1/4 Scale Cosworth DFV Engine

[JonC]

Hi all,

I've moved this away from my introduction a while ago and have some progress to show, however I'm struggling with the file size limitation for uploading photos and videos.
Can anyone tell me what the get-around is please.

thanks

Jon

[Vixen]

Hello Jon,

I use the 'Coppermine' image hosting website set up by AdeV our system Admin and top computer wizz. It was set up to overcome the 'Photosuck-it' problem we had a while back. Have a look at this link, it tells you all you need to know.

http://www.modelenginemaker.com/index.php/topic,7249.0.html

Cheers

Mike

[Roger B]

I still use Microsoft Office Picture Manager to compress my pictures for the forum. The documents option works well. There are plenty of other compression programmes available.

I upload my videos to YouTube and then paste the link into my posts. The 'embed YouTube' button above does not always seems to work.

[JonC]

Thanks for the replies guys, I'll take a look and see if I can sort.

To be honest I'm struggling with posting anything on here, I'm a total newby at this and not sure what I'm doing.

I'm sure I'll get the hang of it eventually.

jon

[JonC]

does this work?


<a href="https://www.youtube.com/watch?v=HxWjaYZWrjo" target="_blank">http://www.youtube.com/watch?v=HxWjaYZWrjo</a>

[Roger B]

I can see that  Looks excellent 

[stevehuckss396]

Good grief i hate when people record with the phone held vertically. makes me feel like im looking thru a key hole.

[JonC]

Good grief i hate when people record with the phone held vertically. makes me feel like im looking thru a key hole.

Steve, I'll get used to it in time.

jon

[JonC]

Would appreciate any thoughts on how to investment cast the DFV block. It's full of return angles and has the web across the top of the cylinder banks making it quite tricky.

At the moment I'm going down the avenue of splitting the block into six separate chunks that could be moulded in wax and then melted together for the full block. These would be -

Front
Left cylinder bank
Right cylinder bank
Bottom end
Rear
Web

I have printed these in 1/8th scale and have just printed the reverse mould for the right cylinder bank to see if it will work.

[gerritv]

Now that I  have a 3D printer I am going to follow this thread daily! I have plans this winter to try casting Zamak in plaster molds using PLA prints as the pattern. This will get burned out prior to casting.

Gerrit

[JonC]

Hi Gerritv,

sounds like were both on a learning curve this winter 

[JonC]

Decided to start with a simpler part than the block to produce a wax, so I've been working on the Head. No idea if this will work but I've reversed printed the six faces and tongue and grooved them. Just need to put holes in to fill and vent and then give it a try.
Thinking that maybe I'll need to put some sealant around the gaps to stop the wax leaking out perhaps. Also guessed at plus 6% for shrinkage.

[ddmckee54]

Jon:

I made a silicone boot for my 3D printer using a mold process similar to yours',   I used high temp silicone caulk to make the boot.  The leakage through the joints between the mold parts is not that bad of a thing, it gives any trapped air a place to go.

How easy will you be able to clamp the mold parts together?  I made mine to slot together in a sequence, my mold mostly worked.  I got a usable boot out of it, but it's not pretty.  I know that I need to redesign the mold before I make anymore.

Clamp your mold together and do a test shot, that will tell you what parts of the mold you need to fix.  I'm guessing that you might need to change the tabs that align the mold parts, getting it clamped together might be a trick.

Don

[JonC]

Thanks Don, there's hope yet.

I'm not sure how runny the wax is but I would think that it's more runny than silicone so I'm hoping that leakage is only slightly worse. If it's too bad then I'll try some rubber solution glue or something.

As you can see my mould sides slot together into a box so I'll just get some tight rubber bands around it to hold it all together.

Jon

[Vixen]

Hello Jon,

I am not sure whether my adventures in pattern making and lost wax casting will be of any interest to you.

Have a look at reply 25 onwards and decide for yourself,  http://www.modelenginemaker.com/index.php/topic,7559.0.html

Any questions, just ask

Mike