2200SC, unusual noise

[JVY]

There has also been past discussion on the forum about the timing marks on the crank pulley on P6's being inaccurate. So, unless you know that your timing marks are properly calibrated against actual Top Dead Centre, is it fair to say that the figure you think you have it set to could be a little academic?

[robgee1964]

Well the way I see it, the acid test is how the engine drives and sounds. I may try dialling in a bit more advance and then turn it back if it shows any signs of pinking. Its running quite acceptably at present though.

Have many engines been found to have inaccurate pulley marks? I guess I could verify them by using the flywheel marks as a reference, unless they are wrong too?

[darth sidious]

There has also been past discussion on the forum about the timing marks on the crank pulley on P6's being inaccurate. So, unless you know that your timing marks are properly calibrated against actual Top Dead Centre, is it fair to say that the figure you think you have it set to could be a little academic?

Ah, I thought that issue was on the V8's, not the 4-pots.

So in essence of that being so on the 4-pots too, the 'wrong' setting might be 'right' overall?!

[JVY]

If it helps, I think this was one of the threads I recalled that mention 4-cyl timing marks.

http://www.classicroverforum.com/viewtopic.php?f=2&t=9947&p=73955&hilit=timing+marks#p73955

If you wanted to check that your TDC timing mark is correct, there are different ways to do it (E.g. wooden dowel down no.1 spark hole). Also, with modern fuels that have a lower 95RON rating, they are going to tend to resist pinking less than the old 4 & 5 star. Therefore, it makes sense for the timing to be retarted a few degrees less than 8BTDC. I reckon that my timimg marks are good to +/- 0.5 degrees and keep my timing set at 8BTDC. However, I nearly always use Shell V-power (97RON) and add Castrol Valvemaster (LRP and octane booster). I have no idea to what value above 97RON the booster makes the fuel but this setup works fine for me on my 9:1 2200TC.

[chrisyork]

Going back to the inlet manifold sleeve - Ian has one on Ebay at the moment:

http://www.ebay.co.uk/itm/ROVER-P6-SC-AUTO-CARB-ADAPTOR-PLATE-NOS-/350496420403?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item519b36f233

So you can see what it looks like.

Chris

[darth sidious]

If it helps, I think this was one of the threads I recalled that mention 4-cyl timing marks.

http://www.classicroverforum.com/viewtopic.php?f=2&t=9947&p=73955&hilit=timing+marks#p73955

If you wanted to check that your TDC timing mark is correct, there are different ways to do it (E.g. wooden dowel down no.1 spark hole). Also, with modern fuels that have a lower 95RON rating, they are going to tend to resist pinking less than the old 4 & 5 star. Therefore, it makes sense for the timing to be retarted a few degrees less than 8BTDC. I reckon that my timimg marks are good to +/- 0.5 degrees and keep my timing set at 8BTDC. However, I nearly always use Shell V-power (97RON) and add Castrol Valvemaster (LRP and octane booster). I have no idea to what value above 97RON the booster makes the fuel but this setup works fine for me on my 9:1 2200TC.

Thanks for that. Oh blimey! I suppose expecting reasonably accurate timing marks on the pulley was just too much, aye?!

[robgee1964]

Thanks for that. Oh blimey! I suppose expecting reasonably accurate timing marks on the pulley was just too much, aye?!

I wouldn't lose too much sleep over it just yet, both these engines I've got here seem accurate enough. That is to say, the one out of the car is so loose I can get it to TDC by feel. The fact the one in the car is consistent between the flywheel marks and pulley marks, leads me to presume the marks are accurate, as it seems rather unlikely that both would be out by the same amount.

[Adam Birch]

I'm not wishing to scare anybody, but I'm gonna say I don't think it's the first time someone has related back to this post, on the forum:
viewtopic.php?f=2&t=5762

We'd all hope that I'm wrong in suggesting this though.

Cheers, Adam.