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| bottom end blues https://www.slantsix.org/forum/viewtopic.php?t=14152 |
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| Author: | 71satelite [ Wed Aug 24, 2005 7:01 pm ] |
| Post subject: | bottom end blues |
Well, I recently built a slant that died way to early due to lack of break in, and poor oiling (I think). What is the secret for improving oiling to the rods and mains. What I am really asking is what is the formula for building a bullet proof bottom end for my performance street slant. Its got to be sturdy because its in my truck and I use it to haul things and haul a$$!!! Please help, I want this one to last! |
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| Author: | SlantSixDan [ Wed Aug 24, 2005 8:22 pm ] |
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H'm. Was this a stock or near-stock rebuild? Or a race engine? Reason I ask is that there's usually not a need to increase the bottom-end oiling over stock. (Not to say there aren't improvements that can be made—there are—but just to say that such improvements are seldom actually *necessary*.) Cast crank engine? Forged crank engine? |
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| Author: | 71satelite [ Thu Aug 25, 2005 2:27 am ] |
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Dan here is the set up: open element air cleaner holley 390cfm 4bl electric choke offenhauser 4bl intake 1977 stock head, newly rebuilt only mod is 3 angle valves and 360 valve springs headers straight pipes with flow masters, no cats comp cam duel pattern- advertised dur at 260, dur at.50 is 212, lift is .440, and sep is 110 lifters are comp cam flat tappet hydro accell cut to fit wires accell super stock coil MSD 5 box stock points distributor w/light recurve springs installed converter is stock tranny is stock 727 rear gears are unknown but stock, they seem kinda high for a truck vehicle is a short bed D150 Motor is an 85 with cast crank. Let me know I would love to beef up my oil flow a bit. |
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| Author: | slantvaliant [ Thu Aug 25, 2005 6:10 am ] |
| Post subject: | |
Doc had some suggestions for oiling improvements here: http://www.slantsix.org/articles/dutra- ... blocks.htm |
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| Author: | Doctor Dodge [ Fri Aug 26, 2005 4:42 am ] |
| Post subject: | |
The SL6 oil system is pretty basic, some general deburrring is usually all that is needed. The biggest two restriction points are in the oil pump and at the cam bearings. Increased oil flow by elimating passageway restrictions is a nice thing to do, this allows good oil flow without using excessive pressure. As we know, increasing oil pressure increases the load on the oil pump / cam gear and that can cause early gear failure. Also check the main cap bolts to be sure they are the correct length. The oil passages leading down to the crank bearing pass right thru the bottom of the cam side main cap bolt holes. If you use a longer then stock bolt or stud in this location, it will choke-off the passageway and reduce oil flow down to the crankshaft bearings. DD |
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| Author: | 71satelite [ Fri Aug 26, 2005 7:50 pm ] |
| Post subject: | |
Thanks for the great link, I wish I would have read this prior to building my last slant. Any good articles on crank prep available? |
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| Author: | Doctor Dodge [ Tue Aug 30, 2005 4:42 am ] |
| Post subject: | |
There is not much extra work to do with the crank. Deburr it, chamfer thr oil holes and then have the crank reground and balanced. DD |
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| Author: | sandy in BC [ Tue Aug 30, 2005 8:59 am ] |
| Post subject: | |
Did you say hydraulic lifters in an 85 block with a 77 head? Did you make sure the top end was oiled correctly for the hydro cam? |
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| Author: | Slant6Ram [ Tue Aug 30, 2005 10:08 am ] |
| Post subject: | Gears |
Quote: rear gears are unknown but stock, they seem kinda high for a truck
2.94 is a common gear for a slant six truck. Not very favorable for towing and keep the tires small. I'll be putting 3.21 gears into mine soon. It won't help the oiling other than by keeping the RPMs up a little  Towing with higher gears would be easier and maybe make the engine last a little longer.
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| Author: | 71satelite [ Tue Aug 30, 2005 4:15 pm ] |
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WHoa that is one heck of a point that I have never considered, a 77 head is solid cam and a 85 is a hydro. Would the oil passages be the same in both heads? |
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| Author: | Doctor Dodge [ Fri Sep 02, 2005 7:08 am ] |
| Post subject: | |
Oil passages are the same but the valve cover, rocker arms, pushrods are different. DD |
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