Piper cam question

[speed_devil]

Hi everyone
I bought Piper cams second hand (or at last they told me they are piper ones) which are 264/262 and 9.6/9.8 lifted. Anyway, i bought a thinner head gastek and skimmed the head a little(the skim+gasket=1mm down the head), ported and polished the head...so far so good. But when i started the car the idel was like normal and it wasn't lumpy. The car isn't remapped but goes better tha before and it starts pulling strong from 5k to the 7500limiter. My question is why my idel isn's any lumpy ? Is it possible that i bought standart cams ? Or the profile of those piper cams is too "soft" ?

[Tony]

Is this for the VTR and what year of car?

[speed_devil]

It's 106 rallye s1 with 16v conversion from 3 plug saxo vts

[Sparco_Tom]

the end of the cam will have a stamp, logo or marking saying what company its is or what model it is. take a look. not all cams cause a lumpy idle unmapped even 708's and ph3's can have a smooth idle if timed correctly

[Tony]

It is weird but I do know of a guy who drove a cammed VTS without a remap.

You should notice an extra gain with a remap.

But regarding finding out what cams you have will be hard without looking at the end on them afaik, and that is obviously hard in itself.

[speed_devil]

is there a way to see it with only taking of the cam covers ?
And what is the stamp of the standart cams ?

[Liam_]

Depends how you've timed the cam in tbh. If you used the standard timing marks, then most aftermarket cams will be quite lumpy on the valver engine.

[speed_devil]

today i took off the cam covers and there is :
CS16.030.094.260 stamped on the intake valve
CS16.094.260 stamped on the exaust valve
any ideas what valves are these ?

[speed_devil]

Sorry i mean cams not valves, my english is very bad

[Sparco_Tom]

isnt 260 standard?

[speed_devil]

yes can anyone tell what are the standart part numbers ?

[Tony]

Got this from the Piper site which may help:

http://i106.photobucket.com/albums/m253/wolbeoj/Pipercams.jpg

[Tony]

Yours could be the Fast Road ones at the top.

[speed_devil]

hah, they aren't piper at all as i see....
any ideas please ?

[williamsvts]

measure the base circle, then measure the length of the lobe and subtract the base circle from this.

standard cams have lift of 8.49mm, so anymore will be aftermarket. but mild aftermarket cams dont have a lumpy idle anyway,

[williamsvts]

isnt 260 standard?

nope, 708s are only 258 degree, think newmans ph3 are 264?? or 262??

[Sparco_Tom]

oh right i seee

[speed_devil]

measure the base circle, then measure the length of the lobe and subtract the base circle from this.

standard cams have lift of 8.49mm, so anymore will be aftermarket. but mild aftermarket cams dont have a lumpy idle anyway,

is it possible to do this without thaking the cam off the engine ?

[williamsvts]

probably, turn the cam so a vlave is fully open, this way you should be able to measure the base circle, then turn the cam 90 degrees so you can measure the lobe length. you'll need a vernier caliper to do this.

[speed_devil]

thanks very much for the advice. And please if someone can tell me what cams i bought because i'm really mad :wall:

[Tony]

Call up Piper on Tuesday and read them the numbers you found on your cams to see if they are actual Piper cams or not.

[speed_devil]

the cams are Colobmo & Bariani, but my exaust cam didn't exist in the catalogue.
And i have a questin - the intake cam is 9.4 lift with 260 gradus
the exaust cam is 9.0 lift with 270 gradus
Why is the exaust gradus bigger what the intake ? I can't see the logic :confused:

[RJE]

what do you mean by it idling about to stall?

[VTRlaa]

The 260 and 270 figures are degrees figures, or in other words a measure for how long the cam leaves the valves open.

The 260 degree cam is used in standard production for the VTR/S, while a 270 is for fast road use, then you can go up to full race specs at 300+ degrees.

These figures relate to all cams no matter what make piper, catcams whoever they will all be stamped with those degree ratings.

Please correct if Im wrong - Cheers

[speed_devil]

i see there is missunderstand so i'll start a new thread

[n123]

the standar saxo cams have a duration of 205 deegres if i'm not wrong

[speed_devil]

the standart saxo cams have 212 duration with 8.5 lift at 0.1 wich means 252 duration

[VTRlaa]

oops sorry thats how i read it off pipers website

[n123]

the standart saxo cams have 212 duration with 8.5 lift at 0.1 wich means 252 duration
why? if the cam has 212 duration why dependind on the lift would have more or less duration?