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Low Compression Street Engine's & Tuning Techniques Idea's...How Too's on low compression Engines.

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Old 04-25-16, 02:59AM   #1
TA63
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Default eagle forged crank quality?

How is the quality of the eagle forged cranks?
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Old 04-25-16, 11:33AM   #2
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Decent. Haven't had any issues as long as the end user doesn't abuse the engine and follows the rules.
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Old 04-26-16, 12:24AM   #3
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If you were building a 3.75 stroke engine to make 450-500 hp on the motor with the possibility of a 150 hp nitrous shot down the road would you trust one, or should I be looking somewhere else?
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Old 04-26-16, 04:03AM   #4
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Go for it. But make sure all your other upgrades match the 650hp projected HP.
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Old 05-24-16, 10:34PM   #5
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Eagle offers a 3.75" stroke? Not in my current catalog.

For the power numbers you state, a stock 400 "N" (nodular) crank will do fine.

Eagle "stroker" cast cranks are safe to well beyond 600 HP. The forgings are rated at 1,500.

Unlike the Chevy, the crank is the STRONG "link" and the block is the limiter.

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Old 06-03-16, 03:11AM   #6
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Smallest stroke SCAT shows is 4.0" stroke & that's a 4340 forged piece with 326/400 mains & BBC2.20 rod journal diameter.

That would get to 428" with a 400 block if you can get stock length rods w/BBC big end?
looks like Scat sells a stock length H beam rod but only in the 2.249 Pontiac big end size.
Eagle same deal.

That effectively throws a person wanting to build a stock stroke Pontiac smaller than 428" with an aftermarket forged crank out of that market.
As far as I can tell there currently is no NHRA approved aftermarket Pontiac stock stroke 3.75 ,4" or 4.121 cast or forged crankshaft.
Great marketing.
If your not into building a stroker & having to by the BBC rods,stroker pistons and all the other yadda that goes with that you are basically locked out from Eagle & Scat cranks.

Ohio Crankshaft does offer a 3.75" stroke Pontiac 4340 forged crank that uses 326/400 std.3.0" mains & 2.249 rod journal size.Life should be so easy.
http://www.ohiocrank.com/pont_cranks.html

This note from Ohio Crank:
5/20/16 - Cast Cranks Less and Less - High Performance cast and nodular cranks are becoming less available as more forged shafts become available.
Ohio Crankshaft still stocks some popular ones but will not be replacing the inventory. This will also apply to 5140 steel shafts as 4340 is better at only a slightly higher cost.
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