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Roof 101 Cyclone OHV Four Port - 2nd Generation For The Ford 1928 to 1934 Model A & B 60 ROOF HEADS, PURCHASED SIGHT UNSEEN, HAVE BEEN SHIPPED
Meet Jim "Chief Designer" Roof , see and hear the engine run HERE An Improved reproduction of the 1929 Robert M. Roof, R&R Cyclone OHV Chief Designer, Jim Roof and Produced by Charlie Yapp
& Meet Charlie Yapp HERE & HERE
$4,650.00 + MANIFOLD + SHIP New improved version is a FOUR PORT "F" HEAD design, where the head has 4 intake ports & your block has 4 exhaust ports. Price Does Not Include Optional Parts: Side Plates (A or B); Distributor Riser-Drive Shaft; and Intake Manifold. SOCIETY DISCOUNT DOES NOT APPLY ON OHV KITS
94.30 hp out of our box*
Few, if any, OHV conversion in the "F" head style for the Model A or B Ford have this high level of breathing. In fact, "the Roof 101 Cyclone breaths better than many NASCAR racing engines." The rocker has been changed to a roller rocker arm.
This OHV conversion is a Four Port "F" head . . . That is, where the intake valves are in the head and the exhaust valves are in the block.
The combustion chamber is based on years of research and experience with "F" head conversions. As an experiment we have even added HP improving "Singh" turbulence grooves (3 to each chamber). We have also included "FireWire" grooves that help prevent gasket blows between the cylinders #1& #2 and #3& #4. The head features a "squish" flat surface over pistons that enhances chamber turbulence for maximum fuel mix and power. Look close and notice each entire chamber (except for the spark plug opening) is CNC machined and each chamber is identical in shape and CCs.
The Roof 101 Intake manifold is a three carburetor job. Using the 2 outside mounts only, with Stromberg 97s, provides 100% of the breathing necessary for maximum air flow. This little fact is generally unheard of in the industry. Using 1 Stromberg 97 carb in the middle only provides about 80% of capacity. The aluminum block off plates are in the manifold kit. . . . Also, the manifold can be water heated.
The Roof badge (above) is brilliant blue glass on brass (Cloisonné like the 1928-29 Ford Radiator logo) and fits into the intake manifold and the Roof Side Valve Cover. One badge is included with each kit.
Water pump used is the 1932 (long) Model B water pump.
The valves are 1.75" and the rocker train is modern roller rockers, springs and hardware. The rocker stud houses the oil pathway to the rockers and is custom made by us.
The four Valve covers are manganese bronze and will polish like gold.
The head is a two part affair, where the bottom is cast iron. In the photo above you can see the large intake ports surrounded by "O" ring gasket grooves. Those ports match the rocker box throats, which match the intake manifold throats. The Rocker boxes are aluminum (2) and are bolted in place to 4 decimal points of accuracy.
Our Team GeoTech Pattern & Mold, Inc., Loveland, OH, Jon Ledford, President, (513-683-2600). The pattern shop. They constructed the Roof 101: Cylinder Head, Rocker Box, Box Cover, Intake Manifold, blank off plates and side valve covers (A&B). All Modeling will was done with 3-D software called "Solid Works". Images from the modeling will be posted here from time to time. (http://www.geotech-pattern.com) Northfield MFG, Inc., Northfield, MI , Scott & Chris Tynan, (800-525-2425). The gray iron Foundry. These are the same folks that cast my Riley Two Port, Lion Speed Head, Lizard Head, and for Ford Motors, the Model T blocks and heads for the 100th celebration. Crystyl Engineering, Inc., Piqua, OH, Dan Gaier, president, (937-773-6940) did the aluminum and bronze castings. A highly regarded foundry dedicated to high quality short runs. Valley Stamping, Inc., Pacoima, CA, John Lee, President, (818-896-8722), will be stamping precision valve train parts.
Line drawing below has latest details.
The Complete Kit Includes All Cylinder Head Parts, Fully Assembled, Tested and Dyno'd |
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ROOF 101 OHV SPECIFICATIONS The ROOF 101 Cyclone OHV Four Port is a faithful reproduction of the original cast iron 1929 R&R Cyclone OHV cylinder head made from 1929 to 1950 for the Model "A" & "B" Ford. We believe this was the first OHV Model A Ford cylinder head that made it to market. Our model is based on the rarest 1929 "cast iron version". The ROOF 101 is a powerful, efficient and reliable 4 valve OHV "F" head, Four Port, featuring four 1.73" diameter intake valves, with 1.5 rocker ratio in the head, and 4 exhausts in the block, that will more than double the horse power, run cooler and give better gas mileage. The acceleration will put a smile on your face. Fully oil pressurized, fully adjustable and fits under the hood without modification. Because it is authentic cast iron, you will not have adverse corrosion or expansion problems like you would with some aluminum heads. . . . This new head will incorporate design changes to improve airflow, valve action, cooling, and stability. . .
