Idle RPM's for 300 I-6

wildcard · Post by **wildcard** » Fri Dec 22, 2017 12:49 pm

I have a 300 I-6, 3 speed manual with electronic ignition.
I'm trying to get it running better so I would like to go back and get everything set back close to specs and adjust from there.
I have the timing at 10°.
What would be the ideal idle RPM's on this?
Once I get this, then I can start tweaking the timing and carb.
Thanks

1972hiboy · Post by **1972hiboy** » Fri Dec 22, 2017 1:45 pm

I would think in the 650-750 rpm neighborhood.

eggman918 · Post by **eggman918** » Fri Dec 22, 2017 4:14 pm

550 RPM for 1972 and earlier

wildcard · Post by **wildcard** » Fri Dec 22, 2017 4:22 pm

Ok. Thanks.

WarEagle · Post by **WarEagle** » Sat Dec 23, 2017 9:38 am

wildcard wrote:I have a 300 I-6, 3 speed manual with electronic ignition.
I'm trying to get it running better so I would like to go back and get everything set back close to specs and adjust from there.
I have the timing at 10°.
What would be the ideal idle RPM's on this?
Once I get this, then I can start tweaking the timing and carb.
Thanks

Is it a stock motor?

wildcard · Post by **wildcard** » Sat Dec 23, 2017 12:18 pm

Everything is stock except the electronic ignition.

Manny · Post by **Manny** » Sat Dec 23, 2017 8:05 pm

650-750 is where i would set it. With the 3 speed you have a little lee way..

WarEagle · Post by **WarEagle** » Wed Dec 27, 2017 9:26 pm

I'm at 680-700 rpm in park, 560-580 in drive w/o choke. I have a mild grind cam built for torque. power band is something like 800 rpm to 3000 rpm.

jzjames · Post by **jzjames** » Thu Dec 28, 2017 2:05 pm

My OLD 300 I6 is at 550.

Gives me a sense of how tuned up we are.

wildcard · Post by **wildcard** » Fri Dec 29, 2017 10:06 am

I haven't gotten far with mine. I got out and changed the rubber parts of my fuel line. I had to wire up a lever of some sort that's between my carb and choke to keep it from dropping too far when the choke releases. That was a week ago. Since then, it's either been too cold or my arthritis has been too bad. I sure hate cold weather.

Manny · Post by **Manny** » Sat Dec 30, 2017 10:47 pm

wildcard wrote: I sure hate cold weather.

No doubt.....

wildcard · Post by **wildcard** » Mon Jan 22, 2018 9:28 pm

OK, I got the RPM's set at 700.
I'm gonna start a new post on my carb.
Thanks for everyone's help and comments.

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