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Conversation Between roflhat and nort-0
Showing Visitor Messages 1 to 6 of 6
  1. nort-0
    27-06-2021 04:08 AM
    nort-0
    At the moment the hulls running pretty wet so I'm only running a 11 x 13p alloy thats been cupped with the motor up so it's just piecing the surface it'll get 56kmph but with it trimmed in to keep the stern up as soon as you trim out she falls of the bow wave and porpoises. I'm hoping with CoG sorted plus a little more hp I can run 15p stainless maybe even stretch it 17p but we'll see how we go as i don't plan reving past 5850 as it is a fishing boat

    Once again I really appreciate your information
    Thanks nort-0
  2. nort-0
    27-06-2021 04:07 AM
    nort-0
    Cheers Seumas I'll keep the possible lack of reliability from the TLDI gasket in mind when talking to the guy supplying my parts. 1mm it is then which after you mentioned it I actually looked at the compression of 50d2 which is pretty low compared to other companies so it certainly won't hurt to get closer to 130psi

    I did look at doing something with the back of the cowl which does look nice and simple so it might be a temp mod while I work on my scoop idea was looking at doing something on the front along the lines of the big old mercury racing cowls with a S bend design to separate water/dust then feed into the front of the cowl and partial block the rear inlet to hopefully create some pressure but still keep airflow through the cowl.
    Love the idea of a butterfly scoop on an outboard tricky to build but not impossible
  3. roflhat
    26-06-2021 08:50 AM
    roflhat
    I'd aim for 1mm overall, wasn't so keen on the TLDI gasket option as they don't tend to last so long seemingly. Haven't run one myself so can't say for sure.

    Another thing you can do is raise the air intake section on the cowling, put some washers in to change the angle and get more air in. Always thought it would be cool to have an intake on the cowling that opened as you twisted the throttle but maybe a bit ambitious!

    What prop are you running at the moment?
    Cheers, Seumas
  4. nort-0
    24-06-2021 07:33 AM
    nort-0
    Thanks for getting back to me I appreciate the info
    I'm only just getting back to playing with this motor now I've been playing with CoG trying to fix a handling issue not realising it was the pod someone fitted to the back having excessive setback so while I'm getting the transom rebuilt I'll try to free a few hp up. I've got some reeds and am about to order a d1 exhuast and tldi head gasket. Do you take 1mm off and run a tldi gasket or aim for 1mm over all. Good to hear the stacks will complement these mods I'm also going to have a
    go at a forward facing intake scoop for the cowl to
    get some better air pressure in there hopefully I can design some sort of water separation chamber or bend to keep it dry in there. Anyway thanks for the info I really appreciate it
    Cheers Nort-0
  5. roflhat
    07-08-2020 08:30 AM
    roflhat
    Apologies only just seen this. Stacks do make a difference, help get a bit more airflow into the engine but obviously they are less waterproof than a standard airbox. Best improvement in power is from skimming the head, the general number for a tohatsu 50d2 is 1mm, increases compression by 30psi and can still run pump unleaded. Will give you more power throughout the rev range, more torque too. If you're removing the rev limiter you want to weld the crank, then the engine is strong enough that you can really extract more power from it safely
    Cheers
  6. nort-0
    19-07-2020 08:30 AM
    nort-0
    Hi
    Looks like you know the 50hp tohatsu motors pretty well does fitting velocity stack make a difference to stock motor or do you need to start playing with powerheads to take advantage of them. Only asking as i'm looking at squeezing a little more power out of an M50d2 without killing bottom end torque as it's fitted to a 4.4m alloy fishing boat and there doesn't seem to much info around on motors fitted to heavy boats. Any info is appreciated
    Thanks nort0

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