Go Back   DIY Go Kart Forum > Building Plans And Advice > Engines & Clutches

Notices

Closed Thread
 
Thread Tools Display Modes
  #101  
Old 01-26-2015, 06:58 PM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default

You should try being a stand up comedian Doug!
You come up with some funny stuff!
  #102  
Old 01-26-2015, 07:12 PM
itsid's Avatar
itsid itsid is online now
Moderator
 
Join Date: Jul 2013
Location: Ruhrpott [Germany]
Posts: 10,722
Thanks: 1,448
Thanked 4,480 Times in 3,377 Posts
Default

Quote:
Originally Posted by Desertduler View Post
I think that I am just going to do what has worked for me in the past and leave it at that.
No use messing up a good thing and I want to keep it that way.
I am done with all my blending of the liner and I will give the engine a test soon.
hehe, that's a pity.. When I saw your pics, I thought it'd be interesting to know if that would be beneficial;

and let's be honest, I can't calc that in my head, neither can I build or modify an engine like you could to test that theory..
and I doubt (although I haven't checked) I could afford the software to let my computer do the calculations.

But I totally understand that you're not exactly eager to ruin a perfectly good crankcase just to please my curiosity
(In fact you shouldn't...)

That's why I carefully picked my words "Have you ever played with the idea... "
If you had, maybe even tried that I would love to know the results..
since you haven't, I'm okay with that too

Oh.. as always.. let us know how it turned out please.

'sid

PS yes.. that was a weird example of fluidal movement I admit.. but it's a good picture to explain that all..

more cattle..people.. yes, that's what a physicist would call pressure
__________________
Jokes about german sausage are the wurst.
  #103  
Old 01-27-2015, 12:18 PM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default

Here are the dimensions and port timing that I am using on my reed valved engine along with the weights in grams of my modified piston and a stock one with no wrist pins installed. The windows in the piston are .625 wide. I have posted this information here because there are some people that are interested in this modification in relation to this engine model.
Attached Thumbnails
p1.jpg   p2.jpg  

p3.jpg   p6.jpg  

p4.jpg   p5.jpg  

  #104  
Old 01-27-2015, 12:32 PM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default

And if someone has a balance problem with the twenty and change gram weight difference I have a solution other than rebalancing the crank if need be.
  #105  
Old 01-27-2015, 06:46 PM
yanbolduc yanbolduc is offline
Junior Member
 
Join Date: Jan 2015
Location: Thetford Mines, Quebec, Canada
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Yes, I'm curious to know how not to rebalance everything when I'll do this mod.
  #106  
Old 01-27-2015, 07:15 PM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default

Quote:
Originally Posted by yanbolduc View Post
Yes, I'm curious to know how not to rebalance everything when I'll do this mod.
Well my engine vibrates less than it did before and that may not be the case will everyone of them,I am done messing with mine and I am happy as all get out! you cannot balance a single cylinder engine perfectly you can just shift where it does vibrate and mine is smooth at high RPM but if you need my help I will show you how to just let me know.The thing is how much does a OEM piston weigh compared to an aftermarket one? and how much do they vary in weight? weigh a bunch of pistons with the rings,clips,and wrist pin and you can see what I mean the aftermarket companies vary a lot more than an Elko or Mahle pistons do.
  #107  
Old 01-27-2015, 08:27 PM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default

Well I just took my kart for a little night ride and I drove it up a hill in order to get the expansion chamber up to temp so that it would pull the intake charge through the reed valves and the thing is faster going up hill than it used to be on the flat! and it is pulling more RPM than it ever has! and I never altered the exhaust or transfer port timing.I am not going to do anything more to this engine but run the crap out of it on the lakebed this year so we will see how it holds up as I will tear it down and inspect it next winter if it doesn't blow up!
  #108  
Old 01-27-2015, 08:31 PM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default

I have a video that I will post,just remember that I am going up hill.
The Following User Says Thank You to Desertduler For This Useful Post:
itsid (01-27-2015)
  #109  
Old 01-27-2015, 09:59 PM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default

I saw my tachometer reading in the street lights as I passed by and lets see if someone can give me an idea how fast I was going up hill with 6 to 1 drive ratio and 15 inch tall tires when the video uploads.The funny thing is most cases a reed valve will kill the upper RPM level compared to an unrestricted intake path of a piston ported engine because of the disturbance of flow that a reed valve cage creates and there is some pumping forces of the increased crankcase pressure that normally kills the upper RPM slightly but now we have a supercharging effect that if the pipe is made correctly will indeed make more power in the upper RPM levels and make up for the pumping resistance.
Remember when I pointed out the widows in the piston open during the exhaust cycle?
That is when the pipe will indeed pull the charge through the reeds when the pipe is up to temp and creates this effect,I will point this out in the video and one can hear and see the power come up or what is known as "on the pipe" and most reed valved engines have Boyesen ports and or case reed induction and they will pull the charge from there.
  #110  
Old 01-27-2015, 10:10 PM
itsid's Avatar
itsid itsid is online now
Moderator
 
Join Date: Jul 2013
Location: Ruhrpott [Germany]
Posts: 10,722
Thanks: 1,448
Thanked 4,480 Times in 3,377 Posts
Default

uh guessing time...

hmmm okay, I'll try to make a guess...

