madkaw

http://bit.ly/1455rTN Above is a link to the eBay ad

Okay guys, starting to get serious about this intake. I am in the process of trying to finish fabbing the plenum and need to decide on my TB. I guess what I really need to establish is size. I want to size to cover all my applications which will be 2.5 liter to 3.0 , NA and Turbo. I have read that going to big is a no no and not necessary - especially for the limits of my HP goals( 350-400 max) I thought 70mm would be plenty- any thoughts? I am probably going to just order an EBay universal application type. One reason is that most of those come with a base plate for me to weld on and I won't have to fab. Prices are around 100$ for a new unit with base plate.

RHD.com Japan

..006 and .008 cold

If you are serious about having the "best" ZG's, then order the Shoukia. The Classic Datsun ZG's are like all the rest. Shoukia's are the only ones I know of that fit right-and I have tried both.

Well I kind of gave up, but my issue is a bit different then yours. You issue was about a rocker that wasn't properly seated because the design of the lash pad. My issue is something in the machining is not true. Something is not parallel and the rocker grinding would be a bandaid fix. Someday when I put together another motor I will have the head re examined to see what the true story is. For now, I tightened the lash by .002 on every valve. It made a world of difference in the valve noise and the engine still runs very well, if not smoother. I appreciate all the help

Someone contacted me already about an extra bracket Thanks

That's a shame too- because this head has a lot invested, SS valves and some porting, ect...

Back from the dead thread! I was surfing the net for a possible bracket, I should have known someone here had already thought of it! Got any of these brackets laying around? I plan on running d585 GM truck coils- are the same? They look a little different in the pics, but hard to tell. The ones I have have the heat sinks on the bottom.

I tried addressing the rockers, but I decided to live with it after doing the first one. The more I thought about it, the more I realized I have a problem with this head that can't be fixed in this manner. Chalk this up to having a shop that does NOT have the experience with Z engines to have machined the head wrong. This wear pattern should have been checked during assembly. Though the rocker to cam wear is evenly spaced on the lash pad, the rocker was NOT evenly loaded on the follower surface . You can see the wear less on one side of the rocker. So either the cam lobes are not cut parallel with the head or the valve guides are not perpendicular to the cam. Whatever it is it makes the rocker ride unparallel between the two surfaces . This shows up more on the lash pads. Almost all of them show some extent of side loading . For now I have tightened the valve clearances and it did quiet the motor down. This head will go to Rebello this winter and hope its fixable

Bodywork is the slowest and most expensive repair

Thanks for the assurance. The wear pattern shows me the high spots so I know what to address. I think I can get them close enough, surely closer than they are now. Like you said, I could check them periodically for a while. What I didn't take a pic of was the wear pattern on the back side of the lash pad that sits on the valve stem. The other bad one actually shows uneven wear on the bottom side. Instead of a perfect circle wear mark , it's more of a half moon

I took the rocker and lash pad to my machinist. He kind of scratched his head on this one. As mentioned above- there could be several possibilities here. Guide not perfect Cam lobe not parallel to rocker He took the rocker to a true machined surface and laid it face down- lobe follower down against surface. He then used a dial indicator on the lash pad part of the rocker. Moving the rocker side to side you could see the lash pad area was not even across. You could almost make it out with the naked eye. So maybe I got 2 bad rockers? The lash pads measured square across the face . Possible fixes- replace rocker and worry about wiping a cam lobe on new rocker. Have the lash area grinded evenly across- if I can find where to do that. Tighten up the lash and see if this quiets things down

So with all rockers inspected, #2 and #10 are both the same with only half the pad in contact with the rocker. Some others show uneven wear, but it is very minor compared to the two I am talking about.

I will add that my cam lobe to rocker wear looks great and very even

Okay, I got some rockers off. Take a look at the second one I pulled off. Only half the rocker pad touches the lash pad, so it is sitting on there cock eyed I guess. Should I try and dress this somehow so it rides on there square-any recommendations? The others aren't as bad, but I haven't checked them all yet. It seems that my lash pads are the "H" type and it's not a matter of the rocker hitting the high spots on the sides. It's just very uneven wear, which seems worse.

Anyone have a good link for a thread on rocker removal? Ive been searching but...

Thanks Sam, I was just getting ready to post that I found the answer. It says in the manual to wire wasted spark COP the same as just COP. Like you said, it's all done in the firmware. One circuit makes it easy for the coils. Are you running 2 fuses for the injectors?

Soooooo- the actual noise is from the fact that the rocker arm is crashing into the lash pad during engine operation---because the valve adjustment is wrong for the reason that the arm comes into contact with the lash pad in the wrong area( the side). That is because certain pads were made differently. So upon doing the feeler gauge adjustment there is no load on the rocker to seat it properly on the lash pad so it is held up by hitting the sides of the lash pad. Under load the rocker crashes past this point and causes noise and improper valve movement or adjustment. So if I adjusted the valve at .010 with an improperly seated pad, the gap might actually be .014 or something like that. So am I understanding this fully ??

Thanks for the reply. The MS3x is capable of sequential spark and fuel, but for now it's all going to be batch- and that's where it gets a little foggy. I wasn't sure if I needed to spread the load of the circuits out to more than 1 fuse for the coils . This was also my question for the injector power circuits; was there a reason for showing the injectors split up into 2 fused circuits ( 4 cylinder example on megamanual ) I know the MS3x will run wasted spark, but do I wire the coils paired like you said or is the wasted fire all done with the software. Back to the megamanual

I believe I got it. I know the lash pads were changed for the cam geometry and the new followers cam from the Schneider kit, so who knows what I have- but some ticking noise !

Hey- I'm an IU fan, don't be talking about Purdue- lol My daughter graduated IU The valve noise issue is one of those deals where you think a certain amount should be acceptable being a solid lifter cam. I have looked for exhaust leaks because I have had that experience before. This head was completely reworked with a Schneider cam so lash pads were replaced for sizing. In fact I just cut the top off of a valve cover to do further investigation, but I might pull some rockers first. It seems to be mostly one valve, so maybe it's just not seating correctly.

Any updates for this thread? I have also been hearing excessive valve noise on my fresh motor. This is something I really need to look at.

Batch fuel injection is a waste of fuel- okay:0 You might want to rethink that statement. Of course, sequential would be optimum , but batch works just fine. I will eventually set up a sensor for the cam, but it is on the bottom of the list right now. A wasted spark and batch injection will be light years ahead of my dizzy and carbs for now.

COP wasted spark-basically both. I am going to run LS1 smart coils, but run them in wasted spark format. I will be using a 36-1 wheel. I actually drilled my flywheel and will use a Hall gear tooth sensor.