View Full Version : DIY Tank raisers
Inspired by a thread I've been contributing to I took a walk to my local hardware shop and bought two 20mm doorstops at 23p each
http://farm3.static.flickr.com/2003/2123035288_fb9ecbf45a.jpg?v=0
and then popped into the bike shop over the road to buy two M6x40mm bolts at 35p a piece. Half an hour in the garage and I have tank raisers that look pretty good, if I say so myself... and all for a cost of £1-16.
http://farm3.static.flickr.com/2365/2122258961_0bbe7f865a.jpg?v=0
The only other thing I did was pull the snorkel off the airbox, open out the holes in the doorstops with an 8mm drill to take the bolts and cut a small chunk out of the inside of each doorstop with a craft knife to clear the lump in the frame. Dead easy.
tapemonkey
19-12-07, 04:15 PM
Nicely done, thrifty and practical ;)
bah................
i did this ages ago after a sv650.org member ripped me off. and i copywrited the idea,
It was your post saying you used doorstops that gave me the inspiration. but, I couldn't find any photos so I took my own and posted to give the clueless an idea of what's involved.
It was your post saying you used doorstops that gave me the inspiration. but, I couldn't find any photos so I took my own and posted to give the clueless an idea of what's involved.
dont try to talk your way out of it,
my solicitors will be in touch
As I once said to my dad "To be able to claim intellectual property, you must first have intellect"
Genius, is this to improve airflow to the airbox?
Genius, is this to improve airflow to the airbox?
Yes, and apparently it makes your testicles grow bigger too, even if you're a girlie. I read it on the internet, so it must be true.
Genius, is this to improve airflow to the airbox?
Yes, and apparently it makes your testicles grow bigger too, even if you're a girlie. I read it on the internet, so it must be true.
tis true, after the airbox mod, and the tank raiser mod my tezzies grew by a factor od 1.64 :smt119
and apparently it makes your testicles grow bigger too, even if you're a girlie.
I best stear clear of this mod then :D lol
Blue_SV650S
19-12-07, 05:57 PM
Has it affected the fuelling in any way?
I suppose bing a pointy the 'brain' self adjusts to compensate?? :sick:
I haven't a clue, not even started the engine since I fitted them
Don't see the point myself. But I do like the price for such a modification. :)
northwind
19-12-07, 06:19 PM
Has it affected the fuelling in any way?
On the curvy it seems to, once you get rid of the other restrictions (ie tank foam, stock filter) but I wouldn't want to tell you how much.
yorkie_chris
19-12-07, 06:30 PM
We shall see, my bike may accidentally jump onto a dyno soon, so I'll let thee know a before and after.
northwind
19-12-07, 07:25 PM
Better be exactly 33bhp or you'll incur the WRATH OF SV650.ORG :smt003
I've never bothered to a/b it, it costs me £10 a run through youngs so I just fitted the parts, factory pro reckon it does good though. I do know that when I was running lean up top, removing the spacers seemed to take the worst of the 6000rpm hesitation away- though that could be placebo as much as anything else.
Blue_SV650S
19-12-07, 08:25 PM
We shall see, my bike may accidentally jump onto a dyno soon, so I'll let thee know a before and after.
Better be exactly 33bhp or you'll incur the WRATH OF SV650.ORG :smt003
I've never bothered to a/b it, it costs me £10 a run through youngs so I just fitted the parts, factory pro reckon it does good though. I do know that when I was running lean up top, removing the spacers seemed to take the worst of the 6000rpm hesitation away- though that could be placebo as much as anything else.
Er ... I was mainly meaning 'on the move' ... unless you get forced air (not just cooling fan) on a dyno, how on earth are you going to know how it will run at speed? Opening up the tank gap will increase the forced? airflow into the airbox ... this will potentially mess with the fuelling ...
northwind
19-12-07, 08:30 PM
It's not going to be significantly forced, since it's behind the fairing, it just just opens up the air route slightly more than it is already. If it was having a forced air effect, the easiest exit for the air would be out the back of the tank rather than through the filter I reckon. I suspect that it's the extra clearance between tank and filter top that makes the difference, it's suprisingly tight in there. But, that's an educated guess, could very well be wrong.
yorkie_chris
19-12-07, 09:05 PM
Better be exactly 33bhp or you'll incur the WRATH OF SV650.ORG :smt003
Getting the dyno printout to make sure of that
Wouldn't want to have anybody having to climb back on their soapboxes now would I
yorkie_chris
19-12-07, 09:07 PM
I suspect that it's the extra clearance between tank and filter top that makes the difference, it's suprisingly tight in there. But, that's an educated guess, could very well be wrong.
Thats my guess too, we shall see.
