crankshaft desighn question
#2494411
05/10/18 03:08 PM
05/10/18 03:08 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
OP
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OP
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Kalispell Mt.
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Just a hypothecical question is all as I am sure "they" have figured out a reason for doing it this way but on typical V8 engines, how come the first two journals are 90* apart then the next two are 180* apart then another 90*? Why would it not be better to be 180* on the first two so the balance would cancel each other out, then 90* then another 180* so the last two more or less cancel each other out, seem it would balance a lot easier that way and you could have a lighter crank right? What am I missin?
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: crankshaft desighn question
[Re: HotRodDave]
#2494460
05/10/18 05:27 PM
05/10/18 05:27 PM
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Joined: Jan 2005
Posts: 12,419 Kalispell Mt.
HotRodDave
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OP
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yeah Im not thinking of a flat plane.
It just seems the two front journals (front 4 cylinders) would balance each other and the back two journals would balance each other meaning no or very little counter weights, more like two V4 engines.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: crankshaft desighn question
[Re: HotRodDave]
#2494477
05/10/18 06:10 PM
05/10/18 06:10 PM
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Joined: Jun 2007
Posts: 145 Chicagoland 'Burbs
SlickRS23
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member
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Posts: 145
Chicagoland 'Burbs
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I remember back in the late '80's or early '90's, Might of been Buddy Ingersoll, use to run a Buick with a flat crank in comp Eliminator. Sounded like it was fartin' when it ran. I believe it ran pretty well if I remember correctly. Back when he ran the turbo pro stock. Jeff
Last edited by SlickRS23; 05/10/18 06:13 PM.
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Re: crankshaft desighn question
[Re: SlickRS23]
#2494480
05/10/18 06:15 PM
05/10/18 06:15 PM
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Joined: May 2012
Posts: 1,834 South Bend
John Brown
top fuel
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top fuel
Joined: May 2012
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South Bend
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I remember back in the late '80's or early '90's, Might of been Buddy Ingersoll, use to run a Buick with a flat crank V6 in comp Eliminator. Sounded like it was fartin' when it ran. I believe it ran pretty well if I remember correctly. Back when he ran the turbo pro stock. Jeff It ran so well, they invited him to not bring the car back. Other pro stockers said he was cheating because he was way faster than they were, and they were cheating, so they knew he had to be to.
July 19th should be "Drive Like Rockford Day". R.I.P. Jimmie.
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Re: crankshaft desighn question
[Re: SlickRS23]
#2494491
05/10/18 07:27 PM
05/10/18 07:27 PM
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Joined: Dec 2009
Posts: 275 brisbane,australia
coletrickle
enthusiast
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enthusiast
Joined: Dec 2009
Posts: 275
brisbane,australia
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I remember back in the late '80's or early '90's, Might of been Buddy Ingersoll, use to run a Buick with a flat crank in comp Eliminator. Sounded like it was fartin' when it ran. I believe it ran pretty well if I remember correctly. Back when he ran the turbo pro stock. Jeff Im not sure if the buick V6's ever had a flat plane crank but they did have what they called an ODD FIRE crank,And for sure it sounded diffrent but man did they make some power.It was in 1992 and i was helping a comp team and helping at the shop and Mr Cook as he was called had a 230 ish odd fire buick d/ed made over 600 on the dyno,qualified number 1 at houston and blew up bad,fixed it over nite and made eliminations,they have an over lapping jounal and thats the weak point.I saw a full effort odd fire comp d/d make 3.1hp per inch.Comp was great back then heaps of innovation and crazy stuff.
Last edited by coletrickle; 05/10/18 07:28 PM.
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Re: crankshaft desighn question
[Re: HotRodDave]
#2494583
05/11/18 12:16 AM
05/11/18 12:16 AM
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Joined: Jan 2003
Posts: 20,182 Park Forest, IL
slantzilla
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,182
Park Forest, IL
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Warren Johnson experimented with the flat crank. Warren said the idea was to have tuning capabilities like 2 separate engines. I don't think it made it past testing. The offset pins were the even fire crank Buick started in the '80s. I had a couple odd fire motors. Smooth was not a word you would use to describe them.
"Everybody funny, now you funny too."
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Re: crankshaft desighn question
[Re: polyspheric]
#2494751
05/11/18 01:49 PM
05/11/18 01:49 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
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I Live Here
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Thank you, Poly.
Time to pick nits: The Taurus SHO V8 was a 60 degree V8, as was its son, the Volvo V8 which could be had for a couple of years in the largest XC model. It was created by adding a pair of cylinders to the V6 SHO engine that had been built by Yamaha. I guess it was economical to use the same bank angle. Most bank angle choices are dictated by economics.
A 60 degree V6 is usually built with a crankshaft with the three crankpins at 120 degree angles. It is very unusual to find a 60 degree V6 with split crankpins like the later Buick or the 4.3 Chevy or the 3.9 Mopar engines. Here's what is in Wikipedia about the 60 degree V6: "In the 60 degree design, the connecting rods are attached to individual crankpins, which are angularly displaced at 120 degree intervals. This geometry results in an even firing interval, eliminating primary vibration and reducing secondary vibration to acceptable levels." My V6 SHO has a very simple crank with three throws and runs smoothly to 8000rpm or thereabouts.
R.
Last edited by dogdays; 05/11/18 01:50 PM.
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Re: crankshaft desighn question
[Re: HotRodDave]
#2494835
05/11/18 06:02 PM
05/11/18 06:02 PM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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I'd explain, but then I'd be wrong.
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