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#21
01-21-2009, 05:11 PM
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Thanks Mark |
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#22
01-21-2009, 08:49 PM
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I found out it's too stinkin' cold to go out to the garage yet. Or maybe I am too lazy this year!  I am not racing next year, so there is no rush...If I were, my new motor would already be done. I hope to get it torn down within the next month. I expect I may see some fretting on the #2 cap...maybe not.
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Darin '64 Bonneville Wagon (sold) 69 Lemans-All motor (sold) 9.81 @ 136.39MPH |
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#23
01-23-2009, 10:58 PM
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Quote:
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Badder than old King Kong And meaner than a junkyard dog -Jim Croce |
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#24
01-24-2009, 09:36 AM
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Good information. The "weak" link here when going to 3" mains is the construction of the crankshaft. We've seen enough cast steel Eagle cranks fail to avoid them in 3" or 3.25" mains. One of our customers in particular, broke one in 4 peices at 730hp, and another one in two peices about a year later. He finally went to forgings, no more troubles. One of the cast steel cranks was raced for two seasons, nearly every weekend, in the high 9's/low 10's, then, without warning it gave up, windowed the block and oiled down the entire top end of the track. About a year later, the back-up engine did the same thing.
The 3" main cast steel cranks have their limitations, as we've seen them in 500hp engines last for many years without problems. FWIW, with the forgings currently available, I wouldn't even look at a cast crank at any power level. As far as rpm potential, I don't see the larger main 3.25" journals as a big trouble area here. If you are building from scratch, you should be looking at 3" main blocks. Easier to obtain, and plenty of good cranks readily available in just about any stroke you would want to set them up with.....Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
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#25
01-24-2009, 10:44 AM
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Cross drilling is not necessarily a good thing. Most crankshafts from Moldex are not cross-drilled. The best cranks in my opinion are center drilled cranks like the race 303 Pontiac crank was. Ford's best cranks are center drilled presently.
Tom Vaught
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#26
01-24-2009, 12:09 PM
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That's good info Cliff & Tom ....Thanks
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#27
01-25-2009, 03:30 AM
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Tom V- I haven't seen "center drilled" cranks. Can you please post a sketch or picture?
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) ... or has a Pontiac born the same year as Jim Wangers? (1926} 
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#28
01-25-2009, 07:30 PM
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#29
01-26-2009, 03:53 PM
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I think this is a centre oil crank. Maybe Tom could chime it.
Last edited by Polar-Pontiac; 04-09-2010 at 06:48 PM. |
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#30
01-26-2009, 09:52 PM
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535 here with AP/Scat Ultra Light 4.5 forged crank, BME Alum 396 series 6.7 rods, BRC Custom Pistons, At first i will probably leave it under 6500 But After a while I'll Probably put in a Big Roller and Springs then stick it to the wood to see what 8000+rpm Sounds Like! YeeHaw!
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D.S.R.E. Your NW Pontiac Street/Strip Engine Builder, Specializing in Cylinder Head,Intake Manifold,and Exhaust Manifold Porting services and Building the Most Efficient stock rebuilds to Hi HP Pump Gas and Race Combinations for Pontiac,Buicks,Olds,FE Fords,385 Series and HP Gen 3 and 4 LS engines! 2006 silvy Z71 4X4,383 LS 600+hp NA Shared Toy-66 Lemans 470cid by me 537hp 580tq-manifolds, 570hp 590tq-2"headers,custom cam,rpm intake, mild e-heads, Looks stock ;-} |
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#31
01-26-2009, 10:21 PM
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#32
01-26-2009, 10:34 PM
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LOL Yes I do!!!
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D.S.R.E. Your NW Pontiac Street/Strip Engine Builder, Specializing in Cylinder Head,Intake Manifold,and Exhaust Manifold Porting services and Building the Most Efficient stock rebuilds to Hi HP Pump Gas and Race Combinations for Pontiac,Buicks,Olds,FE Fords,385 Series and HP Gen 3 and 4 LS engines! 2006 silvy Z71 4X4,383 LS 600+hp NA Shared Toy-66 Lemans 470cid by me 537hp 580tq-manifolds, 570hp 590tq-2"headers,custom cam,rpm intake, mild e-heads, Looks stock ;-} |
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#33
01-29-2009, 11:08 AM
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Well. Wifes new motor will see 8400.
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Greg Merrick |
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#34
02-19-2009, 02:14 PM
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Since I just discovered that my (former) machine shop misinformed me when it told me my 1973 455 block had to go .040 over, and now it turns out I must go .060 over, but I already have .040 over pistons (that I ordered after relying upon my -former- machine shop, groan) . . . . Can a 400 block go to a 455 .040 over?
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Badder than old King Kong And meaner than a junkyard dog -Jim Croce |
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#35
02-19-2009, 02:35 PM
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4.19" ??? I guess that is .070 over, so I will have to go find another 455 block or get new pistons. Oh, well. It was an idea.
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Badder than old King Kong And meaner than a junkyard dog -Jim Croce |
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