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as mentioned the vac on overun opens the valve against spring pressure, ive made several in the past. The important thing to remember is to keep the dia of the "seal" where the piston meets the neck on the boost side smaller than the piston dia, or it will leak when it comes on boost due to the...

video of said "Blowing" into this engine and making it run please!

Looking good chuck, When you say it will be a four stroke does that mean it will induct on a downward stroke, compress on an upward stroke, "fire" by admission of air on a downward stroke, and finally exhaust on an upward stroke? is this more efficient than just a simple two stroke design where...

ebay is a good place, ebay uk may ship to malta

Looking good jim, what are you using to seal the bottom of the liners from the oil in the sump? loctite or similar?

Im not going to work again incase the lathes get me

Certainly in real life turbo's are better than superchargers in my experience, thats why we see soo many turbo diesel and performance petrol turbo cars, the turbo makes for better fuel economy when off boost, and makes for higher torque accross the board when in boost as the peak boost can be...

i already have ideas running through my head! :big:

yes, as a seperate project i think a small turbocharger would be excellent! I would make one and use it as a keyring!

Hi, even with a hall sensor you would still nedd to differentiate which one of the eight cylinders is firing at any one time, so the need for a distributor is still present, hope this helps

Turbocharging is something im very familiar in full sized practice. If the turbine and compressor wheels were accuratly machined from the solid then they would need not be balanced. As in full sized practice a wastegate could be incorporated into the exhust housing to regulate boost...

Amazing work, you got me following ;)

You set the timing to the optimum setting by adjusting until it runs best. There is no way of saying what is the exact angle as the whole physics of the engine would vary the timing. Its similar to a four stroke engine, in theory the exaust valve and inlet valve should never be open at the smae...

i would really like to see some pics of this but photobucket is down for maintainance just now!

Nice model! not sure the stirling helicopter idea will take off though! sorry couldnt help it!

very interesting thread, i am a shooting enthusiast myself and have often thought of making a working air rifle or similar, keep up the good work!

or just use bronze bearings like turbos do, thay do 100,000 rpm

see my picture at the top of the post mate, timing is controlled by two crank discs, it wont run AT ALL if it is minutly out

or use a worm reduction as i first said ;)

centrifugal superchargers use epicyclic gears and run at 50,000 rpm, so i think it would be ok IMO ;)