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04-30-2016, 10:13 PM
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#1
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Junior Member
Join Date: Apr 2016
Posts: 10
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ISX vs ISL
I live in Colorado and have had an underpowered MH before. I am looking at Entegra and trying to decide between Cornerstone and Anthem. The major issue is the ISX 600 hp and heavier chassis vs the ISL 450 hp and lighter chassis. Does the extra power make driving the mountains that much more comfortable?
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04-30-2016, 10:54 PM
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#2
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: May 2013
Location: Nashville, IN 47448
Posts: 803
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When talking to some customers at the Entegra factory this past week they were pretty clear that an ISL is acceptable. The guy who said he'd driven one said that you could pass everybody going up the Rockies with an ISX but the ISL would hold at a steady acceptable speed. That was good enough for me not to spend 50 to 100K more.
Thats my two cents
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Bill & Jenny - 2016 Winnebago 42HD
2022 Vanleigh 39GSB - 2 BR Fifth Wheel and 2020 F450 / 2024 Jeep 4XE Rubicon…traveler in Midwest and Winters in Sarasota. Home - Nashville, Indiana (Beautiful Brown County)
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05-01-2016, 07:34 AM
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#3
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Moderator Emeritus
Jayco Owners Club RV Trip Wizard
Join Date: Oct 2009
Location: Poinciana FL
Posts: 7,781
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1250 ft lbs of torque vs 1950.
Yes, the 450 will do the job, but if I lived in Colorado I'd definitely buy the ISX, assuming budget is not an issue.
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Jay and Peggy Monroe
"Can't take it with you, not leaving any behind"
2024 Jayco White Hawk 26FK
2024 Ford Expedition
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05-01-2016, 08:03 AM
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#4
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Senior Member
Monaco Owners Club
Join Date: Mar 2015
Location: Fort Wayne, IN
Posts: 197
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Also look at Torque! Not just HP. You get 33% more HP with he ISX but 50% more torque! That's a lot more torque.
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05-01-2016, 08:21 AM
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#5
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Registered User
Join Date: Feb 2012
Location: Troy Mo
Posts: 1,951
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You get a lot more than just the isx when you buy the Cornerstone.
If you're having a debate with yourself then obviously the Cornerstone is within your price range. In that case there is no logical reason not to get the Cornerstone. However, if you're still undecided go drive both and I have little doubt which you'll chose.
I've had both and the isl is "acceptable", but the isx Cornerstone is so much more. Noel
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05-02-2016, 09:34 PM
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#6
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Senior Member
Monaco Owners Club
Join Date: Jul 2011
Location: B.C.
Posts: 4,638
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I would check the history and reliability of the ISX. There are a few on here on this forum that have had some major failures with them. I know a trucking firm that de rated their 600's back to 550 because of problems with them.
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Dennis & Marcie & Captain Hook The Jack Russell,aka PUP, 2006 Itasca 29R 2017 Equinox toad. RVM59
We came, we went, nothing broken, nothing bent!
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05-02-2016, 09:36 PM
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#7
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Registered User
Join Date: Feb 2012
Location: Troy Mo
Posts: 1,951
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Quote:
Originally Posted by slickest1
I would check the history and reliability of the ISX. There are a few on here on this forum that have had some major failures with them. I know a trucking firm that de rated their 600's back to 550 because of problems with them.
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Only ones I've heard of is the 650 with twin cams. Haven't seen any problems with the 600.
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05-02-2016, 09:40 PM
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#8
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by slickest1
I would check the history and reliability of the ISX. There are a few on here on this forum that have had some major failures with them. I know a trucking firm that de rated their 600's back to 550 because of problems with them.
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The new, SOHC do not seem to have the heat related valve breakage problem that the older '07 EPA CM871 DOHC ones did. And, supposedly, that problem has been addressed with new heads, valves, turbo and ECM programming. I guess with ours only time will tell.
The engine really doesn't care if you're going uphill or not, I have not found anything yet that slowed it down much.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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05-02-2016, 09:44 PM
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#9
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by loisjop
Only ones I've heard of is the 650 with twin cams. Haven't seen any problems with the 600.
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There have been problems reported down to about the 450 hp DOHC ISX's but those are in Class 8 trucks so you don't usually see them reported on RV forums.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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05-03-2016, 08:23 AM
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#10
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Junior Member
Join Date: Apr 2016
Posts: 10
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Thanks for the info
Thanks to all who have given me input on this, it has helped a great deal.
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05-03-2016, 05:42 PM
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#11
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Senior Member
National RV Owners Club Ford Super Duty Owner
Join Date: Dec 2013
Posts: 510
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Look at the displacement I think the ISL is 8.9L and the big ISX is 15.2L, I could be wrong but those are the numbers off the top of my head. I can say that I have torn both engines down to the blocks and reassembled them and if I had a choice I would get an ISX but my wallet and wants are two different things. Both are good engines.
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2008 National SurfSide 34E (Bunk Model) Ford V10
Sold- 1990 Hawkins Chevy P30 454
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05-03-2016, 11:24 PM
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#12
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Junior Member
Join Date: Apr 2016
Posts: 10
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Thanks for the info after an engine breakdown. Not sure I am going to be able to make the reach to the Cornerstone but sounds like it is worth trying to.
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05-03-2016, 11:37 PM
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#13
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by DDDonkey
Look at the displacement I think the ISL is 8.9L and the big ISX is 15.2L, I could be wrong but those are the numbers off the top of my head. I can say that I have torn both engines down to the blocks and reassembled them and if I had a choice I would get an ISX but my wallet and wants are two different things. Both are good engines.
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Our ISX is 15.0L according to some info and 14.9L on others, I just tried to find the displacement of the new ISX's and haven't found it yet.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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05-04-2016, 07:37 AM
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#14
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Senior Member
Newmar Owners Club Freightliner Owners Club Spartan Chassis
Join Date: Apr 2012
Location: ON THE ROAD...SOMEWHERE
Posts: 6,973
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One thing not mentioned is the ratio of HP and Torque to expected total weight (MH & toad). How much does this play into the equation? I suppose the potential difference in total weight doesn't make between the two coaches isn't so significant to negate the advantage of the ISX but it might be worth double checking. It could also be instructive to compare the previous underpowered coach's HP & Torque to total weight ratios to your options to make a full evaluation of your options.
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2006 2015 DSDP 4320 4369, FL Chassis, 2013 CR-V 2020 Jeep Overland, Blue Ox Avail, SMI AF1.
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