Competiton Engine Build Pics

[lenahan05]

I've got enough parts here in the barn to put a good engine together so i thought i'd post up a few pics as i go. heres a few just to start.

Parts: (more pictures as I go)

-Fresh Std bore 14mm main block
-Set of balanced 286110 Pistons w/coated skirts & modified pins
-Set of Peened & Balanced Rods w/ L-19 ARP bolts
-Set of cummins main & rod bearings.
-Balanced std 5.9 crankshaft

Pics are of rotating assembly.
One picture is new 110 piston weight compared to a stock 12v auto piston.

[jakerc69]

cool stuff, i love shiny parts.

[kleann]

Looks good man, bump!

[cumminsman315]

What oz in did you balance the crank to?

[lenahan05]

Originally Posted by cumminsman315

What oz in did you balance the crank to?

am i reading this wrong? i guess i dont understand the question.

[DISTURBED]

I'm guessing he means front to back difference. So I'm going to say 0oz. A lot of the cranks I spun were only a couple grams different front to back. Like 3 grams in the front and 5 in the back

[lenahan05]

i didnt balance it myself. i couldnt say for sure but i can find out. not sure why he needs to know that. it was internally balanced im sure so its hard to say. his question in grams would have made more sense to me. who uses ounces on a crank balancer?

[DISTURBED]

Nobody that I know of uses oz

[lenahan05]

exactly why i didnt understand the question. OZ never registered in my head. and the fact it wasnt worded right. very similar to my posts.

[Knoberman]

Where were the pistons coated?

[lenahan05]

the company I buy them from sells them coated or uncoated. same as mahle.

[cumminsman315]

I was meaning the out of balance it's at, not necesarily front to back

The balancer itself measures out of balance in oz per inch of radius or if it's adjustable it's oz per the length you choose, just everyone converts to grams because the material added or removed is measured in grams

But you answered my question, I guess in my very tired state of reading yesterday I assumed you balanced yourself lol, and I don't really need to know I was just curious

[98puller]

im ready to see more!!

[DISTURBED]

Originally Posted by cumminsman315

I was meaning the out of balance it's at, not necesarily front to back

The balancer itself measures out of balance in oz per inch of radius or if it's adjustable it's oz per the length you choose, just everyone converts to grams because the material added or removed is measured in grams

But you answered my question, I guess in my very tired state of reading yesterday I assumed you balanced yourself lol, and I don't really need to know I was just curious

The cranks I have personally spun were only a couple grams out. One I spun was 0 in the front and 3 in the back. The worst was the one I posted above. 3 an 5. I don't waste the time to balance the cranks since they are that close to true and for the fact that these engines don't turn that hard. If it was a 10k rpm engine I would worry. Balancing companies rip a lot of people of balancing cranks like these. Remember a medium size paper clip weighs 1 gram. So those cranks are only at most 5 paper clips out. Of the ones I have spun. Now rods are a completely different issue. They can be way different.

[lenahan05]

Originally Posted by DISTURBED

The cranks I have personally spun were only a couple grams out. One I spun was 0 in the front and 3 in the back. The worst was the one I posted above. 3 an 5. I don't waste the time to balance the cranks since they are that close to true and for the fact that these engines don't turn that hard. If it was a 10k rpm engine I would worry. Balancing companies rip a lot of people of balancing cranks like these. Remember a medium size paper clip weighs 1 gram. So those cranks are only at most 5 paper clips out. Of the ones I have spun. Now rods are a completely different issue. They can be way different.

thats what i tell a lot of guys. why waste ur money. but they insist. so i

[cumminsman315]

Originally Posted by DISTURBED

The cranks I have personally spun were only a couple grams out. One I spun was 0 in the front and 3 in the back. The worst was the one I posted above. 3 an 5. I don't waste the time to balance the cranks since they are that close to true and for the fact that these engines don't turn that hard. If it was a 10k rpm engine I would worry. Balancing companies rip a lot of people of balancing cranks like these. Remember a medium size paper clip weighs 1 gram. So those cranks are only at most 5 paper clips out. Of the ones I have spun. Now rods are a completely different issue. They can be way different.

Well If you have been balancing them down that far then you are balancing them for 10k. 7 grams is good for 10k

[DISTURBED]

I didn't actually remove any material. Those numbers are from the factory. That's how close they are right out of a stock engine.

[YOUNG GUNS15]

weird... Ive been around a few machinists that say cummins cranks are the worst for balance from the factory.

[lenahan05]

Originally Posted by YOUNG GUNS15

weird... Ive been around a few machinists that say cummins cranks are the worst for balance from the factory.

next time you take one to get balanced see how much they taken off when you pick it up. i bet its nearly nothing. your getting ripped off most likely. ive never seen or heard of anything like that.....sounds like you need a new machineist or balancer. one of the two.

[YOUNG GUNS15]

Originally Posted by lenahan05

next time you take one to get balanced see how much they taken off when you pick it up. i bet its nearly nothing. your getting ripped off most likely. ive never seen or heard of anything like that.....sounds like you need a new machineist or balancer. one of the two.

Its just hearsay really. The 12 valve crank we had done locally did have quite a bit removed. The guy said it was one of the worst he's ever done. SO who knows really. Its water under the bridge and the engine runs smooth as can be.