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Can we use aluminium (with cast iron cylinder) to reduce the weight of the piston ?

-Satyaviajy.

Thank Ian, for your detail information.

Satyavijay.

Thanks Ian. I appreciate your helping nature to all.
Sir, what will be the appropriate length of piston for 35 mm OD (without seals) ?

Satyaviajy.

I am thinking to make cast iron piston for beta kinematic engine of following specifications. If any suggestions / corrections please guide - 1. OD- 35 mm 2. Length - 35 mm 3. Displacer Rod Dia - 5mm 4. There will be no any seals. Is this heavy piston will work for beta engine ? What will be the wei...

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What is the required volume ratio (compression ratio) for free piston stirling engine ? Whether is it lower or higher than kinematic stirling engines ?

-Satyavijay

Thanks Ian. After so many changes my free piston engine is physically ready and by pressing it's piston, displacer moves accordingly. I have used magnets for spring action. The engine is vertical and heater is at top and hence it is difficult to heat it. I tried with press iron to heat but it is not...

Thanks for your suggessions. I am thinking to use mechanical spring (for easy to adjust) for piston and gas spring for displacer. If I give more heat (500-550*c) then whether it is possible to run FPSE horizontally ?

As per Ian I have prepared the MS cylinder of ID 25mm & one CI piston & one MS piston. Both cylinder and piston are grinded. Piston OD is kept less by 4 to 5 micron. CI piston is smooth as told by Ian. Pistons are free in the cylinder & if I press the the piston it resists and bounces ba...

Thank you very much, Ian. Now I will prepare the cylinder (MS) and piston (CI) and I am thinking to grind the cylinder and piston. Then I will take sliding test and put the results on this forum.

Thanks Ian for reply. I am preparing cast iron piston (now it is in workshop for turning) in mild steel cylinder as per your comments / remarks on this forum. But I want to know how much microns it should be less than cylinder ID & if I press the piston in cylinder (keeping other end of cylinder...

Can we give teflon coat on piston for sealing purpose ? and whether it will work in 300-400 degree celcius ?

Very nice work ! Whether small diameter piece is must between heater cylinder and power piston cylinder is neccessary? What is the torque? I am wating for your plans.

I am very new to this forum.I am constructing themoacoustic stirling engine but my first try failed. Flywheel is not rotating due to vaccume and compression before applying heat to the engine. My question is whether after constructing engine and before applying heat if I try to move flywheel, should...