Home » Public Forums » GMCnet » [GMCnet] Injection versus Carbs
Re: [GMCnet] Injection versus Carbs [message #74217 is a reply to message #74215] |
Wed, 17 February 2010 22:34 |
Kosier
Messages: 834 Registered: February 2008
Karma:
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Senior Member |
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Ummmmm..... I think Dick would frown on people getting their
little fingers into his carb rebuild jobs, I got my info from
Cliff Ruggles, who wrote the latest book on Q-Jets. He's only
about 30 miles north of me, so I just go up to see him for
info and parts. He's a drag racer, so he knows about modifying
Q-Jets.
I think all 76 and later carbs are built this way. Look under
the air cleaner gasket dead center in the front for a round plug
of aluminum. I never took any pictures cause I wasn't sure of
what I was doing.
Gary
----- Original Message -----
From: "Michael Lincoln" <mlincoln1@gmail.com>
To: <gmclist@temp.gmcnet.org>
Sent: Wednesday, February 17, 2010 11:01 PM
Subject: Re: [GMCnet] Injection versus Carbs
> Now that's what I've been looking for...do you have any
> pictures of this modification, Gary? Do you know if this works
> on the quadrajets fitted to the 403s?
>
> I need to get my carburetor rebuilt...I wonder if this fellow
> Dick Patterson can do what you describe.
>
> Best, Mike
> Born a Buckeye, but went to U of Mich, normally living in Utah
> 1978 Royale
>
>
> On Feb 17, 2010, at 10:46 PM, Kosier wrote:
>
>> Mike,
>>
>> On the late Q-Jets, there is an adjustable part throttle
>> screw,
>> which regulates the height of the primary needles in the jet.
>> Directly above it is an aluminum plug. Knock the plug out and
>> tap the hole for 3/8" thread. put a short socket head
>> set-screw in it. Take a fairly long 5/16" bolt, cut the
>> threads
>> off and slot the end. To change the mixture, you have to
>> stop, raise the engine lid, remove the bonnet from the carb,
>> remove the set screw and adjust the APT screw. Not as easy
>> as leaning the mixture on a plane, but you can't pull the
>> plane
>> to the side of the road and shut it off. Works for me!
>>
>> Gary Kosier
>> 77EII & 77PB
>> Newark, Ohio
>>
>> ----- Origial Message -----
>> From: "Michael Lincoln" <mlincoln1@gmail.com>
>> To: <gmclist@temp.gmcnet.org>
>> Sent: Wednesday, February 17, 2010 8:31 PM
>> Subject: Re: [GMCnet] Injection versus Carbs
>>
>>
>>> Has anyone tried a carb (a fixed carb, not an
>>> altitude-adjusting one) that has been specifically leaned for
>>> altitude? Does it detonate (too lean) at sea level? I'm
>>> thinking that one of the experienced tinkerers might know.
>>>
>>> In airplane flying in the Rockies one leans to peak rpm
>>> (fixed
>>> pitch prop), then richens to make the exhaust gas temp 50-100
>>> degrees cooler for takeoff. There's a big difference in
>>> power:
>>> running full rich (firewalled mixture control) compared to
>>> optimally leaned makes a huge difference in a high
>>> density-altitude situation. In the Utah mountains I once
>>> foolishly filled up a Cessna 152 (a little underpowered
>>> straight-tailed 152 from the 1950's) with avgas the night
>>> before, and then took off the next day. My friend and I flew
>>> the plane in ground effect for three miles to the edge of
>>> Bryce
>>> Canyon (airport was 9000 MSL), in order to throw ourselves
>>> off
>>> the edge and get some altitude beneath us. If I hadn't
>>> leaned
>>> for altitude I'm sure we would never have even gotten into
>>> ground effect. (By the time we got to the Grand Canyon 45
>>> min
>>> later, I had thermaled to 14,500 feet, and LA Center didn't
>>> believe our type aircraft--an 89 hp 152--given our
>>> altitude-encoding transponder rea
>>> ding, but that's what rising air will do for you).
>>>
>>> Therefore I suspect an optimal air *mass* to fuel mixture
>>> might
>>> make a significant difference in the GMC too. But, without
>>> the
>>> manual mixture control, it may be that the altered air/fuel
>>> volumetric mixture of the "mountain carb", when running at
>>> low
>>> altitude with the air mass much greater, would result in a
>>> too
>>> lean situation, with unacceptable detonation or at least
>>> higher
>>> cylinder head/EGT and wear in the valve train.
>>>
>>> Has anyone tried it?
