flat plane cranks and crossplane cranks

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   flat plane cranks are what inline allis four cylinders have . crossplane is your american v8 with large counterweights. Ferrai v8 is flat plane with little to no counterweights  because pistons cancell out each other. They are used for quick acceleration and high rpm applications.   

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mlpankey Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 13 Sep 2009 Location: Vols country Points: 4580	Post Options Post Reply Quote mlpankey Report Post Thanks(0) Quote Reply Topic: flat plane cranks and crossplane cranks Posted: 05 Nov 2012 at 5:16pm
	flat plane cranks are what inline allis four cylinders have . crossplane is your american v8 with large counterweights. Ferrai v8 is flat plane with little to no counterweights because pistons cancell out each other. They are used for quick acceleration and high rpm applications.

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Rod B Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 25 Jul 2011 Location: Peoria Points: 415	Post Options Post Reply Quote Rod B Report Post Thanks(0) Quote Reply Posted: 06 Nov 2012 at 7:01pm
	Onk key piece of information you leave out is that ferrari has a main berring for each pair of cylinders where allis does not. That extra support is needed to controll crank flex. Counterweights are not needed to balance, but without support from extra main crank flex will be excessive unless counterweights are used to aid. This is why so many of the top competing antique 4 cyl pulling engines are going for counterweighted crankshafts. This is also why some chose to build additional main berring supports in engines that lack them from original design. So you don't have to try and fool the uneducated reader into thinking that an allis can rev like a ferrari without extensive work. Edited by Rod B - 06 Nov 2012 at 7:01pm

mlpankey Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 13 Sep 2009 Location: Vols country Points: 4580	Post Options Post Reply Quote mlpankey Report Post Thanks(0) Quote Reply Posted: 06 Nov 2012 at 7:46pm
	Its just because they are not current on the latest rage. Rod you can now research linginfilters ls6 turbo camaro with flat plane crank. Keeping bob weight mass close to cranks centerline reduces forces on crank and if its balanced at 5500 then vibration will start at a higher rpm and increaae proportionaly with increase of rpms.The only way counterweights would reduce second vibrations would be if they were position on the side of crank throw instead of opposite of rod and piston. Then theres the vibration that doing that creates. Edited by mlpankey - 07 Nov 2012 at 6:46am

mlpankey Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 13 Sep 2009 Location: Vols country Points: 4580	Post Options Post Reply Quote mlpankey Report Post Thanks(0) Quote Reply Posted: 06 Nov 2012 at 8:01pm
	Even nascar realised that you can over mass a counterweight when they experienced bearing failure when engine rpms left the 8grand and went into the 9200 area. Holding a ball in your hand rotating it around above your head doesnt generate near the force the same ball on a three inch string generates through the same motion. Edited by mlpankey - 07 Nov 2012 at 6:45am

Butch(OH) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 11 Sep 2009 Location: Lucerne Ohio Points: 3834	Post Options Post Reply Quote Butch(OH) Report Post Thanks(0) Quote Reply Posted: 07 Nov 2012 at 12:37pm
	Your forgot a couple Air plane cranks is what you put in a airplane motor no matter if in-line or out of line. Those of you considering an air plane crank should be forwarned that there are some imposters around. These are known as hot-air plane cranks by those in the know. They look like regular airplane cranks but they are not!! Always test an air plane crank to see if it is full of hot air before using it!!

mlpankey Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 13 Sep 2009 Location: Vols country Points: 4580	Post Options Post Reply Quote mlpankey Report Post Thanks(0) Quote Reply Posted: 07 Nov 2012 at 2:38pm
	yeah if your plane is like butch's and cant leave the ground Edited by mlpankey - 07 Nov 2012 at 3:39pm