Page 205 of 205 FirstFirst ... 105155195203204205
Results 3,061 to 3,067 of 3067

Thread: Oddball engines and prototypes

  1. #3061
    Join Date
    20th January 2010 - 14:41
    Bike
    husaberg
    Location
    The Wild Wild West
    Posts
    10,461
    Quote Originally Posted by WilDun View Post
    KATINAS,
    In the photos of your "Ryger" type engine (which I seem to have lost), the 'crosshead?/gudgeon pin holder'? appears to be retained by being threaded into the narrow part of the piston?
    Am I correct?
    Will to see any picture a user has posted click on their user name and view attachments by user
    Click image for larger version. 

Name:	view attachments by user.JPG 
Views:	11 
Size:	149.0 KB 
ID:	347143
    Quote Originally Posted by Katman View Post
    I reminder distinctly .




    Kinky is using a feather. Perverted is using the whole chicken

  2. #3062
    Join Date
    7th October 2015 - 07:49
    Bike
    honda ns 400
    Location
    Lithuania
    Posts
    379
    WilDun, alloy part with piston pin is threaded into the steel tube. Tube wall thickness 1.3 mm.
    All this complicated piston construction, with small fixing bolt inside, is designed only to make engine as compact as possible, but at the same time maintaining a longer thrust for smaller piston part at TDC (28 mm in my case ) and not to let piston pin hole to clash with lower cylinder seal as masked gudgeon pin is higher than seal at TDC.
    So with 50.6 mm stroke, the minimum height of additional plate under the cylinder, that I could do, was 20 mm.
    But after every test threaded part little lose, so it s not a good solution. Maybe longer height of that threaded small part could help, but fixing still needed.
    Perhaps better chose solid piston with thin steel liner (I even already have it made from a tractor piston pin 38 mm dia. x 0.9 mm thick) and open hole for piston pin from one side, with normal circlip. Of course this add another 8-10 mm to plate so cylinder must be rise from 20 mm to 30 mm.
    On Ryger pistons they use special key for pin from one side, but they still must use two bolts to fix it. Narrower part of Ryger piston was coated.

  3. #3063
    Join Date
    10th February 2005 - 20:25
    Bike
    1944 RE 1
    Location
    Auckland, New Zealand.
    Posts
    2,198
    Quote Originally Posted by katinas View Post
    WilDun, alloy part with piston pin is threaded into the steel tube. ..................

    On Ryger pistons they use special key for pin from one side, but they still must use two bolts to fix it. Narrower part of Ryger piston was coated.
    Tapered thread? ..... or threads with slightly different pitch?

    ...............................................

    Thanks HUSA, - why the hell didn't I think of that??
    Strokers Galore!

  4. #3064
    Join Date
    7th October 2015 - 07:49
    Bike
    honda ns 400
    Location
    Lithuania
    Posts
    379
    The biggest downside of threaded joint, is that after two or three heat cycles, thread tightening between steel and aluminium changed, but piston exhaust side skirt must be fixed always at the same position. Higher accurate could be with bigger thread pitch, but this add more weight and less space.
    But yes, tapered thread with side fixing screw, could be a good option without too much complications and helps to save 10 mm in height. Thanks WilDun.

    Not in theme. I hadn’t been interested in things like torpedoes at all before, but I found this. Four con rods on one crank pin.
    And good example of scaled "Rounded piston theme" with sharp edge at C, although the purpose is different

    https://hmvf.co.uk/topic/39632-8-cyl...e-restoration/
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Tapered.jpg 
Views:	34 
Size:	769.3 KB 
ID:	347242   Click image for larger version. 

Name:	SBrown-20190401-0009.thumb.jpg.d59f0d7f732a89f8100afea1fcc8d0ad.jpg 
Views:	27 
Size:	171.9 KB 
ID:	347243   Click image for larger version. 

Name:	SBrown-20190310-0012.jpg.8061b1514a49e218bb8e6d2ffe8ea85f.jpg 
Views:	27 
Size:	125.5 KB 
ID:	347244   Click image for larger version. 

Name:	Four conrod.jpg 
Views:	27 
Size:	117.1 KB 
ID:	347245   Click image for larger version. 

