Rod Bolts Little Known Fact

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ogsp5

225 whp @ 8psi

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2002 p5 (MSP Powered)

• Jan 24, 2009

• #1

Did you know that the standard rod blot on the F.S engine elongates under acceleration. And even worse when boost is applied. This is one of the main reasons our engines go. Mack from Emerald Performance who has done my engine install, has spoken to some of the best engine builders in Aust.(nailbyt) They have re built many blown engines with this fault.
This was what happened to my engine, you could loosen the bolts on the #2 and 3 rod. So if anyone who is running their original block, you are driving on borrowed time. So by the time you hear it. It's too late.(attn)
I would suggest to take the time pull the lower part of your engine and check your rod bolts. And if you can up grade to ARP and new bearings.

 

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slo03.5msp

Member

:

03.5 yellow msp

• Jan 24, 2009

• #2

This would have been helpful about 3 months ago when my engine was out!

 

L

low_psi

Member

Contributor

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ms|slowtege #399

• Jan 24, 2009

• #3

The rods are also very very weak by design. The bolts may stretch, but the rod itself remains the biggest problem.

Does ARP make a suitable replacement?

 

F

ForceFed

Member

:

Trailblazer SS AWD ....Still a Mazda Junkie Though.

• Jan 24, 2009

• #4

Yes...ARP does.
They come with your new Forged Rods.


(In other words.....No need to swap out bolts unless you are going to do the rods)

 

L

low_psi

Member

Contributor

:

ms|slowtege #399

• Jan 24, 2009

• #5

That's my point, its a waste of money to put ARP bolts into OEM rods.

 

O

ogsp5

225 whp @ 8psi

:

2002 p5 (MSP Powered)

• Jan 25, 2009

• #6

low_psi said:

That's my point, its a waste of money to put ARP bolts into OEM rods.

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That is so true, but in these economic hard times this might be a fix. It would be cheaper to do so, get a proper tune and drive till you can do a complete forged engine.
But the question still is still around, did the loose bolts cause the rod to slap the block and bend or pot a hole in the block ?

 

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DubbyDoo

Member

• Jan 25, 2009

• #7

you can get k1 rods for 375$ engine would be good to about 300 hp at that due to the pistons i believe

 

F

ForceFed

Member

:

Trailblazer SS AWD ....Still a Mazda Junkie Though.

• Jan 25, 2009

• #8

ogsp5 said:

That is so true, but in these economic hard times this might be a fix. It would be cheaper to do so, get a proper tune and drive till you can do a complete forged engine.
But the question still is still around, did the loose bolts cause the rod to slap the block and bend or pot a hole in the block ?

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Simple answer is no.
It would trash a bearing First...and Unless it COmes apart...I doubt it would..or could , hit the block with the bolts still in place.

 

O

ogsp5

225 whp @ 8psi

:

2002 p5 (MSP Powered)

• Jan 25, 2009

• #9

Point taken. It was just a thought.

 

F

ForceFed

Member

:

Trailblazer SS AWD ....Still a Mazda Junkie Though.

• Jan 25, 2009

• #10

ogsp5 said:

Point taken. It was just a thought.

Click to expand...

Its ok....But trashing a bearing could lead to it locking up, bending a rod to the point it breaks and sending it through the block.

But just being loose wont allow it to hit the block....SO it would all still come down to bearing failure.