Page 4 of 38 FirstFirst 12345678910111213141516171819202122232425262728 ... LastLast
Results 31 to 40 of 371

Thread: Johnson "70mod"

  1. #31
    Team Member hupiveneilija's Avatar
    Join Date
    Oct 2014
    Location
    Finland
    Posts
    263
    Post Thanks / Like

    Default

    Back together! Waiting for going back to the boat and startup. Have some work with the boat because transom has been done completely new and also have to blueprint the hull.

    Has anybody tried those newer 70hp carbs with black plastic top? Are they worth nothing compairing to the older version?
    Also went older pack with appropriate stator. Should be unlimited.
    Really exited to see how it works, or dont😬.
    Attached Images Attached Images   

  2. #32
    Banned
    Join Date
    Nov 2016
    Posts
    289
    Post Thanks / Like

    Default

    Be interesting to see if it goes with that cylinder head, from the tiny size of combustion area it looks very strange .

    have checked to see how many cc it is ? and what is the cranking compression now ?

    will you run the engine on the stand for a while before putting on boat to run it in nice and slowly ?

  3. #33
    Team Member hupiveneilija's Avatar
    Join Date
    Oct 2014
    Location
    Finland
    Posts
    263
    Post Thanks / Like

    Default

    That is the boat where the 70mod is going to.
    Attached Images Attached Images   

  4. #34
    Banned
    Join Date
    Nov 2016
    Posts
    289
    Post Thanks / Like

    Default

    that should be good for about 50 to 52mph with your mod engine. at around 6500 rpm with a good 23 pitch prop.

    what make is the jack plate ? or did you make that yourself ?
    i have never seen one the same as that before.. looks realy good.

    the boat looks familiar, pretty sure i have seen these in the uk too, they look nice and sharp, plenty of rails so should be good in the rough stuff.

    looks like its going to be a real good offshore racer, plus looks good even in the garage.

  5. #35
    Team Member zul8tr's Avatar
    Join Date
    Oct 2008
    Posts
    511
    Post Thanks / Like

    Default

    If you had a pad on that deep Vee it would run faster and be more stable (minimal lateral rocking) at speed. The right pad dimensions will reduce water drag. The pad would require a higher engine set since to do it would remove some of the bottom Vee.

    Details here on why a pad:

    http://www.aeromarineresearch.com/pu...B_jun2011.html

    complete article available from Jim Russell see lower left of article.
    " Three may keep a secret if two of them are dead" Ben Franklin
    " ------- well Doctor what have we got a Republic or Monarchy? A Republic he replies if you can keep it"
    Benjamin Franklin, 1787 Constitutional Convention, as recorded by signer James McHenry's in his diary at the Library of Congress

    Location: SW Orlando, Fl
    Likes hydroyt, Jimboat liked this post

  6. #36
    Team Member hupiveneilija's Avatar
    Join Date
    Oct 2014
    Location
    Finland
    Posts
    263
    Post Thanks / Like

    Default

    If it is that slow, then i have to put stock motor back to the boat. It went 57.5mph with it.
    Likes LittleCharger liked this post

  7. #37
    Banned
    Join Date
    Nov 2016
    Posts
    289
    Post Thanks / Like

    Default

    if you got 57mph with the boat and motor why on earth have you stripped it down ?

    what speed and rpm are you expecting to get from the boat motor combo ?
    and what size prop ?

  8. #38
    Team Member hupiveneilija's Avatar
    Join Date
    Oct 2014
    Location
    Finland
    Posts
    263
    Post Thanks / Like

    Default

    I dont know, for fun? Or maybe i want to try if i can make my motor rev higher and go faster. Go figure..
    Likes LittleCharger, Per liked this post

  9. #39
    Banned
    Join Date
    Nov 2016
    Posts
    289
    Post Thanks / Like

    Default

    is the boat an Argo 16 or Argo 15 ?

  10. #40
    Team Member hupiveneilija's Avatar
    Join Date
    Oct 2014
    Location
    Finland
    Posts
    263
    Post Thanks / Like

    Default

    Its 17. By the way, jackplate is Panther450.

Thread Information

Users Browsing this Thread

There are currently 2 users browsing this thread. (0 members and 2 guests)

Similar Threads

  1. "Hi Johnson" - Prop Master - Story
    By Tomtall in forum Propellers
    Replies: 5
    Last Post: 06-13-2011, 05:36 AM
  2. Dennis Johnson "Trafficade" Racing
    By Ron Hill in forum Boat Racing Encyclopedia
    Replies: 1
    Last Post: 11-05-2006, 07:26 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •