spookie

CVH
Introduced in the front wheel drive Mk3 Escort in 1980, the Ford CVH has been available in both normally aspirated (N/A) and turbo forms and it’s been tuned to produce daft power using both methods.

Most common capacities you’ll find are 1117cc, 1296 and 1597. However, the 1300 was dropped in 1986 and replaced with a 1392 (1400). This was also a significant year since the oil pump system was revised for use in the Mk4 Escort. The only rear wheel drive version was available in the Sierra in 1800cc format. Sierra engines were based on US-spec 1905cc units and share few components with the smaller CVH engines. However, their thicker block was popular with 1900cc conversions, particularly RS Turbos.

Cars you’re likely to find a CVH fitted to are, Fiestas, Escorts and the aforementioned Sierra. Early Mk5 Escorts carried the engine but it was phased out in favour of the Zetec. Ford’s early range also included the very special RS1600i, which differs from regular cars since it has fuel injection, solid lifters, plenty of motorsport features and the highest N/A power, 115bhp.


CVH stands for 'Compound Valve-angle Hemispherical' and as such featured a ‘Hemi’ type combustion chamber. But, there are differences because the later ‘Lean-Burn’ series has a heart type chamber so you need to be sure which one you’ve got – the only sure way is to take it off because casting numbers can be misleading. Either head type can be tuned although the ‘Hemi’ will generally give the most power. Your head will need inspecting since some feature oversize cam bearings and lifter bores.

The combination of a Burton Stage 1 head and a Kent CVH22, should release about 15bhp extra and you can use the best standard type carb from the XR3/early XR2 (Weber 32/34 DFT) in conjunction. These engines are very cam-timing sensitive and really do need a vernier pulley to see the best.
Stage 2 and a CVH 33 should see another 5-10bhp although you’re best now switching to twin choke Webers. Most common are DCOE side draughts – either 40s or 45s for more top-end power. However, these can cause space problems so the rarer DCNF down drafts are more suitable.

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’re safe anyway. We’d recommend solid lifters beyond the limit of 6,500rpm, which is when you really need to consider forged pistons too. Standard Mahle pistons will go to 10.2:1 by skimming the head although this needs to be checked to avoid valve contact. Accralites are recommended beyond this level although these are to special order only.
At this stage we’d also recommend our Farndon H-section rods and if you’re really serious a steel crank as well – however there are plenty of CVH engines racing with the standard cast crank.

Turbo engines are reasonably simple to tune to around 180bhp, which is normally achieved with a Bayjoo chip, -31 actuator, air filter and stainless exhaust. These modifications will allow around 1BAR of boost. Beyond this and you’ll need a larger intercooler to drop charge temperatures plus a hybrid turbo to hit 200bhp.
You’ll get a touch over this with a Kent CVH34 cam as well as reaching the limit on the standard pistons, for which we stock Accralites to better handle boost pressures. These come with finished crowns and a CR of 8.0:1 but can be machined for lower compression ratio.



31 RS Related / Tech Spot / Zetec e on: August 10, 2008, 03:05:54 pm Zetec E
The name Zetec is pretty confusing because it’s now used by Ford as a badge on the back to describe a level of trim. On top of this, there’s a smaller capacity Zetec – described elsewhere – plus, late Zetecs were made to look like the latest Duratecs.
Early, ‘Silver Top’ engines (with an aluminium cam cover) were fitted to Escorts from 1991 onwards, late Fiesta Mk3s and then the Mondeo. These early units were known as Zeta (only becoming Zetec in 1993). The unit evolved into the Black Top unit (with a plastic cam cover) with the Escort phased out and Focus introduction. These later engines have longer rods and lower piston crowns, mechanical rather than hydraulic lifters plus the distinctive black cam cover.

Initially there were 90, 105 and 115bhp 1800cc Escort versions, with 115 and 130bhp 2 litre Mondeo units too. There were also 130bhp RS1800 Fiesta/XR3i variations with revised cams and re-mapped ECU’s. The hottest n/a version was the ST170 with solid lifters, steel rods, waisted valves and variable valve timing (VVT). The motor went on to power the Focus RS but in turbocharged form. Both the ST and RS engines were confusingly re-badged as a Duratec.


As far as tuning goes, it’s simple to bring an 1800 up to RS1800 spec with Ford cams or Kent FZ1802 cams – you would need a 130bhp ECU though, or aftermarket re-mapping. A power boost valve will help eliminate the flat spot between 3,300-3,500rpm.
You can actually use the standard injection combined with a new Weber Alpha kit that works with the OE inlet manifold. Fitments are for the silver top 1800s, and both silver and black top 2.0 engines. Power achieved is, approx 150bhp for a 1.8 130PS and 160bhp for the 2.0. However, these are really the limit of the standard induction and further increases are not possible, unlike their other kits. It has to be said that although these kits have been developed for the kit car market, we do not see any reason why they can’t be fitted to a FWD Zetec engined car. Webcon cannot confirm fitment but like us believe it should work. If you want to go beyond the range of the standard induction though, we can supply a Weber Alpha kit, which replaces the system altogether and is incredibly comprehensive – all is there for you to bolt it straight on, including manifold, linkage, even air filters. On an 1800 130PS engine, you should see 155bhp and 165bhp on a 2 litre.
Either of these two systems will provide enough fuelling for plenty of future modifications. Fit one of our stage 1 heads plus a pair of Kent FZ2002 cams and you should see power around 185bhp. If you want to go beyond this ‘Fast Road’ stage then you’ll need our Stage 2 heads which feature larger inlet valves.
The Kent FZ2003 cams will give you between 200-240bhp depending on stage of head, coupled with 48mm throttle bodies. However, at this stage, you’ll need larger followers machined and installed, otherwise the cam lobe won’t be completely ‘seen’ by the follower. We’d also recommend a capacity increase to 2.1 litres, with an 86mm bore plus our Accralite pistons. The standard crank is very strong but around these levels we’d encourage the switch to steel along with our Farndon H-section rods.

The Zetec E is also a popular swap into a classic Ford usually requiring turning round to rear wheel drive format. We can supply all the parts you need to do this including the water rail manifold, which re-locates the thermostat housing, thus providing bulkhead clearance. In addition, we have access to engine mounts for Mk1 and 2 Escorts, correct orientation sumps, exhausts and everything you need to give your classic, modern 16 valve power.
(burton power.co.uk

clarke5700

good to no

pa_sjo

Blatent Burton advertising

MarkN

Burtons prices are outrageous for most things IMO. They can advertise all they like but I still won't buy anything there lol

The only thing I did try to buy from them was a CVH CPS Trigger kit. They didn't have any it stock but kept telling me they'd have them any day soon, but after weeks of being messed about I gave up. They still didn't have any a few months later when I rang up out of morbid curiousity - can't understand why they advertise things you can't buy.