Build on "the competition",......
- Thread starter Killer6
- Start date
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67Dart273
Well-Known Member
I already posted this. LOLOL You are treed..........................
Long way around--58 Chev 6/ Wayne head/ twins/ EFI/ insert bearings
Like I said................Long way around. MAN they did a lot of work to that poor old block
Long way around--58 Chev 6/ Wayne head/ twins/ EFI/ insert bearings
Like I said................Long way around. MAN they did a lot of work to that poor old block
Very interesting stuff. I wonder what the price tag was? I'll bet it was astronomical.
Yeah, gotta have deep pockets to pay somebody to build that, not to mention the custom parts design & mfr.,........but somebody does!
Not sure why you would go through so much effort and knowingly choose a block with fewer mains.
The guy at 12bolt.com has been doing turbo'ed straight six's for awhile.
The guy at 12bolt.com has been doing turbo'ed straight six's for awhile.
Heard that argument all my life regarding the slant 6, but it never seemed to make a difference. I think it's ultimately the design of the entire package that comes into play, not just the number of main saddles.
What are You willing to spend? Those engines were a mess head-wise, there was a lot more to be gained on avg in that case.
So an established & renowned NAPCAR engine builder thought it was such a concern that He saw fit to cut the mains down and the rod journals decreasing overlap w/o even increasing stroke, AND putting boost to it, AND stating it'd do 700+ if they wanted it to.......
I admittedly am still learning but when I was building a nitrous motor it was explained to me that you are basically putting a lot of force on the crank pushing it out the bottom of the motor. Boost would be doing the same thing no? Not sure if you are saying why I would question a renowned builder or if you are agreeing. Im just a guy listening to what the guy said. He brought attention to the fact that they were choosing a motor that had fewer mains. RRR said it was no big deal. I believe you are saying the same. Great, its no big deal. Logically to me...Id probably go for more mains. Shed some light on me and explain how fewer mains is no big deal when dealing with those type of power levels. Im open to it.
my68barracuda
Well-Known Member
4 vs 7 mains in an inline 6 depends upon where the engine design group is placing more importance.
Inline 6 cylinder engines have excellent balance and a lack of secondary vibrations due to the crank throws being 120 degrees from each other. Two pistons at TDC two pistons at BDC and two pistons at mid stroke on every engine revolution. That helps the 4 main bearing design survive as dynamically the rotary motion is self balancing. The 7 main design has a shorter span between the crank supports so it will have greater stiffness and less flex at the crank. That is likely important when there are very large crankshaft loads as seen in HD large bore diesel long haul truck engines as all of those in line 6 cylinder engines are 7 main bearing designs.
So basically 7 mains are better than 4, but 7 is not needed in all applications.
There are a number of parameters in play here. First up, V8s only have 5 mains, so there are more mains/cyl in a 4-main 6cyl. If the main dia & rod jornal dia are sized right, there is overlap & rigidity, but there is more friction. There is more room for wider, heavier, & thus stronger throws for a given alloy/mfr.....but it is much heavier, & needs to be. If quick rev response up & down is the goal, lighter is better, not a real problem for a turbo'd mill primarily aimed at the drag-times & pulling. There's also the inline evil of crank twist because of the shaft length, here the amount of mains can reduce off-axis deflection when there is enough load or the onset of detonation, but there is also a less forgiving/shorter stress path w/7 mains. In other words, it may not deflect, but may break....sort of like forged vs cast, stronger will flex more vs less strength more rigid...most of those old forged cranks were overkill, to their detriment, as long as the block & mains can handle the load they're good. The center cap work on those old blocks is enough to take a bunch.....hope that made some sense....
CNC-Dude
Well-Known Member
Just so you are corrected, 12bolt.com had absolutely nothing to do with that turbo truck in the video you posted above. That truck and engine was constructed and fully machined by the truck owners in Texas, the Staph Brothers. They are also featured in Leo Santucci's book showing all their details and machine shop they own.
What about my statement needs correcting? Just a guy here, but I dont believe I stated that 12bolt had a hand in the build. Carry on.
CNC-Dude
Well-Known Member
Posting the video and then making that statement below it in the same post appeared you were indicating he had his hands in that build. The way the post is worded implies that....
Fair enough. My statements are.....
and then I leave space
to then post another thought.....
Great build.
In reference to the mans own words @ 5:20 in the video....
and then I leave space
to then post another thought.....
Great build.
ooooooohhh My apologies CNC dude. I am mistaken. Now Im dumb. I get it now. grovel grovel grovel......
Nevertheless, that's a badass truck, thx for linking...
Yeah, that helps the sting of being stupid. Thanks Killer6! Man....this crow is delicious! ugh.
CNC-Dude
Well-Known Member
You are not stupid at all, I've seen a lot of your posts in the past and would never try to imply that towards you or anyone else. Yes, it's a killer truck. It would be nice to see someone with a Slant build one to that extreme if money was no object. LOL
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