Name:	SBrown-20190310-0010.jpg.998174461addefe2e691232306066dae.jpg 
Views:	23 
Size:	107.0 KB 
ID:	347246   Click image for larger version. 

Name:	SBrown-20190404-0005-2.jpg.f5aae271773939a50e29ac90dd224f4b.jpg 
Views:	22 
Size:	114.5 KB 
ID:	347247  

  5. #3065
    Join Date
    10th February 2005 - 20:25
    Bike
    1944 RE 1
    Location
    Auckland, New Zealand.
    Posts
    2,198
    Quote Originally Posted by katinas View Post
    The biggest downside of threaded joint, is that after two or three heat cycles, thread tightening between steel and aluminium changed,.......................................... .................................................. ........
    I was thinking since I suggested that as a solution - when a taper is used in that situation it may tend to expand the tube and maybe not such a good idea after all .......I do still believe that two very slightly different thread pitches might work ( so long as they could be made to lock up at exactly the right place!).

    Torpedo motors look very interesting too, (even though I don't know exactly how they work!). I believe the Germans made a very tidy little V8 fourstroke engine for their torpedoes (I may find a pic later) - pity it was made to be blown up! -

    Who wants wars? - but then all leaders want to be great (and at the expense of others!). - the military men want to play with their new weapons even if it means sacrificing beautiful engines !!
    Strokers Galore!

  6. #3066
    Join Date
    7th October 2015 - 07:49
    Bike
    honda ns 400
    Location
    Lithuania
    Posts
    379
    This is V8 Junkers Jumo K8 engine with head disc valves. PDF format in first post https://ww2aircraft.net/forum/thread...o-engine.7556/

    Yes WillDun, passenger liners Goya, Steuben and Wilhelm Gustloff, mostly with civilian refugees on board, one of the most terrible attack that soviets done with five or six torpedos at the nearly end of War. 20 000 deaths.
    And nothing changed, they will do the same now in Belarus with own people, just now days internet not let them go too far.

    In 1940 Stalin had all the latest German military equipment. Hitler gave away to soviets a few of the latest planes, tanks, ships (torpedo) for testing and for study, as Stalin abandoned some of the territories that were included in the Ribbentrop Molotov Pact.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	KM8 torpedo a.gif 
Views:	33 
Size:	35.8 KB 
ID:	347253   Click image for larger version. 

Name:	KM8 torpedo 2a.gif 
Views:	34 
Size:	47.0 KB 
ID:	347254   Click image for larger version. 

Name:	EDqmSxeWkAEz5aa.jpg 
Views:	32 
Size:	580.6 KB 
ID:	347255   Click image for larger version. 

Name:	new-torp-1221x2048.jpg 
Views:	26 
Size:	482.0 KB 
ID:	347256   Click image for larger version. 

Name:	img7668.jpg 
Views:	28 
Size:	40.4 KB 
ID:	347257   Click image for larger version. 

Name:	Torpedo_Engine.jpg 
Views:	27 
Size:	104.6 KB 
ID:	347258  

  7. #3067
    Join Date
    10th February 2005 - 20:25
    Bike
    1944 RE 1
    Location
    Auckland, New Zealand.
    Posts
    2,198
    Quote Originally Posted by katinas View Post
    This is V8 Junkers Jumo K8 engine with head disc valves. PDF format in first post .................................................. ..................................
    In 1940 Stalin had all the latest German military equipment. Hitler gave away to soviets a few of the latest planes, tanks, ships (torpedo) for testing and for study, as Stalin abandoned some of the territories that were included in the Ribbentrop Molotov Pact.
    Yes that V8 is the one I was meaning - very interesting!

    War to me is obscene and the only interest I have in it came from the fact that I was born in the last years of WW2 (I must admit I do find the technology fascinating though, especially the aircraft stuff),
    So I was more or less interested by things like two Bristol (sleeve valve??) radial engines from a crashed wartime Wellington bomber which had been hanging from a high cliff for years and was eventually taken down and sent to the local scrapyard, which I visited regularly (on the way home from school, around 1957) - just to check that they were ok!. - but eventually they were taken away and no doubt got melted down, just like all the rest of the precious wartime machinery!
    Strokers Galore!

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

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