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Old 04-10-2005, 06:29 AM
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eagle crank hp rating.

how much hp do yall think an eagle nodular crank,sir rods, and hyp. pistons can take. it is a sb 400 .030 . i know the sir rods say 500 hp at 7000 rpm, but we have the rev limiter set at 5800 so i think we will be ok at 540 hp.with them.the unit has been balanced. the reason i am asking is because im trying to sell the 400 and the cam i have for it will only yeild about 470 hp. but the boy that wants to buy it wants to put all roller in it. the roller cam im looking into yealds around 540 hp at 5200 rpms.i hate to build it for him and it come from together in short order.what do yall think?

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Old 04-10-2005, 07:40 AM
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I cant see it being a problem. RPM is much more of a problem for parts than power output.

Chris
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Old 04-10-2005, 07:41 AM
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weak link

Basically your looking for the weak link. If the SIR rods are cast. That would be your weak link. If they rods are forged your pistons will be the weakest link.
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Old 04-10-2005, 02:06 PM
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It has been my experience that these manufacturers rate thier parts conservatively. As has been stated the rpm rating is more of a concern than the horsepower rating. Though there is room to move in both areas. I have typically seen the eagle cranks and rods rated at 500hp live a long life in a properly built 600 hp engine. Its like any part if its abused on a constant basis you run the risk of an early demise. But in a street/strip engine they will live a long life. Bottom line you combo will work fine for that horsepower level the crank and rods wont even notice the extra 40 HP .

Doc
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Old 04-10-2005, 04:38 PM
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thanks guys. im selling out,these gas prices are to out of control for my liking.im gona sell everthing and use it for a nice down payment on a motorcycle,48 mpg vs 5 mpg (if you cant beat em, join em). but part of the deal to sell the motor he wanted me to build it to, so i said ok. but he wanted a little more hp out of it and i didnt know if it would take it.i was building it to go in a 4 x4 and thats what i bought the parts to do, he has a street cruiser that has a 383 in it now and had a lot of problems with the keith black pistons. he had me to listen to a noise in it the other day and it sounded to me like a wrist pin on # 6.he said thats the same hole the piston come apart in about a year ago.i just didnt want to build him another head ache. if ya know what i mean.
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