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We’ve been working for more than 2 years on this project - to see how far you can bore and stroke a .40 case before it either doesn’t work, or becomes too fragile. We tried every piston and liner combination from .52 to .57 and after success with the .56 we have now arrived at a very nice .57!

(Camera flash has made it a bit blue! - see other J'EN pictures for correct colouring)

"The JEN56 is indeed a .40 size package that thinks it's a 60."
Malc Pinnock, (RCM&E September 2004) - Read the

Our follow up project to the successful .56 is the .37 (almost .40 performance from a small .25 sized case). Yes, I know its been done before!.. But we were keen to see how much power was available from a .25 case, before you needed to change the case size (and therefore weight ) to a .40 (or mid .38 ~ .40 sized case)

Our answer was the J'EN .37....

"It starts easily, goes well, has great transition and it’s very smooth. It’s a quart of power in a pint pot and if it came in a tin then I am sure Just Engines would say “it does exactly what it says on the can!"
Steve Dorling (AMI July 2005) - Read the .




Related products:

1. JEN 6oz Fuel Tank

2. JEN Purple Nylon .25 to .37 Mount

A 40 sized Purple Pipe, Purple Manifold of your choice & Accessory pack (silicon joining tube, silicon clamps & tube mount) all for a great price of only £50!

A 60 sized Purple Pipe, Purple Manifold of your choice & Accessory pack (silicon joining tube, silicon clamps & tube mount) all for a great price of only £60!

Supplied complete with

• Full instructions (please request the wiring diagrams for multi cylinder engines if needed)
• Universal Radio Leads (JR, Futaba etc...)
• L.E.D. (so you can see when unit is operating)
• NICAD (1900-2000Mah)
• * Glow system for twin systems has Extra Nicad and lead for just £7.50

Compare that to the other manual systems (that don't include a nicad in the price) and you'll realise what 'cracking value' this is.

Customer Feedback;
I have 4 of these now and they're just brilliant - no trouble at all - the best thing since sliced bread!! - please send me 3 more.
Thanks. P. Savage

Silicon Joining Tube, Clamps & Mount for up to 60 / 90 pipe systems.

This is a very straight forward smoke system that is powered by a Perry pump.

No need for batteries and therefore no need for wiring and charging. This system uses ordinary diesel and comes complete with everything you need except a small tank.

Click on picture to see larger image.

System includes; Perry pump; On Off Switch (you do need a spare servo for this); One Way Valve; Short length of Diesel Tubing; Diesel Conversion Bung for a tank and Smoke injector for the Exhaust (last two items are not shown in the picture).


Related products:

1. JEN 4oz Fuel Tank

2. JEN 6oz Fuel Tank

3. JEN 8oz Fuel Tank

This is a very straight forward smoke system that is powered by a Perry pump.

No need for batteries and therefore no need for wiring and charging.

Click on picture to see larger image.

This system uses ordinary diesel and comes complete with everything you need except a small tank.

System includes; Perry pump; On Off Switch (you do need a spare servo for this); One Way Valve; Short length of Diesel Tubing; Diesel Conversion Bung for a tank and Smoke injector for the Exhaust (last two items are not shown in the picture).


Related products:

1. JEN 4oz Fuel Tank

2. JEN 6oz Fuel Tank

3. JEN 8oz Fuel Tank

Supplied with 2 sizes of sensor holder, hall effect sensor and cable tidy for the wiring.

Battery, spark plug and magnet not included.