Dyno Run 67 Mustang with 200 4-11-09

[wsa111]

Ran my 67 mustang with the old engine today.
Temperature was 73 degrees F & @ 45' above sea level.
Engine is a 204" engine with a 274 camshaft & a holley 4412 carb with annular discharge nozzles direct mounted on a 80 modified head with 1.6 roller tip rockers. See my profile.

http://i105.photobucket.com/albums/m237 ... lers66.flv
video & audio of run

A/F was 13.2 WOT
The dyno is a new dynojet unit.

I wish i could have run the 1.65 yella-terra full roller rockers.
Because of an oil leak at the lr of the engine i had to remove them.
In the future i will block the oil supply to the head by plugging the oil galley at the left rear of the engine.
The engine was definitely stronger with the 1.65 rockers.
I bet i lost at least 5 HP by having to go to the 1.6 roller tip rockers to releave the full oil pressure at the headgasket sealing area.
The 274 cam has served its purpose & now i am ready to step up to a very aggressive camshaft which will require valve springs in the 140# seat pressure area.
The log head hopefully will respond to a more aggressive camshaft by camshaft innovations for more power.
The secret is a matched combination of componets & the present camshaft & the head are limiting the full potential of this engine.

To use the CI head with valve lifts in the .570" area it will require longer valves for a higher spring height for the increased lift & clearance between the retainer & the valve seal-guide area.

When the CI head was designed no one ever thought of using valve lifts in the .570" area.

Overall i am very satisified with my power results.
If i richen the mixture to say 12.8 i may loose 5 HP but will gain 5-10 ftlbs of torque.
Only track testing will be the final answer. Bill

 

[Gene Fiore]

Pretty good numbers there !

 

[Does10s]

.....45' above sea level.

Jeezzzz.....no wonder the numbers look good!

Pretty good numbers at the tires!
Later,
Will

 

[shmoozo]

Those numbers were measured at the rear wheels, right?

Impressive.

 

[wsa111]

Shmoozo, yes those runs were made on a dynojet chassis dyno.
145 HP with a 25% driveline loss is about 181 flywheel HP.
For the street the CSC/CI 274 cam performed great.
With a more aggressive camshaft i think there is still more HP there??
Even the air cleaner was left on & my exhaust system was through full length tailpipes after the flowmaster mufflers. Bill

 

[Mustang_Geezer]

Looks good Bill!!

When do you think youre going to switch motors and do a dyno pull on the new one??

Later,

 

[wsa111]

Doug, i still want to do some carburetor tests on the present engine.
I would also like to track test a couple of different carbs.
The carb i will test next is a 7448-350 holley with the throttle shafts thinned for an extra 20 CFM.
Then a 4412-500 carb with a booster the same size as stock but is an annular discharge type.

The carb i dynoed is a 4412-500 with large annular boosters.
All these carb are custom modified & are not available from holley.

The main thing after that is to see if the spring seat under the intake valves can be deepened .020" so i can use springs with 130# on the seat & 340# open pressure.

Otherwise i will have to go to longer valves to obtain the necessary spring height for .570" lift.

I might do the swap mid summer depending on progress of testing & show season.

There is no doubt in my mind that the new camshaft from Jay @ camshaft innovations will blow away the present camshaft all the way from low end, midrange & top end. Bill

 

[Ronbo]

Bill, really nice! Guess you proved your point about direct mount logs By chance do you work with the ships down there? I'm at Ft Gordon.

Ron

 

[wsa111]

Ron, the navy ended my ship career.

I do sun distributor machine advance curves & do custom air fuel calibrations using the innovate wideband mobile A/F tester.

The custom carb work that i can't do is farmed out to various professional carburetor shops, then i do the final A/F calibration.

I also try to help customers with camshaft selections.

The main thing to remember is a camshaft for a weekend warrior & a true racer all fall into a custom grind or for the daily driver just the best choice of cams avaiable in stock from various grinders. Bill

 

[Ronbo]

Great! Well, you certainly have a nice display/show vehicle to back up your handy work Someday I'll get back around to messing with the curve in my beast. With the little bit of tinkering I've done and the perfect test beasts (esp. the 83 Bronco) to tinker with, I can attest to the benefits hidden in the distributor. Take care!

Ron

 

[Passauf]

Bill,
Nice numbers and detailed report. keep up the good work.

 

[Anonymous]

I ran across this old dyno run & the #'s look awsome.
How come this engine almost puts out close to the dyno runs of the classic inlines cylinder head tests.
Where do you buy one of those carburetors??
Seems like the engine builder must be doing something right. Outlaw

 

[Broncitis]

No offense to WSA and a great build, but I would like to see where you are getting your # comparisons that are close to the CI head dyno at pony carbs, I really think you should look again, sorry its not close. At least 25% is alot when getting the last horses out of a small engine.

 

[Anonymous]

Broncitis, i was just looking at the one dyno test not at pony carbs, but the hp was very close.
I now see the tests at pony carbs.
That makes sense, but the air fuel ratio on some of the tests was just a little above 11 to 1.
Either the tester was not reading properly or the tests were bogus. Sound like the choke was partially on during some of the tests.
Air flow with the ci head should put out more power as you said. Outlaw

 

[Anlushac11]

Very nice numbers!

Looks good!