Discussion
Went on a Volvo coach to the seaside yesterday, beautiful new machine and It was very impressive, nice I-shift gearbox too. I sat right at the back over the engine, and it was as rough as a badgers bottom. It actually felt like a massive 4 cylinder owing to the lumpiness and vibration.
To my horror the driver told me it was a V12. I thought they were supposed to be a smooth as an engine can get, in perfect primary and secondary balance?
Does the length of the crank and cam cause that level of vibration in such a large engine? (13-16 litre)
To my horror the driver told me it was a V12. I thought they were supposed to be a smooth as an engine can get, in perfect primary and secondary balance?
Does the length of the crank and cam cause that level of vibration in such a large engine? (13-16 litre)
jamieduff1981 said:
V12s run great at much larger sizes. The RR Griffon was 37litres.
It's possible to get the crankshaft design completely wrong but that's almost more effort than getting it right.
It may be (likely) that the driver was mistaken.
I though about that, if he was mistaken then it would of at least had to have been a straight 6 which would probably be just as smoothIt's possible to get the crankshaft design completely wrong but that's almost more effort than getting it right.
It may be (likely) that the driver was mistaken.
Unless it's a 5 cylinder they are popular for commercial applications. I've never found them to be rough though, but at large sizes I guess they could be
Some great informed replies thank you.
Im starting to have the opinion it is unlikely to be a V12 and that he would have been mistaken, but I doubt he would have lied, didn't seem the type.
I had not considered cylinder de-activation technology making a 6/12 cylinder run rough, nor the amplification of vibrations through such a large object.
One thing definitely making me doubt it was a v12 was that apparently on the trip (Very light traffic flow) it managed to average just over 11MPG, which I thought all things considered was pretty remarkable.
I could definitely feel the Volvo I-shift was an automated manual rather than a traditional torque converter auto. There was a gap in power during shifts and reverse and first were very jerky
Im starting to have the opinion it is unlikely to be a V12 and that he would have been mistaken, but I doubt he would have lied, didn't seem the type.
I had not considered cylinder de-activation technology making a 6/12 cylinder run rough, nor the amplification of vibrations through such a large object.
One thing definitely making me doubt it was a v12 was that apparently on the trip (Very light traffic flow) it managed to average just over 11MPG, which I thought all things considered was pretty remarkable.
I could definitely feel the Volvo I-shift was an automated manual rather than a traditional torque converter auto. There was a gap in power during shifts and reverse and first were very jerky
Mr2Mike said:
As spaceman said, are you sure the driver didn't just say it was a B12 (which is the model name of a Volvo coach) and you misheard?
More than likely I am a bit mutton!I had to ask what a coach was limited to and he said 62MPH. Because one day coming back from work in my van up a steep incline on the A505 I was overtaken by a National Express coach that was doing at least 80MPH up the hill!.
He says they take their limiters out, then risk police action by not keeping the tacho
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