Re: 123 ignition

#1

"Conor" <conor (AT) gmx (DOT) co.uk> wrote

Quote:

In article <7gsrtqF2nkjahU1 (AT) mid (DOT) individual.net>, Geoff Mackenzie says...

Post rebuild I'm having a bit of trouble with the ignition timing on my
1966
E-Type. Book says 10 btdc, but that was for 5* fuel; pre-rebuild it ran
OK
at 8 btdc on Shell V-Power. Now it pinks at the top end of the rev
range,
which is something I've never come across before. Retarding yet further
to
6 btdc gives smooth running with no pinking but a loss of power - haven't
measured it, but there's a definite lack of sharpness.

Suspect the electronic ignition, which I fitted in 1975 or thereabouts.
Wonder if the advance curve is no longer what it was.

Personally, I think I'd be making sure its not running lean at the top
end first.

--
Conor

Fair comment, but it's very difficult to tell. I'm working on the
principle that there can only be two things wrong - carbs or timing (barring
potentially catastrophic things like valve timing) so assuming the 123 does
what it says that eliminates one source of problems in one swell foop. I'll
keep you posted.

GeoffMacK

Quote:

www.notebooks-r-us.co.uk
I only please one person per day. Today is not your day. Tomorrow isn't
looking good either - Scott Adams

#2

In article <7h9c0oF2rfutbU1 (AT) mid (DOT) individual.net>,
Geoff Mackenzie <gmac (AT) chapterfive (DOT) org.uk> wrote:

Quote:

Thanks, Dave, but I won't take you up on your offer. I'd rather go for
an all or nothing approach, and uniquely I've not come across any
negative comments on the 123 on any of the websites I've looked at. So
I've ordered one, and should fit it this week ready for Goodwood.

It's almost certainly no more sophisticated than the Jaycar - assuming you
lock up a standard distributor first. And *a lot* more expensive. If I
were spending that sort of money I'd want a distributor free solution.

Quote:

Good luck with the MegaSquirt - sounds like a major undertaking!

Doing it bit by bit. Finally got the O2 sensor fitted today which was the
major headache.

--
*All men are idiots, and I married their King.

Dave Plowman dave (AT) davenoise (DOT) co.uk London SW
To e-mail, change noise into sound.

#3

In article <7h9c0oF2rfutbU1 (AT) mid (DOT) individual.net>,
Geoff Mackenzie <gmac (AT) chapterfive (DOT) org.uk> wrote:

Quote:

I'd rather go for an all or nothing approach, and uniquely I've not
come across any negative comments on the 123 on any of the websites
I've looked at. So I've ordered one, and should fit it this week ready
for Goodwood.

Forgot to add - do let us know how it performs.

--
*Taxation WITH representation ain't much fun, either.

Dave Plowman dave (AT) davenoise (DOT) co.uk London SW
To e-mail, change noise into sound.

#4

"Dave Plowman (News)" <dave (AT) davenoise (DOT) co.uk> wrote

Quote:

In article <7h9c0oF2rfutbU1 (AT) mid (DOT) individual.net>,
Geoff Mackenzie <gmac (AT) chapterfive (DOT) org.uk> wrote:
I'd rather go for an all or nothing approach, and uniquely I've not
come across any negative comments on the 123 on any of the websites
I've looked at. So I've ordered one, and should fit it this week ready
for Goodwood.

Forgot to add - do let us know how it performs.

--
*Taxation WITH representation ain't much fun, either.

Dave Plowman dave (AT) davenoise (DOT) co.uk London SW
To e-mail, change noise into sound.

First impressions - much improved mid-range, no trace of pinking. That's on
"factory setting" of curve no 4. Lumpy tickover, though. Will enjoy the
Goodwood thrash, settle it down a bit and try a spot of fine tuning. Should
emphasize that this is purely subjective - no times against stopwatch, no
rolling road etc - but after 35 years ownership you do get to know how a car
"feels" pretty well! Experimenting terminated when fuel pump decided to
pack up.....

Geoff MacK

#5

In article <7hf91jF2sqpe2U1 (AT) mid (DOT) individual.net>,
Geoff Mackenzie <gmac (AT) chapterfive (DOT) org.uk> wrote:

Quote:

Forgot to add - do let us know how it performs.

Quote:

First impressions - much improved mid-range, no trace of pinking.
That's on "factory setting" of curve no 4. Lumpy tickover, though.
Will enjoy the Goodwood thrash, settle it down a bit and try a spot of
fine tuning. Should emphasize that this is purely subjective - no
times against stopwatch, no rolling road etc - but after 35 years
ownership you do get to know how a car "feels" pretty well!
Experimenting terminated when fuel pump decided to pack up.....

Oh dear.

It should be possible to get it to run better in every way - mechanical
distributors are notorious for not giving an accurate curve after some use
- if indeed they did when new. And to add to that, modern petrol is very
different to the stuff which the car was designed to run on - and not just
the octane rating either. So an entirely different curve might prove
necessary.

--
He who laughs last, thinks slowest*

Dave Plowman dave (AT) davenoise (DOT) co.uk London SW
To e-mail, change noise into sound.

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Re: 123 ignition

Classic Cars (UK) Classic Cars in the UK (uk.rec.cars.classic)

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