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#41
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A little grinding on the corner of the main cap and I used a stock dipstick with my deepened Canton.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#42
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Finally got it done! Everything came out awesome. Caps fit perfect, thrust is cut within .001 and the tapping went smooth with no vented water jackets.
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The Following 2 Users Say Thank You to spectramitch For This Useful Post: | ||
#43
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You did an excellent job on your splayed 4 bolt cap conversion. The only thing I like better is to put a stud on the outer bolt as I feel that the stud is better on clamping load. Excellent work!!!
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#44
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Superb work!
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I do stuff for reasons. |
#45
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I just want to say, DIY ? That machine shop looks nicer than 95% of the shops that do splayed billet caps for a living.
Very nice, good luck with it. |
#46
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Quote:
Nothing like taking on a task like that and succeeding... it will feel great knowing the muscle under your hood was done by you! Job well done! |
#47
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Good job.. thanks for sharing your adventure
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*** THE BIG BRACE is here *** |
#48
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Well she is back in my hands and its time to start checking clearances. I am wondering what torque sequence is proper for the Splayed caps? Do I finish torque studs then do the splayed bolts? or incrementally both of them? The engine machinist specified 100ft/lbs on studs and 65ft/lbs and splayed.
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#49
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Correct, torque the main studs in steps to final torque, and then torque the splays in steps; typically mains in 3 steps and splays in 2. The main studs secure the crank and set bearing crush and the splays tie the block together. Grade 8 bolts for the splays; not nitpicking and should be fine but just curious.
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#50
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I took mine down to 20 and then to full tq spec in one long pull.
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#51
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Well some disappointing news, checking main bearing clearance with my Mitutoyo tools I am ending up with .0038-.0045 using King MB5511HP-STD. My Brand new Scat Forged crank measures 2.9991-2.9993. I measured my actual main bore diameters by taking the Dial bore gauge, zeroing on the main, and then moving my Mic around it back to zero. Main Housing Bore is 3.1892-3.1899
Factory Spec is to be 3.188-3.189 with preference on the small side? Is this a redo align hone situation? |
#52
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My 455 was set up that loose, Great oil pressure and been running forever.
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#53
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Bearing Crush or Journal clearance?
does the 0.0038-0.0045 get divided by 2 for the Main journal Clearance? |
#54
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Journal Clearance, not sure what you mean by divide by two?
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#55
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HIS, I understand what you mean now that my clearances are twice the size they should be lol.
I cant believe this could be the reason for my excessive clearance...but the machine shop said use ARP thread lube for torquing. I didnt get the lube from summit yet so I just used oil for doing my bore checks. Is this ARP lube really going to tighten up my clearance? |
The Following User Says Thank You to spectramitch For This Useful Post: | ||
#56
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King makes a 0.001 tighter main bearing for 3" mains.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#57
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Your housing bore is too big by at least.001” it seems.
My FM bearing book calls for a minimum bearing clearance of .0006” to a max of .0036”.
__________________
I do stuff for reasons. |
#58
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I had my machine shop rework and drop the caps to tighten up my main bore housing to be on the small size of spec 3.1880. Now im getting clearances in the .0022 range. I am using King HP bearings and want to run a 30wt oil. Is the .0022 on the mains to tight for a street strip 3" main? Its a Scat forged 4.25 stroke, 12-1 compression SR cam.
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The Following User Says Thank You to spectramitch For This Useful Post: | ||
#59
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By "drop the caps", I assume that means cutting the caps? After they were done doing that, did they line hone the housing bores to make them round again and remove any taper from cutting the caps? There is a little more to finishing this up than just cutting caps. Your installation work of the caps looks very nice, just make sure it is finished 100%. I don't like to run a block without line honing. I like to finish the housing bores on a 3" main block at 3.1883-3.1884. I like 80% of the bore diameter to gauge at +-.0001 of that dimension with some growth toward the parting line. I like all 5 mains +-.0001 in taper. If you have those dimensions, your King bearings will have around..0028"-.0032 oil clearance. Looking really nice so far.
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#60
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As you know, Bearing crush is most important. Journal clearance can adjust for application.
I never really knew-for-sure what weight Oil is best for higp rpm racing. And assume it applies to Reliable Highway use. For me the Street oil weight considers the HFT cam needs. My efforts concluded 10W-20 to 10W-30, while ECM (Langer) may have joked about oils south of 0W-20. I dunno, and want to know. |
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