saff cos stage 1 chip mongoose standard cams what should it rev to 4.5 thousand seems to be about it did alot of work to it including change rotor arm didnt drive it for 12 months properly after now i cant remember what it should do might have been given wrong rotor arm didnt get of specialist i would be most greatfull for any advise

 

Should go alot higher than that i think about 6,500

 

They don't make peak bhp on std cams till around 6400, so going to rev to around 6700 at least.
Is it the same rpm in each gear it is limited to ?, DON'T work the engine hard(boost) until this is sorted in case it is a fuelling issue, could leave you with a dead engine!!
If it runs perfect up to 4500 then it's not the rotor arm, what gap are you using on the plugs ?, they work best around 0.6mm, not the 1.0mm ford state, mine wouldn't even start with that gap!!
When was the fuel filter last changed, if not within the last 2 years change that anyway, have you rewired the fuel pump ?, if not do that, needs doing on any cossie even std power ones, as well as the fan rewire.
tabetha

 

ive changed head gasket timming belt re wired fuel pump(didnt check voltage though) changed rotor arm i now the work carried is good im professional mechanic some rotor in the 80 s have built in limiter i wonder if iv been given wrong one might order one tomorrow is it best to check pump voltage when engine is running where the wires connect to pump if i stand on the go go pedal in neutral should it rev to about 6.5 and hear the noticable sound of limiter bouncing evan a poor mechanic shouldnt get timmeing wrong its so ovious putting the belt on if its a tooth out on top or disi s wrong it spot on on bottom two marks up against each other some times i try putting them on a tooth out as aprecaution i dont think its possable on the cos or i need lessons it seems to run very well its clean all the way through they tell me theres 3 foot flames out back when changing up when going for it i didnt check plug gaps getting coplacent working on west country tractors ive never worked on performance cars before more attension to detail i think i have done atemp repaire on fuel line near injector rail a bit of feul hose two clipps you now the one is it loosing fuel pressure with that thanks for the replies its great

 

Is it proper fuel line? If the pipe is not designed for fuel it will deteriorate and kink up causing a restriction in the fuel line. 6250RPM is peak for a Cosworth, it may be true that the cams don't peak out till 6400 but boost does at 6250. If it sounds sweet up till 4500RPM it isn't cam or ignition timing. Did it do this before the chip was fitted?

 

LOL it's not a diesel, it's a high revving race bred engine! Standard software cuts fuel injection (Hard cut) @ 7K RPM so that gives you some idea, these are electronically limited, there is no mechanical restriction in the dizzy!

The fuel pump voltage needs to be checked UNDER load, i.e when giving it a boot full in 3rd as this is when the pump pulls more power, as said also at the minimum (Check the fan wiring to make sure the fans actually work) but ideally rewire, these are two chronic weak points!

If it revs cleanly in neutral then it's possibly fuel related.

Martin

 

chip was all ready done had car for 8yrs cant remember what it should go like havent driven it prop 18 months used proper fuel line when i floor in neutral what should rev to thanks

 

what should it rev to in neutral throttle on floor boards some early fords had rev lim built into rotor arm didnt say mechanical thanks for adv ps re wired fan as well

 

So it did use to go alright? Well, safely in the 6000's somewhere but certainly more than 4500, peak performance is 6250RPM. Check your fuel pressure.

 

im sure the rev counter used feking bend all the way arround nearlly its still fecking rapid im sure it had more not driven it prop for 18 months martin said check pump volt at full chat be good idea check pump pressure at fuel rail if i rememb rit there is atake of for this could try to put a dial tyre pressure gauge on it but by that im only fecking guesing ive allways kept serviced prop apart from plug gaps it might be a case of all these small fecking puppy dogs make one fecking big one

 

Look at the rotor arm, does it have a sprung loaded movement limiter built in ?, NO SIERRA COSSIE EVER DID, have a rev limited rotor arm, so if it's wrong change it.
Frankly speaking I can't see ANY petrol car engine being limited to 4500rpm.
The fact it revs clean stood still means NOTHING, it could still be ignition, or fuelling, my moneys on fuelling, with the flames, this is indicative of very rich running.
The most obvious thing has been overlooked, the rotor arm/dizzy doesn't just deliver sparks where needed, the dizzy also has a phase sensor, if this is out, it goes into melt down fuelling wise being monstrously rich.
Line the cams up, with the LUG nearest the V in the pulley, NOT the v mark, then check the rotor arm is 100% centred with the scribed line on the dizzy body visible under the heat shield that sits on top of the dizzy body and gets clamped by the cap.
Have you defo lined up cam timing with LUG nearest the V groove and NOT the V groove itself ?.
Ford quote max power of 204PS(not bhp) at 6000rpm, taken directly from my ford sales brochure, but reality is different, taken directly from my rolling road printouts with STD cams, head etc peak was on mine last time 6439, but previously on GGR chip(and crappy L6 ecu) peak bhp was 5591rpm, most I've seem were nearer 6000 peak bhp, but that's not the issue anyway.
tabetha

 

i like you you now what your talking about ive read some of your links going back a few years im on holliday next week going to get stuck in im of to classic ford show sunday im going to start from beginning good set of plugs change rotor new cap check timming againe im pos its rite if no good guna wire pump direct to bat if still no good check pump and pressure ps if dizi & rotor is lined up rite does that make the phase sensor rite if i have probs is ok to email you thanks tabitha ray i only started emailing last friday im a bit shit if so where do get your email ad from not being pushy or owwt takes me fecking ages to type this fecking shit out getting fecking slower than fecking quicker thanks

 

I have pm'd you my email addy, as the rotor arm is keyed to the shaft, and the shaft has the 2 lobes on it for the phase, if the rotor arm is aligned correctly then the phase must be correct, the scribed line has to fall dead centre in the "path" projected by the rotor arm, even just 1 notch off will cause issues big time.
You would get a far better response from myself via pm, just click on the name, and it gives the option to send a private message, I don't check my email every day, sometimes only every 4-5 days, so pm a lot better.
tabetha