home | tech | search | checkout | contact | email | forum

Classic Inlines603 W Pecos AveMesa, AZ 85210

(602) 708-66509am-5pm (PST) Monday-Friday

INTERNET-PHONESALES ONLY

NO WALK-INSWe do not have

a store front

Pony Carbs Dyno Results

Classic Inlines was invited to spend a couple days at Pony Carbs, so we could test their Autolitecarbs on our new aluminum head. The following data is the result of fourteen dyno runs madewhile we were there. Our first pull was with their new 1100 annular discharge one barrel carb,on a stock 200ci engine. This was done for no particular reason, other than to gain aperspective of the power made from a stock 200ci. The rest of the numbers are the results ofthe dyno test performed on Mike Raley's 66 mustang, using his current Holley 500-2V, andseveral Autolite carbs. It should be noted that the Autolite carbs, were pulled off the shelf,where they store carbs that are rebuilt and ready to ship. They were not custom built or tunedin anyway, to suit this particular engine. However we did re-jet them during testing, so wecould obtain the best fuel/air ratio possible.

Engine Build: stock 200ci short block with ARP rod bolts, Classic Inlines new aluminum headwith 184/150 valves, 264-110 cam, 1.6 ratio rockers, dual-out headers, and our DUI ignitionsystem. The DUI dizzy is set up with 24 degrees of mechanical advance @ 3000rpm, andtiming was set using a vacuum gage, at 16 psi. While were not sure what the initial timing wasset at (no one had a timing light), Mike is trying to borrow one so we can find out, thusallowing us to calculate the total timing.

In summary the Autolite carbs worked quite well, in fact better than we expected. We wereextremely please to achieve 225 plus rear wheel horsepower from this engine combo, which

none of us thought was possible. We believe there were two reason for this. First andforemost, Autolite carbs are an annular discharge design, which is patented by Ford. Thistechnique of metering/distributing/mixing fuel into the air stream atomizes, or vaporizes the

Search

Products

Alum Heads

Checkout

Shipping

Support Info

Company Info

Inline News

Research R&D)

Inline Racing

Project Cars

Tech & Specs

The Dyno Room

Favorite Links

Show Schedule

Photo Gallery

Customer Login

FordSix Forum

Site Map - Index

technique of metering/distributing/mixing fuel into the air stream atomizes, or vaporizes thefuel more completely, which improves combustion and performance.

It was also evident that the new aluminum head and intake manifold, prefer a specific size ofventuri, at least for this set-up. The two carbs that made the most power, a 2V and a 4V, hadventuri's which were 1.00 and 1.02 inches respectfully. When we tried a smaller venturi (0.98)we lost power, which we assumed was due to lack of cfm. When we tried a larger venturi(1.08), expecting a gain from the increase in cfm, we were surprised when we again lostpower. Therefore we came to the conclusion that the size of venturi is extremely important forachieving the best intake velocity, and that the venturi size will vary depending on the cfmrequirements of a specific build. This also verified that the intake velocity is directly relationalto the power produced.

While the 240cfm-2V carb made the most power of the two barrel carbs, the 480cfm-4Vproduced a bit more. Therefore it is also safe to assume, while the 240cfm worked well, thisparticular build required more cfm than was available from the 240cfm-2V. This was providedwith the vacuum secondaries on the 480cfm-4V, which resulted in the largest gains and thebest power. We are not implying that this is the best carb available for a small six with analuminum head, only that the 4V carb made the most power of the carbs we tested that day. Itis reasonable to assume that a 390, 480, or 600cfm Holley 4V carb may have work just aswell, however they were not available for testing that day. That being said, two similar buildsusing Holley carbs, are also making around 160-170hp, which is right where Mike was prior tohis visit to Pony Carbs.

Sid and Joseph, employee's of Pony Carbs, re-jet the Autolite 480-4V carb.

Here are a few videos you can watch, which are hosted on Imageshack. Make sure to hit yourbrowsers back button when the video ends, if you want to be returned to this page.

Video Comments

Dyno test using an Autolite 480cfm-4V carb from Pony Carbs.

Dyno test using the Autolite 480cfm-4V, which was jetted to rich.

Ride Along after the Autolite 480cfm-4V carb was permanently installed.

Acceleration mild stab on the throttle, after coming back from a test drive.

NOTE: In the second video above, we made the most power from the dyno pulls that day. However we tossed out that run, and went with the second best for our posted results.

Gene, Collin, and MikeR (left to right) waiting to make the next dyno pull.

The results, graphs, and data sheets are posted below.

Dyno Summary - Peak Power from Carbs Tested

Carburetorcfm-type

Venturi Size JetSize

DizzyVac

A/F RPM HP TQ Max TQ@ RPMPri Sec

Stock 200ci200cfm-1V

1.20 N/A ? P 14.36 4650 73.82 68.8 73.41@4150

Autolite200cfm-1V

1.34 N/A ? M 14.05 4000 117.1 153.8 165.1@3150

Holley500cfm-2V

1.43 N/A 52 P 11.20 4900 141.6 151.6 168.7@2200

Holley500cfm-2V

1.43 N/A 52 M 11.21 5000 177.7 186.6 207.8@2900

Autolite200cfm-2V

0.98 N/A 50 M 12.45 4850 157.4 170.4 194.4@2900

Autolite

240cfm-2V 1.02 N/A 48 M 13.76 4950 196.6 208.6 213.4@3000

Autolite287cfm-2V

1.08 N/A 50 M 14.19 5000 190.1 199.6 204.2@3100

Autolite480cfm-4V

1.00 1.08 43/60 M 11.13 4850 211.0 227.5 227.5@4850

Note: During our baseline runs with the Holley carb, we tested the DUI distributor with ported and manifoldvacuum to see which was better. It was easy to see that the DUI liked manifold vacuum much better, as we

vacuum to see which was better. It was easy to see that the DUI liked manifold vacuum much better, as wedropped 35hp on ported vacuum (see the first two graphs below). All consecutive dyno runs were done usingmanifold vacuum, with the timing set at 16lbs of manifold vacuum.

GRAPHS (click on the graphs for a large image)

Holley 500cfm-2V (ported vac)

Holley 500cfm-2V (manifold vac)

Autolite 240cfm-2V with 48 jets

Autolite 480cfm-4V with 43/60 jets

DATA SHEETS

With: Holley 500cfm-2V (ported vac)

With: Holley 500cfm-2V (manifold vac)

Autolite 240cfm-2V with 48 jets

Autolite 480cfm-4V with 43/60 jets

Dyno: #1 - #2 - #3 - #4 - #5 - #6 - #7 - #8 - #9 - #10

Track: #1 - #2 - #3 - #4 - #5 - #6 - #7 - #8 - #9 - #10

Click here to purchase Carburetors, Adaptors, and RelatedProducts

Related Tech Articles - Induction

Selecting the Right Carb How to Calculate CFM Autolite Carbs - Q&A

1V Carburetors 2V Carburetors 2V Carburetor Swaps

Load-O-Matic Dizzy Dyno Testing the 2V's More 2V Dyno Testing

Future Article 2100-2V Service Manual 4100-4V Service Manual

Related Tech Articles - Cylinder Heads

Cylinder Head Swaps Cylinder Head Porting Cylinder Head Service

Flow Testing Log Heads Exhaust Port Dividers The Dyno Room

[ home ] [ index ] [ products ] [ search ] [ checkout ]

Copyright 2012 - Classic Inlines - All Rights Reserved