What's on the, INSIDE |
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What's on the, INSIDE |
Randal |
Mar 22 2009, 10:16 PM
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#1
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Advanced Member Group: Members Posts: 4,446 Joined: 29-May 03 From: Los Altos, CA Member No.: 750 |
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sww914 |
Mar 25 2009, 10:26 PM
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#2
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Advanced Member Group: Members Posts: 2,439 Joined: 4-June 06 Member No.: 6,146 Region Association: None |
One of the shops at Buttonwillow has a dyno that's not too expensive.
Chris, what's the advantage of Rabbit rods? |
Chris Hamilton |
Mar 26 2009, 09:31 AM
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#3
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Senior Member Group: Members Posts: 611 Joined: 7-March 06 From: Berkeley, CA Member No.: 5,687 |
One of the shops at Buttonwillow has a dyno that's not too expensive. Chris, what's the advantage of Rabbit rods? That would be nice, I'm sure cliff would be up for it. The rabbit rods fix the fact that the 914 didn't come with a very good rod-length ratio. The 914 engine doesn't "breathe" very well, and the increased rod-length ratio improves that. If you want the physics explanation, you get that Work equals the dot product of the force and direction vectors. W = F • d, which simplified for a 2-dimensional scenario becomes W = F * d * cos ( theta ). If you increase the rod length you decrease the change in angle caused by the sweep of the connecting rod and minimize the potential range of theta. Steve, you've driven Cliff's car, right? This rod length change manifests itself in a bunch more bottom end power. |
grantsfo |
Mar 26 2009, 01:31 PM
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#4
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Arrrrhhhh! Group: Members Posts: 4,327 Joined: 16-March 03 Member No.: 433 Region Association: None |
One of the shops at Buttonwillow has a dyno that's not too expensive. Chris, what's the advantage of Rabbit rods? That would be nice, I'm sure cliff would be up for it. The rabbit rods fix the fact that the 914 didn't come with a very good rod-length ratio. The 914 engine doesn't "breathe" very well, and the increased rod-length ratio improves that. If you want the physics explanation, you get that Work equals the dot product of the force and direction vectors. W = F • d, which simplified for a 2-dimensional scenario becomes W = F * d * cos ( theta ). If you increase the rod length you decrease the change in angle caused by the sweep of the connecting rod and minimize the potential range of theta. Steve, you've driven Cliff's car, right? This rod length change manifests itself in a bunch more bottom end power. So are you increasing stroke with these rods? What size cylinders and pistons? What is stroke? Assuming you are increasing displacement and compression ratio too? It makes sense if you stroke a stock 2.0 that you would get more displacement and power. |
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