Matching balanced pieces

Reply Subscribe

Thread Tools

Search this Thread

Oct 12, 2004 | 02:20 AM

ROCNDAV

Thread Starter

TECH Junkie

iTrader: (100)

Joined: Mar 2004

Posts: 3,725

Likes: 2

From: Pasadena, CA

Matching balanced pieces

Well, my hand is starting to feel a little bit better, so I started torquing the mains and stretching the rod bolts so I can measure bearing clearances on my Lunati 395 stroker kit. Man, that Crank is just beautiful! I've got the mains all right around .0018" and the rod bearings all have .003".

Both sets of bearings are King Bearing High Performance Alecular bearings.
Mains: MB5013HP
Rod: CR 848HP STD (LB-663)

I know it is necessary, but the kit's tolerances are so repeatable that it was almost not worth purchasing all the tools, I should have just went with plastigauge

The kit was internally balanced at Lunati and I am wondering how important it is to match up rods with pistons, weight wise that is.

I have the following:

Rods (R1~R8) Recipricating weight (grams) / Rotating weight / Total Weight:

R1 180 / 446 / 626
R2 179 / 446 / 625
R3 180 / 444 / 624
R4 179 / 445 / 624
R5 180 / 444 / 624
R6 177 / 443 / 620
R7 178 / 442 / 620
R8 179 / 447 / 626

Pistons:

P1 395.3
P2 395.7
P3 395.3
P4 395.3
P5 395.2
P6 395.2
P7 395.2
P8 395.2

I also have some info from the balance sheet if it helps:

Internal Balance: Bob Weight 1708 gms
Step 1: Cwts work,
Add 2 - 1" / 7/8 Front
Add 1 - 1" / 1 - 3/4 / 1 - 1/2 Rear

Step 2
Post: 75 deg @ 07gms
Flange: 08 deg @ 20 gms
(Drill to finish)

Step 3 & Finished Balance
Post:__deg@01gms
Flange: __deg@00gms

So how important is it to match up the rods and pistons based on weight?

Thanks,
David