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Discussion Starter #1
Hi There,

Just been looking in the Yamaha parts catalogs:

Interseting points about the FZ6 engine and its donor R6 engine:

Description FZ6 Part Number R6 Part Number
Cam sprocket bolts 90105-07004-00 90105-07342
Cam sprockets 5VX-12176-00-00 5EB-12176-00
Cam shaft 1 5VX-12170-00-00 5SL-12170-00
Cam shaft 2 5VX-12180-00-00 5SL-12180-00
Timing chain 94591-49120-00 94591-49120
Timing tensioner assembly 5SL-12210-10-00 5SL-12210-10
Timing rotor 5VX-81673-00-00 5SL-81673
Crankshaft 5SL-11411-00-00 5SL-11411-00-00
Rod assembly 5SL-11650-00-00 5SL-11650-00-00
Piston 5SL-11631-00-00 5SL-11631-00-00
Rings 5SL-11603-00-00 5SL-11603-00-00
Head Gasket 5VX-11181-00-00 5SL-11181-00-00
Rocker Cover Gasket 5SL-11193-00-00 5SL-11193-00-00
Intake Valve 5EB-12111-00-00 5EB-12111-00-00
Exhaust Valve 5SL-12121-00-00 5SL-12121-00-00
Intake outer valve spring 5EB-12114-00-00 5SL-12114-00-00
Intake inner valve spring 5EB-12113-00-00 5SL-12113-00-00
Exhaust Valve spring 5EB-12124-01-00 5EB-12124-01-00
Valve shim (1.20) 1HX-12168-00-00 1HX-12168-00-00
Cylinder Head Assembly 5VX-11101-00-00 5SL-11101-00-00

So it appears a "5VX" is an FZ6, a "5SL" is an R6 have no idea what a "5EB" is ???

Yamaha claim:

R6:12.4 compression ratio, 117hp @13,000rpm and 66.4nM torque @ 12,000rpm

FZ6:12.2 compression ratio,98hp @12,000rpm and [email protected],000rpm

I beleive the Cam shafts accounts for most of the power/torque gains for the R6, I have no idea why it has different cam sprockets (connection betweeen cam and sprocket, might explain the different bolt) The rods, piston,rings,valves,valve springs and crank shaft are all the same, The head gasket is different (might explain the slightly higher compression ratio) SO I think the only diffrenece with the head is the colour!

The injection seems to be a big difference but I dont think the later "group" type injection that debuted on the FZ6 could make less power than the piston suction type on the current model R6. Rumour has it that the 2006 R6 is going to have the same group injection system as the FZ6 and I dint think Yamaha would be de-tuning a supersport machine.

The timing must be different on the FZ6, as timing rotor has 8 legs on an FZ6 and the R6 only four, so the ECU and iginition signals must be very different.

Anyway, slap in some R6 cam shafts and head gasket, and you should have 117hp and 3 more nM's!!!

Anyone know:

1. What model a "5EB" is cause the FZ6 has lots of its parts.
2. Better knowledge of R6 throttle bodies and the FZ6 ones ?
3. Any other diffrences, like airbox volume flows...etc ???

Cheers,

Byron.
 

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Yeah it's fast...
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I am doing some serious thinking to swapping intake systems from an 04-05 R6, only problem is I am not sure if I would be able to use the stock airbox.
 

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So would a thinner head gasket give less room in the cumbustion chamber, therefore raise the compression ratio, and give more horse power? Would this just invovle taking the head off and swaping out gaskets?
 

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Discussion Starter #4
Thinner head gasket

Well I would have to measure both to be sure that the R6 one is thinner and yes it would increase the compression ratio and power in theory. However 0.2 aint much in the scheme of things and this mod alone wouldnt be worth the time doing. The cams seem to be the secret as all the other major parts are of the shelf R6 parts, still If I blew a head gasket on a road bike I would install an R6 gasket as a replacement its even listed in Australia for cheaper!

Regards,

Byron.
 

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Discussion Starter #5
Have to look at the intake plenums, but you can be sure it wont fit, otherwise Yamaha would have used the R6 airbox, they must be very expensive to develop an all new airbox, not sure about chassis/frame differences between R6 and FZ6. the FZ6 is die cast and R6 another construction method, how much they changed the shape I dont know, I know its engine mounts are are not the same. The FZ6 is missing some at the top

Regards,

Byron.
 

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Take a look at BIKE from last month (european mag). They did a really interesting article on sticking older cams from the yzf in a new r6. They remaped the ecu and put smaller trottlebodies back on it. It dropped the hp by 3 or so. But it brought the peak hp way lower in the rpms. They did a test with 20 people and only 2 picked the stock r6 as the better ride. Everyone liked the one with OLDER cam profiles because it was usable power.

Good read, If you want to swap in cams I'd recommend reading that article.
 

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Will someone clear this up for me:

Everything I've seen "claiming" HP for the FZ-6 is: 98hp at the wheel

Everything I've seen "claiming" for the 2005 R6 is 123hp at the crank with ram air, 117 at the crank without ram air

Now, motorcycle.com did a test and they were getting 103-104hp at the wheel with an '05 r6.
http://www.motorcycle.com/manufacturer/yamaha/2005-yamaha-r6-track-test-3909.htm

From what I've seen, FZ's are getting 94-95 at the wheel.

Now, it seems to me like everyone thinks they're going to swap cams and get 117 hp at the wheel when the comprable r6 doesn't even do that.

Maybe they don't see the discrepancy between the measurements taken at the crank by Yamaha and at the wheel by people in the real world?

Yea, swapping the cams, if they're a direct bolt in, may produce a couple more peak hp, maybe 5-10% even at peak, but it will kill everything down below it. And that's even if you can get the FI, computer, and rev limiter to cooperate...

Swapping cams may be great for some people and I'm not knocking it, I'm just saying that I think too many people are getting confused by not reading and think they're going to be pumping close to 120hp to the ground and from what I've seen from the articles and research, it just isn't going to be true.

And I will say, I would like to see someone go through with a cam swap, and a dyno day with a PCIII and see what the graphs look like, see how the street riding is affected, and how fuel economy is affected.

:popcorn :cheers :beer :banana
 

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The Flying Finn
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Dude, this thread's 3 years old! :D

That said, I'm 99% sure the 98 HP FZ6 claim is crank HP. Most stock FZ6's seem to be getting more like 90 hp at the wheel, so if you can swap in cams and tune a PCIII and get 100-105 HP that's not too bad.

It looks like ronayers.com has the R6 cams for $144 and $146, and a thinner HG to raise the compression a little. Plus the PCIII, of course you'd need to tune everything to run on 91-92 R+M/2 gas to make any use of the compression.
 
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