Technical Rebuilt engine won't fire

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Technical Rebuilt engine won't fire

Hi Marcus,

Low oil pressure
You stated that you put a 126 oil pump in your engine. Did you use the timing cover from your 499cc engine, or did you use a 126 timing cover? If you used the 500 cover, that is your problem.
Good oil pressure when cold and low oil pressure hot means either you have the issue with the 500 timing cover/126 oil pump or one of the following issues.
1. Camshaft to case bore clearance too big.
2. Crankshaft to front or rear main bearing clearance too big.
3. Connecting rods to crankshaft clearance too big.
4. Front oil seal steel ring worn.
5. Missing oil pickup seal.

Also I would disagree about checking the timing. You need to set the timing at idle, but also make sure that you see 18 degrees of advance at 3000 rpm, assuming your advance weights are free and not stuck or binding. If you see less than 18 degrees your engine will not make full power. Keep in mind that you drive your car at high rpm not at idle. If you see a lot more than 18 degrees at 3000 rpm then you risk pinging and maybe detonation. I would not be concerned about an extra 5 degrees or so at 3000 rpm.
You didn't throw a new set of rings and hone the cylinders while you had the engine apart?
You can call me if you want. 615-598-2454. I am in the Nashville area.
John
 
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John, this is an old thread that I came across when researching timing.
I think Al's comment re: importance or otherwise of dynamic timing is in the context of what was preventing this engine from starting.
My heap of praise for him refers to the fact that he was onto something there that whilst it may have been implicit in other discussions about engine timing, I had not previously seen described with the clarity that Al did.
So in the end I measured around the pulley not 13mm nor 25mm but 38mm and I have got myself a total of around 28 degrees of advance when the engine is around 75% (I guess) topped out.
 
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