455 Stroker Motor Build
Registered User
Joined: Feb 2008
Posts: 2,662
From: Jacksonville, FL
but I have not seen how to calculate piston speeds at different degrees of crank rotation.
It talks about where and when maximum piston speed is achieved and why.
It also points out what the difference is between this and 'Mean Piston Speed',
which is the formula you referred to earlier.
Neat stuff.
On the previous page it explains how long/short rods alter speed.
http://www.epi-eng.com/piston_engine...celeration.htm
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Joined: Jan 2008
Posts: 59
From: Paulding ohio
How did you figure out it would be traveling faster at 90 and 270 degrees.
Registered User
Joined: Feb 2008
Posts: 2,662
From: Jacksonville, FL
How did you figure out it would be traveling faster at 90 and 270 degrees.
http://www.epi-eng.com/piston_engine...celeration.htm
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Joined: Jan 2008
Posts: 59
From: Paulding ohio
sorry I didn't know we were on the second page when I posted my other question.
Junior Member
Joined: Oct 2004
Posts: 2,212
From: Southern CA
Good stuff.
But,
maximum velocities would occur slightly before 90° and after 270°.
Norm
Originally Posted by www.epi-eng.com
In fact, the effective length of the rod at any point is the actual rod length multiplied by the cosine of the angle between the rod and the cylinder centerline.
Norm
Registered User
Joined: Feb 2008
Posts: 2,662
From: Jacksonville, FL
maximum velocities would occur slightly before 90° and after 270°.
I actually feel smarter having read it.
Tried to explain to my girlfriend why I was so immersed in the topic
and how a long rod engine converts to different piston velocities
over a shorter rod engine and...long story short- she's not nearly impressed.
Last edited by Rallye469; Apr 17, 2008 at 05:33 PM.
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Joined: Dec 2007
Posts: 440
From: Lincoln Park, Michigan.
If your using the stock 425 rods and a stock 455 crank your not really making a stroker motor. The only way to make a stroker motor is to increase the stroke at the crank, if you use this setup all your doing is moving the piston closer to the head and increasing compression ratio.
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Joined: May 2008
Posts: 1
angle determines speed
I will agree with you to a certain point. As the crank pushes the piston toward the head on a long rod the piston will stop for a very brief moment, then the crank has to bring the rod back around to take the piston back down the cylinder. On the long long rod the piston will be at tdc longer and bdc longer than the short rod simply because it takes the crank longer to swing the long rod vs. the short rod. I believe the physical speed of either one is still the same though. It's not the speed of the piston it's the speed of the cycle. The long rod does push the piston higher therefore speeding up the cylcle.
I hope I got that right... logically it seems so to me. Its one of the major primary differences to a bourke engine.
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