Demon V8

[rmalsen]

and here I was thinking you where turning it into a 16 cylinder LOL

 

[michael-au]

I decided to have a go at making a mould to make silicone caps for the spark plugs
Didn't turn out to bad

 

[michael-au]

A couple of the silicone caps I have made so far

 

[Steamchick]

How do you support the core?
Personally, I think I would have tried to support the HT wire and connector so they are cast-in.... and probably got it wrong? But I am interested to know your process?
K2

 

[Carbuilder]

That is really cool! Very nice design and machining Michael.

Steamchick.....if you look at his pictures you'll see the core support pieces, machined aluminum that look like they bolt to the sides of the main block once it is bolted together. Very nice design.

 

[Steamchick]

Thanks Carbuilder. I needed that explanation. Not knowing, they didn't mean anything to me, but now I can see!

(I'm basically a "Know-nowt").
Cheers!
K2

 

[michael-au]

Here are some pics of how the mould works, basically It is how car builder has explained
The 2 halve of the mould are filled and screwed together and the end plates screw to the sides to form the holes

I sure the end plates on to one side first then fill with silicone, put the two halve of the mould together and then screw it all up tight.




This a link for the drawings. View attachment Boot_Mold.zip

 

[Steamchick]

I knew there was more to it than I had appreciated!
Well done! - And thanks for explaining.
K2

 

[Gabe J DiMarino]

How are you injecting the silicon?

 

[michael-au]

How are you injecting the silicon?

Hi
I don't inject the silicone, I just fill the mould both side and the excess is squeezed out through the holes in one of the side plates

 

[Steamchick]

Thanks, Can you advise on the silicon you use? - I have window sealant, bath sealant, engine sealant, and some 3-bond TB1217F product. (Fixed some double glazing, didn't leak in 30 years, but the devil to remove!).
K2

 

[michael-au]

Thanks, Can you advise on the silicon you use? - I have window sealant, bath sealant, engine sealant, and some 3-bond TB1217F product. (Fixed some double glazing, didn't leak in 30 years, but the devil to remove!).
K2

I got it from eBay

 

[Ken I]

For anyone interested - a link to a tutorial I did some time back on moulding using vacuum and pressure.

Injection / Vacuum Moulding in Polyurethane

When moulding silicone in aluminium moulds be sure you use the correct release agent - I have a mould with a permanently moulded silicone part which I have never been able to recover.

Regards, Ken

 

[michael-au]

For anyone interested - a link to a tutorial I did some time back on moulding using vacuum and pressure.

Injection / Vacuum Moulding in Polyurethane

When moulding silicone in aluminium moulds be sure you use the correct release agent - I have a mould with a permanently moulded silicone part which I have never been able to recover.

Regards, Ken

The silicone that I’m using is soft and flexible, just falls out of the mould, never looks like sticking
Not sure if it’s the best for what I’m using it for, it is heat resistant
Maybe there is something better, this is the first time I have tried to make spark plug boots

 

[stevehuckss396]

How long do you need to let the silicone cure before you crack the mold? The product I use needs 10 minutes. It's a 2 part puddy and only comes in light gray.

 

[doc1955]

I use a 2 part rubber compound that works well and is very durable black in color. I found the stuff on ebay.




Also made distributor boots with the stuff also.

 

[michael-au]

How long do you need to let the silicone cure before you crack the mold? The product I use needs 10 minutes. It's a 2 part puddy and only comes in light gray.

Yes it is 2 parts, you can mix it so it sets in 10 to 15 minutes

 

[Gabe J DiMarino]

doc 1955 would you mind sharing a pic of the container for the black silicone you are using ? Any numbers on the can ? Thank you sir.

 

[doc1955]

doc 1955 would you mind sharing a pic of the container for the black silicone you are using ? Any numbers on the can ? Thank you sir.

It is not silicone it is rubber got it off of ebay from a seller Erope it is a 2 part rubber.

 

[michael-au]

Thought i would start making some rocker arms using 4th axis


here is a video of the process, it’s not in real time so it is a short video