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

mike tkach 12-09-2014 09:34 AM


Originally Posted by Black Baja (Post 4232115)
H-beam will twist under detonation as the piston moves from tdc as an I-beam will not due to the I-beam design.

i have never heard of a rod twisting due to detonation,where did you get this information.i am asking because i am always wanting to learn.

mike tkach 12-09-2014 09:37 AM


Originally Posted by Black Baja (Post 4232203)
I didn't know there was mountains in Illinois. Do you consider yourself a "mountain billy"?

thats some funny chit right their!

Black Baja 12-09-2014 09:51 AM


Originally Posted by FIXX (Post 4232184)
we run bme rods in the mountain motors..2000 plus hp range...i have to admit that i do run 5w20 syn in one of my toys and its been living at 10600 rpm range since 2005..

I have to ask... How many AA's does your toy take. That thing has gotta take a lot if it's spinning 10,600 rpm's. No really who's heads are on that thing that will support that many rpm.

Cole2534 12-09-2014 02:32 PM


Originally Posted by Black Baja (Post 4232115)
H-beam will twist under detonation as the piston moves from tdc as an I-beam will not due to the I-beam design.

Are you going to substantiate this claim? I don't see how a rod with its symmetrical shape would ever impart a twisting motion in tension or compression.

Black Baja 12-09-2014 02:53 PM


Originally Posted by Cole2534 (Post 4232316)
Are you going to substantiate this claim? I don't see how a rod with its symmetrical shape would ever impart a twisting motion in tension or compression.

When you detonate the piss out of the motor the piston will want to rotate in the bore. The I-beam design is alot stronger as far as twisting goes. I think I still have some pics in my old phone of a set of rods that came out of a nitrous motor with a bad tune up. This is not a big mystery to nitrous builders.

Full Force 12-09-2014 03:10 PM

I never heard of twisting myself, not to say it cannot happen, but never once heard that...

brian41 12-09-2014 03:18 PM


Originally Posted by Full Force (Post 4232338)
I never heard of twisting myself, not to say it cannot happen, but never once heard that...

A little before your time.......look up Chubby Checker.

Full Force 12-09-2014 03:20 PM


Originally Posted by brian41 (Post 4232344)
a little before your time.......look up chubby checker.

lol

Cole2534 12-09-2014 03:34 PM

Cool. I'd like to see pics of those twisted rods.

jamie 10017 12-09-2014 04:03 PM

Just my 2 cents butt most of the time when a Rod fails.... something else has happened first (spun bearing) oiling issue "something" its not to often they just break , not saying they can't or won't break but rarely.... I was IHRA Record Holder in 84 and 85 in A-Gas 468 bbc with tin-dipped chevy rods 8600 rpms never a problem. I know thats different from boat engines but as others have said.... tune up.. Clearences when built etc etc will blow one up quickly.


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