| Re: [GMCnet] A couple 'issues' I'd like some advice on. [message #271019 is a reply to message #271016] |
Mon, 02 February 2015 09:10   |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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Bovee uses his finger over the spark plug hole
Erf
On Monday, February 2, 2015, Johnny Bridges wrote:
> Kerry -
> A quick n dirty TDC meter. Destroy a sparkplug by grinding out all the
> ceramic. Weld a nipple to the remaining shell. Slip a piece of clear
> tubing
> over the nipple. Now you can remove the plug from the No 1 cylinder,
> install the meter, and turn the engine close to tdc. Fill the opening with
> engine oil through the tube, and then rock the shaft across TDC and back.
> Highest level in the tube is TDC. When you're done, use your brake vacuum
> hand pump and tube to remove the oil as much as you can. It's gonna smoke
> when you restart it.
>
> --johnny
> --
> '76 23' transmode Norris upfit
> Braselton, Ga.
>
> "Sometimes I wonder what tomorrow's gonna bring when I think about my
> dirty life and times" --Warren Zevon
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--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: A couple 'issues' I'd like some advice on. [message #271225 is a reply to message #270901] |
Thu, 05 February 2015 04:35 |
spiffycar
Messages: 133
Registered: May 2010
Location: Brook Park ,Ohio
Karma: 1
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Senior Member |
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kerry pinkerton wrote on Sat, 31 January 2015 20:55IN PARK (it was getting late and I did not drive it today)
700 RPM 13.2
1300 RPM 12.0
2000 RPM 14.6
2500 RPM 15.7
3000 RPM 15.9
First ...I understand these were with your coach just sitting in the driveway. Some readings while driving it normally would give better info.
I'm not claiming to be an "expert" & don't know anything about how DPatterson does his rebuilds on the Carbs. I'm quite sure from what I've heard he does an outstanding job.
That said ,those AFR readings in the higher RPM's seem to be quite on the lean side. I'm not sure i fully agree with G Kosier's point on the idle mix. A bit rich into the transition off the pump-shot doesn't bother me ,but the quick leaning out going up into your power-band for a 403 kinda spooks me. I would seriously consider up sizing those primary jets if you can. Especially since you are towing with it. The carb may have not benn set up by DP with that in mind.
Load + Lean = Dead motor.
P.S.
14.7 AFR = BS...It's a mythical Ratio Made up by the EPA back in the 70's
Every Motor is different,Every type of fuel is different. Esp this ethanol blended crap they are selling us now.
Paul W L
76 Daytona Beach! ( EX-Palm Beach )
Cleveland,OH
& Current Card Carrying Pull A Part VIP Member
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