R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road > Offroad Nitro Engine Forum

Like Tree4Likes
Reply
 
Thread Tools Search this Thread
Old 07-05-2017, 02:19 PM   #1
Tech Fanatic
 
Adamska27's Avatar
 
Join Date: Apr 2012
Location: The land of cheese and beer
Posts: 769
Trader Rating: 2 (100%+)
Default Bore = Stroke?

So, the new novarossi engine looks sweet.

Um, so why do I care if the bore = stroke? Volumetric efficency of sorts??

Someone make me less dumb please
Adamska27 is offline   Reply With Quote
Old 07-05-2017, 03:33 PM   #2
8T
Tech Adept
 
8T's Avatar
 
Join Date: Feb 2008
Location: Valley Village, Ca
Posts: 120
Default

Long stroke motors are a bit more temperamental about a tuning window. Square stroke motors tend to have a larger tuning window, and are less finicky. There are other reasons, long stroke = more torque, but tuning is what im more concerned with.
8T is offline   Reply With Quote
Old 07-06-2017, 01:28 AM   #3
Tech Champion
 
Roelof's Avatar
 
Join Date: Aug 2007
Location: Holland
Posts: 6,277
Send a message via ICQ to Roelof
Default

There is no way to tell the behavour of an engine. All engines you can compare are all different timed, have different needles in the carb and could have different materials.

On the track all differennt strokes can perform the same.
slashracer111 likes this.
__________________
The quality of an answer comes with the quality of the question.
Roelof is online now   Reply With Quote
Old 07-09-2017, 01:57 PM   #4
Tech Regular
 
slashracer111's Avatar
 
Join Date: Feb 2010
Location: Cullman, AL
Posts: 486
Trader Rating: 25 (100%+)
Default

Quote:
Originally Posted by Roelof View Post
There is no way to tell the behavour of an engine. All engines you can compare are all different timed, have different needles in the carb and could have different materials.

On the track all differennt strokes can perform the same.
+1.

The best way you can learn the specific in and outs about an engine is to buy one. Even two of the same engines broken in by the same person have the possiblity of being very different on the track.
__________________
Hunter Cupp
Be the first, and you'll win -Kimi Räikkönen
HB Racing - JConcepts - Team Orion - Nitro Pro Fuel - RC Addiction Products - Absolute Hobbyz
slashracer111 is offline   Reply With Quote
Old 07-10-2017, 10:09 AM   #5
Tech Fanatic
 
Adamska27's Avatar
 
Join Date: Apr 2012
Location: The land of cheese and beer
Posts: 769
Trader Rating: 2 (100%+)
Default

So I do understand that you don't really know until you try.....
And yes, different carbs do different stuff.....

But why is bore = stroke a desirable thing that I might want????
Adamska27 is offline   Reply With Quote
Old 07-10-2017, 10:23 AM   #6
Tech Elite
 
JatoTheRipper's Avatar
 
Join Date: Sep 2007
Location: PA
Posts: 2,399
Trader Rating: 8 (100%+)
Default

Quote:
Originally Posted by 8T View Post
Llong stroke = more torque
That's a myth.

Quote:
Originally Posted by Adamska27 View Post
So I do understand that you don't really know until you try.....
And yes, different carbs do different stuff.....

But why is bore = stroke a desirable thing that I might want????
Every engine configuration has pros and cons. Novarossi is telling you a square motor is desirable because that's what their marketing wants you to believe.
__________________
Leaf Spring Mafia - Member #1
https://www.shapeways.com/shops/leafspringmafia
https://www.facebook.com/LeafSpringMafia
https://www.instagram.com/LeafSpringMafia
JatoTheRipper is offline   Reply With Quote
Old 07-10-2017, 01:15 PM   #7
Tech Champion
 
Roelof's Avatar
 
Join Date: Aug 2007
Location: Holland
Posts: 6,277
Send a message via ICQ to Roelof
Default

A change because they have to make changes.... Otherwise we "stupid" consumers will not buy new motors.

Beside that, within Novarossi there are more brands (internal and external) and the different dimensions are splitted to keep the aftersales also with that brand.
__________________
The quality of an answer comes with the quality of the question.
Roelof is online now   Reply With Quote
Old 07-10-2017, 02:18 PM   #8
Tech Elite
 
kgombe's Avatar
R/C Tech Elite Subscriber
 
Join Date: Aug 2008
Posts: 3,181
Trader Rating: 11 (100%+)
Default

the only possible advantage i can see is the break period will be relatively shorter
__________________
Kijana Crichton
kgombe is offline   Reply With Quote
Old 07-10-2017, 02:19 PM   #9
Tech Elite
 
