I have found a way to increase intake air flow

[smokingwheels]

I have modified the intake track to be different than what is

out there, I ignored what I read on the internet about porting and did my own thing.

I was wondering if anybody was interested?

I am also looking for sounds recorded from the carby when under WOT going thru the gears, you would need a laptop to record it, PM if you can do it for email address.

[sblake01]

Still smoking after all these years!!!!!

Edited November 22, 2009 by sblake01

[smokingwheels]

Still smoking after all these years!!!!!

yep

I have experienced as high as 60 mpg (4.71 L/100km) over a 220 km journey with my latest engine

[sblake01]

I'm not sure what one has to do with the other. I'm still trying to figure out what you meant a couple of years ago when you said:

my stock donk goes to 7500 before i kill every banger +-30 rpm but I only fire every second banger above 7300 +-30 rpm

[smokingwheels]

I'm not sure what one has to do with the other. I'm still trying to figure out what you meant a couple of years ago when you said:

It means I have a 2 stage rev limiter and a banger is a piston

[Walter Moore]

It means I have a 2 stage rev limiter and a banger is a piston

Why wasn't that obvious to everyone earlier...

[Z train]

I have modified the intake track to be different than what is

out there, I ignored what I read on the internet about porting and did my own thing.

I was wondering if anybody was interested?

I am also looking for sounds recorded from the carby when under WOT going thru the gears, you would need a laptop to record it, PM if you can do it for email address.

Ignoring physics always produces interesting results.Doesn't it?

Still smoking after all these years!!!!!

[TomoHawk]

What does recording the carby sounds have to do with increased the intake flow?

thxZ

[sblake01]

I guess he'd need those sounds to compare them to whatever he's done. Remember, he has a modified intake track wihich is different than what is out there. It likely wouldn't sound the same:)

[smokingwheels]

You use a wire wheel to port your manifold and ports, I welded an extension shaft to mine, your ports

should look something like this

have a look at my web site too there are intake recording on the sound page.

http://ampair.tripod.com

Beware there are pit really big falls with EFI systems.

1. WOT fuel delivery a 2000 cc engine needs 1000 cc/min with air cleaner removed.

2. Flap airflow meters would go off scale too.

3. there may be some spark timing problems to do with range.

Beware the timing needs to be tuned as carbon builds up.

I dont know why that is.

I have a laptop interfaced to my second engine with my own program.

eg computer controls the engine timing and 2 stage rev limit.

The timing is linear with rpm as far as I can tell to 7200 rpm

eg plot a line 0 deg at 400 and 35 deg at 10000, 6000 is about 20 deg from memory.

If anybody has a flow bench handy you could bore out PVC pipe as a test, before cutting into any alloy head.

Things like feed rate in and out of the tube would have to be noted

I have a 1986 Nissan Bluebird wagon 2000 cc (no EFI on this one)

I have tested fuel efficiency at idle and its in the range of 12 to 14.2 c.c./minute running a mixture of normal to slightly rich.

I have the test video's on Youtube you can go to my web site to see the 5 clips there,

http://ampair.tripod.com/Fuel.html

From what I have read a normal 2000 cc engine at idle consumes 24 to 26 cc of fuel per minute.

I have improve fuel efficiency under highway driving conditions, I have experienced as high as 60 mpg (4.71 L/100km) over a 220 km journey on a hot summer's day cruising around 80 km/h.

I have a stock carby and my vac sec are fully open at 2000 rpm

it used to be approx 4000 so I can only guess at the air flow.

[smokingwheels]

What does recording the carby sounds have to do with increased the intake flow?

thxZ

I have nothing to compare to, when air moves it create a pressure wave (sound), my manifold and head seem to oscillate when the valve's are shut I need to see if a smooth surface does this, this oscillation is a good thing because it keeps the air and fuel moving in.

I have zoomed in at the waveform the first pic shows where the valve opens and the second one is better quality

note: when the valve opens some times the signal goes a bit flatter Im not sure why this is as yet.

[smokingwheels]

Ignition control, well I can't find any around to do what I want

so I put a request into the MSD engineers.

If you might be interested to port an engine like mine you may need a good system to fire the spark correctly.