Feb 15, 2012 it takes a craftsmans touch to shape the surfaces of the head for the optimal flow characteristics and the best performance. They are available in double cut and now some are available in aluminum cut. And theres a new alloy head the americans now have but made in australia apparently lets take a look back to the old 250 to see the developments. Porting demands the right tools, skills, and application of knowledge. Then look no further than cylinder head developments in bromsgrove leaders in cylinder head porting and gas flow technology. This simple ebar tool makes accurate, failsafe porting of the pushrod pinch point a breeze. Ford escort,cortina,crossflow,xflow,formula ford 1600gt kent engine head bolts. Our long shank burs are manufactured with a solid carbide bur brazed to a 6 long steel shank. Porting a crossflow head fordsix performance forum. Everyone here goes into detail on porting mostly for na 250 xflows for obvious reasons. Cylinder head porting is an automotive machining processes that the average mechanic can do at home. The five golden rules of porting cylinder heads part 7. Cylinder head porting services brzezinski racing products.
All the aspects of porting stock as well as aftermarket. This happens often when the burr gets bound in a tight place, such as between a bowl wall and valve guide. Finally, locate the three coolant passages on the pushrod side of the crossflow head. Includes the txmc hangup motor12 hp peak with full horsepower under full load.
The thesis has not been accepted for any degree and is not concurrently submitted in candidature of any other degree. Unfollow cylinder head porting kit to stop getting updates on your ebay feed. Intake will be on driver side and exhaust on the passenger side. I declare that this thesis entitled intake port flow study on various cylinder head using flowbench is the result of my own research except as cited in the reference. In that time he has ported more than 900 sets of heads. Supplied with carb mounting studs, washers, nuts and gaskets, the head can be used on 8489509979981098 and 1275cc. Porting involves using an assortment of grinding and cutting bits to reshape or polish the cylinder heads intake and exhaust ports, and combustion chamber. The 1489cc engine i run has a normal crossflow head but i have another engine that started off precrossflow that i modified with a crossflow head with combustion chambers, still using the original flat top pistons. Intake flows will be around 250, not sure on the exh. Jul 11, 2015 consider that the head designer has to fit both the intake and exhaust ports in the same real estate as the head bolts want to occupy, and youll realise that the ability to use both sides of the head to snake the ports through those bosses will allow better port flow with a crossflow head. Claiming a cylinder head has too much lowlift flow is a little like. Im very curious to compare flow figures from a mild ported crossflow head against the new pre crossflow.
Porting and polishing kits to purchase from a list of all porting and polishing kits offered by cc specialty tools, including cylinder head kits, porting abrasive kits, 2 stroke porting kits, rubber abrasive kits, cross buff abrasive kits, 220 230 240 volt motor kits and many. How much you want to spend will pretty much dictate how much porting you will be able to do. Ok, he wanted one specifically about sr20 heads, but at a general level porting a cylinder head is more or less the same across the board, though of course there are important differences that pros like our friend dave. I thought i would start a separate thread for the head port im working on for the race head im going to be doing for a proddy speedway car. These burs are for those jobs when you need a little extra reach. The eastwood cylinder head porting kit is designed to allow the home mechanic, using little more than a highspeed grinder, to clean, polish, and lightly modify the ports on cylinder heads. The original special tuning head 8 port head by jim whitehouse is the ultimate push rod head. I am going to go through a 250 alloy in an auto 3150lb falcon xf ute for the. A crossflow cylinder head is a cylinder head that features the intake and.
Trick flow specialties tfs90005 trick flow cylinder head porting tools compare cylinder head porting tool, carbide burr bit, 2. Porting cylinder heads allows you to flow more air and unlock hidden. I thought i would start a separate thread for the head port im working on for the. I was wondering how this would be with the 1500 precrossflow cortina head, as the head is a recessed. Developing highly functional cylinder heads for performance. I have an unmarked xe carby head from a 250 which ill be using. David vizards how to port and flow test cylinder heads. Home if you are going to do any porting, you will have to invest in some equipment. Roger wanted us to test all the different cylinder head combinations on the same. They offer scribe tools to singlecut and doublecut carbide burrs to grinding wax and blue layout fluid. Unfollow porting tools to stop getting updates on your ebay feed. Oct 21, 2007 this is my collection of two stroke performance motor textbooks. There are some very good books on xflows and the tuning there of. Dick johnston, an old turbo and carb cross flow developer, found the primary icrease was in the intkae port size and manifold size, not the shape.
