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#21
04-20-2007, 10:17 PM
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Not at this time. 3 1/4 mains are in the future, but we do not know when.
It was hard enough to get the 3'' mains made. We have 4.00 or 4.250 or 4.500 in stock at BOP or AP. Has anyone tap there crank to hear the high pitch ring?
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 Bob C.Quickest, Fastest, Best selling Pontiac Aftermarket Block IA II and Tiger Heads Boss Bird Funny Car Best pass to date 08/06/2016 6.027@231.64 Allpontiac Big Chief Aluminum Engine Block http://www.AllPontiac.com |
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#22
04-20-2007, 10:26 PM
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Quote:
I gave my 4.25" Eagle crank a tap with the same little hammer and it sounded way different. I assumed it was because my new AP/BOP crank was forged. Is there more to the story? My engine builder was pleased with the sound.
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James 1970 Trans Am Spotts Built 484" IA2, Highports, EFI Northwind Terminator X sequential EFI fabrication and suspension by https://www.funkhouserracecars.com/ |
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#23
04-21-2007, 12:38 AM
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What's the reasoning for the hammer tap?
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#24
04-21-2007, 02:43 AM
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DRAGNCAR, WHAT WAS CRANK WEIGHT BEFORE/AFTER?
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#25
04-21-2007, 03:23 PM
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Quote:
"What's the reasoning for the hammer tap?" It makes you feel good! 990 cranks and Moldex cranks ring like a bell. They were or are made out of great steel. I have purchased 4 of the new cranks so far and all look great and ring "true" I have listened to other makers cranks and the sound is NOT the same. More of a "thunk" which would make you think that the molecular structure is not as good. Maybe nothing to it John, but the 366 Forging would also ring "true" and we all know that those cranks have made over 2000 hp in the Rodney Butler and John Welter drag cars. I am not saying that a Scat crank will go 2000 hp (stroke makes a difference at that hp level) but they should be good for over 1000 hp which most will be at or under on power. JMO Tom V.
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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
04-21-2007, 04:06 PM
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I just took my beer cans down to be recycled and brought my crank with me to use their scale.And the verdict is in.........65.0 pounds.I never had weighed before it went through CSs Ultra Light program but they told me it takes off about 10 pounds.
Tom Vs 4" stroke crank weighed in at 75 pounds so I would think mine would be similar.But mine is a 4.25" stroke and does have the square cheeks like a factory one so it might have weighed a bit more. So for 350$ Crankshaft Spesialist will take off 10+ pounds and double knife edge it.901-452-6663 ask for Doug,you might ask Doug about what they did to Troys crank he will remember me.Nice guy,when he found out where I lived he would end conversations with "keep your head low and watch out for that Bigfoot running around out there". A light crank combined with some of Ultra Mans......I mean K Brewers lightweight I beams and some 400Cfm High Ports sounds like the ticket to a 9 second pump gas all motor Pontiac. |
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#27
04-25-2007, 01:18 PM
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Just got my 4" stroke 3" main in from AP
Mains were 2.9990 dead on, all equal. Rods were 2.1990 dead on, except the 7-8 which was 2.1985 The oil holes have a few sharp edges that need deburring but overall it looks pretty good. |
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#28
05-09-2007, 05:26 PM
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Why are 3.25 offer on the All-Pontiac web-site
Forged Crankshaft Price: $699.00 ea. Limited Quantities Part Number: APFC contact us High quality Forged Crank available in 3” and 3.25“ inch mains |
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#29
05-10-2007, 01:47 AM
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Polar, Bob,
Nunzi has bearing spacers...just a thought. http://www.nunzi-pontiac-expert.com/...e_bearings.htm Lynn |
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#30
05-10-2007, 03:56 AM
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Anybody know how much Nunzi gets for the spacers?
And I remain curious what the rear main spacer looks like- anybody ever seen it? It isn't self-evident to me how to deal with the seal. |
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#31
05-11-2007, 08:51 PM
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i too am looking into the bearing spacers. Thats a good question, how does the rear main seal work with bearing spacers? Anyone here have/had a motor with bearing spacers?
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72firebird 3800# 496 316cfm eheads, 11.1:1 compression, custom solid roller, victor 4500 intake port matched, 1050 dominator, continental converter flash 4400 stall. 3.73. 2 inch headers with 3.5 with x to mufflers reduced to 3 inch full exhaust. mallory 250 fuel pump, cal tracs with split monos ..Pump gas 91 octane. |
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#32
05-11-2007, 10:58 PM
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The seal issue would be resolved by making a two piece spacer to bring the 3.188 diameter up to 3.437. It would be wide enogh that the seal lip would miss the screws that held the two pieces together.
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Wade Congdon BOP Engineering Hi-Performance Specialty Parts for Buick, Olds, and Pontiac www.bopengineering.com |
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#33
05-12-2007, 12:42 AM
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We used to take a pair of tin snips and cut some sheet metal strips to make up the difference of a seal we found for a 3 in main before they made them for a 400. The seal we used was from a Ford and wasnt quite big enough on the OD.
I would bet that Nunzi's kit provides something or tells you what to do. I am going to buy a set, so when it comes I will let you know. Lynn |
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#34
05-12-2007, 01:53 AM
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Quote:
Speaking of required precision- do you suppose the bearing spacers, as supplied, are precise enough to just "bolt in"? Or must the spacers be bolted into the mains and then the block/spacers-assembly be line-honed? |
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#35
05-12-2007, 01:59 AM
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[quote=pontiac jack]
Speaking of required precision- do you suppose the bearing spacers, as supplied, are precise enough to just "bolt in"? /quote] Jack, arent ALL aftermarket parts precision made and ready to rock?
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  My Daddy bought me a car but all I got was this old Pontiac.
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#36
05-12-2007, 09:18 AM
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Quote:
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Systems under stress fail catastrophically |
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#37
05-12-2007, 10:11 AM
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issach428; i too am looking into the bearing spacers. Thats a good question, how does the rear main seal work with bearing spacers? Anyone here have/had a motor with bearing spacers?
Yes, i have an engine with spacers. When the crank gets turned, few crank grinders will even touch that area for rear seal. It seems like you are a dentist pulling teeth to even get them to dress that area at all. |
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#38
05-12-2007, 06:26 PM
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If a 3.25 crank was available we wouldn't need spacers,I am so pissed
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#39
05-13-2007, 01:10 AM
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#40
05-13-2007, 01:12 AM
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