Power potential is about the same as the earlier injection engine - a genuine 120 bhp or a tad more is a decent target with a good head and 274 cam - add another 10 bhp for a big valve head. This carburettor has twin venturis each with a throttle plate sequentially controlled by a mechanism by the accelerator cable. Its valves were mounted at a compound angle in hemispherical combustion chambers, although some versions altered the combustion chamber shape to increase swirl. As this crops up so often on newsgroups and emails I'll expand on the matter. First, the aforementioned skimming of the pistons and, secondly, a good old-fashioned re-bore. Change the oil and filter too flush the engine out as well if you want to do the job properly - all that material that wore off the old cam lobes is down in the sump gradually wrecking the crank bearings and oil pump. Early Mk5 Escorts carried the engine but it was phased out in favour of the Zetec.
Ideally it should be done on selected castings and we can advise as necessary before work commences. The first two digits indicate the design year of the head. This version featured a reworked cylinder head, solid cam followers and bronze bearings for high-revving applications and a host of other motorsport features. Most other types of engine show little or no cam wear in normal use and if wear does start then it tends to accelerate exponentially leading to rapid failure. Under no circumstances fit larger exhaust valves and any tuning firm that does this can be safely avoided as they have no clue how to modify this engine properly. Lubricate inside with oil and tap gently into place on the valve guide with a small socket or length of tube. This long stroke necessitated a raised engine block deck, a design also shared with later units.
Use in Europe Type capacity power Fiesta '84 Fiesta '89 Escort '81 Orion '83 Escort '86 Orion '86 Escort '91 Orion '91 Sierra '86 1. It was later used in the Ford Sierra as well as the second generation Ford Fiesta and from 1983 it was used in the Ford Orion. The power figures I show are achievable and repeatable but not easy to get - they require state of the art head work and good cam design and you won't get them by buying a mish mash of bits from different companies and bolting it all together. It was later used in the as well as the and from 1983 it was used in the. Idling and initial engine response too will be greatly improved, and fuel consumption will actually improve if the car is driven in no more brisk a manner than previously. Valve Stem Seals Valve stem seals often harden and start to pass excessive oil, causing a smoky exhaust after the engine has been allowed to over-run. Capacity increases are also well worth considering if you want good power but without losing low end tractability.
Compared with 40 cars now and double the production. Then position it as central as you can and nip the bolts up. It's important to remember that if fitting a free flow exhaust manifold, you must ensure that both the gaskets and manifold line up accurately with the cylinder-head face, so you may have to relieve metal to achieve this. Here's a chart to make it all a bit easier to read. Outside, a valve cover with cooling fins made of cast aluminum was used instead of the metal cover. There are not many differences from the 1.
However, the ignition system was somewhat vulnerable and many workshops were overwhelmed with this then-novel technology. This tended to cause top-end oil starvation and the tortured mechanical noises these engines were known for. These are manufactured using a pressure cast method, which makes them considerably stronger and more expensive than the normal cast pistons. Compression Ratio So far we haven't changed the compression ratio of the engine, and for good reason. Consequently the correct preload isn't generated and the engine won't rev as high as it ought to. It should just slide into the bore with no appreciable rock. This engine is also a non-interference design.
The differences are not major though and a tuned road engine will produce perhaps 5 bhp less than a similar hemi engine. The bottom end is pretty strong although there is a rev limit of 6,000rpm but this is more to do with the lifters rather than the rods — better bolts ensure they are safe anyway. It also featured , a first for a European Ford engine. In some cases, the valve seat is drawn from its cylinder through the intake manifold into another cylinder until it is obliterated. Fix a worn cam problem properly and you'll get as good a life out of the new one as you did from the original. Standard Mahle pistons will go to 10.
Somewhat surprisingly, four-speed Escort Pony models achieved better mileage than five-speed cars, with upwards of 30 mpg in city driving and 40—45 mpg on the highway not uncommon. It also includes special high quality stem seals which won't go hard like the standard Ford ones and thick spring seat washers machined from steel bar which properly locate the inner and outer spring and sets the correct preload for high rpm use. As It offered little improvement in terms of either performance or economy over the older Kent engine which was cheaper to manufacture. These engines usually drop a valve seat with no warning, even if the engine has been well maintained. The pistons dropped the compression ratio to 8.
Standard Mahle pistons will go to 10. The exhaust valves are actually far too big as standard. It has a single belt driven overhead camshaft operating hydraulic tappets and pressed steel rockers. The 90 hp 67 kW 1. This problem is also seen in 1991-2002 Ford Escorts. Janspeed in particular produce a very good system which when fitted, can give you as much as 12 - 14% improvement in power output. It was later used in the Ford Sierra as well as the second generation Ford Fiesta and from 1983 it was used in the Ford Orion.
This is nothing to do with the urban myth about cylinder 4 being furthest from the oil pump. You'll score the lifter bores and ruin the oil pressure to the lifters. Pre 86 hemi head - 43. With the factory valve seats, the typical life of the 2. Keep in mind, though, the American Fiesta is not the same as a European Fiesta. It was expected to be a replacement for the Kent Crossflow engine but this did not disappear and lives on in various modified forms. It just means that Ford has already realized some of the power potential inherent in the engine design for you and that power increase per £ is going to be less for the same tuning work.
The cylinder block is cast iron, with five main bearings. These engines are very cam-timing sensitive and really do need a vernier pulley to see the best. They were particually successful with Escorts for rally. This is based on the hemi engine so deduct 5 bhp for a lean burn in the same state of tune. The springs aren't located correctly and usually either the inner or outer spring goes coilbound long before the other one. Crankshaft and connecting rods were identical to the lesser 1.