| Author | Topic |
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Location:
Lost in the K hole
Registered:
May 2002
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Re: Increasing Conrod Length
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Mon, 09 February 2004 10:00
 
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ey bro!
| Quote: |
- you can increase the RPM at which the "critical piston speed" is reached (thus we achieve a higher reving motor).
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from thinking about this for about 2 minutes, im thinking the peak velocity of the piston should not be related to rod length as youre suggesting...
peak velocity will occur when the crank angle is 90deg BTDC and 90deg BBDC. a shorter rod will be less than perpendicular to both the crank and piston at this point, and thus the speed of the crank journal wont be 100% transferred to the piston. the longer the rod becomes, however, the closer to perpendicular the rod orientation will be to both the crank and piston, and thus, the velocity of the piston will actaully increase -> approaching the speed of the crank itself.
ie, what im saying is: the longer the rod - the higher the peak piston velocity (approaching the crank velocity - which is governed by stroke length).
i think the main advantage of the long crank is the fact that it travels through less of an arc per crank revolution, and thus your dealing with an accelerating system of lower inertia. it would also put less side forces into the piston, thus reducing friction and wear on the skirts (in fact you could install pistons with shorter skirts - further reducing weight and friction in the reciprocating assembly)
| Quote: |
As for the headgasket are there any disadvantages in this scanario to using the thickest, "robust enough" headgasket (say which has been used in high power super/turbocharged applications to reduce the compression ratio)?
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YES!! thicker head gaskets will open up your squish clearance between piston dome and head at TDC which will dramatically increase the likelyhood of detonation at high load. instead, you should aim for normal hg thickness with a TIGHT squish clearance, and concentrate on combustion chamber relieving and piston dome contours to get your totla combustion chamber volume up
cheers mate!
hope youre doing well!!
ed
[Updated on: Mon, 09 February 2004 10:06]
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| | Subject | Poster | Date |
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Increasing Conrod Length
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humble | Mon, 09 February 2004 02:52 |
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Re: Increasing Conrod Length
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shinybluesteel | Mon, 09 February 2004 03:39 |
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Re: Increasing Conrod Length
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clubagreenie | Mon, 09 February 2004 03:47 |
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Re: Increasing Conrod Length
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gianttomato | Mon, 09 February 2004 06:38 |
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Re: Increasing Conrod Length
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humble | Mon, 09 February 2004 09:20 |
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Re: Increasing Conrod Length
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CelicaRA45 | Mon, 09 February 2004 09:42 |
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Re: Increasing Conrod Length
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gianttomato | Mon, 09 February 2004 12:06 |
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Re: Increasing Conrod Length
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ed_ma61 | Mon, 09 February 2004 10:00 |
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Re: Increasing Conrod Length
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sideshow | Mon, 09 February 2004 10:11 |
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Re: Increasing Conrod Length
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justcallmefrank | Mon, 09 February 2004 10:14 |
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Re: Increasing Conrod Length
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CelicaRA45 | Mon, 09 February 2004 11:00 |
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Re: Increasing Conrod Length
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sideshow | Mon, 09 February 2004 11:51 |
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Re: Increasing Conrod Length
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justcallmefrank | Mon, 09 February 2004 12:03 |
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Re: Increasing Conrod Length
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Allan | Mon, 09 February 2004 12:07 |
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Re: Increasing Conrod Length
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gold28 | Tue, 10 February 2004 02:30 |
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Re: Increasing Conrod Length
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roger | Wed, 11 February 2004 01:03 |
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Re: Increasing Conrod Length
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gianttomato | Wed, 11 February 2004 23:53 |
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Re: Increasing Conrod Length
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gold28 | Thu, 12 February 2004 00:44 |
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Re: Increasing Conrod Length
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draven | Thu, 12 February 2004 00:56 |
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Re: Increasing Conrod Length
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gianttomato | Thu, 12 February 2004 05:50 |
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Re: Increasing Conrod Length
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TerryOBeirne | Thu, 12 February 2004 06:39 |
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Re: Increasing Conrod Length
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slydar | Thu, 12 February 2004 10:57 |
