my cam timings
Turbo Mini Forums

i have timed in my phase 2 cam. i have bought the kit so new followers have been fitted. im using the mini sport ultra light timing gears. the times are as follows;

btdc = before top dead centre
atdc= after top dead centre

btdc 110
adtc 120
tdc 115

piper recomend 110 deg so this would mean my cam is out 5 deg. i know 5 deg is quite a lot but how much power and performance would i loose.

cheers

If in Doubt, go flat out !!!

Not sure what your saying, but if the instructions say to time it in at 110deg, then inlet no.1 should be at full lift when the crank is 110 deg btdc.

Phil.

WWW.TURBO-MINI.COM

yeah sorry. i havent got a verneer timing gear so all i have done is mach up the dots.when checking it with the protractor it is 5deg out.

If in Doubt, go flat out !!!

Ah !!! Well you need to get yourself a woodruff/offset key so you can set the timing correctly. They are available in offsets of 1-9 deg. I would suggest advancing it a couple of degrees to allow for chain stretch. You don't want the cam timing retarded at all though.

Phil.

WWW.TURBO-MINI.COM

The numbers you quote seem a bit odd. What method are you using?

I use this method:

http://www.minispares.com/Article.aspx?aid=68

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."

thats the same method im using. i even used keith calvers method. have i done somthing wrong then? what is a woodruff key?

If in Doubt, go flat out !!!

Available from MS

http://www.minispares.com/Product.aspx?pid=38172

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."

You know the key that sits in the cam and the pulley slots onto ? Well it's one of these that is offset, because you don't have a vernier you can use these keys to obtain the correct cam timing.

Phil.

WWW.TURBO-MINI.COM

Hi,
Your doing it correctly, it's just the labels you've put on the figures that look strange. A 5degree offset key will be correct. When it's in the correct way round you should get 105 on the upstroke and 115 on the down stroke, giving you 110 in the middle, which is your cam timing
Cheers,
Gavin :)

Edited by Bat on 3rd Mar, 2006.

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My Mini build diary

I have read one or two degrees doesnt make much difference. However for every degree after that it is said to account for losses as much as one bannna per degree.

This theory always seemed high to me though

AVONBAR do a set of offset keys 3,5,7,9.deg as a small packaged set
jugling these leading or losing will ensure you get it spot on

dont forget to order a timing disc as well!

dont rush this & remember have fun and enjoy doing it you learn better that way.

doesnt the phase 2 have to be timed to 108 degrees?

i used the instructions on the timing disc and tom tips!
do a search.

lets see if ive got this right if i havent somebody please tell me as ive just done mine.

find tdc and set a pointer and disc to tdc.
put dial guage on no1 cyl inlet valve pushrod which is second hole inwads from water pump end of engine.
turn crankshaft clockwise till pushrod has gone right up and stops, record the degrees.
turn the crank further clockwise untill the push rod starts to go down record the degrees
your lift is the figure in the middle of these 2 measurments
i.e if the push rod stops rising at 110 degrees and starts to fall at 120 degrees your lift is 115 degrees.

does this sound right?

no longer a series, but still 1.3 turbo.

yes that is correct. exactly how i have done it. The information sheet that piper provided with the cam says 110deg not 108deg.

If in Doubt, go flat out !!!

I no i`m late on this post but the time gear you have is there a row of allen key screws on the cam pully ?

sorry i read the post and you have not got a vernier pully

try 2deg key

Edited by jimmy on 3rd Mar, 2006.

1293 Turbo mini

when you time the cam in i put a dia gauge on the piston to find tdc set time disc then turn engine clock wise to you are 10 deg before max lift take read then go over max lift to 10 deg add the two and then half it and that is the timing of your cam

1293 Turbo mini

phil you should have said atdc not btdc eg 110 atdc

always looking for them bigger bunches of bannanas

Oh shit, yeah well spotted. lol.

WWW.TURBO-MINI.COM

Like Turbo Phill said, if they say to time it in a 110, if your using a new chain, time it in 3 or so degrees before that to accomodate chain stretch (if its a new chain).

In other words, time it in at 107...

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

avonbar say 108 degrees
http://www.speedgenie.co.uk/avonbar/index.html

no longer a series, but still 1.3 turbo.

beware of timing chains

if possible get a renaulds one if they still produce these ?

i got one from minispares a ROLON one

& to be honest its JUNK!

theres more stretch & wear in a Very short time
than a washing line.

i wont be using one of those again.

anyone used a Rolon & found the same as me ?

righto, if avonbar say 108, if it were me id time it in around 105.

sorry about the confusion

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

I wrote a guide on how to do this, look in the "How To" section...............

Hey presto

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=4769

im getting confused. the leaflet from piper says 110deg so does tom in his write up, and other people say 108deg. which one is it? only i have got to order my woodruff key and i dont know the degree because of this confusion. mine is set at 106deg.

If in Doubt, go flat out !!!

It is not a set figure, it depends on the individual camshaft you have. So, the one I has was 110 deg.

Golden rule is to ALWAYS USE THE CAM GRINDERS SETTING UNLESS YOU DEFINATELY KNOW BETTER

So time yours in so that you get the CENTRE of the full lift period at 110 crank degrees.

If you are using a timing chain that is liable to stretch, you ideally need to ADVANCE the cam timing SLIGHTLY! to allow for a touch of stretch in the chain. Say 1 or 2 degrees MAX.