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Main : Misc : News lightened crankshaft

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lightened crankshaft
lightened crankshaftPopular
SubmitterLemonheadMore Photos from Lemonhead   Last Update2005/1/26 6:02    Tell a friendTell a friend
Hits5596  Comments11    0.00 (0 votes)0.00 (0 votes)
Knife edged crankshaft

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The comments are owned by the poster. We aren't responsible for their content.

Poster Thread
Dodgeman
Posted: 2005/1/26 11:46  Updated: 2005/1/26 11:46
No life (a.k.a. DattoMaster)
Joined: 2003/6/27
From: Southern Tablelands N.S.W. Australia
Posts: 8287
 Re: lightened crankshaft
Well, we have seen the clutch, the flywheel & the roller rockers on the beautifull cylinder head, so this crank should come as no surprise.
I, for one, am incredibly impressed as this engine is everything that i would love to have in my coupe. Some of my specs would be a little more tame, & the core engine would still be the 1200, but a properly engineered, well built engine is a true work of art, & thats what this one is.

If i thought i could justify it, i would ask if you could do a slightly more street oriented versoin of this for me.

Bloody good job Lemonhead.

Poster Thread
D
Posted: 2005/1/26 22:17  Updated: 2005/1/26 22:17
No life (a.k.a. DattoMaster)
Joined: 2002/10/28
From: Criminal Pig free land
Posts: 10810
 Re: lightened crankshaft
This crank is what should be available in a forge from Matsuoka or pitroad. They should take a leaf out your book.
Oil surface area looks like it will be almost double on this crank.
As for 50 bucks an hour HaAh!! not to do it this good

Dodge do you know if the late a10 engine still has 3 main bearings?

Poster Thread
datman55
Posted: 2005/1/26 23:18  Updated: 2005/1/26 23:18
Home away from home
Joined: 2003/10/28
From: Perth
Posts: 848
 Re: lightened crankshaft
Now that's a work of art...awesome job Lemonhead.

Poster Thread
Dodgeman
Posted: 2005/1/27 11:18  Updated: 2005/1/27 11:18
No life (a.k.a. DattoMaster)
Joined: 2003/6/27
From: Southern Tablelands N.S.W. Australia
Posts: 8287
 Re: lightened crankshaft
Quote:
Dodge do you know if the late a10 engine still has 3 main bearings?

D
As far as i know, ALL A10's had three main bearings. Bummer.

Poster Thread
kegs
Posted: 2006/1/8 7:18  Updated: 2006/1/8 7:18
No life (a.k.a. DattoMaster)
Joined: 2003/1/5
From: campbelltown (sydney) australia
Posts: 1802
 Re: lightened crankshaft
i know this is old post but i am interested in doing a knife edge crank just to give it a try, and im curious bout a couple of things. u say to drill and tap, then plug the oil holes which ones and why. and then when u say radius the angles do u mean where the crank becomes round for the bearings and that?

Poster Thread
Lemonhead
Posted: 2006/1/9 7:02  Updated: 2006/1/9 7:02
Home away from home
Joined: 2004/1/1
From: Brisbane
Posts: 657
 Re: lightened crankshaft
kegs, If you have a look at a crankshaft at the big end part of it you will see at an angle there will be a small (about 5-6mm) plug which plugs up the main oil gallery. If you follow the angle of these galleries they end up at the main bearing journal picking up on the hole in your big end journal.
The oil from your pump comes in through the centre main bearing and travels along these journals to the big end bearings.
When you machine the angle for your knife edge you machine off these oil gallery plugs (or most of them)
This is where you "flick" out the remainder of the lead plug, clean out the gallery and drill and tap the oil gallery holes to take a grub screw.
As for the radiusing you MUST make sure that where ever you have machined down to a shoulder you never leave a 90 deg. or any form of sharp line/groove in the crank anywhere. Everything has to be smooth.
Hope this helps
Gary

Poster Thread
pager
Posted: 2006/1/9 8:47  Updated: 2006/1/9 8:47
Home away from home
Joined: 2003/3/21
From: Tamworth, NSW
Posts: 838
 Re: lightened crankshaft
sweet as !!!
i am dead keen to hear how your motor runs

Poster Thread
Lemonhead
Posted: 2006/1/9 11:02  Updated: 2006/1/9 11:02
Home away from home
Joined: 2004/1/1
From: Brisbane
Posts: 657
 Re: lightened crankshaft
pager, Not being a smartarse, but add all of my photo's together in my album sprinkle it with a bit of imagination and 125 ponys (at the back wheels) pushing you along, throw it all on a dirt road and its a hell off a fun ride!!

