kb car goes down !

back_in_black

New Member

Apr 12, 2003

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frederick, MD

May 13, 2005

#1

• May 13, 2005

• #1

went to a local track for my first run with my 1.7 kb with 10 lb pulley.......1.83 60 ft., 109.9 mph, 12.39 1/4 mile time, smoke started pouring out the exhaust near the end of the run, motor shut down. started motor and I hear a knock, probly, piston rod, time for forged bottom and 14 lb's boost. I am pretty happy with my 1/4 mile time, not to bad for an auto vert !

 

streetstang03

unModerator

Dec 27, 2003

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the dark side of the moon/home of the 1999, 2003,

May 13, 2005

#2

• May 13, 2005

• #2

at least you get a better motor and the opportunity to up the boost

 

back_in_black

New Member

Apr 12, 2003

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frederick, MD

May 13, 2005

#3

• May 13, 2005

• #3

yea, I was all ready to go to Ocean City MD next weekend for the hot rod weekend, looks like I'll be driving something else !

 

RNstanger

New Member

May 30, 2004

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May 13, 2005

#4

• May 13, 2005

• #4

How much power were you putting out with the 10lb pulley?

 

back_in_black

New Member

Apr 12, 2003

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frederick, MD

May 13, 2005

#5

• May 13, 2005

• #5

it was 397 rwhp through the auto

 

sgarlic

Founding Member

Apr 21, 2001

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May 13, 2005

#6

• May 13, 2005

• #6

Were you shifting past the redline or something? I can't believe you blew it up on your first pass. That's nuts.

 

mrvax

Stay thirsty my friends

Founding Member

Nov 29, 1999

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SN Moderator: Orlando, Fl.

May 13, 2005

#7

• May 13, 2005

• #7

sgarlic said:

Were you shifting past the redline or something? I can't believe you blew it up on your first pass. That's nuts.

Click to expand...

Not necessarily. Once you get to near 400rwhp, and through the auto, he's pushing about 496 bhp you are asking for trouble. The rods are the weakest link.


Good luck with the forged bottom end! When I grow up, I want to get blown with a forged bottom also!

 

Evenflow

yellow snow cone lover

Nov 4, 2004

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Mass

May 13, 2005

#8

• May 13, 2005

• #8

mrvax said:

Not necessarily. Once you get to near 400rwhp, and through the auto, he's pushing about 496 bhp you are asking for trouble. The rods are the weakest link.


Good luck with the forged bottom end! When I grow up, I want to get blown with a forged bottom also!

Click to expand...

Why wait till you grow up I can blow you right now

 

back_in_black

New Member

Apr 12, 2003

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frederick, MD

May 13, 2005

#9

• May 13, 2005

• #9

my son filmed the run and you can see a little smoke through the exhaust at the higher rpms in each shift, is this the rings failing under boost ? before this run i had noticed I was also starting to burn a little oil, and had read about mac lt's causing oil blow by, maybe it was signs of rod failure ?

 

hotmustang331

Active Member

Apr 29, 2004

2,967

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Bastrop,TX

May 13, 2005

#10

• May 13, 2005

• #10

Man, thats sad...but KBs seem to have a pretty high failure rate on the stock bottom end. Forge it and crank up the boost LOL, may get 480 RWHP.

 

Gearbanger 101

Straight Outta Locash

20+ Year Stangneter

Aug 10, 2002

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Ontario, Canada

May 13, 2005

#11

• May 13, 2005

• #11

Ahhh one of the mighty KB cars finally bites it when saddled with too much airflow. Maybe this will convince the naysayers that forged internals in a blown car are more of a necessity than they’d like to admit. I’m sure this will be only one of many casualties that occur considering the majority of users that have gotten greedy with the boost.

On a side note, sorry about your car dude , but a built short block will ensure it never happens again.

 

Gearbanger 101

Straight Outta Locash

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Aug 10, 2002

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May 13, 2005

#12

• May 13, 2005

• #12

mrvax said:

The rods are the weakest link.

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I disagree. Although the rods do in fact suck, it's the pistons that suck even worse. The problem is that theirs not enough meat around the top ring landing to shield them against even the slightest hint of detonation. The problem being after that, is that once it goes, it tends to take the rod with it.

 

snGTstang

New Member

Jul 19, 2004

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maryland

May 13, 2005

#13

• May 13, 2005

• #13

that sucks man, im gonna be at ocean city next weekend too. i always like seeing s/c'd mustangs running around.

 

02LaserRed2V

New Member

Jul 30, 2004

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Augusta, GA

May 13, 2005

#14

• May 13, 2005

• #14

Most say 400rwhp is the limit for a stock block.

However, 400rwhp 5-speed and 380rwhp auto = about the same bhp

Many fail to mention that.

Good luck getting everything fixed!

 

mrvax

Stay thirsty my friends

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Nov 29, 1999

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May 13, 2005

#15

• May 13, 2005

• #15

Evenflow said:

Why wait till you grow up I can blow you right now

Click to expand...

Damn homos!

 

mrvax

Stay thirsty my friends

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Nov 29, 1999

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May 13, 2005

#16

• May 13, 2005

• #16

Gearbanger 101 said:

I disagree. Although the rods do in fact suck, it's the pistons that suck even worse. The problem is that theirs not enough meat around the top ring landing to shield them against even the slightest hint of detonation. The problem being after that, is that once it goes, it tends to take the rod with it.

Click to expand...

You may be correct. I was basing my opinion on several years of carefully monitoring what blew up on what kind of set-up. I can't tell what 1st happened, only what the end result was.