Autolite 4100 Tips
Elder User
Joined: Mar 2004
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From: Klamath Falls OR
That Summit carb was started off by Holley back in the early 90's. Summit bought it from Holley but they are not Holley made! Yes, a knock off the 4100's. Yes the 4100 is a single inlet but if you look, it feeds both float bowls (kind of like an Ed, Q Jet or any other). That is all an appearance or cosmetics. Same but different.
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Lead Driver
Joined: Mar 2008
Posts: 7,193
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From: Near Los Angeles
That Summit carb was started off by Holley back in the early 90's. Summit bought it from Holley but they are not Holley made! Yes, a knock off the 4100's. Yes the 4100 is a single inlet but if you look, it feeds both float bowls (kind of like an Ed, Q Jet or any other). That is all an appearance or cosmetics. Same but different.
It is a known fact the Holley paid Ford for many years to copy their annular fuel discharge used by the autolite 4100. You can't say that a carb that has the exact same boosters as the 4100 was started by holley; or do you mean with a fuel inlet for either float bowl?
Any carb with two float bowls and one inlet both bowls will be fed by the one inlet. Where else would it come from?
BTW, Quadrajets only have one float bowl.
Elder User
Joined: Mar 2004
Posts: 747
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From: Klamath Falls OR
It is a known fact the Holley paid Ford for many years to copy their annular fuel discharge used by the autolite 4100. You can't say that a carb that has the exact same boosters as the 4100 was started by holley; or do you mean with a fuel inlet for either float bowl?
Any carb with two float bowls and one inlet both bowls will be fed by the one inlet. Where else would it come from?
BTW, Quadrajets only have one float bowl.
Any carb with two float bowls and one inlet both bowls will be fed by the one inlet. Where else would it come from?
BTW, Quadrajets only have one float bowl.
The summit carbs are not made by Holley
Laughing Gas
Joined: Jan 2012
Posts: 1,106
Likes: 25
Jet size doesnt effect idle mix. Your idle mix screws do! As for the high idle. You need to pull the carb. On the bottom of the carb. There is a small screw that adjust the secondaries. You cant miss it I have a feeling that they are open to far. Thats why your idle wont come down. You should be able to kill the engine with the idle screw.
So to set the secondary... It should be a 1/4 to 3/4 turn from the bottom in. So adjust it out (to where the butterflies just touch the throat). Now when the screw touches the lever. Turn it 1/4 to 3/4 of a turn in. That should fix it!
So to set the secondary... It should be a 1/4 to 3/4 turn from the bottom in. So adjust it out (to where the butterflies just touch the throat). Now when the screw touches the lever. Turn it 1/4 to 3/4 of a turn in. That should fix it!
I will say one thing tho, when the butterfly's hang up i have a Lil bit of gap between the lever and the screw you mentioned.
Thats how i figured out the butterfly's weren't shutting all the way, i seen that gap between the two.
My idle screw is out as far as it will go, so i cant get it to lower the idle, unless i pull on the throttle shaft, then it will come down a lil bit.
So i think i have more of a butterfly problem, and maybe booster to.
Elder User
Joined: Mar 2004
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From: Klamath Falls OR
I will check that when i pull it.
I will say one thing tho, when the butterfly's hang up i have a Lil bit of gap between the lever and the screw you mentioned.
Thats how i figured out the butterfly's weren't shutting all the way, i seen that gap between the two.
My idle screw is out as far as it will go, so i cant get it to lower the idle, unless i pull on the throttle shaft, then it will come down a lil bit.
So i think i have more of a butterfly problem, and maybe booster to.
I will say one thing tho, when the butterfly's hang up i have a Lil bit of gap between the lever and the screw you mentioned.
Thats how i figured out the butterfly's weren't shutting all the way, i seen that gap between the two.
My idle screw is out as far as it will go, so i cant get it to lower the idle, unless i pull on the throttle shaft, then it will come down a lil bit.
So i think i have more of a butterfly problem, and maybe booster to.
So leave the screws loose and make sure it can close, without force. If so, tighten down the screws
Laughing Gas
Joined: Jan 2012
Posts: 1,106
Likes: 25
Sounds like you need to address that first! You might have to loosen up the screws on the butterflies. Make sure the 2 dimples face toward the center of the carb and that the divot faces up towards the throat of the carb. Also one set of the butterflies (the pair) have a tapper across the face... Those belong to the primary side of the carb.
So leave the screws loose and make sure it can close, without force. If so, tighten down the screws
So leave the screws loose and make sure it can close, without force. If so, tighten down the screws
All this new info has me curious as to where i went wrong.
Elder User
Joined: Mar 2004
Posts: 747
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From: Klamath Falls OR
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Lead Driver
Joined: Mar 2008
Posts: 7,193
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From: Near Los Angeles
Sounds like you need to address that first! You might have to loosen up the screws on the butterflies. Make sure the 2 dimples face toward the center of the carb and that the divot faces up towards the throat of the carb. Also one set of the butterflies (the pair) have a tapper across the face... Those belong to the primary side of the carb.
