FlatBlack Posted August 13, 2008 Share Posted August 13, 2008 Veritech-Z has this N42 closed chamber cylinder head with round exhaust ports. Exhaust ports look like they could have been square at one time with the round liner/disc mounted in over it? It looks like the quench pads are flush...not sure though. Doesn't the regular N42 have a wedge shaped chamber similar to the E88 chamber? *edit*never mind that last comment. Blue72 answered my question below.*edit* ...This is why I'm nervous to post on here haha. You guys are serious about everything being exactly right. I pulled my N47 head off my 78 last week and it has round exhaust ports that square off on the way back into the cylinder. In this thread the only other N series head I saw with round ports was the N42 pic I quoted above. I did some home-porting on mine as there is a lip [picture below] that made a big notch on the top side of the Exhaust ports. I cut grinded them off on my head. [The left one was untouched in this picture sorry it is hard to see]: Once again I apologize if this is irrelevant Link to comment Share on other sites More sharing options...
Guest agentc73 Posted August 24, 2008 Share Posted August 24, 2008 Here's an interesting head: A FACTORY E88 quench head!!! And a quick question for the seasoned vets, plz, respectfully: What pistons would you use with this one on the street, IF I buy it? Pros? Cons? Link to comment Share on other sites More sharing options...
Administrators BRAAP Posted August 24, 2008 Administrators Share Posted August 24, 2008 Here's an interesting head: A FACTORY E88 quench head!!! [ATTACH]8849[/ATTACH] [ATTACH]8850[/ATTACH] [ATTACH]8851[/ATTACH] ... That is NOT a quench head! Note how the entire chamber that is directly over the piston, is sunk into the head? That is an open pocket when the piston at TDC. A quench head has the actual chamber that is directly over some portion of the piston to be flush with the deck of the of the head, or the piston will have dome that fills any void in the open portion of the chamber at TDC, factory Datsun L-series pistons don't. Link to comment Share on other sites More sharing options...
Guest agentc73 Posted August 25, 2008 Share Posted August 25, 2008 Ok, now I'm seriously confused. from what I gather, THIS is the normal open chamber head E88 And This is the head that I speak of It's certainly not Open chamber. And why is everyone telling me they are exactly the same? Uhhhh.... Looks to me like the E31 style E88. But I'll shut up and listen... Link to comment Share on other sites More sharing options...
Administrators RTz Posted August 25, 2008 Administrators Share Posted August 25, 2008 It's certainly not Open chamber. Both of those heads are, in fact, open chamber. Go back to post #1 of this thread. Picture 1 illustrates an open chamber. Picture 5 illustrates a closed chamber. The semi-clean aluminum (near the bottom of the picture) is the quench area (If an appropriate piston is used). Link to comment Share on other sites More sharing options...
Guest agentc73 Posted August 25, 2008 Share Posted August 25, 2008 OK. I see the "flat" or "quench area" (I use this loosely here) in the pic I posted does NOT reach the deck surface. So, what would this E88 be called? Semi quench E88? Link to comment Share on other sites More sharing options...
JMortensen Posted August 25, 2008 Share Posted August 25, 2008 OK.I see the "flat" or "quench area" (I use this loosely here) in the pic I posted does NOT reach the deck surface. So, what would this E88 be called? Semi quench E88? You need to quit posting and go back to searching and reading. No such thing as semi-quench. Quench happens when the piston and chamber are very close to each other. No part of that chamber is close to the piston, except maybe a ridge around the outside. Go search and read, you'll find all the info you could want on this topic. Link to comment Share on other sites More sharing options...
yo2001 Posted August 26, 2008 Share Posted August 26, 2008 long time ago, I had E88 milled .100" and shimmed .080" before. After milled, it became a quench head. I'm sure some head like that still flowing around. Link to comment Share on other sites More sharing options...
Xnke Posted August 26, 2008 Share Posted August 26, 2008 Yes, that is possible to do. However, there are four different E88 head castings, all are open chamber, even though some are more "closed" than others. I still haven't figured out if the 260Z spec E88 is in any way different, other than possibly greater valve unshrouding due to the chamber shaping. Link to comment Share on other sites More sharing options...
1 fast z Posted August 27, 2008 Share Posted August 27, 2008 Yes, that is possible to do. However, there are four different E88 head castings, all are open chamber, even though some are more "closed" than others. I still haven't figured out if the 260Z spec E88 is in any way different, other than possibly greater valve unshrouding due to the chamber shaping. There are some VERY early E88's that are exactly like an E31. I should dig through my heads and see if I can take a picture of it. Link to comment Share on other sites More sharing options...
