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Another OHV M90 build

Discussion in 'Need for Speed!' started by Dono, February 10, 2012.

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    1. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      We havn't discussed porting yet. Ya, I guess it is the easy way out for sure. If I could find a press to borrow, I'd go for it, but I just cant see myself ever needing it again.

      Looking at the case, Im not comfortable with taking any material off that will leave an edge to score the blades either. The tolerances are pretty tight.
       
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    3. rocket 5979

      rocket 5979 Resident Gearhead

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      He never talked to me about that so he must still be planning on doing it himself before he sends the unit to me.

      EDIT: Ooooor not at all. lol
       
    4. jd4242

      jd4242 Elite Explorer

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      im just given you a hard time:Dyea i didnt either thats why i sent mine out and they are going to do a full rebuild and recoat the blades,basically a brand new unit thats ported and polished:D
       
    5. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      Id never be able to show my face on this forum again if I didn't do something for porting.
       
    6. rocket 5979

      rocket 5979 Resident Gearhead

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      Don I know I would stand to make a few bucks if I ported your blower for you but it is not like you really have to do it. Obviously it will help and I would be happy to do the job for you but sometimes getting every little bell and whistle upgraded isn't in the budget. Don't feel obligated because you think we will tease you. I promise we won't........ok, maybe just a little bit. But only because you gave us the idea to do so. ;)
       
    7. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      haha, yup. I'd tease too.

      I hear you, that the gain in power per dollar isn't huge, and it is still time spent that needs to be accounted for.

      I'm still on the fence. Part of what we are doing here is learning by doing ourselves. Ugh. Decisions. It will come down to the cost of shipping. If shipping makes costs the same as buying the press, I'll buy the press. Even if I take it apart and store it after.

      I think I can do a basic port/clean up on the casing. From the documents Rocket sent me (Thank you Rocket!) the real power gain is on the inlet side. It looks like if I port the top side of the inlet, that helps quite a bit. Also, on the outlet, Just taking care of those two screw casting protrusions, and radiusing the edges and smoothing them out helps.

      I definitely appreciate Rockets honesty on all levels, and want to thank him for that. Thanks Rocket!
       
    8. rocket 5979

      rocket 5979 Resident Gearhead

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      If you decide to do things yourself I would suggest that you do the porting work before sending it to me so that no bearings have a chance of getting any aluminum shavings in them. You can tape them off too if you really needed to, but if I am rebuilding a blower then I just port it first and rebuild after.
       
    9. blk mk8

      blk mk8 Active Member

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      you really have to be careful with that stuff. always best to go with expert when porting a blower or any thing that can have drastic affects on air flow. i say send it to rocket but its only cause he is a good guy..
       
    10. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      High volume fuel pump. Check one off the list.

      No fun. I couldn't get the fuel line off. I was able to get the assembly out of the fuel tank with some maneuvering and replace the pump. Im glad its done.
       
    11. jd4242

      jd4242 Elite Explorer

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      Witch pump did you use? Haven that body lift made mine a cake walk;)
       
    12. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      It's a treperformance 255lph pump. Price was $85 (+shipping). Has a really high pitched whine at idle. I guess my ears are still working not too bad. The noise is baily audible, but I can hear the noise compared to a oem.

      I'm glad that jobs out of the way, I hate rolling around under vehicles.
       
    13. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      M90 porting

      Here it is.
      I couldn't do much on the intake side unless I want to work with the intake manifold also.
      On the exit, the only area that could touch the blades I changed was at where I changed the bolt housing.
      Other than that, I just radius'd the edges out. Here's a couple pics.
       

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    14. jd4242

      jd4242 Elite Explorer

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      Looks good man.not to drastic,clean and larger.should help alittle.how does your blades coating and inside the charger walls look?
       
    15. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      I think my M90 is too old to have a epoxy coating on the blades. I don't see any coating at all.

      The walls of the case are a bit scored up, but I don't want to touch the walls at all, as this will remove material and increase the gap between the blades and the case.

      The scoring isn't too bad. I see far worse pictures on the net (For what that's worth).
       
    16. jd4242

      jd4242 Elite Explorer

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      I looks super clean is why i asked.mine has soooo much carbon build up its crazy.i can still see some coating on the blades.oo yea dont touch those inside walls it would make it worse.
       
    17. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      Mine had no carbon on it at all. I don't know the history of it though. I do know that the last time the snout was taken off, no sealing material was used on re-assembly though. Maybe it was cleaned, new oil fill, and not used?
       
    18. jd4242

      jd4242 Elite Explorer

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      Could be,maybe whatever was used to clean it also took the coating off the blades.not having any would worry me:(
       
    19. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      If my m90 gives grief after install, I wont have much choice but to fix it. Maybe I'd be able to get an exchange on the blade assembly somewhere.

      I do know the early versions of the supercoup m90 didnt have a coating on the blades from factory though.
       
    20. jd4242

      jd4242 Elite Explorer

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      What really??i didnt know that,swore all blades had some sort of coating.i wouldnt think they would be as efficient as a coated unit.i know for the 3800s they made all with coating and each gen had better coatings and it made a difference
       
    21. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      I think your right on them not being as efficient. Or maybe I was reading information posted by a guy that had no idea what he was talking about. I'm not sure.

      I'll have a closer look at my blades for signs of a coating, or a coating that once existed.
       
    22. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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    23. jd4242

      jd4242 Elite Explorer

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      Aww interesting. I knew the gm m90 was more efficient and made more power but never really knew why.i knew the inlet was larger and could be made larger more easy but didnt know about the coating.i knew the 3800 had two or three different coating and know the gen 5 is the best but some say the gen 3 was more reliable because i think they have changed or went back to that coating lately. So really your be fine just wont be as efficient or boost as much as low.
       
    24. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      Well, a Friends uncle has a press. Im in luck. I still don't have my rebuild kit though.
      It shipped Monday of last week.

      I tapped the shaft out, snout bearing and seal, and case needle bearings with sockets, extensions, and a hammer. They came out pretty easy, I was surprised.

      Now, I can tke the case and snout in for an estimate on powdercoating.
      Also, I can take the shaft around to try to find a piece of pipe that will work for removing the shaft bearing. That will need a press for sure.

      I'll be using the press for sure when inserting the new bearings. I have to say, Im really amazed how easily the shaft, snout bearing, and needle bearings came out.

      Im thinking gun metal grey also on the color. Hate to be a copycat, but the ford grey paint just looked not nice.
       
    25. Dono

      Dono V8 Limited turbo and retired SC 4.0 OHV Elite Explorer

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      I mounted my boost/vac gauge. Pretty easy, really. I'll see how it works out.
      Still no bearings for the M90. Stuck in customs.
      I found a guy that will powdercoat the casing, but I have to wait till he has another job he can piggy back it with. Good guy, and the price is right. If I want it returned fast, it would cost a couple hundred bucks. I can wait.
       

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    26. rocket 5979

      rocket 5979 Resident Gearhead

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      Depending on if he is stripping the old grey epoxy coating off it should only cost in the $50 range for powdercoat and $25-$40 for the stripping. That is USD so maybe the USD to CAN conversion is getting me here. But a few hundred for coating such a small item is high, even for expedited service.
       

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