Matt Sheppard

I'm on Pet 5

Danno: 7K . . .man, I'm not even at 700

Yes, someone w/ cast rods, please post a pic. That's my problem - every engine I tear into has forged rods. . . kinda sucks.

Also, did the '83's have cross drilled rod journals on the cranks? Mine does, which was a pleasant surprise. If not, my "opinion" of this bottom end might be wrong. I think they still used the stock rods even if the crank was worked and bearings redone.

User 41221

"Rumor" has it that there is a PET 6, April 2003 floating around now. I am guessing that it just updates newer models tho, and doesn't have any effect on us "older model" guys.

Back to th eforged rod thread, tho... aside from saving a little bit of weight, why do folks throw away perfectly good factory forged rods in favor of Pauter/Carillo? I am getting set to rebuild an engine and am wondering if I should upgrade or not.

Regards,

Danno

The Pauter rods are lighter than stock and the Carrillo are much, much stronger. Haven't heard of anyone actually being able to bend a stock rod. The primary stress on a rod is actually from its own weight due to RPMs, the forces from combustion and power is small compared to RPMs. The only rods I've known to have failed on the 951s have been due to rod-bearing problems. Which spins the bearing and destroys the crank-journal and the rod.

Perry 951

Matt, Scott.. I am on PET 5 as well, but I know there are version updates as well. Like PET 5.1, 5.51, 5.55551, etc. Pet 5 has been around since the mid 90's if I recall, and I am sure they would need to update it now and then.

2+2

I have seen broken rods in a 951 engine...however, it was a misbuild where 944NA rods were used in a 951!!

joonas

I got 944.103.101.3RARST rods out of 83 944 N/A. Rod bearings were made 1982 so I think they are original.
And crank was cross drilled also.

Darwantae951

Holy crap, this thread is almost 7 years old...

V2Rocket

i just got a set of those for a song...will be going into my backup engine

Voith

Its a pretty long shot being this post is 7 years old, but still.. pics please

kobayashi

Funny I was just searching on this stuff a couple days ago.

If I were to rebuild an '86 NA motor, should I use the forged rods from my '83 NA? What will be the biggest difference?

AScholtes

The rotational mass of the engine rotating assembly will be heavier (and therefore, harder to spin). Not the ideal component for a NA rebuild. If you plan on unnaturally aspirating the car in the future it would be a good upgrade, but not necessary for a strictly NA car and will cost you some horsepower.

KuHL 951

Holy Archives Batman. Yes, forged rods can be bent but they usually just grenade. This 86 951 motor actually still ran....for about 30 seconds

Voith

How did that happen? Too much boost or sip of water?

KuHL 951

Neither one...oil starvation on a fast turn, #2 RB failure at 5K rpm, and it scored #3 bore really bad for some reason.

Voith

Ouch.