23 replies to this topic

[adamt117]

Currently rebuilding my engine and i am fitting a megajolt ignition system. I've got a new crank pulley with the trigger wheel machined into it but it doesn't have a damper. I know its meant to be there to reduce vibration. Just wondering if it will do any harm to run without the damper?

[yeti21586]

ooooh were did you get your wheel>??

im going to be megajolting my engine


YetI

[danrock101]

imo yes, you'd be silly not to

[adamt117]

ooooh were did you get your wheel>??

im going to be megajolting my engine


YetI

I bought a kit from SD minis a while back it came with everything. Coilpack, edis unit, ecu, ht leads, trigger wheel, sensor and sensor bracket

[adamt117]

Is it possible to buy an aftermarket damper and fit it to my pulley because there is two threaded holes on the face. Could these be there for a damper?

[danrock101]

I think MED do one but it's not cheap and I'd think you'd have to use their pulley

Edited by danrock101, 05 December 2010 - 09:13 PM.

[Dan]

A harmonic damper is absolutely essential on the A series engine, the 3 bearing crank develops all sorts of odd frequencies that can easily destroy it.

Odd for the pulley to only have 2 threaded holes, the conventional thing is to use the Cooper S damper ring which fixes on using 4 screws not 2.

[mike.]

I have the same MJ kit without the damper. I've heard of people removing them before without problems.

[MRA]

crack propogation can be slow to start but without a damper it will definately start, failure will then be a matter of time

[liirge]

Am i incorrect in thinking that 998's don't have a damper, just a pulley....same as the 850's

http://www.somerford...x...page&id=112

Edited by liirge, 06 December 2010 - 03:45 PM.

[l_jonez]

Yep pretty much all 998's didn't have them, a few of the very last ones (studio 2 1992ish) did but that probably because they had run out of pulleys so used some 1275 pulleys from the parts bin

[Spitz]

If looking for one......1098's had them also.

[MRA]

The 998 engine did have a dampened pulley, it is lighter than a 1275 damper...... about 1/4" thinner or so.

The 998 is also a shorter stroke crank with less power and torque being transmitted through it....

[l_jonez]

The 998 engine did have a dampened pulley, it is lighter than a 1275 damper...... about 1/4" thinner or so.

The 998 is also a shorter stroke crank with less power and torque being transmitted through it....

Out of the 6 998's I got sat in front of me only one has a damper and that's a later one from a studio 2


I have mounted several trigger wheels to 998 pulleys

Edited by l_jonez, 06 December 2010 - 04:48 PM.

[MRA]

Ok so is 6 really representative of the 5.28 million Minis made between 59 and 2001 ?

I was not saying that you where wrong in your statement, the early small bore engines did only have a steel pulley and no damper, however it is not just the later 998's that had dampers, I can think of at least 6 different types of bottom pulley that where fitted to the A or A+ engines