Measuring Pressure Pulses

**river** · 05-10-2006, 07:17 AM

Hi,

So, what's happening with this?

In the above diagram, are you only measuring at Point-A or are you taking measurements within the tube also?

seeyuzz
river

ed · 05-10-2006, 07:22 AM

i think point A would be the least interesting

point B and the interface of B with C is where the money is

i plan on hooking up with jeffro once my engines running and having a tweak with a few objects of interest (like pulse plates) on the dyno...

as foir this experiment: i dont care! people joined my forum - now 83 in total!! yay!!

**river** · 05-10-2006, 07:31 AM

Hi,

Originally Posted by ed_jza80

i think point A would be the least interesting

point B and the interface of B with C is where the money is

Logic units concur.

Also would be good to see what comes out of the outlet to help determine the eficcicency of the system.

I have some nice largish 12VDC motors about the place. I'm not sure if they'd run as fast a as drill - I'll have to check that - but they'll be quiter and won't require you to use a drill. Furthermore you can build a more permanent test rig without having to connect the drill each time (assuming it's your normal drill and not a spare just for this purpose).

seeyuzz
river

I'm scared if I join your forum I may say something frivolous and became the "Rona" of V8 dot com. Besides, do you want just numbers or actual contributors to your forum?

ed · 05-10-2006, 07:42 AM

noone seems to contribute anyway!! lol

**Ben Wilson** · 05-10-2006, 07:54 AM

I was talking to a friend about it yesterday and he is very enthusiastic about it, we'll probably start prototyping next week.

Luckily, he's already got a rig to hook up a SC14 to his lathe, so we are part way there.

I've been offered a loan of some good quality (expensive) transducers, so I'm thinking about baselining with them, then trying to duplicate the results with cheaper hardware.

**river** · 05-10-2006, 07:59 AM

Hi,

Is a lathe fast enough?

I know you won't be running the SC14 at 20,000rpm and you'll be running it slower and (I assume) extrapolate the results for other rpms, but is the air-flow through the SC14 linear?

seeyuzz
river

**Ben Wilson** · 05-10-2006, 08:14 AM

It will run it at 4k which should be good for around 200CFM. That doesn't sound like much, but when you're in the same room as it that's a lot of air.

Just did some rough maths* and that should be about 260ft/s through a 2" pipe so it should be in the right ball park for engines.

*may well be wrong, it's early