View Full Version : valve clearances & cams
with aftermarket cams do you stick with the std .20 & .25 valve clearances? or should you be setting the clearances to something else?
i havent bought a new cam in years. still have a piper 260 which i bought years ago and that had different valve settings in the instuctions which where .25 & .30 wtf:confused:
i remember my old engine it was very tappy. would there be any harm in setting the clearances to .20 / .25 on my new build.?
They need to be set to the camshaft manufacturers specifications. Setting the clearance too tight or too slack can cause damage to the cam lobes.
What cam is it?
What cam is it?
its a piper 260 cam. i actually purchased it from ktec many years ago. i think they call it a power systems cam?
id also like to know what folks set there clearances to with whatever aftermarket cam they have.?
i havent heard much of the piper 260 cam, i actually sent this cam to andy when he was testing/measuring them and im sure he said it is has slightly higher lift compared to a std cam.
andy can you confirm this? would you possibly be able to suggest the clearances of the 260 with whatever info you have of it?
tiff_lee
12-11-2008, 23:57
Won't tight clearances just lead to burnt out valves rather than cam lobe damage?
come on folks... so with
piper cam /clearances
260.. clearances..?
270.. clearances..?
285.. clearances..?
300.. clearances..?
would be interesting to know if theres actually any difference in the clearances? and why there is or isnt any difference!
"Jeez man, this has been done to death over the years". "Search the boards". etc etc ad nauseum :D ;)
260/270 cam = o.e valve clearance (inlet: 0.15mm, exhaust: 0.20mm). (*)
285 (or Kent rt150) = inlet: 0.20mm, exhaust 0.25mm.
300 (or Kent rt200) = inlet 0.25mm, exhaust 0.30mm.
I very much doubt anyone could get them exactly to those clearance dimensions, so being 0.05mm or whatever out isn't really gonna make that much difference in the grand scheme of things.
* Awaits someone to argue that o.e clearances are inlet: 0.20mm, exhaust: 0.25mm... ;)
"Jeez man, this has been done to death over the years". "Search the boards". etc etc ad nauseum :D ;)
260/270 cam = o.e valve clearance (inlet: 0.15mm, exhaust: 0.20mm). (*)
285 (or Kent rt150) = inlet: 0.20mm, exhaust 0.25mm.
300 (or Kent rt200) = inlet 0.25mm, exhaust 0.30mm.
I very much doubt anyone could get them exactly to those clearance dimensions, so being 0.05mm or whatever out isn't really gonna make that much difference in the grand scheme of things.
* Awaits someone to argue that o.e clearances are inlet: 0.20mm, exhaust: 0.25mm...
thats the info i was after :) so std clearances it is for me :agree:................. which i believe to be and have always set @ .20 / .25 :D:p:confused: i do find this to make the engine tappy:ashamed:
can we have a poll or something to see who thinks std clearances are .15/.20 or .20/.25 :p or shall we just beat each other up?:D
Awaits someone to argue that o.e clearances are inlet: 0.20mm, exhaust: 0.25mm... ;)
So the Haynes manual has the wrong figures, i did wonder why my engine sounds a little tappy :)
Yep, the 2nd revision of the Haynes manual is wrong.
If you check the 1st revision and/or the o.e Renault handbook that came with the gtt's, it clearly states 0.15mm for inlet, 0.20mm for exhaust.
Raj, you lose ;) :D
So the Haynes manual has the wrong figures, i did wonder why my engine sounds a little tappy :)
the haynes manuals are on the p1ss:sad2: the green one says .15/.20 and the blue one says .20/.25 soooooooo???
this is all old news to me. i was just wonering weather different cams have different clearances :D
mart, which manual is the 2nd revision? i thought the green one came out after the blue one..? regardless of that ill be going with .15/.20 now :agree: maybe things will be a little quieter! just abit puzzled as to why ktecs instructions stated .25/.30:eek:
Ah, i have the blue one as well and didnt realise the values were different. Definately resetting them later today, hopefully it should run a little quieter :yeah:
On a standard cam it makes no difference if the valve clearances are .15/.20mm or .20/.25mm, my engines sound quiet on both settings.
The cup manual still says .20/25mm though;)
On a standard cam it makes no difference if the valve clearances are .15/.20mm or .20/.25mm, my engines sound quiet on both settings.
The cup manual still says .20/25mm though;)
ah i was actually thinking why the cup manual states .20/.25..??
also regarding the .15/.20 settings.. i recall i set my tappets to this many yrs ago and the engine ran rough so reset them to .20/.25 and was much better.
this brings me to valve train wear!!! which area is it that you should check exactly? would it be the arm face that actually makes contact with the valve top or the fingers that contact the pushrod?
Here you go - the specifications page from the Renault 5 handbook that comes with the car.
The confusion with the second edition of the blue Haynes manual is that the engine sections for the 1397cc and 1397cc turbo aren't as separate as they could be.
im being abit of a numpty here:rolleyes: but when you refer to 0.15, 0.20, 0.25 etc etc that is in metric yes? in mm yes.?
im only asking as ive got some feelers here that i can only just make out whats written on them in mm and if ive got the right ones then the .15mm and .20mm feelers are not firm but abit flippy floppy flimsy so to speak.?
Pretty sure I put 'mm' after the values I listed above...
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