Cometic mls

[tiger_e30]

Correct. My machining mentor was a die maker from IBM and made dies to press the CRT screens right here in Boca Ratron FL in the 70's. Not that it matters, but if I were to build a dual stamp die punch mold that required different diameter bores, the lower clam shell dies would have removable inserts for the inner upper shears that would bolt/pin into the assembly just for the bores specifically. All the outer dimensions would be stable, specially if you were investing five figures into each die halves themselves. Not likely they will change a two decade design at this point.

[ForcedFirebird]

I don't know much about the process but I would think once you buy the dies your investment is done. I'd imagine they just had a couple different bore sizes made with everything else the same

Correct. My machining mentor was a die maker from IBM and made dies to press the CRT screens right here in Boca Ratron FL in the 70's. Not that it matters, but if I were to build a dual stamp die punch mold that required different diameter bores, the lower clam shell dies would have removable inserts for the inner upper shears that would bolt/pin into the assembly just for the bores specifically. All the outer dimensions would be stable, specially if you were investing five figures into each die halves themselves. Not likely they will change a two decade design at this point.

[tiger_e30]

they readily produce different custom bore sizes for the m20 cant see how this would be different

I don't know much about the process but I would think once you buy the dies your investment is done. I'd imagine they just had a couple different bore sizes made with everything else the same

[digger]

Not really a minimum effort, I would gather they are using a die to stamp them from sheets. A die that stamps ~27"x8" would be rather expensive, and not easily modified. Unfortunately it happens a lot in the aftermarket/performance world - you get what you can and run with it.

they readily produce different custom bore sizes for the m20 cant see how this would be different

[tiger_e30]

Not really a minimum effort, I would gather they are using a die to stamp them from sheets. A die that stamps ~27"x8" would be rather expensive, and not easily modified. Unfortunately it happens a lot in the aftermarket/performance world - you get what you can and run with it.

Ah ok makes sense. i guess it would be easier to correct if they were stamping the hole to big

[ForcedFirebird]

Being busy these days is a blessing.

Man that's annoying first time with a mls and I thought for sure something was wrong. You'd think they could correct it with a minimum of effort.

Not really a minimum effort, I would gather they are using a die to stamp them from sheets. A die that stamps ~27"x8" would be rather expensive, and not easily modified. Unfortunately it happens a lot in the aftermarket/performance world - you get what you can and run with it.

[tiger_e30]

It's because they copied the VR gasket. The VR is the same way, just easier to get over the dowel when it's composite. They also copied the oval hole for the oil supply and head bolt, rather than having them separate like the Goetze/OEM gasket is.


Sorry, been busy at works and not singing in here much, but I haven't had any issues in the last 1.5 decades by opening the hole a little as Digger mentioned.

Being busy these days is a blessing.

Man that's annoying first time with a mls and I thought for sure something was wrong. You'd think they could correct it with a minimum of effort.

[ForcedFirebird]

It's because they copied the VR gasket. The VR is the same way, just easier to get over the dowel when it's composite. They also copied the oval hole for the oil supply and head bolt, rather than having them separate like the Goetze/OEM gasket is.


Sorry, been busy at works and not singing in here much, but I haven't had any issues in the last 1.5 decades by opening the hole a little as Digger mentioned.

[tiger_e30]

Thanks a ton for posting this thread when you did by the way - I would have taken a lot longer to figure out I missed my dowel pins during install lol.

I just ordered a replacement MLS from IE (and have dowels arriving separately). I will let you know if the dowel holes are the right size.

Oh dang glad you caught that. Would have really sucked to do all that work then have the head move! I'm glad it helped you out

[ForcedFirebird]

It's because they copied the VR gasket. The VR is the same way, just easier to get over the dowel when it's composite. They also copied the oval hole for the oil supply and head bolt, rather than having them separate like the Goetze/OEM gasket is.


Sorry, been busy at works and not singing in here much, but I haven't had any issues in the last 1.5 decades by opening the hole a little as Digger mentioned.

[tiger_e30]

Thanks a ton for posting this thread when you did by the way - I would have taken a lot longer to figure out I missed my dowel pins during install lol.

I just ordered a replacement MLS from IE (and have dowels arriving separately). I will let you know if the dowel holes are the right size.

Oh dang glad you caught that. Would have really sucked to do all that work then have the head move! I'm glad it helped you out

[tiger_e30]

dremel out the bore with a stone, just cover and protect the gasket so grit and metal doesnt get between layers etc

Will do. Thank you

[JehTehsus]

Thanks a ton for posting this thread when you did by the way - I would have taken a lot longer to figure out I missed my dowel pins during install lol.

I just ordered a replacement MLS from IE (and have dowels arriving separately). I will let you know if the dowel holes are the right size.

[digger]

Weird that one of my holes is so oversized then. I tried filing the dowel split but the block won't compress it beyond 12.50

dremel out the bore with a stone, just cover and protect the gasket so grit and metal doesnt get between layers etc

[tiger_e30]

Weird that one of my holes is so oversized then. I tried filing the dowel split but the block won't compress it beyond 12.50