Above, actual finished art of one of two "Roof 101" four port Rocker Boxes. Below is a "Cyclone" two port original version fitted with a Wico-X and a single Winfield updraft.
Photo of original "Cyclone" cylinder head shown above is for your general information and comparison. "Roof 101" is a true "four port" - Original, shown above, is a" two port" version. Photo by Charlie Yapp at the "Smith American Speed Museum". Your Block: For normal road driving and cross country touring, use a stock Model "A" or "B" Ford four cylinder block (1928-1934). The block should be fresh. Babbitt bearings are fine, insert bearings will last longer. Use the stock oiling system and rods. We recommend a counter balanced crankshaft and a bronze timing gear. Your exhaust valve train, our valve plugs and your "single locker" adjustable tappets must be in place at the intake positions. Compression Ratio: We offer a 137 cc version (+ - 6.5:1CR @ standard bore). Roof 101 OHV heads are delivered with a 1/16" deep circular fly-cut above the cylinders. This is to help insure that pistons do not touch the combustion chamber. For higher compression you may mill the deck at your end. The thickness of the gasket plus the fly-cut give adequate clearance. Some engine rebuilds have the pistons higher than flush with deck, which increases CR. Combustion Chamber:
First look at the combustion chamber The new chamber will be CNC machined. Each chamber matches exactly each other in shape, size and cc's. Each will have plenty of "squish" area. The intake valve is centrally located and one spark plug enters from left piston side. Turbulence grooves will be added to improve combustion turbulence. The chamber is a modified "wedge", as the valve will be positioned at and angle of about 12 degrees. These specs are subject to change. If you are a "wild & crazy guy" you can order a head without the CNC chamber work. Then you can shape it to your hearts desire. Un-machined, the sides and top of the chamber will have 1/8" additional machine stock.
Head Gasket: HIGH TECH GRAPHITE-STEEL CORE-COPPER COMPOSITE HEAD GASKETS with copper fire rings. A special polymer coating on both sides melts into the small capillary scratches on the head and block and stops water leakage. These are excellent "F" Head Gaskets. . . . They are a NEW design to better fit all "F" head equipment. The best we have ever offered. I buy these in bulk and I think I have the lowest price in the community. I have my name stamped on each gasket to show my approval. Everybody should carry a spare gasket with them. These "F" head gaskets are made from new dies from our prints. The fit is world class. Gaskets: 1 head gasket, Intake manifold, water pump, fire wires, and OHV cover gaskets supplied. Additionally, we will be using "O" rings in many locations for positive sealing: Intake Manifold; Rocker Box to head; Rocker Covers. Head Studs: Custom made grade 8 studs with rolled threads and grade 8 nuts (the head is 1/2" higher). Camshaft: OPTIONAL Best choice to be determined. A Model "B" or "touring grind" camshaft should prove excellent for most touring, near stock idle and fast road driving. Almost any performance cam grind can be used. REMEMBER the head has a 1.5:1 rocker ratio: The 0.298 "A" cam is now 0.447" lift; a .303" lift "B" cam is now 0.456" lift; A .356" lift "hot" cam is now 0.534" lift. . . measure the combustion chamber space (1.00" + -) and deduct piston pop up to determine your usable valve lift spacing. Generally anything .750" or less is very safe . . .BUT ALWAYS MEASURE & TEST FIRST!!!!! Intake Valve: The ROOF 101 uses one large 1.73" intake per cylinder. Additional machine stock is present to use larger valves (up to 2" +) and to enlarge the port throat if desired in the field. These are "modern" straight stem designs. Rocker Ratio: The rocker ratio is 1.5:1. Rockers will be interchangeable for higher ratios, etc. Rocker Arms: Roller rocker arms, forged and semi polished, mounted on a special rocker stud of our design.
Intake Port Covers: OPTIONAL Two Port Covers (2) are used to cover unused intake ports on side of the block. These have no name on them. Intake Manifold: OPTIONAL No existing intake will fit the new head. It can be used either as an up-draft or down-draft . Use it as: single-up or single-down-draft OR dual-up or down-draft . . OR a triple. Aluminum Cover Plates will be supplied. OPTIONAL adapter(s) might be required for your carburetor of choice. Some carbs will fit without adapters. Ford 1941 to 1953 single throat six cylinder Holley carburetors are a direct bolt on.
