Mofoco Head Problems, Fixes, and Perfomance- Post it all here

[H2OSB]

I'm curious I this has been going on all along with these heads(I did read the first page of the thread as it was being made, but went away for a while and it became 3 pages) or if this is a new issue. I don't recall seeing previous threads where these issues were mentioned.

H20SB
_________________
(o\_i_/o) I'm not a vegetarian because I love animals, I'm a vegetarian because I hate plants.

[Nightshift]

To reply is this a new problem, the answer is no. Give it a google search and you can educate yourself from posts 15 or so years ago. I wish I had done my research but I was focused on buying a made in the US product. All in all I fixed what was needed and I myself are very pleased with the outcome.
Nightshift

[chrisflstf]

So on the 2 cases of issues reported here, what is the cause of the seat overhang? Is the seat machined in the wrong place or is the port wall off. And the issue of the valve guide bosses being off center. Is that because the valve guide is mislocated or the valve guide boss in the head is off some?

I just looked at a set of AA heads I have and the seats and port walls are perfectly smooth, although it looks like it may have been slightly cleaned up. I can see 1 valve guide boss slightly off center, but only a few thou, not much

[calvinater]

where is Roy?
_________________
"Albatross"!

[Lingwendil]

Don't think for a second he doesn't know of this thread. I think he is sitting this one out.

Lots of constructive discussion here if one is willing to discern it. Hopefully he takes some of the feedback to heart. I wish him the best and personally would consider his heads in the future.
_________________
73 super beetle thread http://www.thesamba.com/vw/forum/viewtopic.php?t=649622 Back on the Road!

Modify your Kadrons for SVDA http://www.thesamba.com/vw/forum/viewtopic.php?p=8115884#8115884

Cast iron VJU4BR8 SVDA reference thread- https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0

Need replacement filters for original Kadron aircleaners? WIX #42087 is a perfect fit, as is Napa Gold #2087!

[Nightshift]

[Alstrup]

If the port hangs "in the port" its not much of a problem since it can be corrected pretty easy, and it will be easy to make the pressure recovery point right, or at least decent. The other way around creates loads of issues.

I doubt Roy will appear here, and that I fully understand. I DO hope he is taking notes though, and takes action no less.

Wrt the overhang and why. It is generally due to too inconsistent sand castings and poorly shaped/placed ports. The machining inconsistencies are most likely down to machinery with too much slack and not enough QC at/before the assembly point. I know nothing about which machinery they have today, but if the cylinder head machining station is the one his father bought back in the mid-late 80´s IIRC its probably time to retire it.
_________________
https://www.thesamba.com/vw/forum/viewtopic.php?t=435993

[gbaker]

Empi GTV-2 are the same. Super nice casting, just expect to strip them bare and re-do them. It’s a bummer you can’t buy them bare. We redid a set of the Empi’s and they came out super nice. Very good bang for your buck.
Jason Eggum did the same thing with a set and he went low sixes and possibly high-fives. I have not had a chance to personally see the Mofoco castings but I heard they’re nice as well.

[Nightshift]

[mark tucker]

I wont buy a set of heads and not take them apart. IMHO thats asking for some sort of issue. I have bought heads with the over hang seat issue...and they were welded up...and still had the issue when I get them..new, to some it matters. to others it dont. some would never know that is not supposed to be like that. and to others they are still scratching their heads trying to figure out what this thread is about. remember gex is still selling stuff. so yes there are a lot of clueless people to buy stuff and not know by looking at it thats thats rong. and if a seat falls out.....or resess??

[Ebel]

I bet it’s a whole list of issues causing this. It’s probably started at the casters. They are supposed to make the casting to specified size/ tolerance etc. they should have a set of blueprints for the casting itself. But more often then I’d like to see castings are off. They generally know this but ship them anyways. They know you ordered the casting 6 months ago and were given a shipping date that was three months ago. Then you get the castings. You inspect them. See they are off. You can either try to use them or try to return them and get new, correct castings. But. Your new castings won’t be made right away. They are at the end of another 6 month wait. But you have orders to fill based on castings you were supposed to get months earlier and be correct. Then the castings you did get. (That are sort of dodgy at best) need to be machined and finished to get out for late orders or put off another 6 months. So you try to use the best of the trash they sent you. Your fixtures and machines are set for a standard casting. But now stuff doesn’t line up. So you need to measure each casting and adjust for it or just run them as is. Then the guy running the machine doesn’t know or care enough to notice stuffs wrong. So you have all these crappy castings that aren’t machined quite right. But people still calling looking for their late parts. So. You think” these parts are being installed in vw engines. Nobody will really know. There’s no quality control after I ship them out. Or maybe a few will notice and it’ll have to be fixed” so you start shipping them. A few complaints. But most are just used because they weren’t checked or don’t know what to look for. Maybe the castings were designed Without enough material to allow for errors. I’ve gotten plenty of bad castings. But I make parts for airplanes and know they get inspected and if there’s a problem it comes back to me. I can see how this can happen.

[oprn]

I have been following this thread and am wondering if some fellows here are expecting top end heads at an economy head price? These heads do not seem to be that expensive to me. personally would not expect highly detailed heads for that price.
_________________
We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age)

[Nightshift]

[Rome]

[Nightshift]

[Nightshift]

The cost is very reasonable, I agree. Does that make it ok to send out heads with leaking valves, improper spring installation, offset guide bosses causing the valve springs to look like the Leaning Tower of Pizza. Frankly the answer is no.[/quote]

So to caveat my last post. Sitting hear making dinner and thinking. The price is reasonable as we agreed. As a business owner I realize there is a balance between profit and non-profit on each job. If the price is high you wont sell. I can not tell my customers that since the product is fairly priced, I did not put much care and zero QC into it.
Hope this helps.

[jpaull]

[nsracing]

I am not really sure whey the bosses are offset in those heads. You are better off doing them by hand if that is the case in manufacture. All you need is a piloted cutter.

Could it be the CNC needs some TLC in adjustments?

I have never seen offsets in Brazilians or CB heads. Wish Roy will chime in and see where all these unwelcome 'defects' are coming from.

[raygreenwood]

[jpaull]

Ray,

GREAT POST! You noticed some things that others have not caught on to. You mentioned basically its hard to get a reference point when there is not a sure spot that is 100% where the factory meant it to be. That is also in line with what NSRacing mentioned about maybe a CNC needing a adjustment. Those might or might not be related, but along the same lines.

The 40x35.5 050 Rasser seat overhang is about 2mm more then the 42x37.5 seat overhang, like if the 050 Rasser was just a standard 050 head with some 2mm smaller seats stuck in them. Like Modok said, you can take material away, but you cant put it back, unless you remove all the seats and tig weld it up, and recut for new seats. The lack of material under seat in several different heads mentioned could be a few issues. Bottom line, its good to check and see what a person can live with, and check these things before install or before you put it on the shelf for 2 years. As Roy mentioned, you cant set heads to the side for long before they need to be taken apart and cleaned or the valves could stick? So do all the checking soon as they are out of the box. He has been great about returning them/exchanging them within reason.