Jump to content

WW1 Thornycroft restoration


Great War truck

Recommended Posts

  • 5 months later...

Hi selling this on Ebay if anybody interested http://rover.ebay.com/rover/1/710-53481-19255-0/1?icep_ff3=2&pub=5575378759&campid=5338273189&customid=&icep_item=284246864651&ipn=psmain&icep_vectorid=229508&kwid=902099&mtid=824&kw=lg&toolid=11111

  • Like 1
Link to comment
Share on other sites

Hello Dave,  I tired several ways to see what you are selling on US EBAY and also UK EBAY.  Please purify your EBAY listing as it does not work as is.  It may be good to suggest what it is that you are selling, you may have more interest.  I am curious but lost!

Al

Link to comment
Share on other sites

Hello Andy,  Thanks for your reference.  Yup, Dave was just trolling for a sale of a radiator shell that has ZERO to doing with this WW1 Thornycroft rig.  Thanks for helping us to sort out the EBAY listing.  Now if that piece was from an original 1917 Riker...........

Al

Link to comment
Share on other sites

  • 1 month later...
Posted (edited)

Steve fitted the second of three gas generators to the Thornycroft. The platform which holds it has required something on it to stop people using it as a footstep. After fitting he took the bolts off again for some adjustment, so not a permanent fit yet. It does look nice though. Thanks again to the forum member Peter for putting me in touch with the previous owner.  

DSCN9913.JPG

DSCN9917.JPG

DSCN9920.JPG

DSCN9921.JPG

Edited by Great War truck
  • Like 6
Link to comment
Share on other sites

  • 1 month later...

We had the great good fortune to be invited to the Shuttleworth Flying Day at Old Warden last weekend and took the lorries.

014.thumb.jpeg.efff050bbf2b7d21b38f30d7712b9bc6.jpeg

015.thumb.jpeg.ddaccefd141faf2412683f9df1969a7c.jpeg

We had a super time and was our longest run to date with the Thorny. On inspecting it later, we found that the HT leads were beginning to bubble and one of the magneto terminals had melted which is a bit concerning.

016.jpg.912da09ad0ee63f095f659113cf6d481.jpg

017.jpg.3e152acaa098fbb82d78d4c6f06fd3bd.jpg

The magneto is very close to the exhaust manifold but is exactly the one (Simms SR4) called up in the parts book and, as far as I can make out, has been installed exactly as it was originally. There is nothing I can do to move it further away so I have bent up a piece of aluminium and made a heat shield which I have bolted to the main shield.

018.jpg.1e9215477187de880f325219a6b1c6f7.jpg

019.jpg.532e5c1ed4ea221cb2f182bece082965.jpg

I don't like deviating from factory build but see no option here if I am not to suffer a failure on the road. We have not seen any signs of a shield in the old photos but surely they must have suffered the same issue. Very curious.

Steve   🙂

  • Like 2
Link to comment
Share on other sites

Steve, is your engine running hotter because of the modern petrol? It would be interesting to have an exhaust gas temperature probe in place and try different petrols.

Link to comment
Share on other sites

1 hour ago, Asciidv said:

Steve, is your engine running hotter because of the modern petrol? It would be interesting to have an exhaust gas temperature probe in place and try different petrols.

And maybe different timing. 

Link to comment
Share on other sites

Steve,

There was a modification to the heat shield by the military and it is mentioned in 'Auriga's' Book of the Thornycroft, in the section following p. 45, 'Alterations in details of J type W.D. Lorries.'

Nov., 1914 Hot-air Oven. - Oven deepened.

The army version curved round more and may have protected the mag better.  One of these military heat shields has survived and is in place on the X type M4 engine on display at Milestones Museum. This vehicle was originally military.

Tomo.

Edited by Tomo.T
Not finished.
  • Like 1
Link to comment
Share on other sites

The Polyoxybenzylmethylenglycolanhydride (Bakelite to you and me) knob terminals on the magneto have a melting point of 150C. Not particularly high when in close proximity to the exhaust.

 

Link to comment
Share on other sites

Thanks Tomo and thanks Barry. I assumed that the knobs would have been a Phenol-Formaldehyde thermo-set and would have had to get a lot hotter. Only 150° is a bit more reassuring although it is probably not good for the mag itself. Something to keep an eye on.

Andy, what would you do to the timing? I have it set to fire on TDC when fully retarded but could probably advance it a bit more.

Steve  🙂

Link to comment
Share on other sites

3 minutes ago, andypugh said:

Possibly richer would run cooler? 

That's how they do it with rockets, deliberately adding too much fuel to reduce combustion efficiency.  You would get less MPG of course.

Link to comment
Share on other sites

On 5/16/2021 at 2:22 PM, Great War truck said:

Steve fitted the second of three gas generators to the Thornycroft. 

DSCN9917.JPG

 

 

Is there an external water supply or is there a reservoir/drip-valve sitting in the top of the generator assembly?

Alec.

Link to comment
Share on other sites

On 7/12/2021 at 10:16 AM, Rangie said:

Is there an external water supply or is there a reservoir/drip-valve sitting in the top of the generator assembly?

Alec.

Hi Alec.

Yes, there is the water tank and valve arrangement inside. What you can see is just the casing. I'll dig out some pics shortly.

Steve

Link to comment
Share on other sites

2 minutes ago, super6 said:

Poor electrical connections also generate heat via arcing, presumably there would be other symptoms though

When I fitted the heat shield, I did look for signs of arcing but the terminal was quite clean. I wonder if it is something to do with the modern volatile fuels? If we had been running lean, I would have expected the engine to boil up as well but it all ran very well. A bit of a puzzle but one for Tomo to look out for.

Steve 🙂

  • Like 1
Link to comment
Share on other sites

Wasn’t WW2 pool petrol something like 60 Octane? A guy on YouTube did an article on the Willys Go devil engine and how to tune it on modern petrol as the factory timing doesn’t work well with current fuels.

 

Weve got E10 coming in soon which apparently lowers the octane rating. I found a good YouTube video by a Brit, describing an easy way to remove the Ethanol which I thought was very good and worth a watch.

Link to comment
Share on other sites

  • 3 weeks later...

Thanks. I did look at the terminals to see if there was any discolouration but there were no signs. We are going to Quainton on the 30th so will have to see how it performs then.

Steve  🙂

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...