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Old 12-13-2012, 06:32 AM   #1 (permalink)
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Limit of stock rods?

I see a lot of people putting big money into their flywheels with good rods and balancing etc. I've never really seen a twin cam rod failure. I'm running stock low mileage '09 4-3/8" flywheels that will be welded. I'm guessing the bike will make between 120-130hp at 6500 ish. I'm curious how far people have pushed the stock rods.
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Old 12-13-2012, 08:55 AM   #2 (permalink)
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What little the chinese H beam rods cost,why chance it ?
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Old 12-13-2012, 11:17 AM   #3 (permalink)
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kinda wondering that myself.....HP is one thing, but more likely a factor of hi-comp and high RPM to let a rod out of the case
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Old 12-14-2012, 06:30 AM   #4 (permalink)
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I'm not too concerned about it. It's a pretty low budget build. I turn it to 6500 all the time as it is but its going to be a bit more power. I've never seen one break other than a buell. I was hoping there would be some more info but I guess no news is good news.
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Old 12-14-2012, 04:33 PM   #5 (permalink)
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It's piston weight coupled with RPM that pulls the stock rods apart. If you're running heavy pistons - ie. Axtell 117" kit pistons, then changing rods is insurance.

those H-beam rods are sure beefy looking compared to stock rods!
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Old 12-14-2012, 05:28 PM   #6 (permalink)
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It's going to be 113" for now. SE 11:1 pistons. I'm going to set it up closer to 12:1 with 266s and ported cvo 110s. Should make peak power around 6500. I'll probably set the rev limiter around 6800.
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'06 FXDXB: 113", 11.5:1, cvo110 heads by Dan Vance, 266e, hpi 58/62, modified thunderheader, tts, dx bars and shocks, true track, buell xb wheels, chain drive, 3.17:1. 139h/130t sae.
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Old 12-14-2012, 08:04 PM   #7 (permalink)
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Quote:
I'll probably set the rev limiter around 6800.
With that crank at 6800 rpm that would be an average piston speed of 4938.5 fpm. The ragged edge for a high dollar well built street crank assembly is 5000 fpm, and that description does not fit your stock welded crank.

I get laughed at on the Harley Tech forum for looking at piston speeds, so you can do what you want. But I would recommend you keep your rpms down to 6500 max with the stock crank.

Regards,

-Tutt
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Old 12-14-2012, 08:15 PM   #8 (permalink)
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OK TUTT .... I gotta hand it to ya my friend we finally agree on a common topic ... ... those damn little fellas are eventually gunna want to break out through the top end ... besides thats their only way out

Can you imagine getting fired on doing 4938 inside a cylinder & not wanting to disintegrate.

Cheers Tutt ....
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Old 12-14-2012, 08:33 PM   #9 (permalink)
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Well, miracles do happen Dare!

-Tutt
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Old 12-14-2012, 08:48 PM   #10 (permalink)
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Ya they do & I apologize for holding out on ya with those heads I had done up... The bonus was when they were CC'd they were dead nuts on 85 just where I wanted to be with the SE 22868-00 forged pistons but there is no way in H.ll they'll be doin' 4938 .... unless I miss a shift while runnin from an EX ..
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Old 12-14-2012, 09:04 PM   #11 (permalink)
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Quote:
Originally Posted by VDOP View Post
I see a lot of people putting big money into their flywheels with good rods and balancing etc. I've never really seen a twin cam rod failure. I'm running stock low mileage '09 4-3/8" flywheels that will be welded. I'm guessing the bike will make between 120-130hp at 6500 ish. I'm curious how far people have pushed the stock rods.
there are a lot of stock cranks/rods running that hp
that said . if your gonna pull the crank,might as well do the rods.
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Old 12-14-2012, 09:11 PM   #12 (permalink)
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Quote:
Originally Posted by strokerjlk View Post
there are a lot of stock cranks/rods running that hp
that said . if your gonna pull the crank,might as well do the rods.
No Kiddin' I cannot see any reason why anyone wouldnt renew both. Its kinda like eatin' the cone first while the ice-cream melts over your hand on a hot summer day. cause sooner or later the heat will come back to haunt ya.
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Old 12-15-2012, 06:55 AM   #13 (permalink)
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Thanks for the replies guys. The reason is the cost. From what I've seen it looks like close to a grand for rods and install? That's just not really in the budget. It was originally going to be a 4" stroke build but I got these flywheels for free. They will be welded and I'm doing a timken conversion but I'd rather not send them out somewhere and put that much into them unless it's completely necessary. I'm building it so labor isn't a concern. It's not like it's a one time deal, this isn't the only time it will be apart. I guess I already knew that I should do the rods. But I wanted opinions and experiences on how close to the edge I'm walking. I haven't heard any horror stories yet of sending two rods out the gas tank so I guess that's a good thing. We've pushed many a small block well past its limits. Guess I will see where it wants to make power and try to cap it off by 6500. Maybe next winter I'll do a 10k mile inspection tear down and throw rods in it. Maybe they will exit on their own before then, who knows.
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Old 95" wheelie
'99 Buell X1 1250
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Old 12-15-2012, 08:12 AM   #14 (permalink)
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I have seen the small ends of the tapered rods junk out twice now and end up egg shaped, for what you are describing you are without a doubt taking a big chance. What I did on one of them was to use a set of older rods and have the crank balanced accordingly, 45,000 miles on it at this point making over 120 torque with no problems
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Old 12-15-2012, 08:44 AM   #15 (permalink)
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If you were planning a 4"stroke build, how do you not have a budget for rods? 4" would require a new set of wheels anyway. I'd say its a bit of a gamble, but think about how much time it will spend at 6500. Also remember riding habits, certain behavior can aid to rod demise. Don't think you're safer with rods going out the bottom either, been there and it ain't pretty!!!
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