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Old 08-30-2018, 12:00 PM   #1
Chilm
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Default Knif edging your crankshaft.

Hi guy's

I want to knive edge my B230FK crankshaft, but I have a few questions about it.
Reason: cuts smoother through the oil(mist), less drag, lighter bottom end, faster in the rev's.
And curious if I have the skills

What will it do with the torque, I mean torque will be less but is that noticable?

After doing that it will be re-balanced again.

What are you brickers thoughts about this plan?
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Volvo 945 - Blue Pearl - LPT Polar 2.3 Limited Edition
B230-FK Turbo - 90+ ported - 15G Ported - Airintake
Erland Cox Regrind - Blabla Chips - 3 inch exhaust
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Old 08-30-2018, 12:32 PM   #2
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My thought is that with some very careful dyno testing, you might actually be able to tell the difference. If other conditions were controlled enough.
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Old 08-30-2018, 12:48 PM   #3
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Torque curve may change, but you should not lose any. Just lighten flywheel / get billet one.
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Old 08-30-2018, 12:48 PM   #4
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Quote:
Originally Posted by Chilm View Post
Hi guy's

I want to knive edge my B230FK crankshaft, but I have a few questions about it.
Reason: cuts smoother through the oil(mist), less drag, lighter bottom end, faster in the rev's.
And curious if I have the skills

What will it do with the torque, I mean torque will be less but is that noticable?

After doing that it will be re-balanced again.

What are you brickers thoughts about this plan?


You'll notice more by doing this.
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Old 08-30-2018, 02:12 PM   #5
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Quote:
Originally Posted by John V, outside agitator View Post


You'll notice more by doing this.
As honest as allways John, experienced fapper?

No really, not a good idea?
Did they evah try this out with the group A in Sweden?

Quote:
Originally Posted by Egez View Post
Torque curve may change, but you should not lose any. Just lighten flywheel / get billet one.
It's not amanual.
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Old 08-30-2018, 02:21 PM   #6
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Quote:
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It's not a manual.
Your chances of ever actually noticing a difference just went to (statistically speaking) 0.
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Old 08-30-2018, 03:25 PM   #7
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Is the motor spinning over 6k rpm continuously? If not, crank scrapers and knife-edging aren't going to do so much for ya.
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Old 08-30-2018, 03:46 PM   #8
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No point in knife-edging if a dry sump will get you more for your efforts.

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You'll notice more by doing this.
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Old 08-30-2018, 04:29 PM   #9
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O.k. guy's, points taken
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Old 08-30-2018, 05:34 PM   #10
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Quote:
Originally Posted by Chilm View Post
As honest as allways John, experienced fapper?

No really, not a good idea?
Did they evah try this out with the group A in Sweden?



Group A homologation form lists under point 319.h the minimum weight of the crankshaft...
For example, the Frod Squierror with a YBB built explicitly built to beat the old B21 240s has a minimum weight of 14,100g....notice they list it as grams*... People have been disqualified for being just a few grams underweight in some internals...
Pretty hard to knife edge the crank without it getting lighter.




*The homologation form for the Exsquirt Crossways with a YBG
Shows a minimum weight of 14,200 grams.. Oddly enough its the same part number.
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Old 08-30-2018, 07:00 PM   #11
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Quote:
Originally Posted by John V, outside agitator View Post
Group A homologation form lists under point 319.h the minimum weight of the crankshaft...
For example, the Frod Squierror with a YBB built explicitly built to beat the old B21 240s has a minimum weight of 14,100g....notice they list it as grams*... People have been disqualified for being just a few grams underweight in some internals...
Pretty hard to knife edge the crank without it getting lighter.




