Issues setting my ignition timing

dllubin said:
I checked but no photos. However, it is a really simple job and taking it to a machine shop only for that would be a gross overkill. Just get an M8 x 1.25 tap, a couple of M8 x 1.25 set screws of your choice, and a little pipe joint compound and have at it. Since the manifold is already off, it should only take a few minutes. Having a shop vac to suck out any metal shards that fall in could come in handy if necessary.
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Are these the holes that you are referring to? I honestly never noticed that nothing went into those two holes and the gasket has the corresponding holes. Between cylinders 1&2 there's the same hole.
 

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dllubin said:
I checked but no photos. However, it is a really simple job and taking it to a machine shop only for that would be a gross overkill. Just get an M8 x 1.25 tap, a couple of M8 x 1.25 set screws of your choice, and a little pipe joint compound and have at it. Since the manifold is already off, it should only take a few minutes. Having a shop vac to suck out any metal shards that fall in could come in handy if necessary.
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I would only ask the machine shop since it's there anyway being checked over for cracks and flatness.
 
petex19 said:
Are these the holes that you are referring to? I honestly never noticed that nothing went into those two holes and the gasket has the corresponding holes. Between cylinders 1&2 there's the same hole.
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The second link I posted has complete pics and shows the tools needed…
 
dllubin said:
My dual DCNF Sprint manifold had the water passages built in but had no plans to use them. I tapped the water ports on the head and installed M8x1.25 set screws with RectorSeal to prevent any leaks.

I must have missed the timing set at 39 degrees. For my engine, I never found going past about 34 degrees gained anything. I'm surprised pre-ignition wasn't a problem at 39 degrees under load.
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My recollection was wrong, he was running much more timing with the Volvo/Saab systems he was working with. They integrated knock sensors but the system didn’t work properly in terms of retarding or it was incapable of retarding enough.

I think your point around 33° all in is likely the limit of what this motor can take given the head design. 30° is the OE max with the Bosch distributor.


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petex19 said:
Are these the holes that you are referring to? I honestly never noticed that nothing went into those two holes and the gasket has the corresponding holes. Between cylinders 1&2 there's the same hole.
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Sure looks like #4 intake has coolant going into it....
 
SuperTopo said:
Sure looks like #4 intake has coolant going into it....
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It does have coolant puddled, but it could just be from disassembly.

However, if it was leaking coolant under the gasket it would certainly explain #4 being steam scoured if the head shows no cracks or warpage.

If it was just a gasket or torque down failure it would be another example of the simplest things catching us up.
 
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