<html><div>Hi Rich,</div><div> The different distributors may have different springs, but those I have seen (don't know which distributors they were, though) had springs that seemed to me to be pretty robust, similar in gauge to the MGB springs. </div><div> One is typically slack on the pegs, the other on firmly though not stretched at all--can be wiggled. </div><div> Advance curve begins at low rpm, which is why you can't do 0 at idle, for example, as advance is already five or six or more degrees.<br> I don't see how the cam could have jumped---the tensioner is right on it from the beginning--does not need to be pumped up with oil pressure to hold the chain.</div><div> MGB people have been fussing about the slot not being milled in the right place, however, so it could be, I suppose, that yours is not properly placed. i did not think to check movement on the lobes when I installed mine--just did it per the TD manual and counted (about ten times) the links on each side of the marks.</div><div>Bob</div><div><br>---------- Original Message ----------<br>From: Rick Lindsay <richardolindsay@gmail.com><br>To: "mg-t@autox.team.net" <mg-t@autox.team.net><br>Subject: [Mg-t] Further to; Running, but not well<br>Date: Mon, 20 Apr 2015 19:45:27 -0500<br><br></p><div>Hi Friends,</div><div> </div><div>Update: With timing set to TDC (static) the car starts okay. On the timing light, actual timing jumps around quite a bit. Inside the distributor, the springs on the centripetal advance don't look right. They don't look like any advance springs I have ever seen. Small gauge wire and new-looking. Fitment is poor too. </div><div> </div><div>I have a set of springs from an E-Type. I'll put them in as a test, just a test. If the idle timing is stable, I'll order a correct set for proper advance.</div><div> </div><div>Lots of backfiring AND carb spitting when opening the throttle, if the timing is tweaked...even a little. </div><div> </div><div>Any way the cam timing could have jumped?</div><div> </div><div>Thanks for your ongoing support.</div><div> </div><div>-rick</div><div> </div><div> </div><div id="composer_signature"> </div></html>