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Discussion Starter #1
what are the the symptoms of shorten rods?
 

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Lower compression.......Smoke at an idle.
 

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Why do you think the motor has shortened rods?

What is it doing that makes you think you have rod problems?

Any recent mods leading up to the symptoms?

Put the truck back to stock and see if the motor cranks over longer before starting than it did when it was new (easy test for possible low compression)

What are you injecting other than diesel?
a. Nitrous
b. Propane
c. Water
d. Methanol
e. all of the above

-Liquid in the motor that isn't injected in a very fine mist/spray or in gas form will give you problems.
-Too much timing from agressive programming and too much propane can give you problems.
-Too much timing from agressive programming and and too much methanol can give you problems.Edited by: mtomac
 

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Discussion Starter #4
I am only using n20 and I have a mis at idle with some white smoke all back to stock now same thing does not take long to start.
 

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I'm thinking you have an injector problem. Get the balance rates checked with a tech II or a Predator. At idle in park they should be -4mm3 to +4mm3. At idle in gear (foot on brake) they should be -6mm3 to +6mm3. The ones out of range are most likely the bad ones.Edited by: mtomac
 

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600+duramax said:
what are the the symptoms of shorten rods?
Unhappy women
 

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Yep, Check the injectors.

I am wondering what effect running high horsepower(w/ nitrous) has on injectors. Anoter motor had some way off injectors after some dyno runs with nitrous.
Can anyone explain that?
 

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hoot said:
600+duramax said:
what are the the symptoms of shorten rods?
Unhappy women

HOOT I am proud of you. You actually have sense of humor.





ON A SERIOUS NOTE? What/how do you get shortened rods? Is that the same as saying a bent conecting rod?
 

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White Duramax said:
personal experience speaking there
Whats funny about that


I got a diesel to make up for it
But then again.. don't really need it
Edited by: hoot
 

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Discussion Starter #11
I have a predator handy I will check it out keep you posted
 

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Discussion Starter #12
found the problem rod shorten.
 

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did you pull the heads?

If nitrous was the culprit I'd know it by now. My injectors balance out very well

Edited by: mtomac
 

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600+duramax said:
found the problem rod shorten.
please bring us up to speed
 

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600+duramax said:
found the problem rod shorten.

I'd be surprised if you did without having a knock of some kind. To bend the rod and still keep the pin and rod bore parallel would be virtually impossible.
 

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How do rods shorten? I mean what physically changes?Edited by: hoot
 

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I'd be interested to know how bad the cylinder got scored/gouged...
 

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F250SRW syndrome ??



Those of you that know,know what I mean .....


Mac
Edited by: Mackin
 

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Discussion Starter #20
well we have not taken the heads of just yet but one of the cylinders is down on compression the rest had about 385 and the one has 300 we think it is a rod but do not know for sure till we get it apart it still runs fine no knocking it just has a mis at idle and white smoke checked the injectors seem to be fine.If the rods are the problem I don't think the no2 is the problem I think the rods can not hold up with 750 hp.I am spraying a lot of n20 I make 528 on motor and the rest on n2o.
 
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