13 replies to this topic

[Birdie!]

any one know what deg. the timeing should be for a 1330 stage 3??? im shore its on hear but i just cant fined it.

thanks
birdie!

[MRA]

what cam is it ?

[Cooperman]

As it's a 'hot' engine you'll need to get it set up on a rolling road. As a guide to initial start-up, a figure of 6 deg to 7 deg BTDC should be OK until you can get the dizzy 'swung' at high revs.
What cam and what dizzy are you using?
If the compression ratio is over 11:1 don't go over about 5 deg BTDC until you get it set properly.

[MRA]

Do you mean the cam timing or ingintion timing ??

[Cooperman]

Do you mean the cam timing or ingintion timing ??

Ah, I had assumed he meant ignition timing.
A Kent cam is quoted as timed at 106 deg ATDC. A BMC/BL/Rover cam is quoted at 110 deg ATDC.
On performance engines I normally time 2 deg advanced from this to allow for the high initial chain stretch which happens during the first 2000 miles after which the stretch happens much more slowly.

[MRA]

I had assumed that he meant cam timing.... but I guess it could be either or both

Edited by mra-minis.co.uk, 24 April 2009 - 10:51 AM.

[Birdie!]

i have a kent cam shaft. not to shore about the dizzy ill have to check it. it was run on a rolling road and tuned by mini sport but im thinking of doing some 1:5:1 rockers so i just want to make shore i can get all i want out of hur.

[MRA]

You really must get the FULL spec of your engine including the dyno report that I would assume Mini sport would have, as this will give you your initial settings

[Birdie!]

You really must get the FULL spec of your engine including the dyno report that I would assume Mini sport would have, as this will give you your initial settings

right i have a
1330 stage 3
1275 a+ eng +3.44 gbox verto bendix gold
276 x-dirlld billet upgrade kent cam
dizzy electronic a+ yellow vac.
verto clutch
4 core rad
11 fan blade
su hif44 carb 100 thou needle
duplex timeing gear

engine power - 67.3 kw din70020 at 125km/h - 6972 rpm
wheel power - 54.9 kw
drag power - 11.6 kw
engine torque - 114.7 nm
max speed - 136.0 km/h
air pressure - 998 mbar
air temp - 17.5 oC
Odometer - 92 bhp

i think this is all i have so any help in the set up or thorghts on up grades would be good. thinking of 1:5:1 roller tiped rockers for the 20% more valve opening.

thanks

Birdie!

[Birdie!]

its ingintion timing by the way.

[Birdie!]

Bump! please help.

[Cooperman]

Whoever dyno'd the engine should have given you a figure for static timing.
So, without that you need to set it for initial start-up as if it was a new engine.
Personally, I would begin with a static timing of 6 degrees BTDC. It will definately start at that without any problem and without the risk of 'pinking' so long as you use Shell top-grade petrol.
Once it is running, you can take it to a rolling road for final setting-up, bearing in mind your wish to use higher-lift rockers.
If you don't know how to set the 6 degrees, come back on here, but I'm sure you already know how to do that.

Edited by Cooperman, 28 April 2009 - 08:50 AM.

[MRA]

So where are the initial ignition timing figures ?

This should have been one of your important nymbers from the dyno run

Without these figures its a guess, you should have had a timing plot for your engine, this enables you to get your dizzy advance curve fine tuned to cope with the engines ignition requirements.

This is like buying a car and being told that you can only fill up with petrol from us ( us being the company that did the power run)....... effectively anytime you wish to check your ignition youhave to take your car to a rolling road !

Since its been tested on a rolling road have you or anyone else changed anything, or any settings ??
How long ago was it done ?

You may be able to take a reading from your car to get a close figure..... but this is not ideal

[Birdie!]

thanks for your help guys notthing has been changed as yet just that it has been sat around for about 8 months and i want to make shore when i have done all the work it is as good as it can be. all the info that was on the paper im shore that i put on hear so im not to shore what to do then. do you thing it would be best to leave it and take it to a road to get it checked??? also is the high lift rockers a good idea and what would it realy give me??? i would like to get to 100bhp and i dont have far to go realy.