Demon V8 (multiplied 1.5)

[Foketry]

I bought the drawings over 2 years ago, waiting for my retirement and waiting to learn and improve my engine model construction technique.
Now, after building Hovell V4 and Holt 75, I try to make a more challenging project, Demon V8 x 1.5
I decided to multiply all the dimensions 1.5 times to have a piston size close to 24/25 mm, about an inch, so as not to have parts too small to mill and turn.

 

[Foketry]

 

[Foketry]

Note the wrong position of a hole, I'll have to close it

 

[stevehuckss396]

at 1.5 thats going to be pretty big. i'll be keeping an eye out.

 

[johnmcc69]

Good stuff!
I'll be following along.

John

 

[Endamur]

Me too... looking forward to your build progress. This is an engine that I am also planning to build in due course.... the 1.5x version will be very interesting. I have already modeled it in Fusion and started the CAM process. I have met Steve Huck a few times at the various shows and he has been super helpful answering any questions that I have had. Good luck with the build.

 

[sition]

Good stuff!

 

[Foketry]

at 1.5 thats going to be pretty big. i'll be keeping an eye out.

Steve , Thanks for the great project, I'm not very knowledgeable about American engines, is this Demon derived from a Chevrolet engine ?

I followed all the posts about this engine on this forum, I studied all the published photos, now I think I have the skills to build it

 

[Foketry]

 

[Foketry]

A change from the original design, I made 2 seats for Viton oring for each cylinder to avoid water loss, one at the top of the cylinder, one at the bottom

 

[stevehuckss396]

It shares the Chevy arrangement and firing order. Mostly because I know it by memory and that makes working on it easier for me.

 

[Foketry]

oring locations

 

[Foketry]

cylinder liners , all built in steel except one in cast iron to check if there are differences in compression
What do you think about cast iron or steel for liners ??

 

[Foketry]

installed OR in position

 

[Foketry]

milling of the head-supporting surface

 

[Foketry]

lapping of cylinder liners, once positioned in their seat , to ensure cylindricity and roundness

 

[stevehuckss396]

Outstanding!

 

[e.picler]

Hi Foketry!
Great work, congratulations! You are progressing fast.

Could you post some pictures of your lapping tool and also how you used it?

Thanks,
Edi

 

[Foketry]

Hi Foketry!
Great work, congratulations! You are progressing fast.

Could you post some pictures of your lapping tool and also how you used it?

Thanks,
Edi

I purchased this barrel laps in Ebay USA, only the brass body, I built the two steel parts myself.

 

[Foketry]

I built this too, it works

https://www.model-engineer.co.uk/forums/postings.asp?th=81230