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Re: Testing Daytona Universal Carburetor UN2
tom moore #1342707 Sat Jan 18 2020 03:47 PM
Joined: Feb 2016
Posts: 199
C
Gabriel Sandoval
Thanks Tom. Thanks Gord.

Re: Testing Daytona Universal Carburetor UN2
ClassicsR4Me #1342713 Sat Jan 18 2020 04:09 PM
Joined: Apr 2005
Posts: 10,049
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Your every day man testing will be of benefit to the thousands of hobbyists that don’t have access to machine shops with dynos and hundreds of thousands of dollars in test equipment. Or, for that matter, the knowledge to use them. Keep good records and post frequently to keep interest up. The more miles you put on the more relevant your “test” will be. Don’t hesitate to post the bad (if any) along with the good. You’ve got a good start. Thanks


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2) “Emily”
‘39 Dodge Businessmans Coupe “Clarence”



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Re: Testing Daytona Universal Carburetor UN2
ClassicsR4Me #1342720 Sat Jan 18 2020 04:39 PM
Joined: Sep 2013
Posts: 1,187
M
'Bolter
Gabriel, another "Thanks" for taking the time to test and report. I bought a nos Zenith O-10355 (originally sold as a replacement for a 1937 ~ 1942 Chevrolet 216) from carbking to run on my 1951, 216 powered 3600. I have only praise for this carb. All that said, I recently added a 261 engine to the flock that will likely replace the 216 currently in the '51. It has the factory Rochester and I've been on the lookout for better carburetor. Your review could cause another Daytona carb to be installed when/if the 261 hits the road.

Added in edit: just been rereading earlier post and thought I'd add a test suggestion. As you're tuning for power it's easy to rely on the "seat of the pants" dyno. Most of us do. To add another test try this. Find a quite stretch of road, either make marks on the road or just identify a stop/start point with available landmarks that allow for precise identification within a foot or so. Then set your smart phone (or stop watch) to timer function. Drive at a steady (not accelerating at all) speed of say 40 mph and when you hit your first mark, put the accelerator to the floor and start the timer. Hold it there till you hit your second mark and stop the timer. Record the time and make notes on speed, wind, temp and humidity.

You now have a baseline to compare to when making adjustments that affect power. Although not likely to be worth the trouble with our truck and power levels you can find charts to adjust weather factors back to your baseline figures so you'er doing apple to apples comparisons.

Now make one change (only), go test and time, record all results, then repeat and report smile

If you really want to be thorough put the Rochester back on and do a test run, then one with the Daytona.

RonR

Last edited by moparguy; Sat Jan 18 2020 11:03 PM.

1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A



Re: Testing Daytona Universal Carburetor UN2
moparguy #1342724 Sat Jan 18 2020 05:09 PM
Joined: Feb 2016
Posts: 199
C
Gabriel Sandoval
I'm glad to do it. The gentlemen on this site have helped me countless times when I've needed advice, with their years of experience. I'm happy to give back in this small way. That 261 is a great engine, I lucked out when I bough my 46 chevy, I thought I had a 235, but upon closer inspection found out I had a 261. I was very happy and am more than content with its performance. The Rochester B is an excellent carb, with its faults of course, but still gives stellar performance. When other stovebolters spoke of the Zeniths superiority, I wanted to look more into it. I've been told they fetch a handsome price, so of course when I learned of this near exact copy, and manufactured new, I knew I had to give it a try. I'm glad I did. It is brand new and working great, we'll see with time how it holds up. Ill try to keep everyone posted.

Re: Testing Daytona Universal Carburetor UN2
ClassicsR4Me #1344541 Sat Feb 01 2020 05:28 AM
Joined: Feb 2016
Posts: 199
C
Gabriel Sandoval
1/31/2020 Update: Just finished filling up my tank after putting 108 freeway miles on my pickup. It's been running great. I ended up putting 9 gallons of gas to the brim which averages out to 12 mpg's. This was driving at a pretty constant 50 mph with some average grade changes. I also did many full throttle pulls to test the high end power. I'm quite content with its power output. I still feel that perhaps the Rochester was a little almost unnoticeably better on the high end power, but the overall performance of the UN2 with its great idle, and low end performance more than make up for that. I also enjoy its performance right after cold startups, I don't have to warm up the engine as long to get smooth drive offs even when cold. Will update when I do a reasonable amount of city driving to average out its gas consumption.

Re: Testing Daytona Universal Carburetor UN2
ClassicsR4Me #1344561 Sat Feb 01 2020 03:17 PM
Joined: Jan 2013
Posts: 1,675
S
'Bolter
Gabriel, if you are willing to weld in a 18mm bung in your exhaust down pipe, I will send you my hand held wide band to monitor air fuels.
Steve


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: Testing Daytona Universal Carburetor UN2
sstock #1344604 Sat Feb 01 2020 11:11 PM
Joined: Feb 2016
Posts: 199
C
Gabriel Sandoval
Hi Steve, thanks for the offer. I would have no problem welding the adapter, but do you think it would make such a big difference in the outcome? It might be worth it even if I got one more mile per gallon, but from what I've heard, 12 Mpg's is pretty much the accepted fuel economy of these engines. Did it help you on your 261? What's your average mpgs?

Re: Testing Daytona Universal Carburetor UN2
ClassicsR4Me #1344730 Sun Feb 02 2020 10:48 PM
Joined: Jan 2013
Posts: 1,675
S
'Bolter
I didn't bother welding in the bung because it runs so nice. I will do a mileage test when I bring it out in the spring and report back.
If you dont have drivability problems I wouldn't bother either. But if you have a problem you cant figure out, I have a wideband you can use in the future.

Last edited by sstock; Sun Feb 02 2020 10:49 PM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
Re: Testing Daytona Universal Carburetor UN2
ClassicsR4Me #1344749 Mon Feb 03 2020 01:36 AM
Joined: Mar 2010
Posts: 9,770
5
'Bolter
I would expect 15 MPG for a stock 216 or a 235 whether it has a ton in the bed or empty. I have verified this with each engine. The 216 has a Rochester model B, and the 235 has a Carter YF2100.

Re: Testing Daytona Universal Carburetor UN2
52Carl #1344846 Mon Feb 03 2020 06:36 PM
Joined: Feb 2016
Posts: 199
C
Gabriel Sandoval
I have a recently rebuilt 235 with a Rochester B on it, im still averaging out its consumption. But my 261 seems to give me 12 mpgs no matter what.

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