Franken-engine.

Old 10-26-2014, 04:25 PM
  #1  
Tech Adept
Thread Starter
 
Join Date: Jul 2014
Posts: 239
Default Franken-engine.

Has anyone tried taking the best parts of different motors and building one excellent motor?

What would you use and why? Can it be done? Id like something that makes smooth power and revs all day long. Decent mileage but not overly concerned with that. What could be built out of cheap ass parts off ebay? Case, head, bearings, crank, p/s and carb. Or is there enough decent .21s that would should be able to find something to your liking without resorting to building your own?
bksrt is offline  
Old 10-26-2014, 04:53 PM
  #2  
Tech Lord
iTrader: (52)
 
Jaz240's Avatar
 
Join Date: Aug 2008
Location: Dwindle city
Posts: 12,494
Trader Rating: 52 (100%+)
Default

Engine parts are mostly specific to that engine. You can't just throw random engine parts together and have it work properly.
Jaz240 is offline  
Old 10-26-2014, 05:14 PM
  #3  
Tech Elite
iTrader: (36)
 
Jerm13's Avatar
 
Join Date: Feb 2010
Location: VB, VA
Posts: 3,240
Trader Rating: 36 (100%+)
Default

Originally Posted by bksrt View Post
Has anyone tried taking the best parts of different motors and building one excellent motor?

What would you use and why? Can it be done? Id like something that makes smooth power and revs all day long. Decent mileage but not overly concerned with that. What could be built out of cheap ass parts off ebay? Case, head, bearings, crank, p/s and carb. Or is there enough decent .21s that would should be able to find something to your liking without resorting to building your own?
You would have to do a lot of measuring to make sure it fits.

Crank for instance. You have the OD of the flute, where the bearings fit, the crank pin, the throw of the crank.

Rod, Both bearing ID's, length, interfearance during the stroke.

Piston/ sleeve, do the ports line up with the case, skirt clearance, rod clearance, compression.

Its a pretty long and in depth list.

I think the most widely used and better engines was the Ninja/OS B01.
Jerm13 is offline  
Old 10-26-2014, 07:16 PM
  #4  
Tech Lord
iTrader: (148)
 
Frank L's Avatar
 
Join Date: Dec 2008
Location: NorCal
Posts: 12,522
Trader Rating: 148 (100%+)
Default

A buddy put a JQ p/s/r into a XZ speed and it runs pretty good but mileage is sub what I would want to see and power is about the same. Better to stick with what's suppose to be in there and not touch it. These mills are run through a cnc machine to very high completely reproducible tolerances for all parts take a peek at the orion video that was released a while back. The JQ parts in a xz speed engine are almost the same thing, yet the result was less than desired.
Frank L is offline  
Old 10-27-2014, 12:58 AM
  #5  
Tech Champion
 
Roelof's Avatar
 
Join Date: Aug 2007
Location: Holland
Posts: 9,269
Default

I have done this some times but it was only with used parts to see how much work it is and how the results will be. It was all about of setting up a cheap engine for some practise
Indeed you have to know the timings and measure the new setup if it is right.

They have run well:
http://www.euronet.nl/users/tooms/evo5/modmotor.htm

But it is better to learn more about timings and how to change them....
Roelof is online now  
Old 10-27-2014, 04:21 AM
  #6  
Tech Master
 
Join Date: Jan 2010
Posts: 1,624
Default

Originally Posted by Roelof View Post
I have done this some times but it was only with used parts to see how much work it is and how the results will be. It was all about of setting up a cheap engine for some practise
Indeed you have to know the timings and measure the new setup if it is right.

They have run well:
http://www.euronet.nl/users/tooms/evo5/modmotor.htm

But it is better to learn more about timings and how to change them....
Roelof, can you explain the theory behind the grooves in the head button?
Eivind E is offline  
Old 10-27-2014, 02:32 PM
  #7  
Tech Champion
 
Roelof's Avatar
 
Join Date: Aug 2007
Location: Holland
Posts: 9,269
Default

Search on "Singh grooves" and you will find the guy behind it.

After the combustion a little bit of flow is sended to the squish band through these channels and the rest will follow when the piston goes down from TDC. Normally you have a brown spot in the middle of the piston and with these grooves it is wider spread so the power of the combustion is wider spread over the surface of the piston.

On larger engines it does give more midrange power and a better milage. The midrange power I have noticed when shifting into 2nd gear but the milage not. A friend running large scales did also try it and he did notice a better milage.
Roelof is online now  
Old 10-27-2014, 03:08 PM
  #8  
Tech Master
 
Join Date: Jan 2010
Posts: 1,624
Default

I remember reading an engine mod thread on here where there was some info on it, Roelof, do you remember it?
Eivind E is offline  
Old 10-27-2014, 04:57 PM
  #9  
Tech Champion
 
Roelof's Avatar
 
Join Date: Aug 2007
Location: Holland
Posts: 9,269
Default

http://www.rctech.net/forum/onroad-n...d-engines.html
Roelof is online now  
Old 11-19-2014, 03:30 AM
  #10  
Suspended
iTrader: (2)
 
Join Date: Jan 2008
Posts: 1,450
Trader Rating: 2 (100%+)
Default

Knowing what i know (or think i do) all that does is lower the compression ratio of the engine because the combustion chamber is now bigger. Decreasing its size is a standard practice in gasoline engines for dramatically increasing power.
mtpocketsracing is offline  
Old 11-19-2014, 11:28 AM
  #11  
Tech Master
 
nitroexpress's Avatar
 
Join Date: Sep 2006
Posts: 1,919
Default

Originally Posted by Eivind E View Post
I remember reading an engine mod thread on here where there was some info on it, Roelof, do you remember it?
http://www.rctech.net/forum/offroad-...-button-2.html
nitroexpress is offline  

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.