Author Topic: LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.  (Read 874 times)

Offline Longboy

  • Full Member
  • ****
  • Posts: 215
LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.
« on: August 01, 2019, 05:43:17 AM »
Trying out a sideline as a plumber with my first liquid cooled model. More parts and more area needed on the frame for those parts, Black Water turned out to scale with these external additions. Don't think I will return to L.C. soon..... but gave me a chance to try out another cooling option for my industrial type model engines. BLACK WATER starts this week with an abbreviated build log!

Wadda you mean, "It don't run"???

Offline Longboy

  • Full Member
  • ****
  • Posts: 215
Re: LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.
« Reply #1 on: August 02, 2019, 07:08:37 AM »
Not sure of how much water jacket I would need, the area between the outer wall of cylinder liner and inside wall of the water jacket. That was determined by bringing home some 2in. galvanized water pipe and using my DOM stock for a 1.25in. bore. Gave me about .312in. spread between cylinder liner and jacket. Looks good.



Aluminum end caps bored for the liner clamp the jacket. Grooved recess with RTV and a pair of socket head #6 screws seals up the perimeter wall.

Wadda you mean, "It don't run"???

Offline Longboy

  • Full Member
  • ****
  • Posts: 215
Re: LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.
« Reply #2 on: August 04, 2019, 09:44:33 PM »
The cyl. liner drops in.



The gap in the bottom end cap takes the epoxy to lock the cylinder with the cap. two 4-40 socket heads hold the assembly to the deck. The top side cap, there is no adhesive. The cyl. liner slips through.



The cylinder head bolts to the top cap and the o-ring is the water and combustion seal then.



The socket heads that draw the end caps to the water jacket are not sealed under the cyl. head to provide fill overflow or steam relief. There are no water passageways in the heads.

Wadda you mean, "It don't run"???

Offline Longboy

  • Full Member
  • ****
  • Posts: 215
Re: LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.
« Reply #3 on: August 06, 2019, 03:10:32 AM »
Cylinders mounted. The deck extended for items to support the cooling.



Net weight of this engine increasing with the cast iron jackets and long deck.

Wadda you mean, "It don't run"???

Offline Longboy

  • Full Member
  • ****
  • Posts: 215
Re: LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.
« Reply #4 on: August 06, 2019, 11:31:12 PM »
Going to need a water pump. I made this vane pump using a block of Delrin. It is a mag drive unit. I also bought an electric gear pump as a choice too.



This tested out pretty good running on the lathe with a water flow loop. The magnets didn't start to slip till after 2500 RPM. Good enough for an engine that idles away. The vane drum is 1 inch dia. and the cavity in the block is 1.25 inch.



The issue is it's size in scale to BLACK WATER. Even after trimming off the block to a square, I was going to have packaging issues in mounting.



Save for the next liquid cooled engine I may never build, the exercise was worth doing and can be used as an accessory driven by any engine to pump water to show work.



The electric gets a spot on Black Water.  :ThumbsUp:
Wadda you mean, "It don't run"???

Offline b.lindsey

  • Global Moderator
  • Full Member
  • *****
  • Posts: 13744
  • Dallas, NC, USA
    • Workbench-Miniatures
Re: LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.
« Reply #5 on: August 08, 2019, 01:00:20 PM »
Nice  looking mag driven pump even if you don't use it on this build  :ThumbsUp:

Bill

Offline Longboy

  • Full Member
  • ****
  • Posts: 215
Re: LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.
« Reply #6 on: August 08, 2019, 10:39:18 PM »
The crankshaft has a 2 bearing support with a dummy web between the rods. That segment is 3 piece, steel rounds bridged with aluminum tube. This was changed out as my crank webs were slipping on the throw pins and at fast idle or just starting a reluctant engine put the flywheel into a wobble.



That piece was near 12 oz. and the distance between the bearings in the end plates and the web load on the throw pin too great, being my longest crankshaft between the end plates twin cyl engine. BLACK WATER should be a 3 bearing engine. Lets see if I can lighten the load on the throw and get by on 2 bearings. Third bearing always an option.....



A couple of rolls of electrical tape.........just kidding.  :Lol: A pair of aluminum dummy webs weigh 5 oz. total on the throw pin. The set screws with adhesive hold everything on the end to end throw pin. I took another 3 oz. outta the flywheel and dished the pistons for a lower compression for ease of starting. With the engine running, the throw pin disappears in a blur and it looks like nothing supporting the crank between the con rods then. I don't know if this light weight technique will hold up yet. :shrug:
« Last Edit: August 08, 2019, 10:45:41 PM by Longboy »
Wadda you mean, "It don't run"???