Forced air could be a problem on mine, as its nekkid, but if it starts feeling lean at speed then thats where I'd start.
But air is a finicky thing, could even end up with extra turbulence under the tank at speed, which could increase restriction.
(see the earlier thread about forced air where I was jabbering on about how finicky airflow is)
I'll take a chance on it and test it with my 'seat of the pants' dyno. If it feels crap, I'll put it back to standard.
Blue_SV650S
19-12-07, 09:52 PM
Let us know how you all get on :)
I tried something similar on a 400 once. Not raising tank, but taking away the snorkel and a plate that sat below where the snorkel used to 'scavenge' its air ... the inlet was still behind the frame - not in direct airflow, but the increased flow with removed plate fecked the fuelling totally at high speed!! To be fair I hadn't removed the plate myself, it was only when I couldn't get the fuelling right did I look into it further and realise that the plate had been removed ... took me ages to work out why :cry: ... but replacing the plate and suddenly it all worked and I was back to 'respectable' size jets ...
BTW I have put a few washers as raisers on my track SV ;) ... but that is like 4-5mm tops
I can see a problem with carbs, but have a feeling that FI might be a different story. I'm not too clued up on FI systems, I'll have to ask one of my closest friends - she has a PhD in mechanical engineering gained through her research into hydrogen gas fuelled engines and specialises in automotive FI systems.
yorkie_chris
19-12-07, 10:24 PM
I might not be that qualified, but it'll boil down to the engine either having a lambda sensor to sense the mixture, or a MAP/MAF sensor to sense the incoming charge and fire the injectors to suit.
yorkie_chris
19-12-07, 10:46 PM
Is that the sound of an increased charge of air rushing down the pipes... or is it the sound of what I just said going over your head? :-P
Is that the sound of an increased charge of air rushing down the pipes... or is it the sound of what I just said going over your head? :-P
The latter ;)
northwind
19-12-07, 10:59 PM
The SV has a MAF sensor, on everything up to the K7 I think that's the only feedback?
yorkie_chris
19-12-07, 11:02 PM
Are you sure about that
I'm not convinced, thought it was MAP
northwind
20-12-07, 01:10 AM
Ach, might be. Some sort of air mass sensor anyway.
phil24_7
21-12-07, 01:57 AM
All the hardware shops round here keep closing, only the big guns remain and they rarely have unusual things like these tiny doorstops!
bikerskez
25-12-07, 01:01 PM
Hi all,
I got all the bits yesterday and fitted them. Rode to work this morning and the noise from around the tank area is fantastic. Is this change in noise expected?
Hi all,
I got all the bits yesterday and fitted them. Rode to work this morning and the noise from around the tank area is fantastic. Is this change in noise expected?
?
i did not notice that much
Nor did I, but Plymouth is a long way from Flitwick so it's hardly surprising. Oi, Bikerskez, ride past my house and I'll tell ya.
phil24_7
25-12-07, 07:13 PM
Hey bikerskez, I see your in Plymouth, where abouts? You hang out down Jaspers much??
bikerskez
26-12-07, 11:41 AM
There is a slight increase in noise at tick over but once i get going and open the throttle there is quite a difference in noise from before.
Hey bikerskez, I see your in Plymouth, where abouts? You hang out down Jaspers much??
Alright Phil, I'm in Holly Park (posh part of Tamerton) not been down Jaspers for a while due to work, where abouts are you? Chris
Dangerous Dave
26-12-07, 12:15 PM
Hi all,
I got all the bits yesterday and fitted them. Rode to work this morning and the noise from around the tank area is fantastic. Is this change in noise expected?
What air filter are you running? My curvy has a BMC race filter fitted and that makes a great sound under the tank, but adding the tank raisers made the sound twice as good!
bikerskez
26-12-07, 05:55 PM
What air filter are you running? My curvy has a BMC race filter fitted and that makes a great sound under the tank, but adding the tank raisers made the sound twice as good!
Just the standard filter
yorkie_chris
26-12-07, 06:46 PM
Degut it and rejet :cool:
phil24_7
27-12-07, 03:10 AM
There is a slight increase in noise at tick over but once i get going and open the throttle there is quite a difference in noise from before.
I've de-snorkeled mine but still waiting to test it on the open road!
Alright Phil, I'm in Holly Park (posh part of Tamerton) not been down Jaspers for a while due to work, where abouts are you? Chris
I'm in higher compton (No, not Efford) the proper higher compton. Haven't been out on the bike full-stop for a while, waiting till the weather gets a bit better so I can get out to the Torpoint twisties again!
allantheboss
07-01-10, 07:34 PM
Yeah 3-year later bump!
What height is recommended to raise a curvy tank? 20mm still?
Merci beaucoup
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