(10-13-2016 )RPM1 Wrote:  oops for got to do the reply thing , but my comment was to u hammerhead :)

(10-14-2016 )Hammerhead Wrote:  

(10-13-2016 )RPM1 Wrote:  oops for got to do the reply thing , but my comment was to u hammerhead :)

It's my understanding with the one pice monotherm piston witch r all steel they went to less clearance piston cylinder , I highly dough your hearing skirt slap possibly some form of pre or even late detonating as the whole engine is cold and takes few mns to warm up combustion chamber for a better burn ,all though I would think the ecm would comfinsate for that . Just a thought

The sound I am hearing that I wait to ease before idling up to 900 is piston skirt slap. If it was cam chatter, it would take longer than a minute or so to go away, and would never really go away. The sounds is crisper in my ISX than my friends BCIII with aluminum pistons, but it's the same sound.
It almost sounds like pre-detonation. I have had concerns of a possible leaking injector causing it, but they passed the leak test last time I checked them. That was about 5 months ago, so it's about time to test them again. Member 8042 wants to check his injectors as well, and we had hoped he was going to get thru town while I was home so we could check both of ours at the same time.
When I preheat the coolant by running my APU it doesn't slap.
In my drag racing days I used to use electric warming blankets on the cilynders (finless air cooled H-D motor) in the mornings to prewarm the aluminum pistons to control it.

I am by no means an expert in anything ISX, and I personally have NOT witnessed the bearing washout as described in my previous post, but I certainly trust the individual that told me about it. I haven't yet had time to do more research into the matter, just doing my part to pass along info to Brock, an active info contributing member that just did a lot of work and I would hope someone would do, and has done the same for me...

(10-14-2016 )Running rough Wrote:  Cm570 and 870 isx's will have a 'cold knock' on a cold start in cooler temps if not plugged in or apu not running, not sure on 871's, cm2250 have a lot smoother starting when cold, due to commen rail injection I would assume

(10-15-2016 )Brock Wrote:  Well I'll be damned.... I've never seen this before! I didn't think it was possible with the weight I haul and the idle time I have but here it is, a few thousand km and still looks pretty good!



Still need to get my amsoil filter on, ran out of time. Now let's see if I can keep the oil clean???