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Old 10-18-2004, 21:52   #1 (permalink)
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frown initial timing ATDC - why me !!

What are the consequences of setting your initial (static) timing to occur after top dead center (ATDC) and running in a new 270S cam in a clevo for a couple of minutes at 2500 rpm ??

I got confused with going left of TDC rather than right of TDC on the balancer - compression stroke !!

I stopped the engine after a few minutes because the front handbrake cable caught on FIRE !!

..anyway, apart from the fire, if i set the initial timing to 10-12 BTDC and fire her up again, I should be OK?

Me and my bad luck !!

Any comforting reply's would be appreciated, as i feel like kicking myself with a cowboy boot!! :( - :)
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Old 10-18-2004, 22:39   #2 (permalink)
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Re: initial timing ATDC - why me !!

Probably wouldn't have made a lot of power.... but I doubt it'd do any damage.

Possibly run a little hotter than normal is the only thing I can think of.
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Old 10-18-2004, 23:20   #3 (permalink)
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Re: initial timing ATDC - why me !!

Quote:
Possibly run a little hotter than normal is the only thing I can think of.

I guess thats why the handbrake cable caught on fire... so close to the tri-ys, glad i had an extinguisher handy :)

Any thoughts on the cam run in... by stopping well before the recommended 30min, would this cause any abnormal damage/wear in future. I have not restarted her yet ... only happened a couple of hours ago.

I'm hoping to reset the timing and give another 15-20 min at 2500rpm to properly bed in the lifters... any thoughts on that giving the following spec

CompCams 270S solid flat tappet and Crane solid lifters
.050: 224 - 224

also, could the retarded timing cause it to pre-ignite when ignition was killed ??

cheers
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Old 10-18-2004, 23:37   #4 (permalink)
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Re: initial timing ATDC - why me !!

Quote:
Originally Posted by xrgt
also, could the retarded timing cause it to pre-ignite when ignition was killed ??
That happens when its advanced too far
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Old 10-18-2004, 23:43   #5 (permalink)
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Re: initial timing ATDC - why me !!

... may have pre-ignited when ignition was killed due to the idle screw wound up a little for cam run in.

I don't think it was advanced... statically set to 10deg left of the TDC mark on the balancer is retarded isn't it?

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Old 10-19-2004, 01:04   #6 (permalink)
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Re: initial timing ATDC - why me !!

I had similar problem 2 weeks ago after i ran my cam in. I found it was firing right on top dead centre, and it ran on more the when advanced too far. Its now fine at 14 btdc and no run on.
Also, if it is acually firing anywhere to the left of the tdc mark, it is advanced.
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Old 10-19-2004, 01:12   #7 (permalink)
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Re: initial timing ATDC - why me !!

I ran in a new erson cam a few years ago and had timing retarded. I had bedded the cam in for about 10 minutes when I noticed the extractors were starting to glow cherry red. It required me to stand on brake and let clutch out in gear to stop the motor after ignition had already been turned off; it was pre igniting and running fine. After a couple of hours cool down I revised timing and wen't again.

That cam was in for around four years and when removed was in excellent condition.
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Old 10-19-2004, 02:16   #8 (permalink)
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Re: initial timing ATDC - why me !!

Quote:
Originally Posted by xdclevo
Also, if it is acually firing anywhere to the left of the tdc mark, it is advanced.
Acually just read what i wrote. Left would be retarded..
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Old 10-19-2004, 02:29   #9 (permalink)
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Re: initial timing ATDC - why me !!

I live in a block of units.... you should have seen the look on this lady that came down to complain about the noise - she works night shift

Having the timing retarted so much made it twice as loud at the run in RPM... and doing it in the garage made the building shake...

i told her to go and get a day job!
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Old 10-19-2004, 03:22   #10 (permalink)
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Re: initial timing ATDC - why me !!

You don't need to run a cam in at 2500rpm. Usually 1500rpm is plenty, as the only reason you want high-ish revs is to keep oil pressure high.

Rick.
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