Subject	Billet Crower VG crankshaft!
Posted by	LitlElvis on September 01, 2014 at 7:46 PM
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Message	The first two pics here show the different oil drilling from the main journal to the rod journal. The stock VG crankshaft is crossdrilled on both the main and the rod journals with a "T" intersection drilled on center to connect the two together. This may seem superior but it isn't when it comes to higher RPMs... with a stock drilling, the oil must overcome centripetal force to flow into the "T" drilling and on to the rod journal, this force increases exponentially as RPM increases (see graph below). The Crower drilling is known as "Chevy style" or "high-speed oiling" and is drilled as close to the being tangential to the main journal as possible and the pressure required to initiate flow to the rod journal is substantially reduced from stock (don't let anyone tell you they can modify a stock crank for high-speed oiling, plugging one side of a cross-drilling is nowhere near the same). Crower oil drilling Stock oil drilling Oil pressure required to overcome centripetal force at RPM back stock, front Crower Crower 5/32 radius. Rod journals are widened to allow radius to be tangential to bearing surface (to increase overlap/strength) and corresponding rods must be wider as well for proper thrust clearance. Stock radius is undercut to achieve a large radius without impinging upon bearing width, the problem is this reduces cross-sectional overlap between journals and is a weak spot.
Follow Ups	Billet Crower VG crankshaft! - LitlElvis 19:46:13 09/01/14 Wow! Thanks for sharing those photos - ttsmokin 23:09:10 09/01/14 Out of curiosity, what's the weight difference between the 2 (n/m) - PiotrC70 00:21:51 09/02/14 Re: Out of curiosity, what's the weight difference between the 2 - MikeC(NZ) 02:00:55 09/02/14 I got roughly 41 lbs stock vs. 43 lbs Crower (n/m) - LitlElvis 06:32:59 09/02/14 So it sounds like drilling mods are not worthwhile? (n/m) - ZXoltan 09:19:02 09/02/14 (n/m) - ztunerz 09:20:43 09/02/14 I can't imagine what benefit could come from plugging... - LitlElvis 09:15:26 09/03/14 so what's the price tag on one of these? (n/m) - shiers69 09:51:46 09/02/14 This falls into the "if you have to ask..." category (n/m) - Turbodog (CT) 11:12:02 09/02/14 as long as we're making dumb comments... - shiers69 11:25:24 09/02/14 tables made of OEM cranks are so blasé (n/m) - shiers69 11:26:27 09/02/14 No insult intended - Turbodog (CT) 11:54:58 09/02/14 A very valid point of consideration - shiers69 12:16:40 09/02/14 I kind of agree - -Grimm- 13:11:41 09/02/14 I can't afford to purchase a Ferrari - ZXRider 13:24:19 09/02/14 tru dat - shiers69 14:00:26 09/02/14 If I could guess - -Grimm- 14:18:41 09/02/14 We all did a group buy on ours and saved a few hundred bucks - JDAVE 14:46:22 09/02/14 Didn't want you think I was ignoring you.. prices are below - LitlElvis 21:18:08 09/02/14 Is that chart from EES? - TheMarlin (MidTN) 11:52:47 09/02/14 I did the calcs for the chart... not sure what/who EES is. (n/m) - LitlElvis 21:13:03 09/02/14 How much does this crank cost? (n/m) - ZXRider 13:22:35 09/02/14 $3300 for one, $3000 for a GB of three - LitlElvis 21:07:22 09/02/14 Hey Brett, is that graph for the crower crank or the oem? (n/m) - scottmt21 21:02:19 09/02/14 The graph is for the stock crank... actually it applies - LitlElvis 21:09:54 09/02/14 something you're not considering is that the centripetal - aliaZ 06:35:54 09/03/14 Maybe I misstated... the calcs are the pressure required - LitlElvis 09:01:57 09/03/14 a column of oil requires no more pressure than a drop of oil - aliaZ 09:07:57 09/03/14 What about the larger column of oil in the throw to the rod? - BlackholeZ 12:37:46 09/03/14 you're right to some extent - aliaZ 12:49:42 09/03/14 EP Racing has been doing a similar crank mod. - toykoz32 00:04:56 09/03/14 EPR has been converting stock cranks to billet? - LitlElvis 08:10:32 09/03/14 That cant be a serious question - toykoz32 10:27:08 09/03/14 Cant*** (n/m) - toykoz32 15:31:15 09/03/14 Nice piece! Can you tell me what the difference - Ash's Z 13:06:13 09/03/14 Ash, can you please return my e-mail or phone call? (n/m) - Ashman2k2 15:43:57 09/03/14 Re: Nice piece! Can you tell me what the difference - aliaZ 16:39:58 09/03/14 This question is the crux to the debate that rarely gets - LitlElvis 18:19:49 09/04/14 here is an interesting read on crankshaft oiling - aliaZ 11:21:58 09/06/14
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