csweatherston
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Registered: 16th Jan 06
Location: Devon
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on the x16, i belive both cams are identical (inlet and exhaust)...
would it give many gains changing either of the standard cams for a piper 256 jobbie?....
surely on the inlet it would allow a greater volume of air in for longer......improving torque???
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Griffin Autosport
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Registered: 25th Nov 06
Location: Co.durham
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yeah the inlet should give an improvement, it should have a longer duration and a slight higher lift!
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ed
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Registered: 10th Sep 03
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The cams aren't Identical. Otherwise the valves would all open up at the same time and the engine wouldn't work.
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RobHayes
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Registered: 6th Sep 03
Location: Lincolnshire
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the camshafts are the same, they are timed differently to stop valve opening at the same time
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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gains will be minimal, maybe 2 bhp if you are lucky. problem is that the map or cam timing wont have been adjusted to suit and the overlap between the inlet and exhaust cam with them being different profiles might mean that you may even lose power. it would also probably run slighty lean as the valve being open for longer will mean more fuel/air is available but the injector duration wont be any greater. if you have an adjustable fuel pressure regulator you could increase the pressure slighly (not ideal as the duration is more important) but can only be done properly on a RR with a wideband lambda probe
I always map road cars to run slightly on the rich side as the more fuel, the cooler/safer the engine will run a lean engine will be hotter and more prone to engine damage.
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Dave A
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quote:
Originally posted by RobHayes
the camshafts are the same, they are timed differently to stop valve opening at the same time
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csweatherston
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Registered: 16th Jan 06
Location: Devon
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and if i was to use the cam on the exhaust side?
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Griffin Autosport
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Registered: 25th Nov 06
Location: Co.durham
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i have not looked at the spec of these cams but going off the profile i'm guessing they are reprofiled cams? if so they are profiled to run with all standard parts and maps, if the fueling is low the lambda should pick this up and alter the injector cycle accordingly. these aren't wild cams so there should be no running problems at all.
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Dave A
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Registered: 10th Dec 03
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not a lot. but again, pointless unless you do it on a rr and set the cam timing with a vernier.
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csweatherston
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Registered: 16th Jan 06
Location: Devon
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...as i thought griffin....
i know they shoud ideally be used as a pair, but un fortunatly i only have the 1 lol
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Griffin Autosport
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Registered: 25th Nov 06
Location: Co.durham
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if you have the inlet put it in it'll be fine
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Dave A
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why bother?
it cant be dialled in and could cause the engine to run lean.
I will put a fiver on it that fitting the inlet cam with no other mods and fitted timing and fuelling not adjusted that it will lose power if anything.
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Griffin Autosport
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Registered: 25th Nov 06
Location: Co.durham
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its never going to do that when its designed to run with a standard engine (if its reprofiled) i have fitted reprofileds before and never needed to change the fueling, reprofileds are also designed to be fitted in the standard timing marks, the same also goes for high torque cams.
If piper tell you they not reprofiled and need to be fiited with verniers then thats how its done, if not then leave it!
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csweatherston
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Registered: 16th Jan 06
Location: Devon
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erm...i think ill just keep it as a mantle piece then..........
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Dave A
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Registered: 10th Dec 03
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quote:
Originally posted by Griffin Autosport
its never going to do that when its designed to run with a standard engine (if its reprofiled) i have fitted reprofileds before and never needed to change the fueling, reprofileds are also designed to be fitted in the standard timing marks, the same also goes for high torque cams.
If piper tell you they not reprofiled and need to be fiited with verniers then thats how its done, if not then leave it!
so with standard timing marks and standard fuelling explain what the gains are in fitting this cam.......
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ed
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Registered: 10th Sep 03
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ECU will up the fueling and allow the car to burn a bit more...
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Dave A
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but then you are relying on the notoriosly crap vauxhall lambda sytem
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ed
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Registered: 10th Sep 03
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Not ideal, but as you say, the gains are going to be minimal. If it was mapped properly then it would be a bit more worth while.
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mattievRS
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Registered: 20th May 06
Location: Leicester
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Lads, id like to here eels opinion on this?
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ckallis500
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Registered: 14th Dec 04
Location: plymouth
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the piper 256 re-profiled cams are suppose to give 10-12bhp on an other wise standard engine, this is what piper quote. i would put it in the inlet side callum, your gonna get it mapped at some point in the future anyway arent you?
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csweatherston
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Registered: 16th Jan 06
Location: Devon
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duno yet mate......i have no plans on putting it into mine, just some evidence for potential buyers.....
sum1 offerd me £15 posted for it 
may not get mine mapped just yet......may wait untill i can afford a decent management system.
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