The new Piranha, Joost Kolken, Holland

Re: The new Piranha, Joost Kolken, Holland

Postby Jet » Tue Jul 05, 2011 5:02 pm

HUGE effort with the pipe, VERY nice work!!!!
<a href="http://www.digrite.com.au/racing#!digrite-racing/c23vw">Check out the latest video and Pictures from Digrite Racing</a>
User avatar
Jet
Barracuda
 
Posts: 3798
Joined: Mon Apr 30, 2007 12:11 am
Location: Perth WA

Re: The new Piranha, Joost Kolken, Holland

Postby joost » Thu Jul 07, 2011 6:01 am

Thanks guys!

I'am looking for a new oil cooler.
But wich size do i need and how many rows?
User avatar
joost
Trax II
 
Posts: 204
Joined: Sat Dec 13, 2008 2:03 am
Location: Holland

Re: The new Piranha, Joost Kolken, Holland

Postby Rayatswan » Thu Jul 07, 2011 1:11 pm

Hi Joost, I have really enjoyed your build thread and think you are doing a great job. I especially like your "Russell" double A arm front set up with modifications. When I built my font A arms I toyed with the idea of modifying my top arm similar to yours but I got it into my head that the top arm with the rear mount in a position like yours would sweep thru a different arc than the bottom arm and this would progressively effect caster as the suspension compresses and i couldn't think of anyway to remedy this. Can anyone explain to me why I was wrong as Joost says he has no bumpsteer issues or any other problems, perhaps a good question for Tony,
Thanks....... Ray
Rayatswan
Fun Kart
 
Posts: 141
Joined: Wed Oct 29, 2008 6:47 am
Location: Swan Bay, NSW, Australia

Re: The new Piranha, Joost Kolken, Holland

Postby Tony » Thu Jul 07, 2011 9:36 pm

The Barracuda has zero bumpsteer if built to the plans.
Effectivly this double A arm Piranha front is a version of the Barracuda front suspension.
Just adapted to suit the Piranha.
Yes the Barracuda does have progressive Caster with wheel movement.
Not a lot, but its there.
With the upraked nose a buggy will tend to dive a little on front brakes.
This compresses the front suspension & because of the nose down dive, Caster is reduced.
Hense the progressive Caster to maintain good steering during hard braking.
Or at least try & counter the negative effects of losing Caster during front braking.
"There can't be a practical reason for believing in what isn't true" – Sir Bertrand Russell.
User avatar
Tony
Administrator
 
Posts: 5861
Joined: Mon Feb 27, 2006 11:07 am
Location: Perth, Western Australia

Re: The new Piranha, Joost Kolken, Holland

Postby Rayatswan » Fri Jul 08, 2011 10:30 am

I never thought about the nose of the buggy diving under brakes, that certainly explained things well, thanks Tony. How much progressive caster is acceptable and how much is too much. I suppose a lot depends on how much dive the buggy goes thru on braking.
Rayatswan
Fun Kart
 
Posts: 141
Joined: Wed Oct 29, 2008 6:47 am
Location: Swan Bay, NSW, Australia

Re: The new Piranha, Joost Kolken, Holland

Postby Tony » Fri Jul 08, 2011 12:16 pm

Yes, Dive is relative to shock stiffness, the location of the vehicles weight, front traction, terrain type, speed & how much braking force you can apply before the wheels lock up.
Most of it is to do with shock stiffness.
I would not think you would want more than around 3 to 4 degrees of progressive Caster.
Street cars do the exact opposite.
They angle the top arm with the forward arm mount lower.
This creates an "anti dive" geometry.
Most street cars are front engine & they get too much front weight transfer under brakes, so thats the idea of Anti Dive.
For a Rear/Mid engine car its different & you can achieve much better braking on all four wheels & get the rear brakes working harder.
This is because the car sits flatter under heavy braking with less weight moving around.

For a buggy I believe a certain amount of front weight transfer when applying front brakes to be a good thing.
As front wheel traction under brakes is difficult to achieve & weight transfer forces the wheels into the ground & gives them more traction.
But thats just my opinion.
"There can't be a practical reason for believing in what isn't true" – Sir Bertrand Russell.
User avatar
Tony
Administrator
 
Posts: 5861
Joined: Mon Feb 27, 2006 11:07 am
Location: Perth, Western Australia

Re: The new Piranha, Joost Kolken, Holland

Postby joost » Sat Jul 09, 2011 6:34 am

Thanks Rayatswan I think Tony has answer your question/opinion.
User avatar
joost
Trax II
 
Posts: 204
Joined: Sat Dec 13, 2008 2:03 am
Location: Holland

Re: The new Piranha, Joost Kolken, Holland

Postby joost » Mon Sep 05, 2011 3:54 am

My exhaust is done, only have to make a mount plate for the silincer.
Exhaust is weld with backing gas.
I bougt a Honda Civic radiator with fan.
Steering rack is done and made the first meters with the buggy:P
I made a chain and brake disc protector (cnc plasma cutted)
Image
Image
Image
Image
Image
Image
Image
Image
User avatar
joost
Trax II
 
Posts: 204
Joined: Sat Dec 13, 2008 2:03 am
Location: Holland

Re: The new Piranha, Joost Kolken, Holland

Postby ErwinBnl » Mon Sep 05, 2011 11:45 am

Awesome! :shock:

Now I see what the laser cut plate is for.. I thought it was a skid plate but didn't see how it was mounted, until now :P

Now put some brakes on that beast and hook it up a car instead of a forklift truck :wink:


I want to visit you very soon to finally meet you and see your awesome buggy in progress!




