Technical #4 Cylinder is dead…any ideas as to what caused the failure?

[SLOWESTN54]

Lmao ! It is an auto !!!

it takes a lotta IQ to be able to shift a auto

 

[SlowE93]

it takes a lotta IQ to be able to shift a auto

 

[IQraceworks]

I agree with @carabuser on his assesment regarding tune.
While many newbies got familiar with Ken because of MHD, prior to that MANY complaimed about his tunes.
As time passes, people gain experience, but quite a few people were unhappy with tunes back then.
So "highly regarded" to one, may be quite the opposite for another.

Ken didn't make that tune.

 

[SlowE93]

it takes a lotta IQ to be able to shift a auto

Wait, is this why you have a manual ?

Sorry, had to

 

[SlowE93]

Back to topic. I still agree w @carabuser ...
Could have been an injector issue for sure.

 

[SLOWESTN54]

Wait, is this why you have a manual ?

Sorry, had to

535 was a auto, X6M is a Auto . But oddly when i pull the paddle it shifts every time.

 

[IQraceworks]

Back to topic. I still agree w @carabuser ...
Could have been an injector issue for sure.

I'm hoping I will be able to tell more once I get the motor apart. Who knows, maybe it's as simple as a cracked ring? (keeping fingers crossed).

As far as forged pistons and rods...what are some good options? Manley rods and JE pistons? I'm assuming a forged piston isn't going to be as fragile as the cast ones if there is a some little hiccup (like an injector acting up for a split second).

 

[martymil]

I'm assuming the only way to make the motor "reliable" with the power it's currently making is to go with forged pistons and rods?

Once you get them the next thing is the block, at the minimum get a closed deck and sleeved the cylinders or turn it down to 20 psi or less. I cracked my sleeves at 21 psi at a track session.

 

[SlowE93]

535 was a auto, X6M is a Auto . But oddly when i pull the paddle it shifts every time.

Omfg, its supposed to do that

 

[IQraceworks]

Once you get them the next thing is the block, at the minimum get a closed deck and sleeved the cylinders or turn it down to 20 psi or less. I cracked my sleeves at 21 psi at a track session.

Closed deck for 25psi and 600hp? Isn't that overkill?

 

[martymil]

Nope, these block are weak.

 

[SLOWESTN54]

Nope, these block are weak.

who makes sleeves? And where do I buy them from

 

[SlowE93]

who makes sleeves? And where do I buy them from

Drop in some pipe and send it !!!
Wasting money on sleeves is like wasting money on injectors !

 

[martymil]

who makes sleeves? And where do I buy them from

Vac motorsports would be my pick for both.

 

[RNM]

Did you have any other symptoms like a lot of smoke?

 

[IQraceworks]

Did you have any other symptoms like a lot of smoke?

I noticed that if I got on the gas hard, and then let off...I would get a little puff of smoke out the exhaust. I'm guessing that was oil getting sucked up past the rings. Other than that it still ran pretty great (idle from a slightly wobbly idle you could feel).

 

[martymil]

Typical symptom of a crack ring land is a half miss at idle, it sounds like a miss but its regular and non stop.

 

[SLOWESTN54]

Typical symptom of a crack ring land is a half miss at idle, it sounds like a miss but its regular and non stop.

Tons of oil out the oil cap too

 

[IQraceworks]

Typical symptom of a crack ring land is a half miss at idle, it sounds like a miss but its regular and non stop.

Bingo...that's exactly what I had. I had a bunch of vapor (blowby) coming out of the oil cap, but no oil.

As far as forged pistons go....are people still having issues with them triggering the knock sensors because of the loser clearances?

What about just pulling the head off, the oil pan off, and pulling the damaged piston/rod out the top and dropping a new oem piston back in there (assuming the bore isn't damaged).

 

[martymil]

If one is damaged others are possibly not far behind.

Yes you get a little false knock but that can be tuned out these days.