Drawings shows the manifold to head mounts, the 3 mount possibilities. and the hot water jacket. Just turn the manifold over for updraft. A hot water holding tank is fed from 2 water ports on the side of the head to 2 ports on the manifold. This will provide hot circulating water to help vaporize the fuel. Side Plate Valve Covers: OPTIONAL The 1/4' thick aluminum plate will resemble a stock plate (no fins), have a couple bosses for oil pickup and or return, an in bedded brass and blue glass (cloisonné) name plate in large block letters "Roof 101 Cyclone, and smaller lettering underneath "MADE IN CINCINNATI, OHIO, U.S.A.". The aluminum and brass theme will be found throughout. This plate will be available for both Model "A" and "B" sized side plates. Exhaust Valves: are in the stock position in your block ("F" head design). Stock 1.5" sizes work well. Consult with your engine builder if larger valves are desired. Rocker Boxes: Precision machined cast 356-T6 aluminum boxes feature trick internal oil pressure lines. Can be polished. These boxes are the secret to the whole project. They require a high degree of machining. They are distinctive and unusual. Oil Pressure: Each head and Rocker Box is "trick" machined to feed pressure oil to the rocker system. Oil returns to the engine block via the pushrod channels. This will effectively oil the Roof 101 valve train with the stock oil pump system. Stock Model A or B pressure is adequate. System with high pressure pumps will require modest "oil-restrictor-plug" to prevent oil flooding. Valve Plugs: supplied Available to all engine rebuilders . . .
All heads are supplied with four billet aluminum Valve Plugs (available ahead of time). These are press fit into the INTAKE valve guide hole and into the empty hardened valve seat hole of your block. The final installation is usually done by a machinist. When rebuilding the engine we recommend that hardened valve seats be cut for all 8 seats, but installed only in the exhaust. The Valve Plug comes fully machined to fit the new valve seat hole and valve guide hole and is just pressed in. The Plug should be either dead flush with engine deck (machined with deck) or "just" below the deck with engines that have been pre-decked. These Plugs are required for specialized oil return and give additional gasket support. Valve Covers: supplied Four Cast Brass with special sealing gaskets. These are made from plaster molds and are very smooth an polishable. They are not polished by us. Spark Plugs: OPTIONAL Common 14mm, 3/4" reach, flat seat plugs. Push Rods: supplied Custom made, hardened, ball ends. Water Pump: OPTIONAL Not Supplied in kit
Model B Ford. These 1932 models are now being made new. Available from Mac's Antique Auto (www.macsautoparts.com). There is a "leakless" and a "stock" assembly available. Excellent rebuilds are also available from Dave Renner, Renner's Corner (734)428-8424 (MI). Distributor: Any distributor used for Model A or B Fords will fit. Those owners using round speed caps, Mallory, FS ignition, Roto-Faze distributors or Wico magnetos can mount the units directly to the head. Distributor Driveshaft: A correctly sized distributor driveshaft is supplied. The shaft is designed 1/2" too long with longer slots. Owner will grind off equal material from each end to custom fit to size needed. We can provide an OPTIONAL "Distributor Riser" and OPTIONAL longer driveshaft to lift the distributor 2" higher so that the stock distributor's manual advance, stock wing cap and wires will clear the covers. Shipping: Each head will be assembled and packed for safe shipment by UPS. Shipping/crating costs payable in advance ($99 USA). Overseas shipping available.
Proudly Made in U.S.A.
The Roof 101 Project is owned and produced by Yapp Studios, Inc. Patents Pending and Copyrighted by Charles H. Yapp 2009
Robert Roof, 1929, standing beside his Model A Roadster promotion vehicle. Cylinder head price is $4,650 + $280 Manifold + $100 shipping no discounts Pricing & specs are subject to change without notice. 6.5% Ohio sales tax to Ohio state residences only.
Every Buyer Must Sign a "Release and Hold Harmless Agreement" before head will be shipped. Sample copy sent on request. WARRANTY: Yapp Studios, Inc. warrants for thirty (30) days that the workmanship and materials of the ROOF 101 Cyclone Cylinder Head are as represented. If the head is modified in any way whatsoever the warranty is null and void. When you receive your head, inspect it, if it does not appear correct, call us and we will arrange for a full refund, repair or exchange. This product makes increased horse power and is used as an automotive racing product, therefore no other warranty is expressed or implied. The warranty is non transferable. Having said that, be assured that we stand behind all our products and will get you on the road. |
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