M11 or ISM

D.Weber · 10-14-2011, 07:18 PM

I'm looking at two coaches and getting close to making a purchase. One has a 400 HP M11 and the other a 450 HP ISM (M11).
What are the Pros and Cons of each?
Will fuel mileage between the two be that different?
I realize the the ISM will probably be a better choice for higher altitudes.

Opinions, Advice, Experience?

Thanks,
Don

dashdriver · 10-14-2011, 08:44 PM

One is a mechanical engine and the other electronic. I have the ISM and it's done a fantastic job. The one nice thing about the electronic version is being able to run VMSpc off it and have a good stream of data available about engine performance.

Steve Ownby · 10-15-2011, 09:13 AM

Don,

I have an ISM in my coach and I can't imagine a more trouble free engine. It has a great power to weight ratio and the fuel economy is really good. The M11 had a good reputation also, so maybe you should look to other coach differences to make your choice.

Good luck,