[600 K5] Rod Bearings gone, Bad lubrication? - Suzuki GSX-R Motorcycle Forums Gixxer.com

 1Likes
  • 1 Post By Karns Performance
 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old 11-11-2015, 03:06 AM Thread Starter
Squid
 
Join Date: Oct 2015
Posts: 8
[600 K5] Rod Bearings gone, Bad lubrication?

Hi Guys, we are using a k5 gsxr 600 engine in our formula sae car. we had some crank issues in the past where the engine started knocking, upon taking it apart we found that it was the rod bearing in cylinder 3 that has gone, and the rod bearing in cylinder 1 started to go.
Now it happened again with a different engine.
We suspect a lubrication issue, since we run high rpm with very little warming time, also we use a dry sump system that we designed ourself (so that maybe an issue as well).
we are using Motul 5100 15w50 oil btw.

Any ideas why it's happening?

some pics:
https://drive.google.com/folderview?...Ws&usp=sharing
shellcase is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old 11-11-2015, 07:03 AM
MotoGP
 
Anthony D's Avatar
 
Join Date: May 2001
Location: Jersey
Motorcycle: Whatever oldgixxer has in his garage...
Posts: 73,190
Garage
Re: [600 K5] Rod Bearings gone, Bad lubrication?

Yup, that is poor oiling. Now, the K4/K5 600/750, and the K3/K4 1000 motors did run into oiling issues when wheelied for an extended period, and it was usually cyl3 that failed. So I am guessing you need to redesign your dry sump system.

Can I ask why you run with little warm up time?

And can I ask what the engine mount configuration is?
Anthony D is offline  
post #3 of 13 (permalink) Old 11-12-2015, 06:54 AM Thread Starter
Squid
 
Join Date: Oct 2015
Posts: 8
Re: [600 K5] Rod Bearings gone, Bad lubrication?

You Can definetly ask
little warmup time is because we try to build the fuel tank as little as possible to save weight - so we just don't have the option to leave the car idle for long, also - the regulations force a restrictor plate on the intake, so the car idles at around 4000 rpm.

about the engine mounts, i'll add a screenshot from the solidworks model.

i do agree that the dry sump needs a redesign, but i understand that you suspect that the engine is mounted in bad angle?
shellcase is offline  
Sponsored Links
Advertisement
 
post #4 of 13 (permalink) Old 11-12-2015, 07:09 AM
MotoGP
 
Anthony D's Avatar
 
Join Date: May 2001
Location: Jersey
Motorcycle: Whatever oldgixxer has in his garage...
Posts: 73,190
Garage
Re: [600 K5] Rod Bearings gone, Bad lubrication?

Yes, that is what I am guessing.

Bad angle + no warmup + 4k rpm idle = lack of oil.
Anthony D is offline  
post #5 of 13 (permalink) Old 11-12-2015, 04:11 PM Thread Starter
Squid
 
Join Date: Oct 2015
Posts: 8
Re: [600 K5] Rod Bearings gone, Bad lubrication?

i added an image, the engine leans forward a little just like in a bike, not sure if more or less.
*still waiting for the chassis design guys to come up with that screenshot.
Attached Images
File Type: jpg 11011475_792047230893432_4742713109065818753_n.jpg (92.5 KB, 37 views)
shellcase is offline  
post #6 of 13 (permalink) Old 11-12-2015, 04:13 PM Thread Starter
Squid
 
Join Date: Oct 2015
Posts: 8
Re: [600 K5] Rod Bearings gone, Bad lubrication?

what's more important for me to understand is why cyl 3 is the 1st to go, and why it seems that cyl1 is the one to follow?
shellcase is offline  
post #7 of 13 (permalink) Old 11-12-2015, 08:53 PM
Lifetime Premium
 
Karns Performance's Avatar
 
Join Date: May 2006
Location: pa
Motorcycle: 05 1k- sold / 2012 1k
Posts: 1,315
Re: [600 K5] Rod Bearings gone, Bad lubrication?

cyl 3 runs a bit hotter and once the brg starts to go the oil pressure isn't contained in the crank shaft cyl 3 becomes a leak. then the rest will follow they are all fed from the main galley. what is your pressure? once the engine is hot at 4 grand you should have 40lbs of oil pressure. above 10-12 grand normaly will be running on bypass (regulator) over 80 lbs.

sounds like your oil system is restricted

jason
oldgixxer likes this.
Karns Performance is offline  
post #8 of 13 (permalink) Old 11-13-2015, 05:39 AM
Guest
 
oldgixxer's Avatar
 
Join Date: Jan 2001
Location: In the garage, smoking one of Anthony D's cigars...
Motorcycle: None, gave them all to Anthony D...
Posts: 24,541
Re: [600 K5] Rod Bearings gone, Bad lubrication?

Good info as always Jason
oldgixxer is offline  
post #9 of 13 (permalink) Old 11-13-2015, 08:11 AM Thread Starter
Squid
 
Join Date: Oct 2015
Posts: 8
Re: [600 K5] Rod Bearings gone, Bad lubrication?

wow guys this is great info!
i will discuss it with my mates and will try to see what we learn from this
Thank You!
shellcase is offline  
post #10 of 13 (permalink) Old 11-19-2015, 08:58 AM Thread Starter
Squid
 
Join Date: Oct 2015
Posts: 8
Re: [600 K5] Rod Bearings gone, Bad lubrication?

Here's the model screenshot, we use the stock mounting points.
Attached Images
File Type: jpg Capture.jpg (45.9 KB, 25 views)
shellcase is offline  
post #11 of 13 (permalink) Old 11-19-2015, 09:00 AM
MotoGP
 
Anthony D's Avatar
 
Join Date: May 2001
Location: Jersey
Motorcycle: Whatever oldgixxer has in his garage...
Posts: 73,190
Garage
Re: [600 K5] Rod Bearings gone, Bad lubrication?

Ok, so then do what Jason suggested and check out your oil pressure across the RPM range.
Anthony D is offline  
post #12 of 13 (permalink) Old 11-22-2015, 04:12 PM Thread Starter
Squid
 
Join Date: Oct 2015
Posts: 8
Re: [600 K5] Rod Bearings gone, Bad lubrication?

will do!
i will definitely keep you guys posted!

By the way, is there a reason that cyl 3 runs hotter the the others?
is it a design flow?
shellcase is offline  
post #13 of 13 (permalink) Old 11-22-2015, 07:53 PM
Provisional Novice
 
TurboBlew's Avatar
 
Join Date: Jan 2003
Location: FL
Motorcycle: Do the letters G S X R mean anything??
Posts: 145
Re: [600 K5] Rod Bearings gone, Bad lubrication?

One thing to check closely is the oil pickup. Do you burn through clutches on this setup?
TurboBlew is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Suzuki GSX-R Motorcycle Forums Gixxer.com 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