So leave the screws loose and make sure it can close, without force. If so, tighten down the screws
So leave the screws loose and make sure it can close, without force. If so, tighten down the screws
Sometimes my replies sound harsh. I don't mean for them to be. I just speak frankly. You didn't mis speak. It is simply difficult sometimes to explain things in a forum. Was it the Holley 4010 that so closely copied the 4100?
Could you please explain what you mean by 'have a taper across the face'? Thanks.
Elder User
Joined: Mar 2004
Posts: 747
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From: Klamath Falls OR
Sometimes my replies sound harsh. I don't mean for them to be. I just speak frankly. You didn't mis speak. It is simply difficult sometimes to explain things in a forum. Was it the Holley 4010 that so closely copied the 4100?
Could you please explain what you mean by 'have a taper across the face'? Thanks.
Could you please explain what you mean by 'have a taper across the face'? Thanks.
Ok Holley 4010's & 4011's are very close to the Autolites with a few cool upgrades... So to speak. Dual power valves, dual fuel inlet, adjustable VS (change with springs). 4010's are vacuum secondaries and are double pumpers. 4011's are spread bore carbs. They are simple but the DP's are cool.
http://www.holley.com/data/TechServi...ded%20View.pdf
http://www.holley.com/data/TechServi...ded%20View.pdf
Elder User
Joined: Mar 2004
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From: Klamath Falls OR
All the 4100's I have seen have a tapper across the first 1/3 of the one side of the face on the butterfly. I think they did it for better air flow across it. Those are used in the Primary side. I'll take a picture so you can see it. Then it will make since
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Lead Driver
Joined: Mar 2008
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From: Near Los Angeles
No problem... I need to watch how I say things too. I have a lot of people who fallow me and I have to make sure That I'm correct.
Ok Holley 4010's & 4011's are very close to the Autolites with a few cool upgrades... So to speak. Dual power valves, dual fuel inlet, adjustable VS (change with springs). 4010's are vacuum secondaries and are double pumpers. 4011's are spread bore carbs. They are simple but the DP's are cool.
http://www.holley.com/data/TechServi...ded%20View.pdf
http://www.holley.com/data/TechServi...ded%20View.pdf
Ok Holley 4010's & 4011's are very close to the Autolites with a few cool upgrades... So to speak. Dual power valves, dual fuel inlet, adjustable VS (change with springs). 4010's are vacuum secondaries and are double pumpers. 4011's are spread bore carbs. They are simple but the DP's are cool.
http://www.holley.com/data/TechServi...ded%20View.pdf
http://www.holley.com/data/TechServi...ded%20View.pdf
How funny that I never noticed the 4100 p.butterflies are tapered!!
I am now having difficulty getting my secondaries to open. When I got the carb I noticed the previous owner had clamped shut the little vacuum tube that juts down into the secondary booster. I replaced it with an open one, and am now wondering if that was a mistake. I have a spare air horn with only the one tube, and I'll try using that one to see if there is a difference.
Just out of curiosity, the cfm for the 4010, is that 600?
Thanks. k.
Elder User
Joined: Mar 2004
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From: Klamath Falls OR
600 & 750 for the 4010
650 and 800 for the 4011
They also made a 2010 2bbl
I forgot.... You can adjust the floats from the outside. So there are some advantages to the Holley. But dont down play the 4100 (super simple). Both great carbs but Holleys have more adjust-ability.
650 and 800 for the 4011
They also made a 2010 2bbl
I forgot.... You can adjust the floats from the outside. So there are some advantages to the Holley. But dont down play the 4100 (super simple). Both great carbs but Holleys have more adjust-ability.
Elder User
Joined: Mar 2004
Posts: 747
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From: Klamath Falls OR
When you build carbs for people... You have to pay attention to the fine details, like I do LOL
Laughing Gas
Joined: Jan 2012
Posts: 1,106
Likes: 25
OK need further advice.
I took off the carb right now, and i just got to thinking.
I bought a 4100 off a guy on eBay, it was a pony carb, in great shape minus the fact the dude over tightened the nuts and shattered the base on it.
So i bought another carb, and took all the guts out of the pony carb, and installed it in the other base.
So with the pony carb butterfly's in the other base,that might be my issue?
And on the little set screw, it was screwed in 3 turns.
The pony carb id tag is what i had, so i have no idea what the id is on the other one, but the other carb had boosters kd prim, and b secondary, whats the difference between the b booster and the ab that came from the pony carb?
I'm thinking about putting back all the org equip back on the good base and see if that helps.
I took off the carb right now, and i just got to thinking.
I bought a 4100 off a guy on eBay, it was a pony carb, in great shape minus the fact the dude over tightened the nuts and shattered the base on it.
So i bought another carb, and took all the guts out of the pony carb, and installed it in the other base.
So with the pony carb butterfly's in the other base,that might be my issue?
And on the little set screw, it was screwed in 3 turns.
The pony carb id tag is what i had, so i have no idea what the id is on the other one, but the other carb had boosters kd prim, and b secondary, whats the difference between the b booster and the ab that came from the pony carb?
I'm thinking about putting back all the org equip back on the good base and see if that helps.