Engine and Transmission Tech

Well I got the cunning plan from the welder today, but my photo-uploader has gone on strike... so... an 18" length of 2 3/8" stainless pipe that just slips inside the tailpipe, the bung is welded 8" from the end that goes in the tailpipe so there's a second tailpipe, as it were, sitting behind it with the sensor 9" from the end.

It still reads 14.9 all the time. Even with the choke on.
So I'm sending it back.

As a rule I don't use Amazon, I don't like Amazon, but I must say their returns process is pretty painless.

I can't buy the Auto Meter over here, only special order, so I just bought one of these Innovates [www.demon-tweeks.com] let's hope that works.

Ivor

Ivor you mean the O2 sensor, not the gauge?

Yes, the sensor bung is welded into the pipe.

Useful having that 8' run of loom, but I can't imagine it would reach to the driver's seat with one of your 70s boats lol.

Ivor

So having bought a new photo uploader... well, it's 2006 NOS, but anyway... here was the first attempt that was probably too much in the air



and here's the cunning plan



or at least it would have been cunning if the gauge had not been u/s. Let's hope the Innovate sensor fits the Autometer bung that's welded in there. A couple of days and I should know.

Ivor



Edited 2 time(s). Last edit at 08/02/2022 08:55AM by MGBV8.

Good progress yesterday.
Around 14.5 - 15.0 on economy.
Still rich on power and WOT, nearer 11 - 12.
May be able to fix that by reducing the secondaries. There are no more needle options with the 083 jets that weaken the power without weakening the cruise.

The Innovate AFR worked OK, but it reminded me why I don't like digital gauges... too sensitive, flickering, changing all the time, hard to read. It needs some sort of damping.
The Innovate sensor does thread into the Auto Meter bung, but it's longer. The Innovate bung if I had used it, is 1" thick, the Auto Meter 3/8" so now the sensor protrudes further into the gas stream than it should, but it won't come to any harm in the tailpipe.

Innovate's 8' of wiring is longer then Auto Meter's 8', so I'll be able to make a temporary mount for the gauge on the dash. I didn't find it easy trying to read the gauge on the passenger seat while not running off the road.

The sensor fitting recommendations are very different:
Auto Meter say to site the sensor 4" away from the cylinder head, Innovate say at least 24", and it seems the further back the better so long as it's not after the cats.

Fred.... I didn't try advancing the timing yet or go to unported... all other things being equal does that make the mixture weaker or richer?

Ivor

Generally Ivor, The timing has little effect on the fuel mixture.
The fuel mixture however does have an effect on the timing that an engine will tolerate.
Normally a leaner mixture will require less timing.
The best way to confirm engine timing is on a dyno. But you can do a reasonable job with timed acceleration runs as well.

Live like you mean it.
Fred

"Around 14.5 - 15.0 on economy.
Still rich on power and WOT, nearer 11 - 12."

Looks very close to me. You want it a bit rich when you stand on it. Mine is right at 15 on the highway & about the same as yours at WOT.

Oh, OK.
So if I take the secondaries down from 89 to 86, that might be about right.
I'll try that tomorrow.

Fred.... my Speedhut GPS speedo can give me 0-60 times... or could except the display is u/s. Lifetime guarantee, I need to send it back for repair, it's just the hassle..

Ivor

Still rich at WOT with 086 secs, around 11, so I tried 083s.
Still nudging low 11s.
I'm sure I could go to 080 secs, when I can be bothered to take the top off again.

So what I ended up with:
083 primaries.
Orange springs.
Accelerator jets 024 in the bottom hole.
7057 needles.
Will be 080 secs.

Thankyou for all the assistance.

Ivor

Have you revisited this thread, Ivor?

[forum.britishv8.org]

Ha, thanks, that was a while ago.
I have now.
And changed the title of this one.

Ivor



Edited 1 time(s). Last edit at 08/13/2022 11:17AM by 88v8.