Scott flame licker build

Gallery, Projects and General > Project Logs

<< < (49/59) > >>

NickG:
Good point John, that's what I was thinking - they should be made aware of your findings but they should want feedback like that. I bet some people can't be bothered to feedback but if we don't we'll always get a crap service. On the plus side, the quality of the kit and castings looks relatively good.
I'm guessing that not actually that many people have built this engine though.

Nick

Bogstandard:
You might be quite right Nick, I have never seen one before whilst going around the shows.

But on the other hand, maybe lots have been built, but can't be got to work, so are gathering dust somewhere.

There were no major issues with the castings or materials at all. With a little work, they were all perfectly useable and not one single inclusion, so they get a thumbs up :thumbup:, and for the price paid, I found very reasonable value for money compared to the garbage some suppliers charge for unrecognisable lumps of junk.

John

lordedmond:
John

With regard to your post on using PTFE for gaskets , I was helping the SWMBO to clear out some kitchen draws ( done some wall painting in WS so as it stinks it is OB ) I came across some thin black stuff that has a reinforcement in it , so I asked what it is , Linda told me it is the off cut from the liner from the bottom of the oven , If it can stand the oven temps the bit in the oven shows no degradation . Would you think it could be used for higher temp gaskets ?

I know its not an engineering site http://www.lakeland.co.uk/magic-oven-liner/F/product/3318?src=gpsol&sq=oven%20liner

Its about 20 thou thick
as I mentioned the stuff has a fabric type reinforcement layer so may be more stable in creep

Stuart

Bogstandard:
I have no idea Stuart.

I personally don't like the idea of it having some sort of fabric in there, giving it a surface texture.

When I bought my PTFE sheets, I stipulated that I didn't want an etched surface, but totally smooth. Gases will take the shortest route possible, and if it can fast track along a surface pattern to the outside, then it will.

John

madjackghengis:
Hi John, it's good to see such progress, and getting to the nitty gritty. In looking at that engine design, particularly the couple I've seen completed, including the one you show, I noticed the block of graphite sits blocking substantial flame propagation, and my experience with these engines is they are completely dependent on good flowing characteristics, with burners well positioned, and minimal interferance with smooth flow. I had to alter my valving on my own oddball several times, ending up with an "upside down" version of the "poppin'" valve in order to get good clear flow, and consistent running. I'm building one now, which will be posted shortly, and I'm considering using your valve arangement, but with some modifications precisely because I don't like the valve, whether bronze, steel or graphite, substantially altering the flow pattern of the hot gases during the intake stroke, as it is entirely atmospheric, and therefore easily disturbed causing substantial eddies and other interferances which can reduce actual intake of the heat by substantial amounts. I'm still finishing up the con rod setup, and have the head roughed, and have been waiting to see how this build turned out before deciding on valving. I'm wondering if you should have your valve going up, above the port, for the opening, giving the flame a less impeded flow than going over the block. I suspect this is also why others have rounded the graphite block or put forty fives on the corners, to lessen the flow interferance. Other than difficulties in starting, it has turned out very nicely, and I think you will easily conquer the problems with the valving. I am looking forward to devising a burner for my oddball, based on the demonstration of your burner design, and it's fine flame propagation. Waiting with increased anticipation for the running video. :beer: Cheers, Jack

Navigation

 Message Index

Go to full version