A pair of ‘Tigres’

[JasonBModerator @jasonb]

That runs very sweetly as do your other engines. Is it from plans or your own design?

J

[dean clarke 2Participant @deanclarke2]

thanks for the good comments, all the engines are my own design, the twin on here was my very first engine build, i cheated a little with this engine as i have used proprietry cylinder liners, 1 with a piston but the other i had to fit another original piston to it, lapped it in but otherwise i made all other parts except bolts and glo plugs. the engine runs not to bad for a first timer but i think my eyeometer was out a little on the intake port timing but never mind it still runs well. the v4 was my third engine and the first v4 i made. again propietry liners were used but this time i lapped the liners and made new piston etc for them. the crank is a 1 piece affair with the conrods split on the big end. crank is 4140 ht steel and rods are 2024 t6 alloy. be bolts are ht 00/80 cap bolts cast iron pistons with all other alloy parts from 6061 t651. after seeing ramonds mlling out the cases from solid i gave that a go with the 2nd inline twin. will upload the rest of my engines today. the v8 is the first engine i have done where i have made the liners as well.

thanks

dean

p.s. all engines are made useing manual machines and scribbled scetches with a few dimensions no plans as such

Edited By dean clarke 2 on 01/11/2012 19:36:45

Edited By dean clarke 2 on 01/11/2012 19:37:43

Edited By dean clarke 2 on 01/11/2012 19:40:16

[dean clarke 2Participant @deanclarke2]

here's a few more of my engines, hope you enjoy.
Dean

Edited By David Clark 1 on 16/11/2012 20:32:32

[SpringbokParticipant @springbok]

Dean
Utterly and completely brilliant work

Bob.

[Sub MandrelParticipant @submandrel]

Nice!

The inline twin is a lot like the Taplin Twin.

Neil

[TerrydParticipant @terryd72465]

Posted by JasonB on 01/11/2012 07:13:52:

That was an expensive way of doing it, rather than the removable glow clips I would have used the ones that stay wired in with just a small plug cap which I linked to earlier. That way if you just get the engine running and pull all the clips off and it dies you don't have to put all the clips back on.

It can also be wired with one positive wire to each plug and a common negative to the engine and the battery holder. You could wire a neat loom with just 4 wires and small plug caps or make glow plugs like old screwtop spark plugs as these ones on this Whittle have been.

Edited By JasonB on 01/11/2012 07:14:46

Eric Whittles original engine is very simply wired:-

Terry

[dean clarke 2Participant @deanclarke2]

hi guys, just wondering if anyone has come across multi cylinder glo engines not running when the plugs are turned off? any ideas on a cause? my v8 just doesn't want to keep running without power to the plugs. runs perfectly when they are connected.

dean

Edited By dean clarke 2 on 27/01/2013 06:32:35

[JasonBModerator @jasonb]

Probably plugs not getting hot enough which is likely due to the slower reving nature of your engine.

There are different temperature plugs available but not something I know enough about, have a look back through my Firefly thread as I think Ramon explains it there.

**LINK**

J

[Roderick JenkinsParticipant @roderickjenkins93242]

I'm sure Jason's got it right, although it's probably cooling down that's causing the problem. The "explosian" during the ignition cycle re-heats the glow coil. With 8 cylinders the plug has to wait 8 times as long as a single would for the next heat input and so has probably cooled down to a temperature that won't inititiate the burn. I'm afraid I don't know whether a hot plug equates to a long dwell.

Cheers

Rod

[JasonBModerator @jasonb]

Deleted

Edited By JasonB on 27/01/2013 08:30:44

[Sub MandrelParticipant @submandrel]

Dean,

I don't know if you solved your 'powering multiple plugs' issue?

Glow plugs are basically low-value resistors that pas a fair bit of current at low voltage. I understand old plugs were 2V but more modern ones may be happier on about 1.5V.

For your V8 you could wire them in series and run at 16V/12V (depending on plug voltage) at the same current as a single plug, but if one plug runs too hot and burns out, thay all stop.

You could run them in parallel on a single 1.5 NiCad or 2V lead acid cell, but the current would have it flat pretty damn quick!

A sensible compromise for 1.5V plugs might be having two strings of four plugs in series requiring 6V (four nicads/NiMH in series would do). the same source across both strings of plugs. For 2V plugs you could use six Nicads.

Some experimenting is in order as althouigh nicad/NiMH are nominally "1.5V" their useful operatingvrange is about 1.6V (when very freshly charged) to 1.2V nd about 1.4V for much of the discharge. Don't get too hung up on exact voltages as glow plugs are not hugely fussy.

Neil

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