408 wet v dry sump tranny | FerrariChat
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408 wet v dry sump tranny

Discussion in 'Technical Q&A' started by Andy Illes, Jun 16, 2005.

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  1. Andy Illes

    Andy Illes Rookie

    Jan 16, 2004
    5
    #1 Andy Illes, Jun 16, 2005
    I've gotten a bunch of questions about the dry-sump transmissions I have in FerrariAds.... specifically, whether a dry-sump tranny will work with a wet-sump block, and vice versa.

    The dry-sump engine's pressure pump is in front, below the cam-drives, and its chain-drive sprocket attachment nut requires a clearance the wet-sump tranny is not factory machined to provide. The dry-sump tranny has thicker sections for a stronger bottom-end, but other than that, they are identical, so except for the clearance, they are interchangeable A dry sump tranny will mate perfectly to a wet-sump block without alteration, using the same gaskets. All the oil connections are to the block, so this is not an issue.

    Conversely however, to fit a dry-sump engine to a wet-sump tranny requires minor machining in the tranny casting for clearance. There is fortunately plenty of metal, and only a small amount of needs be removed. Don McCormick (Dandy Don) had his (wet-sump) tranny sent out for this mod to fit the dry-sump engine I built for him (see his pics), but it's a minor Dremel project, in my opinon.

    Hope this answers the questions... best regards to all.
     
  2. Dandy_Don

    Dandy_Don Karting

    Dec 8, 2003
    102
    The Woodlands TX
    Full Name:
    Don McCormick
    #2 Dandy_Don, Jun 16, 2005
    While the wet sump tranny will fit on a dry sump engine, modification of the wet sump tranny is required- it is not a Dremel tool modification as Andy suggests- one of the studs in the dry sump engine block (at the forward pressure pump location) is offset out to accomodate the oil pump drive sprocket and does not line up with the hole in the flange of the wet sump tranny which is not offset (wet sump does not have the offset because it has no drive sproket there). Additionally the case itself had to be slightly extended to allow the nut on the drive sprocket to fit I had to have a larger flange created on the wet sump tranny to accomodate the location of the offset stud . As all of the parts are aluminum heli-arc or TIG welding is requred. Going the other way, Andy's dry sump tranny should not need the case extension but its flange will need modification to allow the non offset stud of a wet sump engine to line up and the case will need to modified slightly to allow the nut to fit on the stud. All in all not as difficult as what I had done but I am pretty sure that this is not a Dremel tool modification- a good shop could probably do the work for $100-$150- I think mine was about $250 but it was definitely more work. Other than this I am fairly certain Andy's dry sump tranny will fit a wet sump engine.
     
  3. Gary48

    Gary48 Guest

    Dec 30, 2003
    940
    #3 Gary48, Jun 16, 2005
    I guess maybe that I am a bit confused about the terminology "dry sump trany). Unless there is a transmission (trany) in which the gears do not run in a gear lube bath and are pressure lubricated. More accurately maybe you are talking about a dry sump lubrication in which the crankcase is kept evacuated and the oil stored in a oil tank, if this is the case, there is a very good thread of a 308 already converted to a dry sump oiling system. This was a very nice conversion and worthy of your study. Check "search" at the top of any thread and type in Dry sump, it shoud lead you in the right direction. I hope this is helpful

    Gary
     

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