Slow to turn over

Side valve, 803, 948, 1098., 1275 and Vizard mods

Slow to turn over

Postby Big Jim » Tue Nov 29, 2016 2:16 pm

I have a strange problem on my 1275 engine . Pull start .
Ignition off it turns over freely as normal.
Ignition on struggles to turn over , it sort of sound like too much compression , although it can't be .
Any ideas ?
Thanks Jim
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Re: Slow to turn over

Postby Panky » Tue Nov 29, 2016 4:04 pm

Ignition timing too far advanced maybe.
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Re: Slow to turn over

Postby emjay » Tue Nov 29, 2016 4:32 pm

Terminology. A full description of your symptoms would be better. A typical condition of too much advance is the engine rotates a bit and then abruptly stops or slows as the ignition tries to drive the piston the wrong way. Is that what it's doing or is it a slow but steady crankshaft rotation?
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Re: Slow to turn over

Postby Big Jim » Tue Nov 29, 2016 4:55 pm

I have tried the ignition in all sorts of places . Am I right in thinking that unless it tries to fire it doesn't make alot of difference where the ignition is ?
Here is some video . Four bursts
Ign off
Ign on
Ign off
Ign on

The battery is new , oversized and charged .,

https://youtu.be/YjSjXEVsSGc
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Re: Slow to turn over

Postby Panky » Tue Nov 29, 2016 6:13 pm

Just edited my post, I meant to say ignition timing - but I suspect you guessed that.
It does sound advanced though, unless something is pulling the voltage down when the ignition is on.
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Re: Slow to turn over

Postby Big Jim » Wed Nov 30, 2016 4:20 pm

Next clue...
I pulled off all the plug leads and it spins over as it should with the ign on , so does that point to timing and not voltage drop ? It will always usually start as is , but in this cold weather it struggles, when warm it runs fine .
I have moved the distributor forward and backwards and it seems to make no difference and it still turns lumpy/slow .
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Re: Slow to turn over

Postby Panky » Wed Nov 30, 2016 4:36 pm

You've isolated the problem to the ignition so I would say yes it is a timing issue. Try a good twist of the dizzy clockwise and see what happens, but first double check earth strap and starter fixing bolts just to make sure it's not an earthing fault.
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Re: Slow to turn over

Postby Big Jim » Sat Dec 03, 2016 12:41 pm

All seems to be good now . It seemed to benefit more from a twist on the dizzy anticlockwise . Not sore what really cured it as I fiddled with the carb and the dizzy and it is now running very sweet , beter than ever.
Thanks for your suggestions .
Jim
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Re: Slow to turn over

Postby Panky » Sat Dec 03, 2016 5:05 pm

Dohhh, that's what I meant :oops: I must disclocksic :roll:
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Re: Slow to turn over

Postby The vast minority » Sat Dec 03, 2016 6:48 pm

Static timing with a simple 12 volt bulb and a bit of wire is your friend when it's miles out.
How did it get so far out?
Al
:kermit: Nothing finer than a Morris Minor
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Re: Slow to turn over

Postby Big Jim » Sat Dec 03, 2016 8:17 pm

It's a new distributor . It has always been awkward to start . I can't see how its easy to see the timing marks , so I have used the trial and error method and played around with different settings .
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Re: Slow to turn over

Postby geezer » Mon Dec 05, 2016 7:04 pm

Big Jim,

I see you had asked a question about the Isuzu Trooper starter last month. Here is a link to my journal with pics. I have one on my Morris and it spins the engine nicely. I got mine on eBay for $35 USD

http://www.mgexp.com/journal/geezer
Give an Englishman a car and he'll make it leak
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Re: Slow to turn over

Postby Big Jim » Mon Dec 05, 2016 7:32 pm

Thanks , I did see your starter swap , but I could not see one over here at the time .
Jim
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Re: Slow to turn over

Postby geezer » Tue Dec 06, 2016 2:45 pm

Give an Englishman a car and he'll make it leak
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