spinning motor over 8K rpm?
02-18-2012, 05:48 PM
#2
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Reciprocating mass.
Your bikes internals weigh much less allowing it to spins higher, like F1 cars.
I'm sure you could get a LS to spin that high, but it would not be cheap. Valve train would have to be the best of the best along with the bottom end.
Your bikes internals weigh much less allowing it to spins higher, like F1 cars.
I'm sure you could get a LS to spin that high, but it would not be cheap. Valve train would have to be the best of the best along with the bottom end.
02-18-2012, 07:24 PM
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Yes, strength increases with size, but so does weight. Now I'm no mathematician or physicist , but I know there are certain physics involved when dealing with weight and speed and such that make it hard to whip those pistons and rods around.
Hopefully someone smarter than me can come in here and give you more info, I just know a little about a little.
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02-18-2012, 07:41 PM
#8
The weight of everything makes a big difference. Its easier for a motor to yurn up higher if its got aluminum rods, light pistons, and then when you balance it the crank will be lighter too. On our pro mod we run titanium valves so the valve train can recover fast enough. You also have to be able to get enough air in the motor to let it pull that high too. The head and cam has got to be made to work that high. If you shorten up the stroke its easier also.
02-19-2012, 12:24 AM
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Originally Posted by JDStevens
If you shorten up the stroke its easier also.
http://www.youtube.com/watch?v=PaxE6dsfb_o
02-19-2012, 12:48 AM
#11
I can't see that video because of my gay *** goverenment issue Blackberry! I don't know a lot but I do know that when we shifted the blower motor at 8,800 we never had any trouble. When we went to 9,800 we started having more issues. Some of the hemi guys turn theirs 10,200 but I think they only run a 4" stroke.
02-19-2012, 01:10 AM
#13
Yeah, the 421 in my partner's 69 camaro was shifted at 8k and it has oliver rods and they're heavy. It has a 330 canted valve head and the cam is 292 @50 so you had to turn it pretty hard.
09-10-2013, 10:11 AM
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your bike runs H beam rods and a flat plane crankshaft ...
It has Ti retainers and stuff like that.
Less mass = more RPM
Bore - stroke ratio is something you want to take a look at too.
It has Ti retainers and stuff like that.
Less mass = more RPM
Bore - stroke ratio is something you want to take a look at too.
09-10-2013, 02:38 PM
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Just think about an F1 engine. They currently run 2.4l n/a V8. But their stroke is only 1.56 in. And they use pneumatic valve springs allowing them to turn 18,000 rpm. Traditional metal valve springs become obsolite at a certain rpm depending on camshaft design. Having a shorter stroke will lessen the inertia the crank, rods, wrist pins, and other bottom end components are subjected to.
09-10-2013, 05:15 PM
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The valve-train only is expensive and high maintenance:
Christian
09-10-2013, 05:53 PM
#20
The stroke of a GSXR 600 is only around 1.7" which mean a much slower linear speed of the pistons/rods. The LS engine stroke is around 3.6", which is more than double the GSXR, which means more than double the linear speed for the same RPM. Keep in mind each piston and rod must accelerate to full speed and then stop TWICE on every rotation of the engine. That's a lot of stress!