deion82

I'm listing to see if anyone has ever seen this. I have a roots blown 408 stoker. I've had some issues with the dyno and recently they had the blower belt to tight and took out the #1 main bearing. During disassembly found the # 2 main cap to be broke in two pieces and very heat stressed. Any thoughts?

KCS

iTrader: (20)

Seen that on blower cars several times, but not to the point it breaks the main cap. That's impressive.

What do the bearings look like?

deion82

Junk. Haha The bearings are gone. They look like a thrust bearing as the metal rolled up along the crank journal.

RezinTexas

wow. got any pictures of this? I noticed the bearing tang was gone...

was the block line-honed with the studs?

TheWolfMatt

2000PewterT/A

Seen plenty of bearings taken out but this is the first time I have ever seen a main cap snapped in half like that.

Blackbob

iTrader: (1)

You sir are talented ! What did your oil pressure look like ?

deion82

Block was line honed with the studs. Oil pressure was about 35 psi idle and around 65 psi under load. Bearings look like the one that is still in the rod in the picture. In all reality I thought they looked fairly good for the damage. On the dyno they tightened the blower belt way to tight. On that pull we noticed sparks by the crank hub. They noticed some wear marks on the hub with the timing marks. They re marked the timing line made another pull and aborted because of sparks and then made a decision to see what's going on. Do you think the blower belt took out #1 main bearing and then on the second pull it snapped the #2 main cap??

deion82

I just noticed that also. I will take a look I think it may have bust the tang off the block? I'll get pictures of the bearing also.

ss performance

iTrader: (17)

I would be surprised if just tightening the blower belt could do all that damage.

I would suspect some serious detination

deion82

So possibly from when they had to much timing from the get go and melted the head gasket and head?

deion82

Here's a picture of the bearing.

deion82

Another

deion82

Here's a picture of the crank mag. Lots of stress cracks.

deion82

Another

deion82

Intake

deion82

Top of intake

deion82

FTI cam, lifters, pushrods, with stock rockers and roller bearing mod.

deion82

Efi injector plate. 16-66 lb injectors when it was efi. Haha