Supercharger On An St170 Engine

[Snapperpaul]

Have you seen my diagram on bellmouth radius effects on airflow?

Another one of over thinking moments!

[richardm6994]

I came across this one (can't remember where) but seems to give a good indication of what shape to strive for...

 

[Guest lotusPaul]

David Vizards book, How to build horsepower. Vol 1

 

Well i hope so but i dont have my copy here to confirm.

[Snapperpaul]

That's the one

What I mean is that's the diagram.

I found it interesting that the stubby profile gave such good results.

The full rolled edges are good and sharp edged trumpets not as good as one might think.

But that said a rounded profile is always better than a sharp edge.

Edited April 12, 2017 by Snapperpaul

[Guest lotusPaul]

Because it acts as a wing. The air has a greater surface area to "attach" itself too, therfore you get a greater charge on entry.

[Longboarder]

All the pics I have ever seen are about air being sucked. Naturally aspirated. When it's blown I imagine it's a bit different. Same smooth airflow principles, radii, port matching etc.

 

Nigel

[richardm6994]

It's been a while since I updated because I've been busy machining the supercharger outlet.

Unfortunately, the first effort (which took over 2 weeks) went in the bin because it didn't turn out as well as I'd imagine and it was better to just cut my losses and start over.

 

I'm much happier with mk2 and it's completion now signals the beginning of the end as all the bits are rebuilt for the final time, painted and fitted onto the engine....not long now.....

 

 

 

 

 

Edited May 14, 2017 by steamer

[Guest whiz]

That is just pure SEX

[richardm6994]

And now time for the kitchen worktop photo of the finished supercharger....

 

[Guest whiz]

Sorry but Ive just come in my pants

[Al Milton]

Richard you should only post pictures after the 9pm watershed.

Looks lovely

[richardm6994]

Here you go Andy, a couple more just to finish you off....(after the watershed lol)

 

Timing belt cover before and after modification

 

 

And here it is all in the car (very tight!!!)

 

[Guest lotusPaul]

Tight n sexy !!

 

Thats some amazing work

[richardm6994]

All going good so far.

 

https://youtu.be/ePJ14qLrypI

 

The edge of the belt is black and white which gives the optical illusion on the video that the belt is jumping on the crank pulley, but I'm really pleased that the belt is running perfect with no signs of wobble.

 

Obviously as the water plumbing is not done, I could only give her a few seconds of running to check things. Next job is to sort out the new rad and intercooler so I can run her up to temperature properly and put her through her paces before having a tidy up in the engine bay.

 

 

Edited May 21, 2017 by steamer

[Guest whiz]

Great progress Richard it's sounds good