Poster Thread
kegs
Posted: 2006/1/9 11:01  Updated: 2006/1/9 11:01
No life (a.k.a. DattoMaster)
Joined: 2003/1/5
From: campbelltown (sydney) australia
Posts: 1802
 Re: lightened crankshaft
ill have to have a chat to jeff taylor next time im at his shop, i know he does knife edge cranks in his garage he might have one he can show me in more detail, thanks for the reply anywas, it has made me think more about trying it for myself, i wanna try doing this to the a12 crank for maybe a future stroker motor like jeffs race car.mmm 1560cc a12 ......

Poster Thread
converted
Posted: 2005/1/26 23:32  Updated: 2005/1/26 23:32
No life (a.k.a. DattoMaster)
Joined: 2002/6/7
From: Newscastle, Australia
Posts: 2479
 Re: lightened crankshaft
Work of art Gary...
You should go Into mass production...send the template to a Chinese macining company and we could get them done for $50 all up...
Where do I place and order for one?

Poster Thread
Lemonhead
Posted: 2005/1/27 9:17  Updated: 2005/1/27 9:17
Home away from home
Joined: 2004/1/1
From: Brisbane
Posts: 657
 Re: lightened crankshaft
Thanks Fella's I really appreciate it...
As for doing more of these for other people I REALLY wish I had the time to do so, to me to do this sought of machining job as well as any other preperation jobs to race/street cars ie. rollcages, suspension upgrades, brake modifications, specialist machining, race cars preparation in general would be a DREAM job come true.
The reality is I have a demanding job and a young son who has just started grade 1 and who is my best mate, so between my work and family I don't have much spare time.
Later on in life when things settle down I will definately be pursuing this style of work.

Poster Thread
Lemonhead
Posted: 2005/1/27 10:08  Updated: 2005/1/27 10:08
Home away from home
Joined: 2004/1/1
From: Brisbane
Posts: 657
 Re: lightened crankshaft
Yes I have carried out the oil gallery modification, Any engine rebuild I do from now on I will be drilling out the "plugs" on the oil galleries and cleaning them out, the amount of crap I got out of this crankshaft was unbelievable, for the sake of drilling out the plugs and drilling and tapping threads in the galleries for grub screws (which are loctited and penned over) its well worth the effort.(just remember there could be at least 20yrs of build up in there)
As for how much to take off.....If your going to do a job do it properly and do it to the max! You now have a photo as a guide as to how much to take off.
The gains from this mod and other mods to the bottom end is I now have a race motor that has instant responce and revs cleanly and beautifully till the computer shuts everything down at 8500rpm.
For those of you who might attempt this mod just remember you MUST NOT leave any shoulders in your machining, all angles MUST be radiased(?)
a14force, keep working on your dad, dads are a wealth of knowledge and support.
Gary

Poster Thread
A14force
Posted: 2005/1/27 8:56  Updated: 2005/1/27 8:56
No life (a.k.a. DattoMaster)
Joined: 2003/12/3
From: Christchurch NZ
Posts: 3703
 Re: lightened crankshaft
How did you know how much to take off?
An A series crank would probably fit in my dad's lathe. If he wasn't getting so ill tempered with age, I might be able to talk him into it.
Besides less weight, what gaines does this give?
Less oil friction?

Have you carried out the oil gallerie modification ?
If not, get Dodgeman to email you a picture of it.

Poster Thread
Lemonhead
Posted: 2005/1/26 6:05  Updated: 2005/1/26 6:05
Home away from home
Joined: 2004/1/1
From: Brisbane
Posts: 657
 Re: lightened crankshaft
Total of 2kg's removed.

Poster Thread
A14force
Posted: 2005/1/26 6:43  Updated: 2005/1/26 6:43
No life (a.k.a. DattoMaster)
Joined: 2003/12/3
From: Christchurch NZ
Posts: 3703
 Re: lightened crankshaft
looks expensive.
How is this done? In a lathe?-

Poster Thread
Lemonhead
Posted: 2005/1/26 8:03  Updated: 2005/1/26 8:03
Home away from home
Joined: 2004/1/1
From: Brisbane
Posts: 657
 Re: lightened crankshaft
Yes I did this on a lathe and milling machine.
Cost: Standing on my feet for six hours ($50/hr) and balancing.

Poster Thread
MLS
Posted: 2005/1/26 11:29  Updated: 2005/1/26 11:29
Just can't stay away
Joined: 2004/12/10
From: Melbourne
Posts: 145
 Re: lightened crankshaft
Interested in doing an A12 crank?