I have reinvented the way air flows into an engine!

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I thought I might share with you what Ive been doing.
I hope this may not be the wrong place to post this thread.

I have a 1986 Nissan Bluebird wagon 2000 cc (no EFI on this one),
which I have modified the intake track to be different than what is
out there, I ignored what I read on the internet about porting once
again and did my own thing.

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 can also get 15 mpg as well.

When I first ran my second engine with a STD timing a little
retarded I experienced very poor fuel efficiency under high load
and rpm but I had plenty of power, I also was able to exceed the
delivery from a single fuel pump (electric 1 L/min).

My engine timing is linear with rpm and depending on what
temperature the engine is run at I need to fire it in the power stroke
eg after TDC to stop knocking

I use a wire wheel to port my manifold and ports, I welded an
extension shaft to it ro reach in.

My ports look like this

http://i231.photobucket.com/albums/ee44/smokingwheels/Engine%20stuff/INLET_ PORT_SURFACE.jpg

have a look at my web site too there are intake recordings.
Visit My Website (http://ampair.tripod.com) on the sound page.

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.

I have a video of fuel flowing from vac sec with no load this should not happen normally.
Click here (http://www.youtube.com/watch?v=e0eWFo3FKPw)

posted by  smokingwheels


posted by  Wally

yes a L20B engine
Ive had it for about 4 years now, when I got it it had a broken head bolt I only found this out after removing the head to do it up.

posted by  smokingwheels

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