franchi

Hi:

I am in the process of getting a couple of ETA Diesel engines running again but I need the TD nva The engines were at one time equipped with the TD nva but they have been stripped of parts. I would like to get these engines running again as they appear to be in very good nick!

The one engine has a TD reed valve installed in the rear cover to adapt the TD nva! It was a lot of work at one time. I am curious if it worked well!

Tia,

Franchi

franchi

That was supposed to read TR Diesels as in Team Race!

aspeed

http://texastimers.com/ they have the .049 fine thread needle valves. The carb you may need to hunt a bit harder for. The .049 carb is 1/4" - 32, so a burned glow plug may work in a pinch with some fiddling to make a groove and some tiny holes.

greggles47

Franchi,

If you're after the Cox style banjo NVA set, better than original can be obtained from Steve Rothwell -http://www.smrpl.com.au/

qazimoto

My Feedback: (1)

As Greg said above, the Rothwell Banjo, NVA and Venturi's are the Rolls Royce solution to our friend Franchi"s problem. He may find them a bit more expensive that the Cox alternative though.

I've taken a few pictures of various 09 and 15 sized diesels with alternative Carburettors/Venturi assemblies. The main advantage of using the peripheral fed venturi's is slightly increased fuel economy, and (perhaps more importantly) the ability to change to a bigger or smaller air intake very easily.

A Super Tigre G20/15 Diesel fitted with a Cox 049 Kustom Kraftsman Banjo, and NVA with a Cox Venturi. I'm guessing that this is the setup that Franchi is describing.













PAW 09 TBR with a Rothwell R150 Venturi (Cox 049 clone assembly) and a fine KK NVA fitted into a 1/4" x 32 tapped Al venturi insert.





Standard Cox 049 assembly on PAW 09 TBR, the venturi hole has an Aluminium alloy plug insert tapped 1/4" x 32 tpi. The Cox venturi screws into this.









PAW 09 TBR with a standard Cox TD 049 assembly. The venturi is 5/32" inside diameter I believe. The engine is the Goodyear version, with the NVA going through where the 2 BA retaining grub screw normally goes. Hence the JB Weld sealing the two holes.

qazimoto

My Feedback: (1)

These engines are early model Nelson .15 Diesels. One is fitted with a Rothwell R250 (.15 sized diesel) carby assembly. This is equivalent to a Cox TD 09 carby. The other has a Cox TD .15 assembly. Normally the .15 sized diesels will run happily with an intake size from about 3mm to a maximum of about 4.5mm. The smaller sizes are suitable for a c/l combat model on suction. The Racing sizes tend to be a little larger.

You can bore an 049 venturi out to about 4.2mm diameter which suits the G20/15. However the modern design engines need the fuel "through-put" that the 09 and .15 versions provide.

franchi

Hello Gaz:

That is indeed what I was looking for to add to a ETA .15. I just want to get these ETA Diesels running. They are drilled and tapped for the TD nva.

Many of the ST G20/.15D engines that I picked up had the TD nva installed just like you have shown in your pictures. The rest of them have stock ST nva. This must have been the hot setup back in the day. I had enough parts to put together about 4 ST G/20 .15 glow engines. I have not run any of the G 20's yet but they should do quite well. All of the ST Diesel engines have custom heads that are made just like the newer Davis conversion heads. Perhaps this is where Davis got the idea for his design. I think that all of these Diesel engines were used in the 60's.

Enough for now.

Stay well my friend,

Franchi

I just enjoy the Diesel engines as sport engines but how many engines does one need? Ether being nearly impossible to obtain here in the States, make running Diesel engines impractical! What a loss!

I also picked up a ST .29 RV that has been converted to Diesel complete with a crankcase pressure system. That should be fun to play with! Lol What event would one use this engine?