JatoTheRipper's Avatar
 
Join Date: Sep 2007
Location: PA
Posts: 2,399
Trader Rating: 8 (100%+)
Default

Quote:
Originally Posted by kgombe View Post
the only possible advantage i can see is the break period will be relatively shorter
What makes you say that?
__________________
Leaf Spring Mafia - Member #1
https://www.shapeways.com/shops/leafspringmafia
https://www.facebook.com/LeafSpringMafia
https://www.instagram.com/LeafSpringMafia
JatoTheRipper is offline   Reply With Quote
Old 07-10-2017, 02:24 PM   #10
Tech Elite
 
kgombe's Avatar
R/C Tech Elite Subscriber
 
Join Date: Aug 2008
Posts: 3,181
Trader Rating: 11 (100%+)
Default

Shorter stroke = less travel through the mechanical pinch.
__________________
Kijana Crichton
kgombe is offline   Reply With Quote
Old 07-10-2017, 03:30 PM   #11
Tech Regular
 
timjs's Avatar
 
Join Date: Jun 2015
Posts: 365
Default

Quote:
Originally Posted by kgombe View Post
Shorter stroke = less travel through the mechanical pinch.
So what? It's still an engine revolution.
Anywho,
the square thing is just marketing wank, as stated. There's nothing novel here, these manufacturers just make some little changes here and there and make it out to be a big deal. Which they have to, to make sales.
These engines have like three moving parts...they are so simple there's no magic benefit to a 1:1 bore/stroke. It's just another little specification they can change to make this engine different then another.
No one is going to be changing the game until someone figures out a realistic EFI to do away with the carbs.
timjs is offline   Reply With Quote
Old 07-10-2017, 03:39 PM   #12
Tech Elite
 
kgombe's Avatar
R/C Tech Elite Subscriber
 
Join Date: Aug 2008
Posts: 3,181
Trader Rating: 11 (100%+)
Default

Are you one of those guys that has to quote someone to flex you keyboard skills...

Anywho I based my comment on engines I've ran from the past and present, the VZB was easier to break in than the XZB the only mechanical difference was the bore stroke.

The Ws7 from rb was easier to break in than it's life g stroke variance the C6... i never onc said performance of some sort would be better or worst...


It is marketing, of course.
__________________
Kijana Crichton
kgombe is offline   Reply With Quote
Old 07-10-2017, 03:46 PM   #13
Tech Regular
 
timjs's Avatar
 
Join Date: Jun 2015
Posts: 365
Default

Quote:
Originally Posted by kgombe View Post
Are you one of those guys that has to quote someone to flex you keyboard skills...

Anywho I based my comment on engines I've ran from the past and present, the VZB was easier to break in than the XZB the only mechanical difference was the bore stroke.

The Ws7 from rb was easier to break in than it's life g stroke variance the C6... i never onc said performance of some sort would be better or worst...


It is marketing, of course.
I wasnt attacking you, man. My mistake if it came off that way. The majority of my post was just my opinion on the square bit.
As for breakin, I believe "ease" of break-in relies more on the actual amount of interferance present at the beginning. The tolerances of manufacturing can vary a lot. One engine could be fairly loose, another identical engine might need to be preheated to even be able to make it through the pinch.
If tolerances were not a problem, there would be no break-in at all because the engines would be manufactured to exactly the correct clearances from the factory.
Again no attack, just conversing.
kgombe and stanleyw808 like this.
timjs is offline   Reply With Quote
Old 07-10-2017, 03:51 PM   #14
Tech Elite
 
kgombe's Avatar
R/C Tech Elite Subscriber
 
Join Date: Aug 2008
Posts: 3,181
Trader Rating: 11 (100%+)
Default

This is why I compared engines of same brand or manufacturer and also personal experience, I would think that the tolerance and materials used to be the same..


Just an opinion made on experience..
__________________
Kijana Crichton
kgombe is offline   Reply With Quote
Old 07-10-2017, 03:53 PM   #15
Tech Champion
 
Roelof's Avatar
 
Join Date: Aug 2007
Location: Holland
Posts: 6,277
Send a message via ICQ to Roelof
Default

Quote:
Originally Posted by kgombe View Post
Shorter stroke = less travel through the mechanical pinch.
Engine knowledge all the way!!!! NOT!

Due tolerances the pinch of a normal Novarossi can start at 5 up to 7mm from the upper edge. With a square stroke it is nothing different.... A square stroke is just 0.4mm shorter than the normal long stroke, over the pinch zone in your thoughts it will only differ 0.2 mm or less.

And square stroke new? 15 years ago the square stroke RB WS7 was a winner. Even the WS7-II was a winner between all longer stroke models.
__________________
The quality of an answer comes with the quality of the question.
Roelof is online now   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Losi 1/10 TEN-SCTE ARR 4x4 Short Course Truck Thread SaladFork Electric Off-Road 46486 11-21-2017 09:29 PM
The Big Locked Thread donitaROSE Manila Racers 89718 03-26-2015 08:17 AM
Understanding bore and stroke Alexnailey692 Offroad Nitro Engine Forum 12 06-03-2013 05:33 AM
R/C Stuff Selling Kenneth Tan Singapore R/C Racers 45728 09-09-2009 08:19 AM
Bore vs Stroke vs Displacement rmdhawaii Onroad Nitro Engine Zone 163 11-07-2006 01:07 PM



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 08:59 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