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Hi I am still waiting.

Thanks for the very good informative pictures, no I have not seen them before. Thats the road I will be going down I should have thought of it myself but I suppose I was looking for the easy way out. Thanks again Bob

Would you like to share the information, bearing in mind that I am in the UK.

OK chaps I am now on the last stretch of building my 1/4 scale Cirrus, which is the carburettor. The drawings for the spray bar show a .005" thick slit in it. What have other builder done to achieve this, is it possible to get a slitting saw that size. Or could I drill a row of holes, which...

Its been a busy few weeks turning up the head bolts from the solid. Made them to my measurements from the engine as no drawings. The only thing different from the write up in SIC was the Allen key heads. I have a load of 5mm grub screws in my box so I drilled and taped 5mm and screwed the...

Thanks for the replies and good comments, work still progressing making the head bolts now. I got the castings from the USA a few years ago don't know if they are still available , defenatly not in the UK. I will keep progress reports coming.

Hi I have been working on a Cirrus this year and the progress is as the photos. Completed the cylinder head a few days ago, very pleased with the out come. Sorry about the pictures being 90 deg out.

Hello all I am building a Cirrus 1/4 scale as per Zimmerman design and using SIC drawings. I have built all the bottom end including cylinders and pistons and my next task is the oil pump and distributor, followed by the heads. As it is all complete to this stage and I like turning it over by...

Hi Guys I have started to build the 1/4 Cirrus aero engine as per the Zimmerman design. To date everything is going as planed, I am now at the crankshaft stage. Which calls for some chrome moly steel 4140, well I have hunted and cannot find any. So I have decided to fabricate from silver steel...

Lovely little engine ticks over real fine.

Hi I have made and use a small centrifugal pump on one of my engines to circulate water around the block. Nothing fancy is needed, straight blades in a well fitting housing and it works a treat. All fabricated out of brass and soft soldered together, then carefully turned to fit the housing...

Dougie, thanks for your input I am now using Hall sensors 451s ogl as supplied by Minimag in the Isle of Wight. The problem has now gone, phew had my head spinning for a moment. Thanks again for your helpful input. Regards Bob

Now thats a thought, have you contact detail for the replacement sensors you used. The ones I am using are 3144 441.

Yep all wired as you say plus the extra ground wire. See the diagram I have uploaded.

Here is the circuit, I believe its a grounding problem but what. It works on my other engines.

Hi all I have completed a Hoglet fitted with single Hall sensor that is triggered by two magnets, and using the lost spark system. The Hogletl is as per the drawings and the gear to which the magnets are fitted is of brass. My problem is I can turn the engine over by hand to set the timing etc...

Cut the cams this weekend had to make a quick fixture to fit it onto my rotary table. Then a practice first before the main event. Pleased with the result. Here are some pictures of cutting the cam and with it fitted along with the rest of the cam bits.

That all looks very nice good job.

Thanks for the suggestion will try it next time. Just to be clear what icon should I click on?

Nice looking engine