Project: Break in Dutch machine
#286
Tech Adept
Joined: Oct 2019
Posts: 193
From: Limassol
All is already discussed in this topic.
The rod movement sliding over the crank pin is limited by the amount of space it has in the piston. With the straight up position there is gravity that can move the rod by 2 or 3mm but with the ebis due the forces it is also possible that the rod is sliding over the crankpin within the limits. I have seen a stand up setup where no backplate was used and it worked. But I like to stay it put on the pin with max position so I made an adjustable backplate. If you have an old broken engine backplate you can drill an hole in the middle and use it. The hole is needed so no compression lock under the piston will happen.
The rod movement sliding over the crank pin is limited by the amount of space it has in the piston. With the straight up position there is gravity that can move the rod by 2 or 3mm but with the ebis due the forces it is also possible that the rod is sliding over the crankpin within the limits. I have seen a stand up setup where no backplate was used and it worked. But I like to stay it put on the pin with max position so I made an adjustable backplate. If you have an old broken engine backplate you can drill an hole in the middle and use it. The hole is needed so no compression lock under the piston will happen.
My only other option would be the drilled backplate which let the engibe sit on the mounts without a problem.
On some of my engines that are not bumpstart but rotostart that I want to break in on the machine the backplate will not let the engine sit on the engine mount.
So with those I will have to break the in without anything holding the conrod.
I tried them upside down but the conrod does not move completely out of the crank, just some mm.
My concern is if the conrod will deform because of moving sone mm out of the crank pin or rub against the crankcase while breaking in.
#289
Tech Fanatic
Joined: Apr 2007
Posts: 825
From: Overseas
Thanks to Roelof I completed my oil break in machine. I will probably make some small minor revisions, but all in all works perfectly. When I say revision , a smaller tank so it heats up quicker. Mine takes 1.5 hours to get to 98C, once it is at temp it good to go as your only lowering it from there.


#290
Joined: Aug 2002
Posts: 6,296
From: Oxnard, CA
Thanks to Roelof I completed my oil break in machine. I will probably make some small minor revisions, but all in all works perfectly. When I say revision , a smaller tank so it heats up quicker. Mine takes 1.5 hours to get to 98C, once it is at temp it good to go as your only lowering it from there.


#292
Joined: Aug 2002
Posts: 6,296
From: Oxnard, CA
#295
It is just a combination of too much bath volume and a too small heating surface volume.
From the start I had the idea to mount the heaters on the engine. That will bring the engine directly on temperature and the volume of the engine helps to spead the heat much better.
From the start I had the idea to mount the heaters on the engine. That will bring the engine directly on temperature and the volume of the engine helps to spead the heat much better.
#296
Joined: Aug 2002
Posts: 6,296
From: Oxnard, CA
I have mine mounted close to the exhausts side of the motor.
#297
Tech Fanatic
Joined: Apr 2007
Posts: 825
From: Overseas
Since I don't really have access to a machine shop I couldn't make a device that would allow me to mount my heaters to either the motor or make a full metal engine mount with the heaters mounted on it. The best I can do is find some metal heatsinks and find a way to attach the heaters to that to increase the surface area. My design is purely acrylic based with aluminum motor mounts with a 3d printed exoskeleton. It's the best I could do with what is accessable. Like I said once it warms up I am good to go from there, but it does take over an hour to reach max temp of 99c. I will try to get the heaters mounted onto a heatsink as that will still allow me to keep my current design and won't compromise my top cover.
Yes I am curious what wattage heaters your using. 20 minutes is very fast.
Mine takes just over 1 liter of oil. Around 1.3 liters to fill the box up to the top of the carb hole. System works perfectly, other than the long warm up time. If I can get that down to 30 to 45 minutes I would be satisfied.
Yes I am curious what wattage heaters your using. 20 minutes is very fast.
Mine takes just over 1 liter of oil. Around 1.3 liters to fill the box up to the top of the carb hole. System works perfectly, other than the long warm up time. If I can get that down to 30 to 45 minutes I would be satisfied.
#298
Joined: Aug 2002
Posts: 6,296
From: Oxnard, CA
Since I don't really have access to a machine shop I couldn't make a device that would allow me to mount my heaters to either the motor or make a full metal engine mount with the heaters mounted on it. The best I can do is find some metal heatsinks and find a way to attach the heaters to that to increase the surface area. My design is purely acrylic based with aluminum motor mounts with a 3d printed exoskeleton. It's the best I could do with what is accessable. Like I said once it warms up I am good to go from there, but it does take over an hour to reach max temp of 99c. I will try to get the heaters mounted onto a heatsink as that will still allow me to keep my current design and won't compromise my top cover.
Yes I am curious what wattage heaters your using. 20 minutes is very fast.
Mine takes just over 1 liter of oil. Around 1.3 liters to fill the box up to the top of the carb hole. System works perfectly, other than the long warm up time. If I can get that down to 30 to 45 minutes I would be satisfied.
Yes I am curious what wattage heaters your using. 20 minutes is very fast.
Mine takes just over 1 liter of oil. Around 1.3 liters to fill the box up to the top of the carb hole. System works perfectly, other than the long warm up time. If I can get that down to 30 to 45 minutes I would be satisfied.
thats what I use
#299
Tech Fanatic
Joined: Apr 2007
Posts: 825
From: Overseas
That explains it. I am total of 80w only and mine is completely based on 12v system. I just purchased the heatsinks so going to give that a try, if not I can increase my wattage. How many of those 250w are you running?
#300
Joined: Aug 2002
Posts: 6,296
From: Oxnard, CA
I'm only running 2. One each side of the motor, mounted at about the center of the sleeve bore. I don't really know the temperature at the front of the motor, as I have the 2 temp sensors punted next to the heating elements. Ive been using a 30 amp power supply



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