A new 2:1 thought, maybe - Honda RC51 Forum : RC51 Motorcycle Forums
 1Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old 09-19-2015, 02:16 PM Thread Starter
Member
 
Join Date: Aug 2010
Location: Minneapolis MN
Posts: 94
Mentioned: 1 Post(s)
Quoted: 12 Post(s)
A new 2:1 thought, maybe

I did some searching but didn't see anything along my lines of thought here. So according to RC51.org the commercially available 2:1 systems have a bad power loss at the middle range. The theory is that the HRC bikes had longer pipes along with WAY more power already on tap. I noticed that all of the 2:1 systems I can find pictures of are right side cans. Wouldn't you get more length if you were to do it just like HRC and run the pipe up, under the seat and to a left side can? I'd imagine that would be good for another foot or so of pipe length.

This is the best picture I can find


I can't be the first person to think of this.
Strider is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 09-19-2015, 03:02 PM
Lifetime Premium
 
Join Date: May 2015
Posts: 106
Mentioned: 1 Post(s)
Quoted: 17 Post(s)
Been done. Hard to find now. https://www.youtube.com/watch?v=Sw5Z86NnUfQ
COBRA90GT likes this.
tarmacslider is offline  
post #3 of 13 (permalink) Old 09-19-2015, 03:11 PM Thread Starter
Member
 
Join Date: Aug 2010
Location: Minneapolis MN
Posts: 94
Mentioned: 1 Post(s)
Quoted: 12 Post(s)
Do we know if there was any dyno tests or anything done? Though I imagine the set up in the video would be about the same as the other commercially available system as its a left exit to left can. The AMA and WSBK bikes had right exit to a left can that would make for more length I would think.
Strider is offline  
 
post #4 of 13 (permalink) Old 09-19-2015, 03:32 PM
Senior Member
 
Join Date: Feb 2013
Location: Greenwich London
Posts: 717
Mentioned: 4 Post(s)
Quoted: 82 Post(s)
Durbahn rc51
dansp1 is offline  
post #5 of 13 (permalink) Old 09-19-2015, 07:07 PM
Senior Member
 
ogiehooker's Avatar
 
Join Date: Dec 2013
Posts: 666
Mentioned: 0 Post(s)
Quoted: 29 Post(s)
Roger Ditchfield was telling me that Colin Edwards used the 2 into 1 for tight tracks..I forgot which race he told me...although he stated that the power was snatchy at 2-3000 rpm and Colin stated that it felt like an engineer who never rode a bike made it...LOL...It was said that the mid range on that bike was increased but the power fell off after 10,5000...exactly OPPOSITE of what everyone says...BUT that was an HRC produced pipe also...who knows what diameter, length, tapers etc were used....Roger had the exact pipe in his garage for 2 years before selling it 4 yrs ago to some guy that was building a Colin Edwards replica bike....

I currently will be trying the jardine Ti that I have ceramic coated on my fully built engine when it returns to the US next week...I am hoping the ceramic coating will keep the exhaust temps higher, thus higher velocity and act like a shorter pipe for top end as the rev limiter is to be set between 11,200 and no higher than 11,6000 by Roger...Roger says he and Mamu Moriwaki both built RC engines and both found that 11:3-11:6 C.R, produced the most HP....Rogers made 163 rwhp and Moriwaki 166 rwhp....R.D. states that all the blownup motors he sees in his shop have been using wiseco pistons..he recommends JE, Pistal, CP...

He says that for the OEM engines that are modified with Hi Comp pistons should not exceed 11,6000 rpm. SORRY RUNON!
Attached Thumbnails
Click image for larger version

Name:	RC51 engine in frame 2015 (1024x768).jpg
Views:	320
Size:	95.4 KB
ID:	94193  
ogiehooker is offline  
post #6 of 13 (permalink) Old 09-19-2015, 09:02 PM Thread Starter
Member
 
Join Date: Aug 2010
Location: Minneapolis MN
Posts: 94
Mentioned: 1 Post(s)
Quoted: 12 Post(s)
Thanks for sharing that awesome collection of information! That is facinating to hear that Colin claims the opposite of what people here have experienced. It would be interesting to go down to his school and ask him what he remembers about everything .
Strider is offline  
post #7 of 13 (permalink) Old 09-19-2015, 09:34 PM
Senior Member
 
ogiehooker's Avatar
 
Join Date: Dec 2013
Posts: 666
Mentioned: 0 Post(s)
Quoted: 29 Post(s)
eshaust

BUT that was an HRC produced pipe also...who knows what diameter, length, tapers etc were used-I'M SURE IT WAS NOTHING LIKE AN AFTERMARKET 2-1.


TKS! Just email or call Roger D.....he can tell you all kinds of stories and info off the top of his head from 30 yrs ago...the guy's has an incredible wealth of knowledge.

Last edited by ogiehooker; 09-19-2015 at 09:37 PM. Reason: sp
ogiehooker is offline  
post #8 of 13 (permalink) Old 09-19-2015, 10:31 PM
Senior Member
 
ogiehooker's Avatar
 
Join Date: Dec 2013
Posts: 666
Mentioned: 0 Post(s)
Quoted: 29 Post(s)
Exhaust flow and temperature? - Forum - F1technical.net

I found this link while researching exhaust temps/velocities....Think our bikes run hot? check out this F1 cars exhaust......awesome sound!
ogiehooker is offline  
post #9 of 13 (permalink) Old 09-19-2015, 11:08 PM Thread Starter
Member
 
Join Date: Aug 2010
Location: Minneapolis MN
Posts: 94
Mentioned: 1 Post(s)
Quoted: 12 Post(s)
True. Based on what I have see no one produces anything like the HRC system. Which I find interesting. It's not like Honda tried to hide what the systems looked like. If it was a total mess to make the customer systems the way they did, why not work on copying the HRC set up?

F1 technical is a great site. Also check out Mulsannes Corner for aerodynamic studies of LMP cars.
Strider is offline  
post #10 of 13 (permalink) Old 09-20-2015, 12:02 AM
Senior Member
 
ogiehooker's Avatar
 
Join Date: Dec 2013
Posts: 666
Mentioned: 0 Post(s)
Quoted: 29 Post(s)
Simon, a vendor here, DOES produce a STREET based HRC 2-1-2 copy....RCDevil and others have them...I think the stig may have a true HRC exhaust.....the street copy has smaller header diameters I believe....

Just got through reading about exhaust gas resonances/intake resonances/rpm resonances on F1 forum....I'm trying to find out how much a set increase in exhaust temperature increases the velocity and by what amount that changes the resonance of the exhaust...Empirical evidence by use of a dyno is the only real measure tha, for me,t will ultimately matter for now.
Attached Thumbnails
Click image for larger version

Name:	VALVE TIMING 001 (1024x765).jpg
Views:	146
Size:	93.1 KB
ID:	94201  

Last edited by ogiehooker; 09-20-2015 at 12:02 AM. Reason: SP
ogiehooker is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda RC51 Forum : RC51 Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 On

 
For the best viewing experience please update your browser to Google Chrome