timing information for a meastro

[maestro vans]

Does anyone know what the timing adjustment is for a 1300cc van 1989
In my haynes manual it quotes timing as 12degrees BTDC @1500RPM. I've checked the timing and it reads 16degrees BTDC increase throttle and it retards further. Which one is correct please?

[e692wtt]

My Haynes manual for the Maestro says 12 degrees BTDC at 1500rpm, but this is only up to 1986... I would guess for the car (or van) to use Unleaded (and yours, if it is a 1989 model, will be able to) the timing would need to be retarded so 16 degrees BTDC at 1500rpm sounds reasonable... I guess the Van runs ok but you want reassurance? Others on this Forum will have the later Haynes manual to confirm figures for you...

And yes, the timing will retard as the engine revs are raised, to give the mixture time to burn, so don't worry about that. :)

Glad you got the Van's brakes sorted. by the way (I saw it on another post).

[H48HPE]

definitive answer from the rover manual:

low compression engine:

at 1500 rpm 9 degrees +/- 1 (with vacuum disconnected)

High compression:

at 1500 rpm 14 degrees +/- 1 (with vacuum disconnected)

Low compression engine have an engine number starting with: 12HE43 or 12HE79

High compression engines have an engine number starting with: 12HE76 , 12HE77 , 12HE78 or 12HE94


hope that helps

Andy

[E_T_V]

I believe the low compression engine is the one fitted to the HLE to give better fuel economy. The van I think will be the high compression one.

Are those figures quoted for Leaded engines? If so you'll need to add about 4 degrees to the figures to run on unleaded.

So the timing seems about right. My guess your problems will be resolved by a good engine tune up. (see other thread)

[G Force]

Hi all. The Ignition timing Should advance with an increase in engine speed. Generally speaking when engines that were originally designed to run leaded fuel had to be converted to run unleaded, the ignition timing had to be retarded by a few degrees. 16 degrees advance is too much and should be retarded to 12 degrees if the engine is unleaded HC.

Cheers Gary :)

[H48HPE]

The figures I quoted were based on an engine designd to run on 95ron (unleaded) for cars & vans 1988 onwards.

[e692wtt]

The Ignition timing Should advance with an increase in engine speed.

I could bluff, like Captain Mainwaring, and say I wondered when anyone would spot that one, but won't... the joys of programmed ignition mean I've not had to think about this for over 7 years, oops... always get it wrong. :censored: Of course the timing advances as engine rpm rise...

D'oh! :banghead: