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What is long stroke / short stroke engine?

What is long stroke / short stroke engine?

Old 09-18-2005, 08:50 PM
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Default What is long stroke / short stroke engine?

Is long stroke engine for on road and short stroke for buggy?
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Old 09-19-2005, 12:53 AM
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Long stroke is for buggy and monster. Short stroke is for on road. Long stoke gives more bottom end.
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Old 09-19-2005, 02:37 PM
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Short Stroke-Revs quicker,High RPM's,Top end.

Long Stroke-Lower RPM,More torque,Bottom end.
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Old 09-19-2005, 05:50 PM
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Actually, long stroke gives more overall power and RPM. Different rules for these little nitro engines. A long stroke engine allows for longer open port duration, the piston passing up and down is what open and closes the ports.
A "short stroke engine is usually slightly lower in overall power but has a broader usable spread of power so they're easier to drive.
Good example is the RB engines. The S5 and S7II are short stroke engines that are known for good power and smoothness. The C5 is a long stroke and is known to be brutally powerfull. Most people who try them end up selling them because they are too much to handle.
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Old 09-19-2005, 06:59 PM
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Most times in a 4 cycle a longer storke equals more torque. My 5.9L I6 Cummins Turbo Diesel puts out 460 ft/lbs of torque, but it redlines at around 4,000.

Power in terms of HP actually goes down with lower RPM's, which is why my truck doesn't put out much HP.

HP is Torque X RPM / 5252. So the lower the revs the less respective HP an engine will get. Peak HP and max HP are also different. Peak HP is the most efficient HP the engine will develop. This generaly occurs at or around the engines maximum torque. Maximum HP generally is developed later in the RPM band, because that is how HP is actually rated.
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Old 09-20-2005, 06:25 AM
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Long stroke has a longer rod.
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Old 09-20-2005, 07:39 AM
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Originally Posted by Homer Allman
Long stroke has a longer rod.

Not really. Stroke length is determined by the position of the rod journal in relation to crank centerline.
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Old 09-20-2005, 07:55 AM
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Some long stroke engines do use a longer rod. This is so the side to side cant of the rod during its stroke isnt as extreme.
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Old 09-20-2005, 06:30 PM
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the bigger the crank shaft, the long stroke it have... is it...???
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Old 09-20-2005, 06:44 PM
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The longer the distance from the center of the crank to the bottom hole of the connecting rod the longer the stroke. Several other factor's such as connecting rod length and piston crown height also change the stroke.
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Old 09-20-2005, 07:31 PM
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Originally Posted by Platinum_Racing
The longer the distance from the center of the crank to the bottom hole of the connecting rod the longer the stroke. Several other factor's such as connecting rod length and piston crown height also change the stroke.
This isnt all true. The only thing that can change the stroke of an engine is the crank. Stroke is the distance the piston moves from BDC to TDC by installing diff rod or piston it still moves the same distance just changes compression ratios or piston relation to port windows.
Argh: it isnt the size of the crank it is the relationship of the rod pin on the crank to the center line of the crankshaft. The farther the pin is from center equals more stroke.
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Old 09-20-2005, 07:36 PM
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My God...your right!

The piston would go up furthur with a longer con rod, but BDC would also be higher in the sleeve.

Looks like you've foiled my plans to make sure no one in this thread could hold an intelligent conversation! BAHHHH!
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Old 09-20-2005, 08:21 PM
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Originally Posted by schmelme
Argh: it isnt the size of the crank it is the relationship of the rod pin on the crank to the center line of the crankshaft. The farther the pin is from center equals more stroke.
yess you sure got the point.. but still when bigger crank diametre, it will increase the distance of rod pin/crank centerline and automatically increase the stroke distance...

the short stroke produce more rpm, more top speed, but less bottom, always for onroad use, not last longer
the long stroke always got less rpm, less top speed but more bottom end and is great for offroad, will last longer... am i true..??
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Old 09-20-2005, 08:29 PM
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What he's saying is when you have a larger crank (think counter weight to center in a .21 as opposed to a .15) it's only logical that the crank "Journal" be further from the centerline as well. It's just a matter of scaling the crank, is this what your trying to say?
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Old 09-22-2005, 11:07 PM
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Check the website below. Long stroke used for on-road

http://www.esatclear.ie/~startinggri...ts/engines.htm
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