The problem wit porting books is that there are none that actually tell other than a novice anything. These tools are essential for cleaning up ports, combustion chambers, and portmatching intake manifolds or cylinder heads at home. A newly designed cross flow head for the 250292 chevy motor is in the works. A crossflow cylinder head is a cylinder head that features the intake and exhaust ports on opposite sides. There is little shrouding with the canted valve head, quite a lot with the 2v and log heads. Porting bits, individual free shipping on orders over. How much does the bore size matter when flow testing. For the record, pocket porting heads reworking and blending the seats into the first 2 or so inches of the port is all about focusing on rule number1, to the exclusion of almost all else. A crossflow head gives better performance than a reverseflow cylinder head though not as good as a uniflow, but the popular explanation put forward for this that the gases dont have to change direction and hence are moved into and out of the cylinder more efficiently is a simplification since there is no continuous flow because of valve opening and closing. There is a lot more here on speedtalk than there is in any book.
These heads now flow much more air than stock heads and i expect the exhaust ports will not build any carbon now. Crossflow cylinder head for sale in uk view 18 bargains. Bmc a series 7 port crossflow aluminium heads are assembled with valves and springs. This is a newly gas flowed, polished and ported cylinder head. For a cleanup and a little blending, a small dremel and some stones can handle most jobs. In fact, on the honda dseries, bseries and kseries cylinder heads i have had ported and flowbench tested, as much as 3040% of the improvement to airflow has come from work done in the bowl area. Exhaust porting ford xflow head clarkos performance. To better understand how air flows through a head on its way to the combustion camber, lets take a look at the anatomy of a. Consider that the head designer has to fit both the intake and exhaust ports in the same real estate as the head bolts want to occupy, and youll realise that the ability to use both sides of the head to snake the ports through those bosses will allow better port flow with a crossflow head. Page 1 of 5 250 2v verse new 250 inline alloy head verse 250 crossflow. Apr 28, 2011 page 1 of 5 250 2v verse new 250 inline alloy head verse 250 crossflow. Our services include cad design, 5axis cnc porting, engine building and dyno testing take a look at our photo gallery of our range of cnc ported 4 cylinder heads, cnc ported 6 cylinder heads, cnc. We would like to show you a description here but the site wont allow us.
Find great deals on ebay for porting tools and cylinder head porting tools. I was mainly interested in the flap wheels and the cross buffs in the kit, but the cartridge rolls have their place in the porting of aluminum heads too as well as more controlled match porting. Crossflow cylinder head news newspapers books scholar jstor may 2008 learn how and when to remove this template message. Cylinder heads, as manufactured, are usually suboptimal for racing applications due to design and are made for maximum durability hence the thickness of the walls. I plan to study them from front to back, before i attempt any porting on my new dio cylinders.
Engine porting kit can help your engine generate more power. It takes a craftsmans touch to shape the surfaces of the head for the optimal flow characteristics and the best performance. X flow head rebuild unleaded conversion etc prices locostbuilders. Red is 450 ftsec, transitioning through yellow at 350 ftsec, to aquamarine at 250 ftsec, and. A crossflow cylinder head is a cylinder head that features the intake and exhaust ports on. This article is a follow up to seans extensive work examining and porting an msx cross flow cylinder head. Torque with any xflow head is bigger than the 2v becasue it can maintain drivability at low valve lifts.
I was mainly interested in the flap wheels and the cross buffs in the kit, but the cartridge rolls have their place in the porting of aluminum heads too as. Port shape and size play huge roles in power on engines. Xflow downdraught heads tentenths motorsport forum. The bowl area, and especially the short turn radius on the port floor, are also critical to airflow in most cylinder heads. Am i right in thinking that i could remove the valve and grind the guide flush with the roof of the port. We are undoubtedly south africas leading cylinder head specialist one stop shop and are capable of preparing very hightech quality heads. Ford escort, cortina crossflow, xflow kent engine cylinder head ported. Jan 09, 2014 for all of the crossflow experts in here. May 08, 2015 cylinder head porting operates under a pretty simple premise.
