MakeEverything
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| posted on 17/5/09 at 09:04 PM |
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Crossflow problems
Hi,
Ive just bought a car with a 1300 crossflow engine that ive finally sorted the timing on. It runs sweet for about 45 seconds then dies without
coughing or spluttering.
Symptoms are;
The Coil gets hot (too hot to touch)
Bogs down when throttle is touched
Has new plugs
Has new condenser & Points
Has new Distributor Cap
Leads are ok
Originally had a problem with the timing which we have reset as per TDC. this allows the engine to run now, but not for long.
Any ideas?
I Think the next step is to replace the leads (to be sure), the coil, and check all the wiring.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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will121
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| posted on 17/5/09 at 09:07 PM |
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is it a 12v coil or ment to be one with a 9v feed?
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omega0684
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| posted on 17/5/09 at 09:08 PM |
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coils knackered?
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MakeEverything
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| posted on 17/5/09 at 09:09 PM |
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quote:
Originally posted by will121
is it a 12v coil or ment to be one with a 9v feed?
Good question. It was installed by the previous owner, so ill need to check.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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MakeEverything
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| posted on 17/5/09 at 09:13 PM |
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quote:
Originally posted by omega0684
coils knackered?
But it runs. Wouldnt that stop it firing completely?
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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omega0684
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| posted on 17/5/09 at 09:15 PM |
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could be ok at first but stops firing as it gets too hot?
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02GF74
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| posted on 18/5/09 at 07:07 AM |
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coil get very warm - if you work out the power dissipated it is, from memory, equivalent of 40 W light bulb - try holding that in your hand! 
easy way to check coil.
measure primarey resistance 3 ohm is normal 12 V coil
1.5 ohm is 9 V coil meant to run with ballast resistor.
(you disconnect all leads to coil when measuring)
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a4gom
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| posted on 18/5/09 at 09:44 AM |
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might seem a daft question and i don't want to start a thread drift but how do you measure resistance?
Andy
Perfect planning prevents pi$$ poor performance!
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MakeEverything
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| posted on 18/5/09 at 10:11 AM |
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quote:
Originally posted by a4gom
might seem a daft question and i don't want to start a thread drift but how do you measure resistance?
By the number of guns theyve got 
Seriously, by using an Ohm Meter. Most miltimeters have resistance function, to measure the resistance between the two leads. This is measured in
ohms or "Ω".
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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rusty nuts
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| posted on 18/5/09 at 08:24 PM |
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Setting the timing at TDC will possibly be the cause of the engine "bogging down " when opening the throttle. Does the engine start
straight away after cutting out? If not check for spark and fuel if you have a spark. Using a ballast type coil without a resistor will cause the
condensor to fail but not normally after 45 seconds, check the points for blue contacts which is a typical sign of condensor failure. Might also be
worth checking the auto advance mechanism isn't siezed . If you can find one a Valencia distributor is a good cheap mod .
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mr henderson
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| posted on 18/5/09 at 08:34 PM |
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Another small possibilty, after the electical stuff warming up then breaking down stuff has been checked is that of a piece of debris in the float
chamber being drawn towards the feed to the jet, then blocking it.
Happened to me on an old Ford many years ago. Was convinced it was an electrical problem.
John
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MakeEverything
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| posted on 18/5/09 at 09:55 PM |
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quote:
Originally posted by mr henderson
Another small possibilty, after the electical stuff warming up then breaking down stuff has been checked is that of a piece of debris in the float
chamber being drawn towards the feed to the jet, then blocking it.
Happened to me on an old Ford many years ago. Was convinced it was an electrical problem.
John
hmmmmmmmmmm, we mentioned the floats a while back....
Bought new leads, condenser and plugs today. Put them in and the engine starts but surges. It holds up, and revs too but still surges.
Any ideas? It cant be a fuelling problem, but it might still be a timing issue?
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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MakeEverything
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| posted on 25/5/09 at 03:41 PM |
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UPDATE
Its sorted.
It was the coil after all. Managed to borrow an old one from Andybarbet and install it today. Fired up straight away, and had it ticking over for
about 20 minutes before taking it for a quick spin.
Still lower compression on cylinders 3 & 4, but as long as it runs! It felt grossly underpowered, and the brakes (although Drums all round)
were surprisingly very good.
Is it possible to swap the 1300 crossflow with the 1600 crossflow? I would imagine its the same block and could use the same mounts and
transmission...?
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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David Jenkins
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| posted on 25/5/09 at 03:44 PM |
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quote:
Originally posted by MakeEverything
Is it possible to swap the 1300 crossflow with the 1600 crossflow? I would imagine its the same block and could use the same mounts and
transmission...?
Almost exactly the same - about 1" taller. All fixtures and fittings identical.
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MakeEverything
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| posted on 25/5/09 at 07:20 PM |
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Cool. What about a 1600 head on a 1300 block?
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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David Jenkins
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| posted on 25/5/09 at 07:32 PM |
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It's the block that's taller, IIRC!
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MakeEverything
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| posted on 25/5/09 at 08:41 PM |
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quote:
Originally posted by David Jenkins
It's the block that's taller, IIRC!
Sorry,
What i meant was, will the 1600 head fit the 1300 block?
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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MikeRJ
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| posted on 25/5/09 at 08:47 PM |
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quote:
Originally posted by MakeEverything
Sorry,
What i meant was, will the 1600 head fit the 1300 block?
There are two types of crossflow head; the early ones had shallow combustions chambers in the head, the later ones are totaly flat. As long as the
replacement head is of the same type it will be ok. If you are running high lift cams, you should re-check piston clearances if you fit a head with
larger valves.
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MakeEverything
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| posted on 25/5/09 at 09:06 PM |
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quote:
Originally posted by MikeRJ
There are two types of crossflow head; the early ones had shallow combustions chambers in the head, the later ones are totaly flat. As long as the
replacement head is of the same type it will be ok. If you are running high lift cams, you should re-check piston clearances if you fit a head with
larger valves.
Cool, Thanks Mike. This is listed in the haynes book. Thanks.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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