motorcraft or holley
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From: Kissimmee
motorcraft or holley
Hey all! I was wondering which is a better carb a motorcraft 2100 or a holley 4412. Can anyone tell me what the cfm is on each of these carbs. Or tell me if there is difference in performance. I have a 1973 f250 2wd. 360 cid c6, runs like a scalded dog ford truck. Any help will be appreciated. Thanks,
Chad
Chad
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Joined: Mar 2004
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From: Union, Washington
The Motorcraft 2100 is a rip off a of a Holley 2300 series carbs. The Holley is better. The Motorcrafts are 300 to 350 CFM. The Holleys have carbs from just over 300 CFM to 650CFM in the 2V. The 350 ranges is gonna be best for you application.
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From: Union, Washington
The 500CFM will work for a stock 360, since they have a 4400 RPM limit. They cme with the 350 versions. However you will sacrifice some low end responce with that big of throttle bores. Best bet is to find a 390 4 barrel manifold and go with a 500 to 550CFM vacuum secondary 4 barrel. Then you get the good low end response from the small primaries and the breathing at big end with the 4 throats open.
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From: Brighton, Colorado
Originally Posted by Bear 45/70
However you will sacrifice some low end responce with that big of throttle bores.
I had experience with both the 500cfm holley and 350cfm motorcraft. I liked the bottom end better than the top although I could tell the 350 ran out where the 500 would keep going. I went to a 4bbl on my old 390. Never could get anywhere as the 390 was stock and ailing and really couldn't use all the 4bbl would dish out.
Good luck.
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Joined: Mar 2003
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From: Phoenix Az, by way of Fre
I have a 2wd '69 F250 w/ fresh 390 and fresh C6.
I swap'd the stock motorcraft 2100 for the Holley 4412(500cfm) last summer.
I lost no low end(as near as my butt-o-meter can tell)... it will actually spin the tires more easily now, which, I believe is a sign of increased low end.
Throttle response is much better(noticed immeadiatly) with the 500cfm carb than with the old 2100. Night and day difference.
Initially I thought I was getting better mpg with the 4412, but, over the year I've been averaging the same old 10mpg that the 2100 was good for.
The 2100 had been rebuilt in an attempt to fix several issues... I then plunked down for the 4412 and very difficult hot start issues, dieseling and part throttle detonation all went away... drivability was much improved.
Top end... it'll pull much harder up over, say ~3000rpm, but to be honest I just tool around 99% of the time... so, that was not important to me... I'd be suprised if the truck see's over 3000rpm once a month...
If I were to ever purchase another old truck, one of the first things I'd do is toss the old 2100 for a new 4412.
I swap'd the stock motorcraft 2100 for the Holley 4412(500cfm) last summer.
I lost no low end(as near as my butt-o-meter can tell)... it will actually spin the tires more easily now, which, I believe is a sign of increased low end.
Throttle response is much better(noticed immeadiatly) with the 500cfm carb than with the old 2100. Night and day difference.
Initially I thought I was getting better mpg with the 4412, but, over the year I've been averaging the same old 10mpg that the 2100 was good for.
The 2100 had been rebuilt in an attempt to fix several issues... I then plunked down for the 4412 and very difficult hot start issues, dieseling and part throttle detonation all went away... drivability was much improved.
Top end... it'll pull much harder up over, say ~3000rpm, but to be honest I just tool around 99% of the time... so, that was not important to me... I'd be suprised if the truck see's over 3000rpm once a month...
If I were to ever purchase another old truck, one of the first things I'd do is toss the old 2100 for a new 4412.
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Post Fiend
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From: Union, Washington
Originally Posted by cleanLX
I lost no low end(as near as my butt-o-meter can tell)...
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Elder User
Joined: Mar 2003
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From: Phoenix Az, by way of Fre
Originally Posted by Bear 45/70
The butt-o-meter is the biggest liar there is when it comes to sensing true preformance increases. Time slips are the only true way to tell.
the (butt-o-meter) was throw in for smiles.
Dyno's are neat too, but the track will always be the tell tale of a well put together combo.
Cheers.
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Joined: Jan 2004
Posts: 169
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From: Hesperia CA
I like the 4412. It wasn't easy but I've got one running on a 140 inch Pinto motor. Hits 8 grand twice a lap.
I did experiment with the 350 CFM Holley (7448) thinking I might get better throttle response but it didn't happen. Couldn't really tell ya about bottom end performance on either tho. They could both get on the track .....
I've found 350 sized Holley's in the junkyards altho they aren't 7448's. They'll have different boosters, side hung floats insead of center hung, etc. Street carbs basically where the 4412 and 7448 are performance oriented.
I did experiment with the 350 CFM Holley (7448) thinking I might get better throttle response but it didn't happen. Couldn't really tell ya about bottom end performance on either tho. They could both get on the track .....
I've found 350 sized Holley's in the junkyards altho they aren't 7448's. They'll have different boosters, side hung floats insead of center hung, etc. Street carbs basically where the 4412 and 7448 are performance oriented.
Post Fiend
Joined: Mar 2004
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From: Union, Washington
Originally Posted by pntrbl
I like the 4412. It wasn't easy but I've got one running on a 140 inch Pinto motor. Hits 8 grand twice a lap.
I did experiment with the 350 CFM Holley (7448) thinking I might get better throttle response but it didn't happen. Couldn't really tell ya about bottom end performance on either tho. They could both get on the track .....
I've found 350 sized Holley's in the junkyards altho they aren't 7448's. They'll have different boosters, side hung floats insead of center hung, etc. Street carbs basically where the 4412 and 7448 are performance oriented.
I did experiment with the 350 CFM Holley (7448) thinking I might get better throttle response but it didn't happen. Couldn't really tell ya about bottom end performance on either tho. They could both get on the track .....
I've found 350 sized Holley's in the junkyards altho they aren't 7448's. They'll have different boosters, side hung floats insead of center hung, etc. Street carbs basically where the 4412 and 7448 are performance oriented.
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From: Kissimmee
I appreciate all of the answers and advice. But the reasoning behind the question was, I was was trying to avoid the 4 bbl. swap. I'm sure you all know how bad an fe manifold swap can be. I was just looking for a little more performance. It just feels like this carb isn't doing the trick and I figured it is ready for its third rebuild so why not go with a new one. I don't know what low end torque feels like with this carb, it backfires when I get on it until it get to higher rpms. Thanks to all!
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Joined: Mar 2003
Posts: 541
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From: Phoenix Az, by way of Fre
sounds like any "new" carb is going to be of benifit.
I rebuilt my 2100 2 times in an attempt to fix drivability issues... in the end a "new" carb was the ticket.
Mine did not backfire at low rpm, but it would stumble and hesitate, and try to stall like nobodys buisness.
Oh, I grab'd a phenolic spacer from canton(i think) as well as the 4412.
Good luck.
I rebuilt my 2100 2 times in an attempt to fix drivability issues... in the end a "new" carb was the ticket.
Mine did not backfire at low rpm, but it would stumble and hesitate, and try to stall like nobodys buisness.
Oh, I grab'd a phenolic spacer from canton(i think) as well as the 4412.
Good luck.
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