Sac engineering successfully gas flowed more than 20 000 cylinder heads over the past 33 years and have built at least 2000 very special raceready cylinder heads. Cylinder head developments porting and gas flow technology. It is being developed in new zealand by a daring individual. Porting pointless as the crossflow ports are hugely oversized as standard. Have just read the dave andrews site looking at the porting of the k series head excellent site. Every head ported is also rebuilt, new stainless steel valves, bronze guides, hardened exhaust seats, pressure checked, three angle valve job, and resurfaced, assembled, and painted the color of choice. The gap between the two bar components arrow indicates twice the thickness of. This is one of many books that i bought inorder to get a better view of cylinder head porting. Using a 316 bit, drill holes in the gasket to match these passages. Porting and polishing the msx cross flow head mga guru. Ford 250 alloy crossflow porting tips don terrills speedtalk. Although they are both the same cc all steel dry sumped gear driven, the former engine gives about 10 more hp. On the xflow, when porting the head you are better off concentrating on the intake side. An opportunity has come up that will mean i will bring back the car to that of its period and putting the ford kent engine in it, dont worry i will have a cortina with 4age turbo in it one day just wont be this one at this.
The port has a 3 angle seat cut that is a little worn but still usable. Refurbished ford 1 cylinder head pre cross due to this head having slight damage it has been welded but some one might get the use out of it. It is designed to help get the most out of an existing configuration, not for heavy modification or reshaping of combustion chambers and ports. Have just read the dave andrews site looking at the porting of the k series headexcellent site. I can work with you on my end to spec your compression ratio. What this all leads to is a fairly rough cylinder head, affecting the fluid flow as it makes its way through the side of the cylinder head and into the cylinders via the valve throat. What is cylinder head porting, and how does it increase. Determine what port area you need and try different shapes to get the flow up without increasing the area. We specialize in cylinder head porting tools for automotive, atv, and motorcycles. There has to be a bend in the port to accommodate the valve stem and, worst. Plug placement is better on the xflow, and the chambers are 53. This is in contrast to reverseflow cylinder head designs that have the ports on the same side crossflow heads use overhead valves, but these can be actuated by camshafts that are either in the cylinder block, with actuation by push rods. This completes the required cylinder head modifications. At the end of the day, pocket porting may not produce the fastestlooking set of heads or the most photogenic, but the results can be very satisfying.
This unit is hand crafted with over 25 years of experience with many class wins and championship. It pretty much stays in place as the porting is done, allowing for fast and frequent checks of the remaining metal thickness. When serious engine builders blueprint an engine, theyll port or smoothoff rough head castings around the intake and exhaust ports for improved, smoother air flow. A newly designed cross flow head for the 250 292 chevy motor is in the works. It would be in our best interest to say that you need several different bore sizes to accurately flow test, lets say, smallblock chevy heads because when going from 4. Street port is where i concentrate on the areas like the. Summary is that there is quite a lot to be gained by savage porting the intake section. This port is a c1a casting, and the results are using a stock standard crossflow intake valve, 1. Stepbystep books covering bodywork, electrical, performance. Our rotary porting story has been getting a lot of reads lately, and one of those readers sent me an email asking if id do a cylinder head porting story for piston engines.
Plug placement is better on the xflow, and the chambers are 53 cc from the factory, while the 2v and logs sit around 58 cc. On a two barrel engine i think it would go backwards but a 4 barrel i dont know. Complete cylinder head and intake porting kit d44kit. You may even decide porting is not your thing and take up bird watching, or golf.
Cylinder head porting refers to the process of modifying the intake and exhaust ports of an internal combustion engine to improve quantity of the air flow. To suit 6 cylinder non cross flow alloy cylinder head. Sep 30, 2004 torque with any xflow head is bigger than the 2v becasue it can maintain drivability at low valve lifts. The level c head is fully cnc machined including the combustion chamber which offers unmatched consistency and. Our sst porting is for applications where porting the head is allowed and, because of the application, the cylinder head just doesnt need to be fully 100% ported. We can supply lotus twin cams for your mk1 cortina, to a big valve head for your mgb. A custom intake will need to be made, same for the exhaust. Cylinder head and porting books page 2 don terrill.
Increase airflow through the heads and into the combustion chamber and youve got the potential to make more power, since more air in means more power out. The engine can then breathe easier, resulting in greater power and efficiency. Our classic and historic car service wont be bettered. Famous bennett hiport aluminium cyclinder heads for 6986 holden 308. I have since noticed that my x flow head, whilst beautifully ported out, has the bronze valve guides protruding some 10mm into the port. Porting and polishing kits to purchase from a list of all porting and polishing kits offered by cc specialty tools, including cylinder head kits, porting abrasive kits, 2 stroke porting kits, rubber abrasive kits, cross buff abrasive kits, 220 230 240 volt motor kits and many other porting kits click this link. A couple years ago lee spent some time with joe mondello, the cylinder head porting legend.
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