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Author Topic: oppy cyl head temp  (Read 2580 times)

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Offline PJG56

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oppy cyl head temp
« on: June 23, 2014, 07:43:16 pm »
What should a good running moded oppy run for cyl.head temp?
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Paul Guptill  (oppy) #238modX
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Offline Jim Knutson

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Re: oppy cyl head temp
« Reply #1 on: June 23, 2014, 08:34:11 pm »
I would say 400 to 420...depending on timing and fuel, should get it there.
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Offline Jeff McKelroy

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Re: oppy cyl head temp
« Reply #2 on: June 24, 2014, 01:19:26 am »
Quote from: PJG56 on June 23, 2014, 07:43:16 pm
What should a good running moded oppy run for cyl.head temp?

I had a hard time getting the heads to 370°F due to the inherent inefficiencies of a flathead engine on mine, and boy did she love to run.
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Offline PJG56

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Re: oppy cyl head temp
« Reply #3 on: June 24, 2014, 08:25:43 am »
Thats what i thought Jim, mine run between 420-450.
Last weekend was first time with new mychron, so i had no idea what temp was till know.
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Paul Guptill  (oppy) #238modX
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Offline Rooster

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Re: oppy cyl head temp
« Reply #4 on: June 24, 2014, 09:03:32 am »
Would be curious to see what happens if you fatten it up a bit.
I spent alot of time chasing head temps and revs. Lean it out, get it hotter and more top end. Sure thought I was getting some where!!
Fattened it back up, threw more gear at it and lap times dropped, speeds went up and power was better.
Head temps ran around 340-360.
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Offline redline

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Re: oppy cyl head temp
« Reply #5 on: June 24, 2014, 09:30:34 am »
And in Rooster's world, dropping lap times makes the chicks frisky. Not because of the increase in speed, but because they will get some corn sooner.
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Offline Rooster

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Re: oppy cyl head temp
« Reply #6 on: June 24, 2014, 06:06:32 pm »
Quote from: redline on June 24, 2014, 09:30:34 am
And in Rooster's world, dropping lap times makes the chicks frisky. Not because of the increase in speed, but because they will get some corn sooner.
:+1:
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