Click link below to see the complete Roff 101 Cyclone DYNO results
http://modelaparts.net/roof%20101.html/roof%20101.htm
The tests were done by Dennis Piranio and the engine was set up like this:
NOTE: PLEASE SEE THE ABOVE SITE FOR GRAPHS OF NOT ONLY HP BUT TORQUE AND NOTICE THE RPM RANGE OR SPREAD IN THE TORQUE GRAPHS . . . IT IS A GOOD THING TO HAVE A LOT OF TORQUE OVER A WIDE SPREAD. It is even better for a powerful street engine to have HP and Torque matched high in the shifting to cruising rpm range . . . Like the Roof 101 Cyclone!
DYNO #2: SAME AS ABOVE BUT MOVED
TIMING TO 28 DEGREES = 83.15 HP @
3100 RPM
DYNO #5: WE REPLACED THE CAST IRON "MT" HEADER & "SMITHY'S" MUFFLER WITH A "RED'S HEADERS" 4 TUBE INTO 1 COLLECTOR TUBULAR HEADER & OUR DYNO MUFFLER. THIS INCREASED THE HP TO 91.52 @ 3100 RPM & 94.38 HP @3500 RPM
NEXT TEST INCORPORATED YAPP'S DUAL "Y" CAST IRON HEADERS
*
DYNO #6:
CHARLIE YAPP'S DUAL "Y" CAST EXHAUST INTO 2 "SMITHY'S" MUFFLERS, 28 DEGREES TIMING
THE RESULTS OF THE EARLIER DYNO TESTS SUGGESTED
THAT WE NEEDED A "TRI Y" STYLE HEADER WITH VERY LONG SECONDARY TUBES
TO SMOOTH OUT THE TORQUE CURVE. WE CONSTRUCTED THIS EXHAUST SYSTEM
USING 2" DIAMETER X 48" SECONDARY TUBES & A "H" STYLE MERGE JUST
BEFORE THE MUFFLERS. THIS EXHAUST SYSTEM BROUGHT THE TORQUE IN
FASTER & HELD IT THROUGH OUT STREET RPM RANGES.
WHILE HP IS SLIGHTLY LOWER THE TORQUE IS LEVELED OUT AND IS MORE
APPROPRIATE FOR STREET USE AND SHIFT POINTS.
THIS TEST = 94.30
HP @ 3100
Photos by Dennis Piranio
IT MUST BE ASSUMED THAT IMPROVED CAMSHAFT, CARBURETION, TIMING, ROCKER RATIO, VALVE SIZES, FUEL, COMPRESSION RATIO, TUNED HEADERS AND MORE WILL MAKE THIS AN EXTREMELY EXCITING AND COMPETITIVE ENGINE.
YAPP Studios (Scalded Dog Speed Parts) is testing the cast iron dual "Y" header system as this configuration :
2" secondary pipes, into TWO-INTO-ONE collector to 3" exit, to a 3" X 10" flex pipe, to an 18" L X 3" diameter glass pack muffler, into 3" x 48" extension to rear. Photos to come.
NEWS! 3-29-10:
Dennis Piranio (PIRANIO’S ANTIQUE AUTOMOTIVE) has begun the all important airflow and dyno testing. First results are beyond imagination (3-26-10). Dennis said that "who ever designed the porting was a genius" (we'll take that . . . huge grin). He has "never seen more efficient flow bench numbers on a Model A head of any type!" He went on to to say that, "an exhaust valve larger than 1.535" was a waste of time and money with the Roof 101 Cyclone, it couldn't be better - it's the perfect perfect size!". "This head will deliver a lot of horsepower over a wide RPM range.4-13-10: More good news: The intake manifold, as is, with all three ports open, flows excellent. With the two outboard carb ports opened to 1.625 and the center hole closed the flow is a match. It is expected that Stromberg 97's or Holley 94's will be an excellent match. 2 New 97's will be used for further testing.
Photos by Dennis Piranio
The next step in Piranio's development program will be to look at the valve train geometry and rocker arm ratio. Followed by a variety of dyno "pulls" using different parts: Cams, headers, manifold and carburetors and perhaps compression ratios.. Stay tuned to this spot for more information as it becomes available.
Go to Dennis's website for photographs, charts and spread sheets on each test as they are finished. Here is the link:
http://modelaparts.net/roof%20101.html/roof%20101.htm
THEN SCROLL DOWN & CLICK "NEXT"