Engine Balance PICS...

[Pagz]

Hi all...received the Flywheel,crank,rods and crank pully back from the balancer today...the results where interesting...

The Crank was good...with only a small portion removed from the counter weights...

http://memimage.cardomain.net/member_images/3/web/735000-735999/735658_221_full.jpg
http://memimage.cardomain.net/member_images/3/web/735000-735999/735658_218_full.jpg

The flywheel and crank pully were also ok with only small portions removed from the pressure plate and flywheel outer...

http://memimage.cardomain.net/member_images/3/web/735000-735999/735658_222_full.jpg
http://memimage.cardomain.net/member_images/3/web/735000-735999/735658_223_full.jpg
http://memimage.cardomain.net/member_images/3/web/735000-735999/735658_219_full.jpg

Not so great for the rods...waaay off!!!...and apparently not uncommen for OEM parts...notice material taken from the lower end of the rod as well as the top,this is to balance both ends,as rods dont just travel up and down...(for those who didnt know;))

http://memimage.cardomain.net/member_images/3/web/735000-735999/735658_220_full.jpg


After much debate,we have decided not to have the rods shot-peened...
1.because we are not increasing RPM,thus the most dangerous inertial tensile loads will not be more the stock.
2.Increased air/fuel volume and increased cylinder pressures should not cause sufficiant stress on the crank or rods.
3.the rods could require machining after the shoot peening, because it can cause rods to warp under the high stress...

the new pistons and big end bolts will be weight checked before assembly also!...they should be here after i get back from OZ...seeyall in a few weeks...

[rollinrealbig]

thats cool! now your making me want to rip my M111 apart for the hell of it! LoL

[Proven Guilty]

i'm getting more and more jealous by the day!

[Ashkan's C280]

kudos, nice pics mang

[Pagz]

Thanks mang should be alittle smoother now for sure!

[alphanumeric]

sorry if you already posted this. but why did you decide to go with custom pistons? whats wrong with stock

[Pagz]

Originally posted by alphanumeric
sorry if you already posted this. but why did you decide to go with custom pistons? whats wrong with stock

hey,good question...
why i went with new pistons:
-The engine was apart,its so much cheaper to do it now rather than later.
-it was decided the cast pistons softer ring lands would not take detonation at high boost well if we ran into it...and if we do i hope the head gasket doesnt take it instead!.
-the forged items should be lighter,which is all good.

who could resist ceramic/moly coats,contact reduction grooves,accumulator grooves,heavy duty light wieght wrist pins and gapless rings....

I have no doubt the stock items would have worked...but for how long and with how much abuse?!?!?...it costs way to much to find out!...
again we could argue the strength of the rods and crank...hopfully i will not find that any time soon.

Paul

[Ashkan's C280]

how much boost are you planning on running? Also any plans for more suspension mods? Great project mang...

[c280nz]

all looking good and coming along nicely brother :cool:
have a good holiday in aussie! hopefully itl be alot warmer than here :( im jelous

[SLAMMED_C]

Lookin good Paul.. looks like everything turned out well with being balanced.
is it me or is that last rod not machined on the lower portion of the rod end?.. it was it was lighter then the rest and didnt need to be balanced?
any more news on the pistons yet?.. still waiting for them Im guessing.

[Pagz]

Originally posted by c280nz
all looking good and coming along nicely brother :cool:
have a good holiday in aussie! hopefully itl be alot warmer than here :( im jelous

thanks man,its wicked over here...water/air 23-24 degrees...blue skys pure white sands and way to many hot chix damn....

[Pagz]

Originally posted by SLAMMED_C
Lookin good Paul.. looks like everything turned out well with being balanced.
is it me or is that last rod not machined on the lower portion of the rod end?.. it was it was lighter then the rest and didnt need to be balanced?
any more news on the pistons yet?.. still waiting for them Im guessing.

Thanks Ross,yip the last one was originally the lightest,so didnt require machining on the small end!...will hopfully get more picks up when i get back around the end of the month!...laters;)

[OzC36]

After much debate,we have decided not to have the rods shot-peened...

Gutsy decision - Good luck and let us know how long your engine lasts!

[alphanumeric]

It'll last.. have you checked out the Volvo forums and what those guys do to their engines? yeah 300-500HP on stock internals?

this guy has a 740 Volvo. 2.3 stock engine block with oil squirters, 8.7 comp, stock 16valve head swap, actually I dunno what the comp ratio is after the 16valve head swap.. anyways he is putting down 300rwhp and like 350lbs tq with Megasquirt.. oh yeah he is only running 15lbs of boost too!

the only problem now is hooking up to the ground.. as it only ran a mid 13 sec 1\4

and from what I understand MB and Volvo internals are made the same way.. and the M111 has oil squirters too? shoot dawg!

[OzC36]

I think you misunderstand my comment. I love what 23K is doing and the quality of work performed.

However, my concern is that the removal of material from the connecting rods has left a smooth and shiny surface which will create a stress path for the loads encountered in service. That means that significant loads will be carried in the outer layer of the reworked area instead of more uniformally throughout the entire depth of the material of the rod. If I understand the process correctly, this could mean that these normal loads could then induce premature failure. Stress relief is normally performed with a shot peening process

23K and his advisors have considered this possibility carefully as he detailed above and decided that this would not be a problem. However, I being a cautious chap, might have taken the path of buying replacement rods that were matched in weight or carry out the shot-peening process.

[Pagz]

Originally posted by OzC36
I think you misunderstand my comment. I love what 23K is doing and the quality of work performed.

However, my concern is that the removal of material from the connecting rods has left a smooth and shiny surface which will create a stress path for the loads encountered in service. That means that significant loads will be carried in the outer layer of the reworked area instead of more uniformally throughout the entire depth of the material of the rod. If I understand the process correctly, this could mean that these normal loads could then induce premature failure. Stress relief is normally performed with a shot peening process

23K and his advisors have considered this possibility carefully as he detailed above and decided that this would not be a problem. However, I being a cautious chap, might have taken the path of buying replacement rods that were matched in weight or carry out the shot-peening process.

well explained man!...and the debate is still going about weather or not we shot peen them even after what i thought was a final decission,for the reason we removed material causing uneven stress,and even maybe i should have just gone with custom units...its a hard one....and it depends on how far we really want to go with the engine...will talk more when i get back,damn net time is expensive at resorts...

Paul