thy rod no longer comforts me - Printable Version
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thy rod no longer comforts me - flash - 08-01-2012
as promised, here are some shots of the rods that bent when i hit 7psi boost. please realize that the reading of amount of boost on a gauge is only a reading of what the engine could not take in. a more efficient engine will make more power, but show less boost than a less efficient one. so, if you have a crap motor, it will show higher boost numbers than a better engine, but not make any more power. this is how many manage to run higher boost numbers. they really aren't making as much boost as they think.
notice that where the rods bent is NOT where porsche reinforced them. these are the 1R rods. the 2R rods are reinforced down where the connecting nuts are, and not up at the top where these bent. it does not matter which of the OEM rods you have. they will all bend when you exceed their load limits. this is a designed in failure component. most engine designers choose the rods as the give item. it's generally less damaging and less expensive to repair than other things, like the crank or block.
the first shot shows all 4. the only straight rod is the one on the left. not entirely certain it is straight either.
here is a shot of one of the pistons. note the wear from scraping the side of the bore. they were all pretty much the same. this is what happens when a rod bends like this.
thy rod no longer comforts me - KRAG50 - 08-01-2012
Interesting!
thy rod no longer comforts me - flash - 08-01-2012
lol - yeah - i had some other, more interesting and colorful words to describe it, but decorum prevents me from sharing
thy rod no longer comforts me - tamathumper - 08-01-2012
Ouch!
thy rod no longer comforts me - Lear35A - 08-01-2012
Bent is not good, of course. But they didn't fail, which is a positive thing. In a fresh motor what is the boost expected from the DS1 SC?
thy rod no longer comforts me - DaveN - 08-01-2012
I'm guessing that my pistons look like that as well. At least you have your cylinder walls still!
thy rod no longer comforts me - flash - 08-01-2012
uh - no - i had to bore them out and put in oversized pistons. that was a whole new adventure too.
thy rod no longer comforts me - Langley968 - 08-06-2012
Interesting read
The title chosen was a very skillful "play on words"...
thy rod no longer comforts me - flash - 08-06-2012
lol - i never said they were good jokes. i only said they were plentiful.
thy rod no longer comforts me - Eric_Oz_S2 - 08-11-2012
Were you running over the normal factory rev limit at times on the dyno?
Are the 951 forged rods a fix in your opinion, rather than going after market?
thy rod no longer comforts me - flash - 08-11-2012
no on revs.
i know some people feel the 951 rods are an option. i have also heard they need a modification in order to work. the problem i have with that idea is twofold. first, modifying a highly stressed part is always dicey. second, why not run a stronger and lighter rod if you are changing? the cost difference is negligible if you are already replacing them. balancing will still be required. makes no sense to me to use something less than what i can have, with no performance advantage to it.