Offline Longboy

  • Full Member
  • ****
  • Posts: 215
Re: LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.
« Reply #7 on: August 09, 2019, 06:15:28 PM »
Center punch a good way to locate an idler gear for the timing set.



If I get "slightly" off, the shaft for the idler can be drilled a few thousands eccentric off center or even just oversize the hole through the hub to its bolt and snug it up to an even gear lash with the timing set.



The lobes for the cam on BLACK WATER are unique, something I've haven't seen this material used for. Made from half inch dia. Delrin, they are easier than metal to cut & file on the profile. Low heat on the camshaft as well as low spring pressure and no need to lube, I think they will last well on slow RPM gas engines. They make a distinctive "clickety-clack" against the lifters you can hear on startup and running in the video!

Wadda you mean, "It don't run"???

Offline Longboy

  • Full Member
  • ****
  • Posts: 215
Re: LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.
« Reply #8 on: August 10, 2019, 06:13:58 PM »
Engine finished minus its cooling system and initial start-up with the fruit jar vapor induction. At this point not running or running poorly for seconds. Crankshaft issues the main culprit. Continue with the cooling system from here.





The light weight webs on the throw pin from previous posting still not enough to overcome the distance between bearings to keep the ends of the crankshaft straight and parallel. A center bearing will be going in now.



Wadda you mean, "It don't run"???

Offline Longboy

  • Full Member
  • ****
  • Posts: 215
Re: LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.
« Reply #9 on: August 11, 2019, 07:41:10 AM »
Hi/low flow fittings in side of the jackets. Aluminum blocks for the gravity return flow to radiator and some basic 5/32 in. brass tubing with home grown #10-32 fittings fed by the pump. I managed to get the tubing to bend this short radius without collapsing.



A 2 inch dia. fan pulls through the radiator.




Three point mounting brackets for the radiator to front of frame.



The fan on the nose of the crankshaft turning 1200 RPM is not going to move too much air. Giving it some help with a shroud.



A slice off a 16 oz. acrylic tumbler from the dollar store going to work here.



It will help some........and mounted to the engine.

« Last Edit: August 11, 2019, 07:45:56 AM by Longboy »
Wadda you mean, "It don't run"???

Offline Longboy

  • Full Member
  • ****
  • Posts: 215
Re: LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.
« Reply #10 on: August 12, 2019, 07:17:21 PM »
The water pump active using a 6V penlight battery pak. This was a fall back option as I didn't have a can motor driven as generator by belt drive with enough omph to get the pump running. Not sure at this point if pump needs to run constant or periodically or if hot water affects its lifespan in demonstrations.



The Delrin fill manifold on top of deck has a nipple under red cap to load the coolant. Same level as top of jacket.



This concludes the build log of BLACK WATER.




TOMORROW!   :pinkelephant:
Wadda you mean, "It don't run"???

Offline b.lindsey

  • Global Moderator
  • Full Member
  • *****
  • Posts: 13744
  • Dallas, NC, USA
    • Workbench-Miniatures
Re: LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.
« Reply #11 on: August 12, 2019, 10:45:49 PM »
Any chance of a video?

Bill

Offline Longboy

  • Full Member
  • ****
  • Posts: 215
Re: LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.
« Reply #12 on: August 14, 2019, 01:09:05 AM »
WELCOME TO LONGBOY'S "BLACK WATER NOW" PRESENTATION!



1.25IN. BORE/ 1.125IN. STROKE--------45CC'S.



WORK BEGAN ON BLACK WATER WEEK BEFORE CHRISTMAS.



AND COMPLETED END OF APRIL.



MY LARGEST TWIN ENGINE BY OVERALL SIZE.
WEIGHT: 14 LBS.



FEATURING PLASTIC CAMSHAFT LOBES. (DELRIN)



AND WATER COOLING.

  :popcorn:  ENJOY! DAVE.




Wadda you mean, "It don't run"???

Offline b.lindsey

  • Global Moderator
  • Full Member
  • *****
  • Posts: 13744
  • Dallas, NC, USA
    • Workbench-Miniatures
Re: LONGBOY'S "BLACK WATER" MODEL GAS ENGINE.
« Reply #13 on: August 14, 2019, 12:36:27 PM »
Certainly is a smooth runner Dave. Thanks for the final pics and video!!   :ThumbsUp: :ThumbsUp:

Bill