R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric Off-Road

Reply
 
Thread Tools Search this Thread
Old 09-18-2005, 09:50 PM   #1
Tech Initiate
 
Join Date: Aug 2005
Posts: 39
Default What is long stroke / short stroke engine?

Is long stroke engine for on road and short stroke for buggy?
turboburns is offline   Reply With Quote
Old 09-19-2005, 01:53 AM   #2
Tech Rookie
 
Join Date: Dec 2003
Posts: 7
Default

Long stroke is for buggy and monster. Short stroke is for on road. Long stoke gives more bottom end.
frode is offline   Reply With Quote
Old 09-19-2005, 03:37 PM   #3
Tech Regular
 
Sofast-NT's Avatar
 
Join Date: Sep 2004
Location: North Carolina
Posts: 462
Default

Short Stroke-Revs quicker,High RPM's,Top end.

Long Stroke-Lower RPM,More torque,Bottom end.
Sofast-NT is offline   Reply With Quote
Old 09-19-2005, 06:50 PM   #4
Tech Champion
 
Davidka's Avatar
 
Join Date: Oct 2004
Posts: 9,930
Trader Rating: 77 (100%+)
Default

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.
Davidka is offline   Reply With Quote
Old 09-19-2005, 07:59 PM   #5
Tech Master
 
Platinum_Racing's Avatar
 
Join Date: Jun 2005
Location: Rowley MA
Posts: 1,844
Send a message via MSN to Platinum_Racing
Default

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.
Platinum_Racing is offline   Reply With Quote
Old 09-20-2005, 07:25 AM   #6
Tech Elite
 
Join Date: May 2003
Posts: 2,834
Default

Long stroke has a longer rod.
Homer Allman is offline   Reply With Quote
Old 09-20-2005, 08:39 AM   #7
Suspended
 
Join Date: Jul 2003
Posts: 5,108
Trader Rating: 14 (100%+)
Default

Quote:
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.
Phatkat is offline   Reply With Quote
Old 09-20-2005, 08:55 AM   #8
Tech Elite
 
schmelme's Avatar
 
Join Date: Mar 2003
Posts: 2,294
Trader Rating: 13 (100%+)
Default

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.
schmelme is offline   Reply With Quote
Old 09-20-2005, 07:30 PM   #9
Tech Elite
 
arghh's Avatar
 
Join Date: Feb 2005
Location: asean
Posts: 2,583
Default

the bigger the crank shaft, the long stroke it have... is it...???
arghh is offline   Reply With Quote
Old 09-20-2005, 07:44 PM   #10
Tech Master
 
Platinum_Racing's Avatar
 
Join Date: Jun 2005
Location: Rowley MA
Posts: 1,844
Send a message via MSN to Platinum_Racing
Default

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.
Platinum_Racing is offline   Reply With Quote
Old 09-20-2005, 08:31 PM   #11
Tech Elite
 
schmelme's Avatar
 
Join Date: Mar 2003
Posts: 2,294
Trader Rating: 13 (100%+)
Default

Quote:
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.
schmelme is offline   Reply With Quote
Old 09-20-2005, 08:36 PM   #12
Tech Master
 
Platinum_Racing's Avatar
 
Join Date: Jun 2005
Location: Rowley MA
Posts: 1,844
Send a message via MSN to Platinum_Racing
Default

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!
Platinum_Racing is offline   Reply With Quote
Old 09-20-2005, 09:21 PM   #13
Tech Elite
 
arghh's Avatar
 
Join Date: Feb 2005
Location: asean
Posts: 2,583
Default

Quote:
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..??
arghh is offline   Reply With Quote
Old 09-20-2005, 09:29 PM   #14
Tech Master
 
Platinum_Racing's Avatar
 
Join Date: Jun 2005
Location: Rowley MA
Posts: 1,844
Send a message via MSN to Platinum_Racing
Default

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?
Platinum_Racing is offline   Reply With Quote
Old 09-23-2005, 12:07 AM   #15
Tech Initiate
 
Join Date: Aug 2005
Posts: 39
Default

Check the website below. Long stroke used for on-road

http://www.esatclear.ie/~startinggri...ts/engines.htm
turboburns is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
WTB jp-2 or jp-3 Nova long stroke rod. schmelme R/C Items: Wanted to Buy 0 04-10-2007 10:02 PM
Novarossi RR .12 Long Stroke jgraham37128 R/C Items: For Sale/Trade 7 02-01-2007 03:44 PM
Novarossi PLUS-5 .21 long stroke buggy engine. $175.00 shipped rc_freak R/C Items: For Sale/Trade 11 12-06-2006 08:17 PM
JP Modified RX21-R long stroke engine!!! cdelong R/C Items: For Sale/Trade 8 11-20-2004 10:20 AM
Mugen X12 Long Stroke?? TRAJ Onroad Nitro Engine Zone 1 10-03-2004 02:02 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 01:05 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net