Poor engine...

• Oct 7, 2013

• #1

mattman347

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Well as some know my 97 bent a rod a week ago when I was up in Ohio. Can't complain one bit as it has 215k on it and 12K of that was over 600hp. It happened while I was getting on it hard, when I let out of it it has a strange knock. Lol. It has been giving my signs of letting go for a while now with a lot of blow by out if the passenger valve cover vent. Number 8 was the one to finally bend, piston is 3/8 shorter than the others! New 7.3 going in, but it's only a forged rod again. My plan is to run this for a while while my billet rod engine is getting built. I hope it lasts, but I don't have high expectations! LOL!
New engine

Cracked piston

Short rod at TDC

 

• Oct 7, 2013

• #2

mattman347

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Redneck engine stand!!!

 

• Oct 7, 2013

• #3

4.0l sahara

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Lasted pretty long. How many times had you actually sprayed that thing out of curiosity?

 

• Oct 7, 2013

• #4

PABowhunter

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Good luck with the new engine. How much over 600 did you dyno with that setup?

 

• Oct 7, 2013

• #5

Dieselboy.

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Little bit of valve contact on the piston it looks like.

Im worried mine could let loose anytime

 

• Oct 7, 2013

• #6

mattman347

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4.0l sahara said:

Lasted pretty long. How many times had you actually sprayed that thing out of curiosity?

Click to expand...

I would say at least 50-75 times in the 1/8th, maybe more.

 

• Oct 7, 2013

• #7

mattman347

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PABowhunter said:

Good luck with the new engine. How much over 600 did you dyno with that setup?

Click to expand...

Did just over 700 with spray, track times put it close to that, I ran a 7.43@ 7000#'s.

 

• Oct 7, 2013

• #8

mattman347

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Dieselboy. said:

Little bit of valve contact on the piston it looks like.

Im worried mine could let loose anytime

Click to expand...

Yeah and that was not there before when I blew the gaskets with stage 2's and this 468. I shimmed my 910's but it apparently was not enough... It's all a big gamble at this power level, I'm just going to try to break in my new engine a little before I go crazy, but Rudy's event is this weekend and I as thinking about towing my superduty out there with the OBS to break it in good!! Lol

 

• Oct 8, 2013

• #9

obspsd

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Hope You Have Better Luck Than I Do! See You At Rudys

 

• Oct 8, 2013

• #10

Black 02

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So if a person was going to run a similar combo, they should use more than a set of shimmed 910's?

 

• Oct 8, 2013

• #11

mattman347

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Not too sure, only one or two made contact. I might have not had them set quite right in the first place.

 

• Oct 8, 2013

• #12

Magnum PD

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Beehive springs or hypermax springs.

 

• Oct 10, 2013

• #13

Milford

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HMax springs are super nice, but that price? Kinda high for a forged rod motor setup! IMO

 

• Oct 11, 2013

• #14

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Southmike

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Bigger shims.. I believe junkie shimmed his a little more and had luck with that.

 

• Oct 11, 2013

• #15

Groomzybanshee

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Southmike said:

Bigger shims.. I believe junkie shimmed his a little more and had luck with that.

Click to expand...

I wouldn't say that's the answer...

I had comp springs un shimmed for about 35 pulls and 40k.. Broke several times and rev'd to 5k or so and didn't have valve marks on a piston.

 

• Oct 11, 2013

• #16

mattman347

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Yeah, the answer may just be I did not get that ONE single one set right, all he others are OK.

 

• Oct 11, 2013

• #17

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Southmike

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Have you rolled the push rods on something like a sheet of glass?
Least the one with the valve that made contact.

 

• Oct 11, 2013

• #18

Derek@Vision Diesel

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Black 02 said:

So if a person was going to run a similar combo, they should use more than a set of shimmed 910's?

Click to expand...

That sir depends on a lot of other things. Most will answer yes to this question, if you look at the numbers coil bind is an issue and seat pressure is nothing exciting compared to stock.
Lots go with 910s because they can get by and they are cheap. I love the beehive springs from Comp, but they are surely more expensive.

You get what you pay for!

Just for the record I ran 910s in my 7.3 at this horsepower and would probably do it again....

 

• Oct 11, 2013

• #19

Viking

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Thats a nice engine stand right thur!

 

• Oct 12, 2013

• #20

Milford

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Yeah it is! On a side question here, what are the dimensions and product used for the stand? I need to make on and building one out of tube like yours seems to be the best way to go.