Thanks for the graph and explaining. I have a better understanding now.

 

look at my other post. broke my rod bolts and snapped a h beam. I guess there is a reason they tell you to upgrade to age625's for 600hp+

 

arent they 3/8" arp 2000's? i would get together with these guys. thats not right.

http://forums.nasioc.com/forums/show....php?t=2263681

 

no, the 625's are the upgraded set.

 

i realize that, but when is the last time you heard of a turbo tuff rod breaking a bolt or a beam? something is wrong as the turbo tuffs use a plain arp 2000 bolt without trouble.

 

I do have another question...Can the rod bolts with the complete engine still in the car, or is it recommended to break it down.

 

you mean can the rod bolts be replaced with the engine in the car? yes, you just need to drop the oil pan.

 

Yes. lol. I'm sorry. I'm an idiot. Thank you

 

i did find it strange that the h beam+ recommend age625 for 800whp but then the arp2000 that are used to the normal h beam 600whp are ok on the i beams at 1000whp? i mean they don't even list i beam+ with 625, i'm sure it's an option but not listed like the h+ are.

 

i dont understand that either. with the price of h beams + the 625+ you can get the turbo tuffs. no brainer for me.

 

why is it the rod bolts on the turbo tuffs don't break being arp2000 tho and with the h beam they do?? the i beam should put more stress on the bolts being heavier even..

 

how much are the upgraded bolts?

 

around $100. But why didnt you upgraded when you guys build the engine?

When we build mine we did all the bolts and all in the head . It was a no brainer . I am also running the Manley H beams, with Cp pistons.

Rob

 

Sorry guys, have to say it. Rod bolt failures are very uncommon. The number 1 reason for breaking rod bolts are over revving the car making the bolts stretch. Like racing and going from 3rd to 2nd! Rod bolts don't really break do to hp/tq either. The H beam will snap before the rod bolts. It really drives me crazy when people talk about changing rod bolts. It is not needed... If you have a cheap h beam motor that you are revving to 9+k rpms then ya change the rod bolts but if you are revving to 8k you will be just fine.

Rods also should never be rated by hp, only tq. Your H beams are rated to 550tq tops but I would keep it around 500-525tq. Aaron at English Racing is running an H beam just like the Manley and he makes 800+whp. He just keeps the tq down low enough to keep the rod in the block. Same concept with stock rod motors. We can make 600whp on the stock evo block if we keep tq below 400tq. Everything is relative to cylinder pressure/tq number.

Mikey

 

If I would've knew, I would've done it back then instead of spending the money on the bolts now and the labor. No brainer!!!
I wasn't even into cars when the motor blew. I just knew it was cheaper to build it than to buy another stock engine.