*The homologation form for the Exsquirt Crossways with a YBG
Shows a minimum weight of 14,200 grams.. Oddly enough its the same part number.
Thanks for your reply John, clear now.
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Old 08-31-2018, 10:53 PM   #12
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knife edge to cut windage add weight back in with Mallory metal
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Old 09-01-2018, 04:49 AM   #13
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For fark sake mister Vanlandingham, you just made my day. It's been a very long time we talked on the phone but it's coming back to me now
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Old 09-01-2018, 04:51 AM   #14
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@Chilm; I told you several times, you are taking some things waayyyyyyy to far. Listen to the people who have build several 8 valve tractor engines.
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Old 09-01-2018, 02:23 PM   #15
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@Chilm; I told you several times, you are taking some things waayyyyyyy to far. Listen to the people who have build several 8 valve tractor engines.
You dunno what I'm aiming yet
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Old 09-02-2018, 06:29 AM   #16
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Seeing you are not ordering a samsonas gearbox, some big ass rear axle, I think you'll be fine with not going overboard. ;)
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Old 09-02-2018, 01:33 PM   #17
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A customer of mine had it done in his car. Jason Goodley. It is hard to say if that one thing helped.. But that little car 244 was a rocket in its day. Ran a few 7.8 in the eigth at 20 some psi in 2003 out at kennedale dragway. He had a lot of other supporting mods , and they all seem to work very well together. If I may bore you with details.. Serious ported 8v head by one of Bob norwoods guys, special cam, 93 ported manifolds, b23ft, with imported b23et pistons, shot peened b21ft rods, knife edged b23ft crank, o ringed block, copper headgasket ( nobody made them then so he and I did a run of them and they mostly sucked)haltech e6a, crane hi 6 r full ignition with fireball coil, m46 with American power and brake clutch, drag slicks on open diff , 60-1 turbo, npr intercooler.. I ended up buying this car about 5 years ago. Rebuilt it, got it running. Then sold it.
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Old 09-02-2018, 02:20 PM   #18
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all that work and no posi?
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Old 09-02-2018, 02:47 PM   #19
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Want to see how important it is? Search Google Images for "F1 crankshaft" and see if you find any knife edged cranks.....
Since Eff Juan is ass-fault I don't pay any attention to it, but I hear they do rev their engines up..Probably a bit higher than road car Volvo.
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Old 09-02-2018, 05:06 PM   #20
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Quote:
Originally Posted by haltechsupra View Post
A customer of mine had it done in his car. Jason Goodley. It is hard to say if that one thing helped.. But that little car 244 was a rocket in its day. Ran a few 7.8 in the eigth at 20 some psi in 2003 out at kennedale dragway. He had a lot of other supporting mods , and they all seem to work very well together. If I may bore you with details.. Serious ported 8v head by one of Bob norwoods guys, special cam, 93 ported manifolds, b23ft, with imported b23et pistons, shot peened b21ft rods, knife edged b23ft crank, o ringed block, copper headgasket ( nobody made them then so he and I did a run of them and they mostly sucked)haltech e6a, crane hi 6 r full ignition with fireball coil, m46 with American power and brake clutch, drag slicks on open diff , 60-1 turbo, npr intercooler.. I ended up buying this car about 5 years ago. Rebuilt it, got it running. Then sold it.
That's the trick, every little bit helps.
Getting the complete picture then, learned from what I've been reading and hearing and have experienced.
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Old 09-02-2018, 06:06 PM   #21
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There are already threads about forged cranks vs cast crankshafts if you want to explore Volvo crankshaft discussion more. Here is a discussion on the strongest stock short block.
http://forums.turbobricks.com/showth...ged+crankshaft
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Old 09-02-2018, 10:03 PM   #22
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Quote:
Originally Posted by Chilm View Post
That's the trick, every little bit helps.
Getting the complete picture then, learned from what I've been reading and hearing and have experienced.
Every little bit helps: Truthiness
Every little bit costs money....some little bits may theorectically help, but the "help" may not be measurable, or detectable...The money is delectable, but a quick cost/benefit analys will show certainty that the cost of some "little bit" which is not detectable is not worth it---as if seeing piccies of F1 cranks NOT knife edged wasn't enough to nail this coffin closed..Come on THINK of the pooor horses.
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Old 09-02-2018, 10:51 PM   #23
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Not sure what the goal is, but rather than maxing out the tiny little things (which helps but) maybe bigger turbo/more boost/more cylinders? I think I'm agreeing with John V...is that a powerpoint John?
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Old 09-03-2018, 12:33 AM   #24
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Quote:
Originally Posted by 2turbotoys View Post
Not sure what the goal is, but rather than maxing out the tiny little things (which helps but) maybe bigger turbo/more boost/more cylinders? I think I'm agreeing with John V...is that a powerpoint John?
Personlly the fixation boys have on motors might make more sense if that was the only thing that made a car go, or go quickly.. But as I've said for maybe 40 years, we don't drive/ride motors, we drive/ride cars/bikes.. I have seen more cars sunk by crap gearbox and final drive than lousy motors.. And from being a slave to silly fads...excesses in one thing--for a "look" or "street cred"..
Maybe this guy could being by throwing the autotragique versnellingsbaks in the nearest canal..

And think/talk %s ..xx% quicker?
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Old 09-08-2018, 04:21 PM   #25
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Quote:
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Personlly the fixation boys have on motors might make more sense if that was the only thing that made a car go, or go quickly..
I've certainly gotten into plenty of trouble with 115hp cars.

That said, one of my favorite automotive quotes is from Enzo Ferrari:

"Aerodynamics is for people who can't build engines"
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