I'd say you hit around 6200 rpm uphill (uphill... downhill, I don't think that's even a point with what I assume to be around 35 HP now)
maybe a tad more..
15" wheels 6:1 ratio.. so I'll shoot for maybe 75km/h (~46 mph)
No wait.. pipe.. "supercharging effect"... 6500 rpm?
80 km/h (50'ish mph)?

more??

I don't know.. I have absolutely no idea.. so yeah that's just a wild guess...

'sid
__________________
Jokes about german sausage are the wurst.
  #111  
Old 01-27-2015, 10:29 PM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default

Quote:
Originally Posted by itsid View Post
uh guessing time...

hmmm okay, I'll try to make a guess...

I'd say you hit around 6200 rpm uphill (uphill... downhill, I don't think that's even a point with what I assume to be around 35 HP now)
maybe a tad more..
15" wheels 6:1 ratio.. so I'll shoot for maybe 75km/h (~46 mph)
No wait.. pipe.. "supercharging effect"... 6500 rpm?
80 km/h (50'ish mph)?

more??

I don't know.. I have absolutely no idea.. so yeah that's just a wild guess...

'sid
How about 8925 RPM, Think I am kidding?
  #112  
Old 01-27-2015, 10:32 PM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default

Remember how I said I never show all the cards in my hand?
  #113  
Old 01-27-2015, 10:34 PM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default

You will see the video then you tell me if it looks like I am going 46 mph.
  #114  
Old 01-28-2015, 12:10 AM
itsid's Avatar
itsid itsid is online now
Moderator
 
Join Date: Jul 2013
Location: Ruhrpott [Germany]
Posts: 10,722
Thanks: 1,448
Thanked 4,480 Times in 3,377 Posts
Default

Quote:
Originally Posted by Desertduler View Post
How about 8925 RPM, Think I am kidding?
okay this is a family friendly forum.. so

just picture me smashing my keyboard with my yaw..
eyes opened far enough to lit my brain tissue,
drooling slightly (again?.. I should see a doctor one day..)

saying this <with some embedded 'F'-Words>

9k.. that is totally amazing,
far beyond my expectations..
and not only IMPRESSIVE as H377 but also
brutally intimidating!
That's what? -- a 45% increase in rpm..


I am ashamed I even tried to make a guess now

for your work, I just said to Kelly I'd love to know half of what you know about engines..
right now I think, I'd be more than happy with 27%

'sid
__________________
Jokes about german sausage are the wurst.
  #115  
Old 01-28-2015, 12:18 AM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default


This video is still being edited and shortened so watch it and one can see and hear as I go up the hill the engine RPM increases even going uphill as the pipe heats up and that is when the sound waves travel faster in the heated pipe and the pipe pulls the intake charge through the reeds it happens right before I come to the last street light pulling the hill and as I pass by the street light the tachometer reads 8925 RPM,I needed put the kart under a load in order to get the pipe to heat up enough because I am about one step rich on the main jet.This thing goes faster up a grade now than it did on the flat and I still have to take it out to the lake bed and test it out there.Ok so the pipe heats in at 3:53 and at 3:55 the engine is turning 8925.
The Following User Says Thank You to Desertduler For This Useful Post:
rmm727 (01-28-2015)
  #116  
Old 01-28-2015, 12:33 AM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default

No more light switch powerband.
  #117  
Old 01-28-2015, 12:37 AM
itsid's Avatar
itsid itsid is online now
Moderator
 
Join Date: Jul 2013
Location: Ruhrpott [Germany]
Posts: 10,722
Thanks: 1,448
Thanked 4,480 Times in 3,377 Posts
Default

again

'sid
__________________
Jokes about german sausage are the wurst.
  #118  
Old 01-28-2015, 12:39 AM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default

Quote:
Originally Posted by itsid View Post
again

'sid
  #119  
Old 01-29-2015, 07:14 AM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default

I am working on a "Gen 2" cylinder now and I will install it on a second engine that I have and see how I like the change. I did not alter the stock port timing on my current cylinder that I am running but I have added some other ports that augment the stock porting hence the end results.
  #120  
Old 02-02-2015, 11:16 AM
Desertduler Desertduler is offline
Senior Member
 
Join Date: Mar 2013
Posts: 1,735
Thanks: 469
Thanked 668 Times in 414 Posts
Default

I had this engine turning 9130 on a flat asphalt road yesterday and my GPS was registering 67 mph that is fast enough to get killed real quick, I am putting some new tires on and I will be heading out to the lake bed this up coming weekend and give this engine a test out there and see how well this engine pulls down low coming out of the corners compared than before I modified it.
The Following User Says Thank You to Desertduler For This Useful Post:
itsid (02-03-2015)
Closed Thread

Thread Tools
Display Modes

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



All times are GMT -6. The time now is 12:06 AM.