Roof 101 Cyclone OHV Model A Ford Engine Conversion - Clip #2

This is the 2010 4 Port OHV conversion for the Model A and B Ford. It's modeled after the 1929 R&R Cyclone originally created by Robert Roof of Anderson, Indiana, USA. Charlie Yapp, owner of Scalded Dog Speed Parts contacted Jim Roof, Robert's grandson, and Jim became the new "Chief Designer" and Charlie the producer. The end result is nothing short of a wildly successful mechanical achievement . The power and inefficiency are huge and surprising. The parts are mostly off the shelf at your local dealer. If you get a chance to see one take a close look at the technology, it's different and edgy but still look and sound like a period racing engine. On Our website. . . .you will be able to find the Dyno chart links and much more. . .like contact info. Yapp also manufactures the famous Riley Two Port OHV and the Lion Speed Head.

More Videos...

Flathead Engine Test Run
Gary tests his 1950 Ford Flathead Engine

This video is a walk around of the Roof 101 Cyclone OHV conversion for Model A and B Fords. This is cylinder head #1. It is mounted onto a hopped up 1933 Model B engine and a 1929 Model A chassis. A bit more detailing is needed and then the exciting start up. Originally created in 1929 by Robert Roof and called R&R Cyclone overhead valve. This conversion (one of 65 units made in 2010) was co-created by Charlie Yapp and Jim Roof. The "101" name is based off Jim's grandfather's (Robert Roof) advertising stating the "1929 Model A Ford Roadster went 101 MPH." I suspect this design will do much more than that, as its volumetric efficiency is higher than most NASCAR engines. Learn more at . . . about Scalded Dog Speed Parts and the Secrets Of Speed Society.

Open Engine Model A Ford
1929 Ford Model A Open Runner Engine Display. The first thing you will notice is that the engine is on it's side to give a semi-full view of it's moving parts. Next you will see the distributor has been moved upright to give a better view of the pistons and valves. The 4th cylinder is the only working part of the engine. Bearings and pistons are lubricated with grease and oil. Run times are short due to overheating. There is no cooling other than a few holes drilled into the waterjacket by the Exhaust. Yes, I could have made it water-cooled, but it's the start-up that makes the show! Thanks to Lee Bottensek, Art Hoppe, and Joe Thorn of MetalCrafters ( for their donations towards this project.

How To Free A Motor ~ 1930 Model A Ford frame & stuck engine.
How to get a stuck model A motor to turn over. This is what works for me. 1930 Ford Model A motor. It took about two weeks for this old stuck motor to free up. That's the longest it has ever taken. But it worked. I think this motor may have been stuck/seized/froze up for at least 50 years? Next time I am going to try ACETONE & transmission fluid? In a 1923 Oakland motor that I have. Thanks for watching.