[Shotimes] Rod Bearing Change @190K miles

[Donald Mallinson]

Exactly Jim, that is why I have been trying to point out that true 
lugging is down around 500 rpm!  True lugging that does damage is way 
down where the engine is just about to die.  YOu can feel every power 
stroke (or it feels like you can) and you have a decent amount of 
throttle applied.  1/3 or more throttle!

I have never seen an unmodified properly working automatic that will 
allow big throttle openings in a high gear at low speeds. Just never 
seen it possible to apply that much throttle without a kick down.  the 
SHO ATX will normally kick down, and even if you run it in 2nd gear 
where it stays in 2nd, the torque converter won't lock up at low speeds 
with lots of throttle applied. 

So if you don't have all these conditions it isn't lugging:
super low rpm (500 or so)
High gear
big throttle positions
and Low speed.

It ain't lugging.  and it isn't going to happen in an ATX

Don Mallinson

Jim & Debbie Leyden wrote:

>I think part of the problem here is the lack of a good definition of
>"lugging".  When I was in the military and going through Machinery
>Technician Class A school they defined lugging as a condition where
>application of more throttle will not increase engine speed.
>There seems to be some confusion about the SHO motor as to what a safe RPM
>is to run at on the lower end of the scale.  Some people are claiming that
>running the motor at less that 2000 RPM is lugging it.  I dispute that
>premise based on the factory owners manual and the fact that when the car
>was built the national speed limit was 55 MPH.  In a SHO MTX 55 MPH in 5th
>gear is less than 2000 RPM.  This tells me that it is perfectly acceptable
>to run a SHO motor at less than 2000 RPM.  I believe that the ATX cars will
>run as low as 1500 RPM before forcing a downshift under light throttle
>conditions.
>The problem as I see it is when a driver applies excessive throttle to bring
>the RPM up from 1500 RPM to whatever speed they are looking for.  I think
>that is what is being called lugging and in truth has nothing to do with
>lugging at all.
>
>Jim
>
>
>
>
>-----Original Message-----
>From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
>On Behalf Of Donald Mallinson
>Sent: Wednesday, February 01, 2006 9:07 AM
>To: bjshov8
>Cc: shotimes@autox.team.net
>Subject: Re: [Shotimes] Rod Bearing Change @190K miles
>
>At least that guy was making about 300lb ft of torque at 1500 rpm!
>
>I sold a generation 1 Mazda RX7 to the secretary in my insurance agents 
>office.  When she took it for a test drive, she handled the clutch OK, 
>but shifted to high gear at about 25 mph and in a rotary that is 
>horrible!  I cautioned her that this engine needs rpm, and never to 
>drive around below 1500-2000 rpm.  That is pretty safe with most engines.
>
>Understand that the definition of lugging is about FIVE HUNDRED rpm!
>
>Well, I kept seeing her drive around town with the thing popping and 
>banging at 25 mph in high gear, again about 500 or so rpm at big 
>throttle openings.  I called her a couple times warning her that rotary 
>experts say she is going to ruin the engine, and sure enough within 2 
>months she calls asking me to help her get a new engine.  I did better.  
>I found an enthusiast to buy the car and he put in a used engine.  This 
>was about 15 years ago and he is still racing that car!
>
>Don Mallinson
>
>bjshov8 wrote:
>
>  
>
>>OK, I've got a story about "lugging" engines.
>>When I was working at my dad's shop back in the early 70's, we had a friend
>>who was a plumber, and had a 1968 Chevy pickup.  He special ordered a 1966
>>Impala SS for his wife, with 425hp 427 and 4-speed.  His wife didn't like
>>driving it so my dad's shop swapped the engines between his pickup and
>>Impala.  The Impala ended up with a 283 and Powerglide, the pickup ended up
>>with the 427 and 3-speed trans.  I don't know what happened to the 4-speed.
>>But back to the subject- this guy would drive that pickup around town,
>>    
>>
>never
>  
>
>>getting above 1500 rpm.  In 1st or 2nd gear, he would get to maybe 1500
>>    
>>
>rpm,
>  
>
>>then he would drop into the next gear and chug along.  I always thought
>>    
>>
>what
>  
>
>>a waste.
>>
>>
>> 
>>
>>    
>>
>>>It is NOT impossible to lug an ATX, and (unfortunately) I have talked to,
>>>and ridden with, SHO owners who do just that.
>>>   
>>>
>>>      
>>>
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>>
>>
>>.
>>    
>>
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