Tuning 1K cams

[juisii]

Thinking is dangerous... and in most cases expensive...

My -93 FZR 1000 runs just fine (well, a naughty rattle when lifting clutc...Cam chain slack ?) and has more power that daily needed. What I was thinking of, was how to get some BIIIIIG low end torque from the engine, even if it would cost some of the max power. The main idea is to alter the cams. So takin the cams to to machining shop, weld some material to the cams, and machine new angles and lifts... I would hope that the 5 valve construction would be very grateful target for such a "mad scientist" operation, as the middle intake (or two side valves) could be "sacrificed" for the low end torque, at the cost of max power.

Has anyone idea where to start searching info about what exactly do, so that I would have even a slight chance in succeeding

BR Jussi, Finland

[sweekster]

Are you running a stock header and, if so, have you checked to make sure your EXUP valve is working properly? The rattle is usually a symptom of the valve needing service (mainly just lube on the bearings and cable adjustment) and that will cause a loss of low end torque. Also, have you considered just putting on a bigger rear sprocket? You'll get the same effect as what you are describing without all the cam work and a lot less money spent. I'm running the stock gearing (17 front - 47 Rear) with a 530 chain. Going with a 50 tooth rear sprocket will make a considerable difference in how the low end gets affected.

[haro504]

what kind of welding material are you planning to use. im not sure it would be hard enough wouldent it just ware off arnt the cams specially made or heat treated or something or or or or or or or or ?

[haunter]

haro this is a pretty normal way to alter cams, they are called 'regrinds'

[yamaha_george]

what kind of welding material are you planning to use. im not sure it would be hard enough wouldent it just ware off arnt the cams specially made or heat treated or something or or or or or or or or ?

Haro,
as H says this is just a case of using the correct stick material for the welding rod, I used the same stick for repairing Bulldozer "spikes" on the big earth moving quarry diggers. It was known locally as "plough-shear" rods .

I used them to repair the crap original XT 250 cam-followers until Yamaha finally admitted they had a problem.

[juisii]

Hi !

Yes, the actual "manufacturing process" of the cam alteration is no problem. At least if it is done properly. And not even too expensive. Aprox 30 $ for filling /per cam and 10 $ for machining new profile/ cam. But i'm not even dreaming of doing it my self, I totally happy with my porous hobby welds in non critical places..

And about that rattle, it's coming from inside the engine...But at the moment doesn't cause worries

The sprocket modding would of course do the thing on adding torque, but it will do it through the whole RMP scale, and lift the RMP used on daily driving, so not quite what wanted...

And part of the project is to see, can that be actually done ? (in homebrew methods... )

[reelrazor]

Yes, the actual "manufacturing process" of the cam alteration is no problem. At least if it is done properly. And not even too expensive. Aprox 30 $ for filling /per cam and 10 $ for machining new profile/ cam. But i'm not even dreaming of doing it my self, I totally happy with my porous hobby welds in non critical places..

A) Where in the hell on this planet are you, Jusuii??

B) Webcamshafts here in the USA charges $680 to weld/regrind a set of FZR 600 cams

C) Megacycle cams wants $699

D) if you find a service that does it at the prices you quoted-will you let US know?????????

[haro504]

oh i dident realize

[haunter]

oh i dident realize

no worries



reel: that does seem cheap even if its 30+10/lobe.

[sweekster]

A) Where in the hell on this planet are you, Jusuii??

if I remember, he's in Finland

[yamaha_george]

oh i dident realize

No worries Haro, if we know something must be you know something we don't that is how & why this board works so well.

[reelrazor]

And also Jusuii,

There are a couple companies that make adjustable cam sprockets. Altering the cam timing via slotted sprockets CAN, and WILL alter the powerband quite a bit...

The adjustble cam sprockets are relatively cheap and might be a good way to experiment some.

[juisii]

First of all, my apologies, the terminology at this time was misleading...

As i claimed that the price would be for a "cam", I actually meant per lobe. And i had to check the price, as i was referring to a "reliable hearsay", and the filling would be more likely closer to 60 $...

So the price for doing all the lobes is not that cheap, not even here in hell

But the idea of adjustable cam sprocket never crossed my mind, but really needs to be checked. Any ideas where to start asking ?
Could that be done from the existing sprocket ? By machining the existing holes in to "U-shape" ? That would surely be cheap...

And if we forget the price of the camshaft modification, ideas on where to start (or end that ridiculous idea...) looking info, is still welcomed !

[reelrazor]

Could that be done from the existing sprocket ? By machining the existing holes in to "U-shape" ? That would surely be cheap...

Yeah, Falicon offers them for your engine for $54USD

http://www.faliconcranks.com/sprocket_price.html

Could that be done from the existing sprocket ? By machining the existing holes in to "U-shape" ? That would surely be cheap...

Yeah, it can be done...whether or not you can beat Falicon's price and reliability/precision, I guess, depends on the machine shops in your corner of......

I bought Falicon..and it allowed me to swap them out when I did a lash adjustment-with no down time. I retarded my intake a couple degrees to get more low-end punch.

[juisii]

Thats not expensive at all... the machining work here would cost aprox the same...

But the machining option is easy. oh yes, really. I give the sprocket, tell what to do, and collect next day.

If i want to buy such a sprocket, from US, I need to write an email to four different companies and ask could they kindly sell such for me, because i live in the place called "international" Two companies will tell sorry, we don't deliver internationally. One will deliver. The only shipping method is UPS, and shipping costs are 45 USD plus 20 USD for "international order". The last, if lucky, will make the deal with reasonable costs...And the answer can take anything from one day to a month...

http://www.schnitzracing.com/Policies.htm

"ALL FOREIGN ORDERS

All foreign orders are by bank transfers, unless you can submit to us companies in the USA that currently accept your card. Faxing over a copy of your credit card and ID can help this process too. We will not half invoice any sales orders!" -> no info about the shipping costs....

http://www.orientexpress.com/info/About+Us.html

"We service customers both domestically and internationally every day" -> still no info about how and for what price...

Yes, I know, a bit of patience , and little labour (ctrl c + ctrl v for messages ) could give a good results... but still i'm waiting that one day these two continent could be so close, that even european money would be interesting... because fact is that in US the web based trade is waaaaay ahead of ours.

But, now i will write those emails and hope.