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What am I looking at #641443
31/05/20 03:08 PM
31/05/20 03:08 PM
Joined: Jun 2019
Posts: 99
Bethel, CT USA
PaulyG Offline OP
Just Getting Started
PaulyG  Offline OP
Just Getting Started

Joined: Jun 2019
Posts: 99
Bethel, CT USA
Since I pulled the leaking water pump I started do look around and do a little cleaning. This is a picture of the timing marks. I assume they say TOP DEAD CENTER, and 4,8 and 12 degrees before TDC. I also found the mark on the crankshaft pulley.

What should the timing be on a 73 4/4? As far as I know the timing had never been checked so I thought I'd add it to the list. Any tips on checking the timing? I don't think I've done it since I was a kid.


[Linked Image]

Re: What am I looking at [Re: PaulyG] #641448
31/05/20 03:25 PM
31/05/20 03:25 PM
Joined: May 2011
Posts: 1,189
Near Windsor Berkshire
R
Rog G Offline
Has a lot to Say!
Rog G  Offline
Has a lot to Say!
R

Joined: May 2011
Posts: 1,189
Near Windsor Berkshire
They do say TDC, 4, 8, 12 degrees before TDC. For a standard tune Xflow 4/4 somewhere around 8 to 10 degrees before TDC should be correct.


2013 M3W
1971 4/4 2 Seater
1934 Sports
Re: What am I looking at [Re: PaulyG] #641453
31/05/20 03:33 PM
31/05/20 03:33 PM
Joined: Aug 2015
Posts: 822
A
Arwyn Williams Offline
Talk Morgan Regular
Arwyn Williams  Offline
Talk Morgan Regular
A

Joined: Aug 2015
Posts: 822
8-10 before TDC with the vacuum advance disconnected

Arwyn

Re: What am I looking at [Re: Arwyn Williams] #641458
31/05/20 03:47 PM
31/05/20 03:47 PM
Joined: Nov 2018
Posts: 1,719
Northants, UK
TBM Offline
Talk Morgan Enthusiast
TBM  Offline
Talk Morgan Enthusiast

Joined: Nov 2018
Posts: 1,719
Northants, UK
Originally Posted by Arwyn Williams
8-10 before TDC with the vacuum advance disconnected

Arwyn


Is that the same with an unleaded conversion? Want to check mine too,


1972 4/4 4 seater
Too many ratty motorbikes
Re: What am I looking at [Re: TBM] #641480
31/05/20 05:26 PM
31/05/20 05:26 PM
Joined: Aug 2015
Posts: 822
A
Arwyn Williams Offline
Talk Morgan Regular
Arwyn Williams  Offline
Talk Morgan Regular
A

Joined: Aug 2015
Posts: 822
Especially for an unleaded conversion. It's what I set mine to!

Arwyn

Re: What am I looking at [Re: Arwyn Williams] #641491
31/05/20 05:53 PM
31/05/20 05:53 PM
Joined: Nov 2018
Posts: 1,719
Northants, UK
TBM Offline
Talk Morgan Enthusiast
TBM  Offline
Talk Morgan Enthusiast

Joined: Nov 2018
Posts: 1,719
Northants, UK
Originally Posted by Arwyn Williams
Especially for an unleaded conversion. It's what I set mine to!

Arwyn


Thank you.


1972 4/4 4 seater
Too many ratty motorbikes
Re: What am I looking at [Re: PaulyG] #641518
31/05/20 08:00 PM
31/05/20 08:00 PM
Joined: Sep 2015
Posts: 137
Massachusetts, USA
M
morgan_75 Offline
L - Learner Plates On
morgan_75  Offline
L - Learner Plates On
M

Joined: Sep 2015
Posts: 137
Massachusetts, USA
I've been setting to 36deg total advance and then letting the initial advance be whatever it is.


'61 +4 DHC
'70 4/4
'80 4/4 4seater
Re: What am I looking at [Re: PaulyG] #642756
07/06/20 09:27 AM
07/06/20 09:27 AM
Joined: Oct 2017
Posts: 49
B
Biglewey Offline
Just Getting Started
Biglewey  Offline
Just Getting Started
B

Joined: Oct 2017
Posts: 49
Way back when I used to do car maintenance and tweaking I used the following method (mostly Ford engines with carburettors but used on other cars). It was a way of getting maximum advance and therefore maximum performance. It takes account of the weather (need to do it on a hottish day to be safe), other timing settings (vacuum and engine speed adv/retard), points gap and fuel quality.

This method was showed me by a very good car engineer and does really make a difference.

BUT, WARNING as you all know an engine that is pinking (pre-ignition - can provide an explanation if needed!) for more than a tiny amount or for than for any more than a very short time can severely damage itself. I also assume you know and can hear pinking? So, if you are in any way unsure use the book setting. use this method at your own risk....

Get the car filled with your regular supply of petrol, check distributor and points gap, carb condition and check for air leaks etc...

The worst case for pinking is normally when the engine is at low speed, maximum load (1500 - 2000 rpm and top gear) and enriched just after you have pressed to throttle pedal to the floor and the carb has given an extra squirt of fuel (lasts a couple of seconds). So this is something you wouldn't normally do any way.

Drive with the engine hot and do the low speed/top gear pedal to the floor and if the engine pinks retard a degree until it just doesn't pink any more. After setting like this you need to be listening for pinking in case things change but normally it will only be under those extreme conditions. To be honest I used to set the adv so it just gave a couple of pinks under that load but it was my car an my cost if things went wrong...

One thing I did notice that in them days petrol Octane rating did vary a bit so sometimes lower quality petrol caused more pinking other than extreme slow speed load/ accel - a good reason to add a degree or so of extra retard to be safe...

Used that method for years - in fact modern injection engines have "knock sensors" that in effect do the same thing - advance until they detect knocking and back off.

Its years since I've tweaked an engine like that and never on a Morgan so its old school - would value feedback from the more experienced Morgan owners/mechanics and perhaps performance guys as to whether this is a good method to get the max...

I cant say it enough that if you are unsure about this use the book settings. Ive only raised this out of (historic?) interest to see if its still valid (I have a GDI which I cant touch without specialist kit!).

Re: What am I looking at [Re: PaulyG] #642769
07/06/20 10:43 AM
07/06/20 10:43 AM
Joined: Apr 2014
Posts: 4,586
Llanelli
Ray Offline
Part of the Furniture
Ray  Offline
Part of the Furniture

Joined: Apr 2014
Posts: 4,586
Llanelli
Same way I always set cars up, till the modern ecu's arrived.


.+8 Now gone for a 1800 4/4. Duratec in bright yellow.
Re: What am I looking at [Re: PaulyG] #642807
07/06/20 01:12 PM
07/06/20 01:12 PM
Joined: Jul 2019
Posts: 1,097
L
Luddite Offline
Has a lot to Say!
Luddite  Offline
Has a lot to Say!
L

Joined: Jul 2019
Posts: 1,097
I remember fuelling up in back road France, after which the old thing pinked at almost any use of acceleration, until we were able to mix in some better quality petrol some time later.

As for book settings..I suspect they were printed relative to the fuel quality of the time..? I think that these days there are so many fuel types out there which the authors of the handbooks/manual may never have contemplated, if so then going by the book may be less than ideal...?

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