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that isn't correct. higher ratio rockers simulates higher lift but doesn't change duration or lobe separation. a 'hot cam' has changes in all these areas, which makes an engine's idle characteristics change. in these two engines, the changes in injector and IP are the only things that can...

to the administrators: since this post is being moderated, it was suggested that i send complaints about a moderator upward. so how can i do that when the moderator i would like to make a complaint about has lowered my PM box count to the point that i cannot send PMs?

i'm just questioning where the air is coming from. i know that diesels (and this MF does operate off of the diesel principle) make power by increasing fuel and stay alive by increasing air. but the turbos have already been stated to be found interchangable from the LDT to LDS - and not that...

ok, read the 'Principles of Operation' as described in TM-9-2815-204-35. that helps explain the combustion process and what the swirl is supposed to be doing. but back to the main thread topic.... ?

awesome, thanks. so, besides the 'ramp' that induces swirl in the bowl, they don't look any different than the 'BT or 'CT Cummins pistons. obviously the Cummins have a cone or rise in the middle of the bowl - i theorize this is there to force the in-rushing air/fuel into the sides of the...

examples: pic 1 - photo of my 5.9 before rebuild pic 2 - 6bt piston pic 3 - 24v ISB piston pic 4 - 6CT piston pic 5 - Cummins family; 6CT: back row, far right, 6BT: front row far left, 6BT marine: front row far right what do the MF pistons look like?

:ditto: the un-welcome-ness and intolerence of 'in-step perception' is getting much worse around here. accelerating, actually. i still don't understand the differences in piston design between the MF and (for example) small Cummins.

it isn't scary, it's nice. you'll have to trust me on that one. [thumbzup]

honestly, i'm not familiar with a direct injection diesel that doesn't have a 'cup' or 'bowl' in the piston for combustion to occur. i know the B and C series Cummins do. the current and previous 3 generations of powerstrokes do. can't speak for d-max's, but i think they do also. i think...

piston coolers will not affect EGTs. they may, however, allow a higher sustained combustion temperature (that we observe from EGT readings). meaning: the LDS is running more fuel. more fuel = more power. higher rocker arm ratio allows for more intake air to enter the combustion chamber...

good point on the CR - i was trying to recall (without going back through all 90 posts) whether the rotating assembly was the same. if the crank and rods are the same part #'s and the piston pin heights are the same between the two motors, then CR should be the same unless there are...

don't worry - we all know you are a mod. thanks for keeping the thread correct and adding value.

well, i am interested in what the differences are. my question was not directed to you. and if you never intended to answer the 'what is different' question, why did you feel like you needed to answer it anyway?

thanks - that helps.

alright, so tell me if this is what we are saying: the only difference between the LDS and LDT motors are - injectors injection pump settings pistons (only for ring count purposes) otherwise, essentially everything else that may make a difference is the same - turbo (swappable and...

i believe this is consitent with everything that i've learned and read about modifying diesel performance. what i've learned is that fuel rate is a very simple measurement that estimates and defines power ratings but is not necessarily a defining characteristic of power delivery. changing...

unless you have the equipment to pop-test injectors and measure orifices down to 0.001", you may not be able to tell any difference between LDT and LDS injectors. you'll need a fuel bench set up to measure the differences in injector pumps. increased number of piston rings means increased...

there are more rings on the LDS pistons. injectors are different as well as injection pump. plus the turbo, as you mentioned. so, with these 4 things being different, well, that's a completely different fueling potential. are the HGs the same? i thought those were different, also...?