Keep us updated!!

Erwin
ErwinBnl
Registered Member
 
Posts: 15
Joined: Mon Jan 11, 2010 6:32 pm

Re: The new Piranha, Joost Kolken, Holland

Postby Tony » Mon Sep 05, 2011 12:58 pm

Looking real good Joost !
"There can't be a practical reason for believing in what isn't true" – Sir Bertrand Russell.
User avatar
Tony
Administrator
 
Posts: 5861
Joined: Mon Feb 27, 2006 11:07 am
Location: Perth, Western Australia

Re: The new Piranha, Joost Kolken, Holland

Postby tonka » Wed Sep 07, 2011 6:47 am

love the exhaust joost,looking very profi.
hmmm
tonka
Raven
 
Posts: 62
Joined: Sat Jun 02, 2007 6:12 am
Location: netherlands

Re: The new Piranha, Joost Kolken, Holland

Postby Twigster » Sun Dec 18, 2011 3:02 am

Hi all, really nice looking build Joost, i have a question from way back when you lengthened your frame, i have got to the point in my project where i have the engine all mounted and plumbed in but i have kind of neglected the fact i have almost no room behind the seat for the header pipes. The frame size is totally standard so i am thinking about lengthening the engine bay by 150mm and the cockpit by 100mm to make it more roomy. i have read a fair bit about strengthening the joints when we joining back together but have a very simple questions still (i am probably being really dumb):
you see in the below photo where you have cut the frame and the top frame halves are level with each other,
Image
ie they arnt making a straight line any more, in the next picture where you have welding the lot back together they look starlight again, how did you do this? to me it doesn't even look possible with out further modification.
Image
here is a diagram to show what i mean:

It just doesnt make sense to me, how the heel did you keep it straight?
Image
any help much appreciated, Alex.
Twigster
Registered Member
 
Posts: 18
Joined: Tue Jan 18, 2011 7:00 am

Re: The new Piranha, Joost Kolken, Holland

Postby 76oliver76 » Fri Dec 23, 2011 12:20 pm

This is what i found when i lengthened mine i was gonna have a wonk in it. I think the angle of the picture doesnt show the wonk here, Easily solved though, cut the full length out from the rear roll bar right to the front roll bar and replace the whole lot, thats what i did on mine worked a charm, no wonks!!!
yzf1000R piranha coming soon!
76oliver76
Registered Member
 
Posts: 25
Joined: Fri Feb 19, 2010 10:04 am

Re: The new Piranha, Joost Kolken, Holland

Postby joost » Sun Aug 16, 2015 4:32 am

Hello everyone,

It's a long time since my last post, but the progress was still going on and started a new education, bachelor mechanical engineer.
The last time of the build was going well and much progress.
First shakedown was going very well lots of power and very nice to handle.
Only the spring needed some adjustment because the low ride hight.
The steering angle is not so much, i will make some new misalignment spacers with a bigger angle.
The roller sprocket makes lots of noice when your of throttle, made some out of plastic (pom).
The steering wheel is a bit of small size.
Second shakedown i had a slipping clutch, have bought some heavy duty springs and that's much better. Does anybody know some oil additives (friction modifiers), to get more friction for wet clutches.


Some pictures of the build.
Image
Feul hose, with dash connectors
Image
One liter catch tank.
Image

Wiring my digidash and onther componemets. (ETB Digidash (same as the rage buggy's use) with gear indicator, shift lights, fuel level and many more)

Image
Image
Electric cabinet
Image
Getting ready for the first shakedown.
Image
Image
Image
Image
First ride out.

Image
Image
Image
Image
Image
Image
Image
Image

For more pictures, check my photobucket.
http://s436.photobucket.com/albums/qq89/ulakecorpait/
User avatar
joost
Trax II
 
Posts: 204
Joined: Sat Dec 13, 2008 2:03 am
Location: Holland

Re: The new Piranha, Joost Kolken, Holland

Postby Corza19 » Sun Aug 16, 2015 10:38 am

Awesome work mate! Looks great 8)

-Corey
"Drop a gear and disappear"
Corza19
Trax II
 
Posts: 276
Joined: Mon Dec 01, 2014 7:16 pm
Location: Victoria, Australia

Re: The new Piranha, Joost Kolken, Holland

Postby Tony » Mon Aug 17, 2015 10:51 am

Great looking buggy & really good quality.
Well done.
"There can't be a practical reason for believing in what isn't true" – Sir Bertrand Russell.
User avatar
Tony
Administrator
 
Posts: 5861
Joined: Mon Feb 27, 2006 11:07 am
Location: Perth, Western Australia

Re: The new Piranha, Joost Kolken, Holland

Postby 14WRC » Tue Aug 18, 2015 3:45 am

Thanks for the sharing looks great
D Day Fabrications
14WRC
Trax II
 
Posts: 459
Joined: Sun Jan 30, 2011 8:34 pm

Re: The new Piranha, Joost Kolken, Holland

Postby Antman » Tue Aug 25, 2015 11:53 pm

Looking Great Joost, Be proud of you workmanship !!
ANT'S TIG N TRICK'S
0431198660

For all your coded TIG needs & 3D AUTO CAD service's in Ellenbrook
User avatar
Antman
Raven
 
Posts: 70
Joined: Fri Jan 20, 2012 9:27 pm
Location: Ellenbrook, WA

Previous

Return to Tell Us About Your Ride !

Who is online

Users browsing this forum: No registered users and 1 guest

cron