Offshoreonly.com - Favorite BBC Rod Thread

Offshoreonly.com (https://www.offshoreonly.com/forums/)

- General Q & A (https://www.offshoreonly.com/forums/general-q-20/)

- - Favorite BBC Rod Thread (https://www.offshoreonly.com/forums/general-q/320770-favorite-bbc-rod-thread.html)

Quote:

Originally Posted by mike tkach (Post 4232785)

i don,t think he means bent because he stated that detonation causes the piston to TWIST.back in my racing days i met a lot of nitrous guys who would push it past the limit.serious detonation can ruin an engine in less than a second.one time a guy took the head off and it and what was left of the piston looked like someone was in there with a torch but no TWISTED rod.

Thats what I mean, I seen things detonate to nothing and the rod was fine.... ANYTHING is possible though, just because we didn't see it don't mean it can't happen right? HAHA

Quote:

Originally Posted by Full Force (Post 4232580)

Amazes me... I am not re-using any of it in my new builds, all new even blocks...cranks were even hitting bottom of pistons!!! how do you not feel or see that when ASSEMBLING?

But I didnt twist a rod!!! LOL

[ATTACH=CONFIG]534062[/ATTACH][ATTACH=CONFIG]534063[/ATTACH]

That was surely a "rookie build" if those were 6.385 rods, trying to figure how the counter weight, scrubbed the piston. What is the compression height of the piston ? 540 CID build; correct ? Using a 6.385 counter weighted crank, with a 6.135 rod and trying to have a taller C.H. on piston, to bring piston up to -.025 D.H.

142985 547 4.530 4.250 6.385 9.780 1.270
part # CID Bore Stroke Rod Deck C.H.

Whats the measurement from center of crank to O.D of counter weight ?

Quote:

Originally Posted by MER Performance (Post 4232822)

Honestly I still have no clue what this guy did...what I have found out so far (hence starting with all new parts and none of this used again)

1-crank is 4.375 stroke
2-rods are 6.385 never measured them but the paperwork said they were that Dave gave me.
3-pistons say for 540 kit
the pistons were at least .020 out of the hole, blocks 4.5030

I have no clue how you can build the rotating assembly and have it hit piston skirts, how the hell did he rotate it?

this is the guy, look at his garage if this works, thats enough to tell me bad news... I have no idea why my buddy went to him...

https://www.facebook.com/profile.php...774194&fref=ts

Quote:

Originally Posted by MER Performance (Post 4232831)

142985 547 4.530 4.250 6.385 9.780 1.270
part # CID Bore Stroke Rod Deck C.H.

Whats the measurement from center of crank to O.D of counter weight ?

I am not sure..

.[ATTACH=CONFIG]534094[/ATTACH]

Quote:

Originally Posted by Knot 4 Me (Post 4232733)

You'd think it would just bust the wrist pin out of the skirt as opposed to twisting the rod. This is the only way I've seen them "twisted". Pics would be cool!

That's not bent or twisted. It's slightly curved.

But it looks so easy to build a motor on Powerblock tv!

Quote:

Originally Posted by Black Baja (Post 4232857)

That's not bent or twisted. It's slightly curved.

Lol! Curved road ahead! :flag:

Quote:

Originally Posted by Full Force (Post 4232837)

Running a 4.375 stroke, 6.385 rod CH of 1.270 would take you .042 out of the hole. If you had a .050 thick gasket the piston would rock and hit. Someone machined pistons down, either a custom piston would be needed or use a 6.535 rod with custom piston having a 1.077 C.H. I'm pretty sure the ring stack would work being its a NA build. I have no idea how you, can swing that piston and rod length around that counter weight unless, you machined down counter weights.
Not the best combination for a 4.375 crank in a 9.800 deck block

Quote:

Originally Posted by Black Baja (Post 4232857)

That's not bent or twisted. It's slightly curved.

That's what happens when you get old right SB . :picard1: http://www.offshoreonly.com/forums/a...d-bent-rod.jpg