Interesting Info on Piper Cams
Turbo Mini Forums

http://www.demon-tweeks.co.uk/resources/pdfs/PIP_CAM.pdf

Ive noticed my PH2 cam in page 4 at the top of the list!

BP255

For the timing it says 24-60? if this is correct then mine has been set way out! it was at 19-50 when off/on boost but the RR man sais it should be 7-24 so it was set to 16-45 cause he couldnt get it lower without it stalling.... and since, its been slower! maybe i need to have a chat with him to sort it out! as it was detting at santapod with it at 19-50?

Getting fed up with never finding a straight answer to why things like these happen :(

detting at 50@??? you should try the recommended timing at 24-60...
or better never touch again an engine !

i think your getting a little confused here between cam timing figures and ignition figures,

both are very different, one you can alter the other is fixed,

carl

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

yeah true, but im on about ignition timing?

i thought the bp255 was the ph2 seeing as the pieces fit?

the ph2 is a piper cam? (mine came in a piper box) avonbar ph2
it gives 8bhp increase
timed in at 108

so what does the 24-60 mean?

i thought it was how much the dizzy advances when off to on boost?

Edited by Rod S on 6th Sep, 2009.

Schrödinger's cat - so which one am I ???

if he didnt warn you that you could end up with holy pistons find a new RR guy,

Thank you Rod, and yes mini13 ive been told lots about this topic, and ive stopped using the mini untill its sorted, im loosing my faith in it :(

On another note, when i first got the engine running i was told to take the Vac advance off, rev engine to 3,00rpm and set the ignition timing at 8deg, but if the engine is set at this, it will for the love of god not run at all, the minimum it runs at is about 16 and when set at this, on the rollers with vac on, plus boost he said it was showing 44degress, but i have also been told that it shouldnt be 44, but nearer to 22?

what i want to know is what someone else has their dissy timing set at using the ph2 cam?

Cheers for straightening that out for me, i understand what those numbers are now.

All I would say is that if it's been on a Rolling Road with 44 degrees ignition advance (under full load) and is still in one piece,

(1) The RR operator should never have allowed it to happen, and

(2) Either the timing marks are way out and it wasn't really 44 degrees, or
(3) There is something else very basic wrong allowing it to run without self destructing at 44 degrees such as the cam timing (the 108 degree one) is miles out as well.

Schrödinger's cat - so which one am I ???

Maybe the damage is already done which is why it doesnt run right

the cam timing is set at 108 probably within a half degree of tolerance.

Its just baffeling me now, im starting to suspect that the equipment at the RR is faulty.

If your cam timing really is 108 degrees (ie, about right for whatever the cam actually is) but your ignition advance is actually going to 44 degrees under boost AND you say it was going to 50 degrees advance before the RR and you could hear detonation at santapod with it at 50 degrees (and presumably kept your foot down anyway) I tend to agree with Sprocket.

Have a search through the forum and see how many pictures you can find of pistons with no ring lands left because of detonation.....

Seriously though, first try to see what your ignition timing actually is - just check the TDC and timing marks on the pulley are accurate (you'll need a DTI and extension rod down a plug hole to do that) then see what the actual timing is with a strobe timing light at idle with and without the vacuum tube connected and then see how fast it advances as you blip the throttle.

In other words, check the basic settings first.

Schrödinger's cat - so which one am I ???

Cheers Rod and it detted in 4th so i let off to half throttle for the last second or two, really diddnt like it at all, tried getting the timing down at santa pod but still no luck. the mini is in bits at the moment, a (recon) turbo is on its way as the old one was completely fucked, dare i say i won a dizzy off ebay (sorry to those who were bidding) supposedly in working condition, so i get the turbo tomorrow and the dizzy whenever lol hopefully saturday..

So what should i set the ignition timing at without VAC at idle (approx 900rpm) ? i was told approx 7-8, is this correct?