NX Dragster new pistons

Look, trying to compare two different engine builds and timing changes doesn't work, unless the build are the same. Since we already know they are different the rest of it really does not matter. As for Top Fuel pins they were designed to give rather than break so in there case it works but the diesel piston rod assemble is much heavier than the top fuel one so time will tell if it's going to fail too fast in this application. Also a thing to note is that a top fuel application uses a piston assemble for about 10 runs then tosses them out so they are not expected to live for a long life!
 
If a diesel is making 1000 hp at 5252 , then you only have 1000 ft lbs of torque, whether it’s a diesel or a gas engine.
At 4500 rpm’s , the stall of the converter I will be using , that same diesel engine is making 1168 ft lbs of torque . .
This is no where near the double you state ., at the 5700 rpm shift point , the torque will be 921 ft lbs of torque .,
The pistons and pins in the NX mustang are a similar design and are lasting quite well , making great power and running to 6000 RPMs at will. This car is driven on the street , and get quite a lot of street miles , where Mike makes long cross country drives with the car.
 
I dont care what TQ the Diesel makes at higher RPM. The point is the PEAK TQ seen. The rods will have to deal with the PEAK load. Your shift points and MAX RPM are not the load we are talking about here. Rather the load the rods see at the highest TQ number.

The lower the PEAK TQ on the RPM scale, the more pressure one has.
 
I never run the engine at Peak torque so who cares , torque is not improtant , its hp that make a drag racer run fast , will never see the motor loaded below the convertors stall .

are you just totally oblivious of any kind of race related math .
 
COMP461 said:
I never run the engine at Peak torque so who cares , torque is not improtant , its hp that make a drag racer run fast , will never see the motor loaded below the convertors stall .

are you just totally oblivious of any kind of race related math .
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Well, what is the "torque peak" you'll be running at? it's not necessary the peak it can possibly make.

That's what trying to be understood as I see it.
 
COMP461 said:
The pistons and pins in the NX mustang are a similar design and are lasting quite well , making great power and running to 6000 RPMs at will. This car is driven on the street , and get quite a lot of street miles , where Mike makes long cross country drives with the car.
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I won't debate what the car has done (kudos to you all), but it's a far cry from 1000 hp.

Even stock pistons will last at 650 rwhp, for a while. So IMHO until the 'Stang runs for 100 passes or whatever, it's a bit of a stretch to say they're "lasting quite well".

"Lasting" in my mind is a whole season of heavy racing.

Or correct me if I'm wrong.
 
nwpadmax said:
I won't debate what the car has done (kudos to you all), but it's a far cry from 1000 hp.

Even stock pistons will last at 650 rwhp, for a while. So IMHO until the 'Stang runs for 100 passes or whatever, it's a bit of a stretch to say they're "lasting quite well".

"Lasting" in my mind is a whole season of heavy racing.

Or correct me if I'm wrong.
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its showing the track about 880 hp 3680 lbs and 147.88 mph , and this was on little street tires and a easy tune. JohnBoy will tell you that with just a little more tire , or tune the car would run 8's . this motor in a legal Pro Street ride would run low 9's to high 8's and drive it to the races and drive it to the motel every night.
 
This is all great BS as anyone trying to compare a part that it's only purpose in life is to last for about 3 minutes total use, is not going to be for the average diesel owner. There is a real good reason the Top Fuel people ALL toss the pistons, pins and rods in the trash after 10 passes event when they still look good. Most of the time they do not make it that long! The Top Alcoholic racers run them about 25 passes then they go in the trash.

If Greg plans to rebuild this motor just as a top fuel car does it might work. The base material chosen for a top fuel application isn't something I would event worry about in a street driven diesel application. What Greg has to worry about is that his application is much heavier (internal engine) than a Top Fuel application so it just may jump up and bite him in the a$$ if he tries to run them time and time again.

As for the Mustang it has not done one thing better than it did last year with a set of stock cut pistons in it! Those are the facts as the car runs the same times as before and until it does much better than before this is just more wishful thinking. So if your going to change the tires and the car setup it had better be a whole bunch quicker and faster than it was before otherwise it's just more of the same.
 
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COMP461 said:
I never run the engine at Peak torque so who cares , torque is not improtant , its hp that make a drag racer run fast , will never see the motor loaded below the convertors stall .

are you just totally oblivious of any kind of race related math .
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DO WHAT?????


if theres no tq how do we get Hp???????
 
Diesel Tech said:
This is all great BS as anyone trying to compare a part that it's only purpose in life is to last for about 3 minutes total use, is not going to be for the average diesel owner. There is a real good reason the Top Fuel people ALL toss the pistons, pins and rods in the trash after 10 passes event when they still look good. Most of the time they do not make it that long! The Top Alcoholic racers run them about 25 passes then they go in the trash.

If Greg plans to rebuild this motor just as a top fuel car does it might work. The base material chosen for a top fuel application isn't something I would event worry about in a street driven diesel application. What Greg has to worry about is that his application is much heavier (internal engine) than a Top Fuel application so it just may jump up and bite him in the a$$ if he tries to run them time and time again.

As for the Mustang it has not done one thing better than it did last year with a set of stock cut pistons in it! Those are the facts as the car runs the same times as before and until it does much better than before this is just more wishful thinking. So if your going to change the tires and the car setup it had better be a whole bunch quicker and faster than it was before otherwise it's just more of the same.
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the bob weight of a top fuel engine is just a little more then this piston and rod, Same piston, same wrist pin, and same rod.
 
Joesixpack said:
Isn't top fuel CR around 6.5.
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its a little higher then that , but it also depends on which hole its in , they put different compression pistons in each one

the boost is around 45 to 60 psi with 100 to 150 GPM pumps .

the unlimited diesel sled pullers have run aluminum rods for years ,
 
COMP461 said:
its showing the track about 880 hp 3680 lbs and 147.88 mph , and this was on little street tires and a easy tune. JohnBoy will tell you that with just a little more tire , or tune the car would run 8's . this motor in a legal Pro Street ride would run low 9's to high 8's and drive it to the races and drive it to the motel every night.
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OK, I didn't know you made 880 with it. Is that from the dyno or estimated from the MPH?
 
COMP461 said:
thought I would show a few pictures of the piston and rod combo before Tommy stuffed then in the motor.



4.125 bore
Piston 780 grams
Pins 300 grams 1.156 .300 wall tool steel . DLC coated
total bob weight 800 lighter then stock
16.75 to one
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COMP461 said:
the bob weight of a top fuel engine is just a little more then this piston and rod, Same piston, same wrist pin, and same rod.
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The piston weight you listed above is much higher than a Top Fuel piston. So if the wrist pin is the same and the rod is the same how does the diesel come out lighter?
 
Forrest Nearing said:
well obviously... I think he means that drag racing isn't about making torque, it's about making horsepower...
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IF it wasnt about TQ then how does a 500hp diesel have a faster ET then a 500HP gasser in the same vehcil????????

when was the last time you saw a 500hp gas ~7000lb truck runn low 13s high 12s? usually they are 15seconds...
 
are we talking about gas vs. diesel here? :confused:

or are we talking about getting a diesel down the track as quick as possible? :confused:
 
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