Daeron Posted August 28, 2008 Share Posted August 28, 2008 There are some VERY early E88's that are exactly like an E31. I should dig through my heads and see if I can take a picture of it. That is one of the heads that this thread lacks at this point. I went through it all about a week ago, and most everything else is in there as far as photos of stock or near stock pieces. It seems to suffer some from disorganization though. One of the more confusing issues (as is seen here) is the subtle differences in E88 castings, and even I am left somewhat mystified on that subject after looking through the thread. (I have seen literally dozens of E88s, and there have been times when I sat and studied the different chambers side by side a LITTLE bit, but I still need to look at photos to provide myself a mental reference of which is which) Would any of the original authors and photographers involved take offense if I were to spend some time, plagiarize some other people's words, and type up a single, clear, concise post with pictures and complete text descriptions (I am thinking rip off 1 fast Z's post largely for the descriptions and include any photos of any head posted yet..) Would a "re-post" of all that to make it one clear picture at this point be superfluous waste of bandwidth, or valuable improvement to the thread as a reference source? I wouldn't have a problem with letting it simply get copied back into the initial post on this thread if that is deemed wisest.. I am almost trying to get a mini wiki mentality started on this subject. Katayama knows we've got enough subtle variations to spawn internet misinformation for the next eon or so..... Link to comment Share on other sites More sharing options...
1 fast z Posted August 28, 2008 Share Posted August 28, 2008 I just went out and found it, Ill take a comparison picture tomorrow, against an E31. Link to comment Share on other sites More sharing options...
blue72 Posted August 28, 2008 Share Posted August 28, 2008 I wouldn't mind if someone went through and reorganized things a bit. If need be I have pictures of combustion chambers and intake/exhaust ports for a P79, N42 and a '72 E88. Link to comment Share on other sites More sharing options...
1 fast z Posted August 28, 2008 Share Posted August 28, 2008 I was thinking about organizing all of my heads, and taking lots of comparison photos. I have about 30 L series heads, which include all of the US heads, as well as the E30 setup. I would like to complete my collection with a couple of the over seas heads, that we never recived. Link to comment Share on other sites More sharing options...
Daeron Posted August 28, 2008 Share Posted August 28, 2008 I was thinking about organizing all of my heads, and taking lots of comparison photos. I have about 30 L series heads, which include all of the US heads, as well as the E30 setup. I would like to complete my collection with a couple of the over seas heads, that we never recived. I can't call it "mine" but between my uncle, my old man, and my brothers we have around 30 L6 heads or so as well. We have other L4 heads, too, but if I am not mistaken they are all bolted down to blocks It'll probably take me a couple weeks because of my housing situation right now, but I'll go ahead and do that cut and paste job. The photos are really the critical part; once they get posted somewhere with the descriptions of the heads that have already been penned, I think we might see a slight surge in the understanding levels among the lower echelons and newbies here.. When I was first really coming into my own in terms of L-6 knowledge, I know I cursed the lack of photos on the diverse "Head Description Page"s I was using for research; I suspect actually SEEING things like a closed, high quench combustion chamber as opposed to the open chamber might help many understand some of the more subtle differences betwixt the two. Link to comment Share on other sites More sharing options...
FlatBlack Posted October 7, 2008 Share Posted October 7, 2008 Does anyone know if any N47s were made without the Exhaust liners? I pulled the N47 off of my ATK-rebuilt motor and it did not have liners in it. I was talking with a friend and he thought the PO probably had them cut out. The N47 I just pulled off of my new motor did have liners and im sure has not been rebuilt. Link to comment Share on other sites More sharing options...
Administrators BRAAP Posted October 7, 2008 Administrators Share Posted October 7, 2008 I haven’t heard of the N-47 being manufactured with-out the liners, though that is not to say it didn’t happen. HS30-H or 1 fast Z are pretty savvy regarding what was and was-not offered from Datsun/Nissan. Maybe one of them will comment?... Any chance you could post detailed pics of those exhaust ports? Preferably from both perspectives, though the valve seat and the manifold face? 1 Link to comment Share on other sites More sharing options...
FlatBlack Posted October 7, 2008 Share Posted October 7, 2008 Well, I took pictures of both my N47s. I actually posted some pictures of my non-sleeved head above, I thought thats how it came. Little did I know! I havent put the new pictures on my computer yet but hopefully tonight I'll get that done. I also smoothed out my exhaust ports so it won't really be an accurate view of what was done previously to the head. Link to comment Share on other sites More sharing options...
ozconnection Posted October 19, 2008 Share Posted October 19, 2008 I just bought an N42 block and head the other day. The head looks like an N42 until I had a closer look and noticed that the intakes weren't notched and the head not drilled and tapped for EFI. Has anyone seen this and can anyone suggest why this N42 isn't like all the others I've seen? Cheers people. Link to comment Share on other sites More sharing options...
Administrators BRAAP Posted October 19, 2008 Administrators Share Posted October 19, 2008 I have seen that before here i the states from a JDM L-28. Not sure what it came off of. I recall being told it was a carbed/TBI truck?... TonyD or others would know for sure. Link to comment Share on other sites More sharing options...
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