Cam Timing
Turbo Mini Forums

Hi

Can someone please help me, I would like to know how to time the cam in. I have a plunger dti and 360 degree protractor and am running a avonbar phase 2 turbo cam and vernier timing gears

thanks for any help

There are a few books that explain this very well, Vizzard for one.

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

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If thats ALAN WILKINSON

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(small world) buddy

go for the cam timing LOL!

Edited by BENROSS on 26th Mar, 2005.

got a question...

i got the crank at TDC (cylinder 1 with a DTI) - i noticed that the dot on the crank gear doesnt line up with the 'virtual line' between the centre of the crank and cam shafts. Its not 180 or 90 out but around 5-10 degs. How come?

Have you got it one tooth out on the chain?

<Edit>

No thats bollocks I just read your post again......

What gears are you using? The std ones do vary quite a lot, when I used to race in class one autograss you were only allowed to run std timing gears, but by sorting through a load of second hand ones you could time in the cam to what you decided by selection.....

Edited by Tom Fenton on 27th Mar, 2005.

if its a rubber damped pulley they can move round im lead to believe.

hence proper timing setting is harder sometimes than just pointing it at the crank pulley. these bits need to be checked on the build up as you've noticed

i havent put the cam wheel on yet, i was trial fitting the crank wheel at the time and it kinda stood out as not being inline.

it must be a tooth out mike

ahh, i thought you meant timing marks, oops!

i'm using verniers, but i ONLY have the crank one fitted at the mo, with cly 1 at tdc, the key is at 12 o'clock as expected, now when the crank toothed gear is fitted that dot 'should' be along the line between the centres of the crank and cam shafts y?

????

all i can say is find TDC on piston N01

appoint a protractor and follow the steps in the vizard book for timing cams in

as long as its timed in correctley sod the marks

well thats what common sense was telling - as long as its at tdc and the cam timing is correct then all should be ok, doubt set in and i was wandering if i had something wonrg.

I'm heading back out and i'll let u know how i get on :)

as long as you hand ball the engine around mike and nothings binding!

if you have made an error you will not hurt owt buddy

ok, think i'm there now.. feel free to flame what i did is i'm not an expert on these things...

the phase2 has full lift at 108 degs, so i set no.1 to TDC, put the timing petractor on the nose and turned the engine over to 108 degs ATDC. I then removed the vernier bolts so the inner portion can rotate with the cam while the outer section stayed still with the chain on it. Then i rotated the cam until full lift was achieved on the pushrod for intake on no.1 clylinder and tightened the vernier bolts.

that sound ok or have i screwed up?

Edited by Mike on 27th Mar, 2005.

nearly spot ON mike 99.9%

you must make sure that you determine full lift on the cam profile EITHER side of the profile of the cam

to make sure you have full lift correctley

at 108 deg ATDC

hope you understand how i have explained it mike

go say to 120 deg ATDC and BTDC either side

and make sure its full lift as you say

it dont hurt at all to CHECK AGAIN your findings

make sure your adjustable sprockets tightend up correctley

and say a smidge of stud lock to complimend a job well done on the fastners

kind of peice of mind!

so find full lift, turn engine say 4 degs each side of full lift note the drop in lift with the DTI. So in theory the drop should be the same 4 degs either side assuming the lobe is symetrical?

spot on mike

adjust from there to get the timing spot on