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Carb power piston spring [message #334281]

Sat, 30 June 2018 21:07

C Boyd

Messages: 2629
Registered: April 2006

Karma: 18

Senior Member

I am having trouble finding the OEM power piston spring hg for the mh. I believe it is light, around 3 hg? The Edelbrock replacement carb I am running starts and drives good but suffers from a very black tail pipe and 8 mpg. It has 5"hg springs in it and I am thinking it is going rich under cruise conditions. Anyone have any ideas or suggestions?

C. Boyd
76 Crestmont
East Tennessee

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Re: [GMCnet] Carb power piston spring [message #334370 is a reply to message #334281]

Sun, 01 July 2018 19:18

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

Try Dick patterson

On Sat, Jun 30, 2018 at 7:08 PM Charles Boyd
wrote:

> I am having trouble finding the OEM power piston spring hg for the mh. I
> believe it is light, around 3 hg? The Edelbrock replacement carb I am
> running starts and drives good but suffers from a very black tail pipe and
> 8 mpg. It has 5"hg springs in it and I am thinking it is going rich under
> cruise conditions. Anyone have any ideas or suggestions?
> --
> C. Boyd
> 76 Crestmont
> East Tennessee
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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Re: Carb power piston spring [message #334375 is a reply to message #334281]

Sun, 01 July 2018 20:12

Ken Burton

Messages: 10030
Registered: January 2004
Location: Hebron, Indiana

Karma: 10

Senior Member

If I remember correctly Larry Weidner researched and ordered a bunch of them a little over 10 years ago. Try calling Larry to see if my memory is correct.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

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Re: Carb power piston spring [message #334386 is a reply to message #334375]

Sun, 01 July 2018 21:13

Larry

Messages: 2875
Registered: January 2004
Location: Menomonie, WI

Karma: 10

Senior Member

Ken Burton wrote on Sun, 01 July 2018 20:12

If I remember correctly Larry Weidner researched and ordered a bunch of them a little over 10 years ago. Try calling Larry to see if my memory is correct.

Hey Ken,
Yup I did. But....that was about 10 years ago and have since switched to EFI, so got rid of most of the Carb stuff. I do recall that the correct power valve spring is the "RED" one. It is designed to come in at about 8" of vacuum. Because of the weight that our engines have to carry, any little rise or change in road elevation puts the vacuum to 9-10 in of vacuum having an effect on fuel mileage. The red spring will allow the primary metering rods to begin lifting in the jets at 8", and the correct rods (can't remember what they are anymore) richen's things up pretty quick keeping the combustion chamber cool. Just what I think I remember.

Best to contact Dick Patterson for correct spring and rods.

Larry

78 Royale w/500 Caddy
Menomonie, WI.

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Re: Carb power piston spring [message #334406 is a reply to message #334281]

Mon, 02 July 2018 05:49

C Boyd

Messages: 2629
Registered: April 2006

Karma: 18

Senior Member

Thank you gentlemen.

C. Boyd
76 Crestmont
East Tennessee

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Re: [GMCnet] Carb power piston spring [message #334434 is a reply to message #334375]

Mon, 02 July 2018 12:53

Kosier

Messages: 834
Registered: February 2008

Karma: 1

Senior Member

Cold I suggest getting hold of Cliff Ruggles. He wrote the latest book on
the Q-Jet. He's only 30 miles up the road from me, so I just drive up
when I need any thing. He's got a flock of parts and knowledge. Also a
really nice guy. I think I bought a bag with an assortment of power
piston springs the last time I was up.

Gary Kosier
77PB w/500Cad
Newark, Ohio

--------------------------------------------------
From: "Ken Burton"
Sent: Sunday, July 01, 2018 9:12 PM
To:
Subject: Re: [GMCnet] Carb power piston spring

> If I remember correctly Larry Weidner researched and ordered a bunch of
> them a little over 10 years ago. Try calling Larry to see if my memory is
> correct.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

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Re: Carb power piston spring [message #334455 is a reply to message #334281]

Mon, 02 July 2018 16:14

Chris Tyler

Messages: 458
Registered: September 2013
Location: Odessa FL

Karma: 7

Senior Member

76 Glenbrook

[Updated on: Mon, 02 July 2018 16:15]

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[GMCnet] Re: Carb [message #367914 is a reply to message #334281]

Thu, 09 December 2021 18:12

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

Set the timing back to 10-12 degrees and SLOW the Idle to 700RPM

On Thu, Dec 9, 2021 at 4:03 PM Hanson Email wrote:

> Working on a coach , 455 newly overhauled, approx 1000 miles, owner
> complained of dieseling when shutting off and low power at altitudes. We
> had
> the carb overhauled by shop that knows what he is doing, but overhauls what
> is there. The carb is the wrong number and has been modified to fit. And
> all
> ports are direct vacuum. Mostly does not diesel when vacuum removed from
> distributor. When we retard timing back from 9 degrees, it doesn't want to
> "rev" up. Also having trouble getting the motor to warm up even tho I put
> in
> a 195 thermostat. Chasing my tail here.
>
> Any thoughts would be appreciated.
>
> Dean hanson
>
> Fremont.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>

--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:

Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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[GMCnet] Re: Carb [message #367916 is a reply to message #334281]

Thu, 09 December 2021 18:14

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

Also check the distributor mechanical is free and not binding or
dragging and the throttle vac port is hooked to the distributor.

On Thu, Dec 9, 2021 at 4:12 PM Jim Kanomata wrote:

> Set the timing back to 10-12 degrees and SLOW the Idle to 700RPM
>
> On Thu, Dec 9, 2021 at 4:03 PM Hanson Email wrote:
>
>> Working on a coach , 455 newly overhauled, approx 1000 miles, owner
>> complained of dieseling when shutting off and low power at altitudes. We
>> had
>> the carb overhauled by shop that knows what he is doing, but overhauls
>> what
>> is there. The carb is the wrong number and has been modified to fit. And
>> all
>> ports are direct vacuum. Mostly does not diesel when vacuum removed from
>> distributor. When we retard timing back from 9 degrees, it doesn't want to
>> "rev" up. Also having trouble getting the motor to warm up even tho I put
>> in
>> a 195 thermostat. Chasing my tail here.
>>
>> Any thoughts would be appreciated.
>>
>> Dean hanson
>>
>> Fremont.
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>>
>
>
> --
> Jim Kanomata ASE
> Applied/GMC, Newark,CA
> jimk@appliedairfilters.com
> http://www.gmcrvparts.com
> 1-800-752-7502
>

--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:

Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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