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Hi, what email address did you use? Was it [email protected].

Hi, I was wondering if anyone here has ordered plans from cad-modelltechnik-jung Online-Shop der Fa. CAD+Modelltechnik Jung and received them. I ordered some plans on the 11th of October and have received no feed back as to the progress of the order. I have sent 3 emails inquiring if they had...

You were absolutely correct. I skimmed the head and achieved high revving two stroking. Thanks to all for all suggestions. I now have two running, two stroking engines.

Thanks. Nice observation, I must have taken it out. Its sitting on the starter battery to the left. 2 minutes in.

I didn't think I was too close when doing it, just looks like it I think.

Hi Tim, The engine was not designed with this carb . The carb is a different one from the other engine, its a Rupnow design I thought might work on this engine. I have another run video below. SecondRun

So after the first running engine ( on my fourth build) i went back to number 3 and made a new piston and laps for the bore and piston. I appear to have got it right as the engine now runs. ThirdEngine2ndRunner

Yes Revs are a bit low but as UK member f2cf1g said it is probably under compressed. I will probably skim the head as he suggested. The prop is only 8 X 6. Since I got this one to actually run I am going back to Engine number three and redo the cylinder liner and piston since I have a better...

Thanks to all the suggestions I achieved a run without glow starter. The Glow plug was 5mm from the top surface of the cylinder head so I machined 5mm off the plug recess to get it flush with the top of the cylinder head. I also purchased an OS needle valve. I replaced the plug and achieved...

Mate thanks again for your insight. Yes In my mind I did question the plug length. It is recessed into the plug hole which I thought was strange. Also the plans actual do say to just buy an OS needle and gave the part number, but since I had already made one I used it. I will try to reduce the...

Thanks Scottyp, Yes it is running rich, partly on purpose not to over rev a newly built motor but also it seems my needle and seat may not be that great. I can slowly close the needle valve down and can hear the revs increase but as I continue to close , instead of revving harder at one point it...

Hey Tim, Thanks for such a detailed response. Its Steel Sleeve , cast Iron Piston. I have run it for a total of about 25 minutes. When I was a boy (some time ago) I used 10 X 6 props on 40 size engines. This prop is an 8 x 5. It is running rich. I think the precision of my needle is not so good...

Try to figure out why it stops when glow plug power removed.

Hi, After almost a year of trying and 4 attempts at different engines I finally got one to run. This one was built from RCM&E Plans for the Whittaker Firefly 46. I finally understood the honeing process and was able to measure the taper in the bore properly. I still have issues. I cannot not...

Wow Guys, Take it easy. I appreciate your differing points of view and your offer Ken. Both of you obviously have had success in building engines and have your own techniques that work for you and that's great. I am convinced its the piston cylinder fit, so I will proceed down that path again...

Hi Ken, Thanks for the detailed responses. Firstly , when I open the needle and place a finger over the carb inlet and turn the prop fuel is definitely pulled up the fuel hose. If I close the needle valve and do the same procedure fuel will not be drawn up the hose. I know this for sure...

Hello Ken, Thanks for the detailed reply. At this stage I have gone backwards. I have made two cylinders and grown the cast iron piston several times in an attempt to get a better fit. I just kept getting the same result. I then decided to make a ringed piston. Cast iron Piston Cast Iron ring...

Hi Billitmotors. I did put the flat into the backplate as in the plans. You can hear the engine in my little video clip in this thread, sounds rich or what the guys at the model club I was in 30 years ago called four stroking. I have looked for leaks and used sealant on all surfaces. Best run is...

Hi Wob, After lapping I measured the piston in multiple locations and the measurements where all 16.021 to 16.022 mm. The piston finish appeared uniform after lapping, i.e. no spots duller or shiner than any other. I believe I machined the centre first before machining the piston to initial size...

Hi f2cf1g, I have actually "grown" the piston 3 times now and relapped as you describe. The last time, yesterday, I did it and it expanded by .06mm and did not fit the bore. I lapped it till it would go half way up the bore, then fitted it back into engine. It was hard to turn over but gradually...