>>>
>>> Mike
>>>
>>>
>>> On Feb 17, 2010, at 6:57 PM, Ken Henderson wrote:
>>>
>>>> Mike,
>>>>
>>>> Larry W. must be off line while travelling or he'd have
>>>> chimed
>>>> in: He got
>>>> all excited about an altitude compensated Quadrajet he came
>>>> across. He
>>>> spent a lot of time and his expertise on getting it
>>>> working --
>>>> for a while.
>>>> From what I recall of what he told me, it worked great as
>>>> long
>>>> as he kept
>>>> working on it. As if the QJ's not complicated enough,
>>>> imagine
>>>> what those
>>>> extra bellows, jets, needles, etc., would add. I don't
>>>> remember whether
>>>> he's running it right now -- I don't think so -- but I do
>>>> know
>>>> he's planning
>>>> on port injecting his Cad 500 ASAP.
>>>>
>>>> Ken H.
>>>> Americus, GA
>>>> '76 X-Birchaven
>>>> www.gmcwipersetc.com
>>>>
>>>>
>>>> On Wed, Feb 17, 2010 at 6:34 PM, Matt Colie
>>>> <mcolie@chartermi.net> wrote:
>>>>
>>>>>
>>>>>
>>>>> mlincoln wrote on Mon, 15 February 2010 16:31
>>>>>> Does anyone have actual experience with "splitting the
>>>>>> difference" in the
>>>>> Quadrajet enrichment to suit a MSL of 4500 to 5000 feet? I
>>>>> was once told
>>>>> that some old Detroit iron came with a "high altitude
>>>>> option"
>>>>> (possibly a
>>>>> re-metered carb?). A shop in ...
>>>>>
>>>> _______________________________________________
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[GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: Ron on Mon, 08 February 2010 11:08
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: k2gkk on Mon, 08 February 2010 12:35
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: Larry on Mon, 08 February 2010 22:00
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: Ron on Mon, 08 February 2010 14:31
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: tgeiger on Tue, 09 February 2010 09:51
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: USAussie on Mon, 08 February 2010 16:23
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Re: [GMCnet] Injection versus Carbs
By: Larry C on Thu, 18 February 2010 09:06
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: Chr$ on Mon, 08 February 2010 16:48
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Re: [GMCnet] Injection versus Carbs
By: Chr$ on Mon, 08 February 2010 16:49
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Re: [GMCnet] Injection versus Carbs
By: k2gkk on Mon, 08 February 2010 18:12
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: tgeiger on Wed, 10 February 2010 14:37
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Re: [GMCnet] Injection versus Carbs
By: ljdavick on Wed, 10 February 2010 14:45
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: Ron on Sat, 13 February 2010 16:14
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Re: [GMCnet] Injection versus Carbs
By: Surbo on Sat, 13 February 2010 17:45
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Re: [GMCnet] Injection versus Carbs
By: Ron on Sat, 13 February 2010 17:57
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: Larry on Mon, 15 February 2010 14:40
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Re: [GMCnet] Injection versus Carbs
By: mlincoln on Mon, 15 February 2010 15:31
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: mlincoln on Wed, 17 February 2010 19:31
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: Kosier on Wed, 17 February 2010 21:46
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Re: [GMCnet] Injection versus Carbs
By: mlincoln on Wed, 17 February 2010 22:01
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Re: [GMCnet] Injection versus Carbs
By: Kosier on Wed, 17 February 2010 22:34
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: mlincoln on Thu, 18 February 2010 08:38
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Re: [GMCnet] Injection versus Carbs
By: Kosier on Wed, 17 February 2010 20:57
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Re: [GMCnet] Injection versus Carbs
By: Surbo on Mon, 15 February 2010 14:09
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: jimk on Wed, 10 February 2010 22:18
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: psakw on Sat, 13 February 2010 21:58
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: g.winger on Thu, 18 February 2010 14:11
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Re: [GMCnet] Injection versus Carbs
By: Larry on Thu, 18 February 2010 15:08
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Re: [GMCnet] Injection versus Carbs
By: wally on Thu, 18 February 2010 15:33
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Re: [GMCnet] Injection versus Carbs
By: Larry on Fri, 19 February 2010 13:44
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Re: [GMCnet] Injection versus Carbs
By: wally on Fri, 19 February 2010 14:44
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Re: [GMCnet] Injection versus Carbs
By: Larry on Fri, 19 February 2010 19:05
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Re: [GMCnet] Injection versus Carbs
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Re: [GMCnet] Injection versus Carbs
By: Keith V on Sat, 20 February 2010 10:12
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Re: [GMCnet] Injection versus Carbs
By: GMC_LES on Sat, 20 February 2010 16:45
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Re: [GMCnet] Injection versus Carbs
By: WD0AFQ on Sat, 20 February 2010 17:35
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