Samuel's Piranha Build

Samuel's Piranha Build

Postby bikebits92 » Wed Jul 23, 2008 9:54 pm

G'day guys
I have been watching the forum for a while now and i have been building my piranha since the start of last year so i thought it was about time i started a build thread.
You may look at my pictures and think that it's not much for one and a half years but that is because i have been making it at school where i only get approx 4-5 hours a week and half of that im just talking or helping other people do things so its a very slow process but its finally starting to look like it could go somewhere soon.
The engine is an SV650 that i got from Manheim fowles for $1000, I was hoping for something a little bigger but there wasnt much else around that day.
Any way, here are some pictures...
Let me know what you think and if any thing looks wrong.
Cheers,
Samuel
P.S. i will have some up to date photos at the end of the week, since these photos i have tacked the rest of the rollbars onto the frame
Image

Image

Image

Image

Image

The donor bike
Image

The engine ready to go into the buggy
Image

I have more on my photobucket if you want to have a look at:
http://s521.photobucket.com/albums/w334/sjacobs1992/
Cheers,
Samuel
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Postby daaboots » Thu Jul 24, 2008 6:09 am

Looks good.
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Postby Jet » Thu Jul 24, 2008 7:26 am

Looks goo d Samuel, It's good you have gone with the CV rear end, even tho you don't need it with that engine, I would suggest making all of the engine mounts removable, so that if/when you want a larger engine, and if you have already painted/powder coated, you wont be cutting and welding up the frame.

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Postby Camel » Thu Jul 24, 2008 10:39 am

Hi Samuel,

wish I'd been allowed to build buggies at school. Would have been a much more productive use of my time than listening to Brother Barret (resplendent in his black cassock and rosary beads) babble sh#t and feel up some of his pet students during religious education classes. Apologise for that Pope Benno!

Anyway, where was I? Oh yeah, the SV 650. Good motor, but, have you run it since you bought it? 18 months is a long time for a bike engine with a broken cam cover.

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Postby bikebits92 » Thu Jul 24, 2008 3:51 pm

I only bought the motor about 3 months ago, so its not that long, And Yes i did get it going for a few seconds to see if it would run,
Since then i have had the cam cover welded up and it is all back together,
just waiting for a new radiator and fuel tank so that i have something to encourage me to finish it faster. :twisted:
Jet, i have made the two rear mounts solid but the rest will be removable so that when i want more power i will just have to make up new removable mounts and if i have to cut the rear mounts off i could probably just wack alittle bit of paint over where they were and probably wouldnt notice it...
By the way Your buggy is looking really good jet and it looks like that one of camels will turn out well aswell,
Thanks for the comments guys,
Samuel
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Postby bikebits92 » Tue Aug 05, 2008 8:46 pm

Finally had a chance to get some more progress today. school has had alot of things going on lately and it always seems to be the day that i have workshop that we have to do something else...
Just fiddled with a few little things today like the swingarms and the engine mounts.
here are some more photo's
Cheers,
Samuel

Image

Image

Image

Image

Image

Image
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Postby bikebits92 » Thu Aug 07, 2008 8:01 pm

Hello again,
I will be buying a sheet of chequer plate soon and will be using it for the fuel tank and various other guards etc, My question is if i get a sheet of 2mm chequer plate would that be thick enough for the fuel tank? or should i go with 3mm?
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Postby matt(boily) » Fri Aug 08, 2008 9:33 am

2mm Should be sufficent. The thickness is mesaured off the thickness of the plate and the chequers aren't added in the overall thickness. I think 2mm chequer is about 2.9mm-3.2mm thick all together.
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Postby bikebits92 » Fri Aug 08, 2008 6:56 pm

okay, thanks,
i got my rack and pinion today, managed to get one off one of the teachers that has a heap of old ford escorts for nothing! i have a couple of questions for when i cut it down though, first is that if you cut the centre rack shaft down to 205mm it is where the cogs are. is this how it should be?

Image

my other question is when you cut the outer casing do you just cut it flush with the edge and cut that lump off in the middle of the picture?

Image

it also has a slight bend that you might notice in the first photo this wont matter much will it?
Cheers,
Samuel
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Postby Jet » Fri Aug 08, 2008 7:24 pm

You really should try to get a straight rack...
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Postby Tony » Fri Aug 08, 2008 7:32 pm

Yep, a bent rack ain't gonna work.
That one is a bannana.
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Postby bikebits92 » Fri Aug 08, 2008 7:38 pm

i should be able to do a pretty good job of straightening it with a bit of heat? Is that where i should cut it?
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Postby bikebits92 » Wed Aug 27, 2008 5:50 pm

Just a couple of quick questions,
I went to get my cds tube for the steering the other day and the place in town that cuts to size doesnt have any... Is there anyone that lives in tassie on here that can tell me where to go to get it cut to size? i dont want to buy a full length as i wont have any other use for it.
Also i got my chequer plate and am about to cut the fuel tank out of it and was wondering whether i should make one whole net and bend it or just cut the shapes out? and i take it that you put the bends at the bottom of the tank because then there is no chance of it leaking at the bottom where the fuel sits?
Cheers,
Samuel
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Postby bikebits92 » Fri Aug 29, 2008 6:45 pm

Can anyone answer my questions? What do you guys do on the mainland about your tube?
This is the last i will be working on the buggy for a few weeks as i have work experience next week and then two weeks of holidays. I put a brace up the side of the motor so that i can put a mount off of it and then i worked on the mount on the other side.

Image

In this mount i will drill a couple of holes in it and bolt it to the top bar on the pircv. would this be strong enough?
Image

Anyway, let me know what you think.
Cheers,
Samuel
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Postby Gsx550taipan » Fri Aug 29, 2008 9:34 pm

looks good mate. that rack is looking a bit on the fugly side. but overall great to see some progress.

cheers... michael
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Postby chrishallett83 » Fri Aug 29, 2008 11:48 pm

I think tube would be much stronger than flatbar on that rear mount. A solid sleeve that goes over the bolt with a short bit of tube cut and ground to fit the sleeve and the housing.
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Postby Jet » Sat Aug 30, 2008 3:10 am

The flat bar is more than enough, how is it going to break? it doesn't look as nice, but it will do the job for sure.
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Postby chrishallett83 » Sat Aug 30, 2008 9:30 am

Jet wrote:The flat bar is more than enough, how is it going to break? it doesn't look as nice, but it will do the job for sure.


Stress fractures induced by vibration? Flat bar is pretty flexible.
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Postby Jet » Sat Aug 30, 2008 12:39 pm

Yes, but over such a short distance, fatigue failure is extremely minimal, especially, what 8mm bar? 30mm long? Its not going to brake, really :lol:
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Postby chrishallett83 » Sat Aug 30, 2008 2:07 pm

Where it is welded there will be a high percentage of carbon deposited in the metal structure in a band through the flatbar, this will make the metal stiff at that point, concentrating all the flexing in the area next to the weld, and making the bracket susceptible to failure. I think.

It is a v-twin, and it does put out what, about 80 whorespower?
I just hate having to go back and modify/fix things after I've made them, that's all. After all, the less downtime, the more driving time right? 8)
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