54 PM

Nice work! Get that sucker to the flow bench on a couple of finished ports to see if it's working maybe?

#32 Xnke

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Posted 05 June 2013 - 02:08 PM

It's a known good template set that I am working from, the flowbench is just to equalize the ports. Even though the ports are worked to match a template, it's possible to have them off as much as 30CFM from each other.

#33 peter mc

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Posted 05 June 2013 - 05:35 PM

Man if i ported a head and it had 10 cfm different between ports Les would kick my ass,  i flow every port and 3 cfm is the max I'm aloud ,

#34 Xnke

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Posted 06 June 2013 - 01:26 PM

Yep. That's why I'm trying to find a flowbench to balance them out!

I'm not THAT good...I don't get to do this every day. Every couple months I do a few single-cylinder and two cylinder engines, sometimes a set of VW heads. I have done datto heads a LOT, but it's a cut-and-try thing. As it is, I use templates to match the ports up as close as I can get them, but even then I have a long way to go before I can really skip a flow-check.

The exhaust ports I have pretty damn tightly matched, volume and shape wise. Each port matches the templates within 0.040", and that's just one port that is out that much...the rest are half that out. One of the combustion chambers has a small casting error, the exhaust valve seat is a little closer to the chamber wall than the others, and the intake is a little further away. Can't move them as much as I need to...the port wall would get into the valve seat area. I'd need to go to a slightly larger valve to get the seat pushed out enough. If this was a race car...I'd already have fixed the issue.

It's not a race car...it's my daily driver, that I've been without for nearly a month now. I'm getting impatient and it's getting harder to convince myself that close enough is not close enough.


#35 Xnke

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Posted 15 June 2013 - 07:59 AM

Had a bit of mixed luck this afternoon!



I missed a buy of a 1976 Toyota RA22 Celica by fifteen minutes...the car sold for scrap metal to a dealer. I have called said dealer trying to throw money at him to get it before he crushes it.



BUT! I found a local flowbench and slapped the currently-37mm-ish ports on it, and did a little flow work! This is with what's left of the old valve job, on used, but clean, stock-sized valves. I lapped the valves in to get them to seal up closed, but that's about it. The top angle of the 3 angle job is still there, but a lot of the bottom angle isn't or is modified from the die grinder.



Lift - Intake Flow
.1 - 62.4
.2 - 117.1
.3 - 157.8
.4 - 199.1 (FIGJAM!)
.5 - 214.1



Lift - Exhaust flow
.1 -- 51.4
.2 -- 80.3
.3 -- 102.1
.4 -- 128.8
.5 -- 134.1



Not too bad! I have no idea how this compares to a stock port; as I don't have any heads with stock ports except a Maxima N47. I also have no idea if this bench is padded/accurate/garbage...it's an old garge-built unit that seemed pretty consistant, though. I was getting very close to the limits of the bench, I had the air valve wide open to get the full 28"WC for the upper end of the intake flow. A guy in the back of the neighborhood has it, but he's moving out this week. I saw it in his garage and asked if I could borrow it for a few minutes. An hour later, I was done and helped him load it into his moving truck.



I asked...he didn't want to sell. I have a very good idea of how to copy it though...



#36 Xnke

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Posted 19 June 2013 - 10:35 AM

Posted Image

That's a finished intake port, The flow at 37mm was good enough that I blended the roof and sides into the 38mm intake manifold and called it done. The head goes to the machine shop for a proper valve job, S3S, and a second pressure test to make sure this one isn't cracked or ported badly...It happens.



#37 Xnke

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Posted 21 August 2013 - 01:24 PM

Got the head back on the car, took a little vacation and hoping this saturday/sunday I'll have enough time between painting a motorcycle and racking some homemade wine to get the oil and filter changed, and get the new head/cam run in and the lash settled out.

After about a month, I'll get the super back on and we'll go see how the cool September air treats this dogged out transmission before I swap in the beefed up FS5W71E still sitting in my garage floor.

#38 d3c0y

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Posted 22 August 2013 - 08:12 AM

Whats a 71E trany out of?

#39 Xnke

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Posted 22 August 2013 - 11:29 AM

Mine is from a 1997 Frontier pickup with the VG33ER engine, 3.3L M62- supercharged SOHC.

#40 d3c0y

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Posted 22 August 2013 - 01:49 PM

Ahh ok interesting, i wonder if we got those here?




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