ok! iv finished machining (up to the point it can run) iv been on it about 8 hours and cant get it to start or even kick. the way iv set the exhaust up is by putting the piston a bdc and the cam will push the valve open as the piston goes up, the timing iv been trying betwheen 15-5 degrees btdc. can anyone help me with this?
my tiny ic
- Thread starter oneKone
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Help Support Home Model Engine Machinist Forum:
Not knowing the cam specs it is hard to say but you could try this.
Take the lobe separation of the cam (110 is typical) and set your exhaust lobe to be fully open at 110 crank degrees before TDC. As a check your intake should be fully open at 110 after TDC. Continue rotating around to the next TDC and that will be the start of the power stroke.
I usually try 25 degrees before TDC for ignition timing.
Take the lobe separation of the cam (110 is typical) and set your exhaust lobe to be fully open at 110 crank degrees before TDC. As a check your intake should be fully open at 110 after TDC. Continue rotating around to the next TDC and that will be the start of the power stroke.
I usually try 25 degrees before TDC for ignition timing.
AussieJimG
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Hi Chris,
I have just come across this thread and have read it all with delight.
I have had a couple of tries to make this engine and now have an impressive collection of heads that Gus might like as sinkers.
Your version of the engine is impressive and I envy you the use of machine tools. I think your boss is also lucky to have an enthusiastic machinist.
In regard to ignition circuits, this one of Jan Ridders might be of interest: http://www.ridders.nu/Webpaginas/pagina_blokker_vonkcircuit/blokker_circuit_frametekst_engels.htm
I will follow this build to the end perhaps be inspired to have another go.
Regards
Jim
I have just come across this thread and have read it all with delight.
I have had a couple of tries to make this engine and now have an impressive collection of heads that Gus might like as sinkers.
Your version of the engine is impressive and I envy you the use of machine tools. I think your boss is also lucky to have an enthusiastic machinist.
In regard to ignition circuits, this one of Jan Ridders might be of interest: http://www.ridders.nu/Webpaginas/pagina_blokker_vonkcircuit/blokker_circuit_frametekst_engels.htm
I will follow this build to the end perhaps be inspired to have another go.
Regards
Jim
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Hi Jim,
Thanks. Will drive over to pickup the sinkers when I visit my daughter in Glenhuntly,Melbourne.
Fishing hit a bad luck. Biggies came but all went for cover into the coral snacks and refused to come for Dinner(be my dinner).
Took little girl and dad out. She was bored.So gave her a handline and hooked a few fish for her to haul up. Left her alone and she brought up a
1 1/2 lb Grouper and made her dad proud of her.
Her proud dad caught no fish.:hDe:
Cheers for the link jim, I have completed the motor enough to run it but I'm having troubles starting it. I haven't worked on it in the past 2 weeks so ill try again to get it running.
The reason for moving slower on the build is because iv gotten a new rc plane so most of my attention is focused in that and fixing other planes in my "fleet"
Ill post a picture if my engine tonight when I get home from work.
Cheers,
Chris
The reason for moving slower on the build is because iv gotten a new rc plane so most of my attention is focused in that and fixing other planes in my "fleet"
Ill post a picture if my engine tonight when I get home from work.
Cheers,
Chris
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Hi Chris,
Please excuse Gussy for gatecrashing into your thread. Will take Chris out in my boat when he drops by Singapore.
You can helm the boat. We have GPS.FishFinder and AutoPilot.So helming will be easy.
Plan to collect sinkers from Jim when I come visiting Ozz.
See you.Mate.
See you.
Please excuse Gussy for gatecrashing into your thread. Will take Chris out in my boat when he drops by Singapore.
You can helm the boat. We have GPS.FishFinder and AutoPilot.So helming will be easy.
Plan to collect sinkers from Jim when I come visiting Ozz.
See you.Mate.
See you.
AussieJimG
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Sinkers are waiting for you Gus.
Thanks for the offer Chris but I have put the project to one side for a while. I might convert it to a two stroke and perhaps copy some of your ideas for the general shape. I like your vertical air cooled model.
Keep up the good work, you are doing great.
Jim
Thanks for the offer Chris but I have put the project to one side for a while. I might convert it to a two stroke and perhaps copy some of your ideas for the general shape. I like your vertical air cooled model.
Keep up the good work, you are doing great.
Jim
OK so here's the engine completed enough to run:
i have tried so long to get it running. im on my revision 3 spark plug (which is now ok) and iv re-re-re-lapped my valves:
now after some time im getting pops by hand flicking it. i think my compression may be too high and my intake valve spring too "weak" so im going to modify these hopefully this weekend.
get it started!!!
i added the prop because i thought my flywheel may be to small, it has helped it but i think it may be the compression. im getting closer....
i have tried so long to get it running. im on my revision 3 spark plug (which is now ok) and iv re-re-re-lapped my valves:
now after some time im getting pops by hand flicking it. i think my compression may be too high and my intake valve spring too "weak" so im going to modify these hopefully this weekend.
get it started!!!
i added the prop because i thought my flywheel may be to small, it has helped it but i think it may be the compression. im getting closer....
ITS RUNNING!!!!! it took a while but its finally there. as i type im rebuilding it to clean it up so im very happy..
link:
http://www.youtube.com/watch?v=aN6sZVzUXnU&feature=youtu.be
link:
http://www.youtube.com/watch?v=aN6sZVzUXnU&feature=youtu.be
Cogsy
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Congrats! Sounds like it runs nicely, especially without a carb.
Congratulations on a runner. That's really wild, running it with the propane bottle directed toward the intake. I had never seen that done before.---Brian
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Congrats!!!! Chris.You got it going.:bow:
As for Gus,its no fishing today due to dead slow tidal current.Will start n finish con-rod today.
As for Gus,its no fishing today due to dead slow tidal current.Will start n finish con-rod today.
AussieJimG
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A great job Chris, congratulations.
Jim
Jim
cheers all,
iv got it running on a fuel vapour carb for now, i can hand flick start it so im pretty happy. im going to make something like a jan ridders vapour setup. so far iv cutr my knee 4 times, thomb twice, fingers heaps of times on that bloody prop!
iv got it running on a fuel vapour carb for now, i can hand flick start it so im pretty happy. im going to make something like a jan ridders vapour setup. so far iv cutr my knee 4 times, thomb twice, fingers heaps of times on that bloody prop!
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Hi Chris.
Those kind of injuries were very common with the props.Please take care.
Some of my high school aeromodelling classmates had it worse. One lost a finger.
Gus had it worse,I breathed in too much of the model engine fuel and ended up in hospital with very severe "Mechanical Pnuemonia" which I found out in medical books in later years. This was in 1961 when manufacturers would add in dangerous chemicals into aeromodel engine fuel for easy starting and maximise engine power.There was no health warning on the fumes.
You have to start you beauty wit a Chicken stick!!! Or with a rubber finger protector!!! I have some model diesel engines in my collection they hit you harder back then you can flip the prop. I have a 3.5cc Webra tuned engine on diesel....I'am really scared of that engine,just looking at that give me chiken flesh.
A good tip from me is.......NEVER or NEVER choke it too much. When this ignites you have a lot of energy!!! Or the motor will broke , or you will have some cuts.
Please be carefull!!
Barry
A good tip from me is.......NEVER or NEVER choke it too much. When this ignites you have a lot of energy!!! Or the motor will broke , or you will have some cuts.
Please be carefull!!
Barry
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