How many r's can a kz 1000 buzz before damage

Hardrock, you also have to consider the distance from the center of the valve to the outside edge. A smaller valve can flow more at small lifts then a large valve (in relationship to its size). Think of it as a circumference to surface area ratio. Plus a new R6 has some pretty wicked cams.

to much beer makes me ramble...

Becker wrote:

Hardrock, you also have to consider the distance from the center of the valve to the outside edge. A smaller valve can flow more at small lifts then a large valve (in relationship to its size). Think of it as a circumference to surface area ratio. Plus a new R6 has some pretty wicked cams.

I know about the r6 cams, they are so aggressive the bike doesn't get out of its own way till like 9,000. But from 9-16 it is a straight beast!

So one bigger valve just can't keep up? I know that is the real limitation of these old beast (that and the air cooling... ) Is there any effective work around without forced induction or sewer pipe ports?

APE Jay wrote:

Jeff.Saunders wrote:

The other factor is the crank. The crank is a roller bearing crank - and much over 10,000rpm the rollers stop rolling and start sliding - and that's not good...

Jef;
That is interesting. Do you feel that that is the same for the Suzuki cranks too. The pro stock bikes operate from 10,000 to 13,500. You think they are just sliding the rollers on a pass?

Wonder why they don't just build those cranks with a bronze bushing instead of rollers.

Something to think about.

I have often thought I would want to take the time to figure out what the rpm of one of those rollers is at 10,000 crank speed. Same with a wheelie bar wheel at 230 mph.

Hi Jay, I would imagine the old Suzuki 8 valve bikes of Terry Vance and the like from the late 70's had the same issue. One of the east coast racers running a very serious naturally aspirated Kawasaki drag bike runs a redline over 11,000 - but they do have to replace cranks many times during the season. They've scrounged a few old cranks from me to rebuild.

The rollers are one of the main limitations of the old Z1 cranks - although an incredibly tough crank, they are constrained by the rollers. But to be able to run just 2-3 psi oil pressure is nice - it means in normal use, the cranks are nearly impossible to break...

ok, gonna be dumb, but how does a roller just slide past?
and dont the F1 engines they are running use roller bearing cranks,I seem to remember somthing like that a few years back, and they turn the hell out of them.

back to the roller bearing thought, it dosent need a lot of oil pressure so its more or less just keeping some lubrication to the contact area and has less resistance.

am I wrong thinking like this?

what we learned in engine school about roller crank bearings vs friction bearings. The friction bearing can be kept in a perpetual state of float with precise oil pressure. This means that in theory there is never any direct contact with the bearing and crank journal. Roller bearings however work as advertised and make rolling contact. The problem in reciprocating engines is that the contact is not constant pressure and is usually on only two rollers and sometimes as few as one. In situations of severe detonation this contact can manifest itself as a shattering blow against a roller, crushing it between the steel connecting rod and the steel crank shaft in the case of an un-raced bearing. Think of it as placing a roller on a steel anvil and hitting it with a steel hammer. This can cause the contacting roller to shatter. The contact area on a roller bearing can be extremely small in many situations and the contacting roller has extreme pressure placed upon it. This is why a main bearing can go before a much smaller wrist pin will. Just what I learned in school over thirty years ago.

PLUMMEN wrote:

hocbj23 wrote:

Not sure how to respond.Other than V and H pipe,jetting to match the pipe and a Dyna S ignition and coils,plus a Satrab oil cooler,bike is pretty much stock ("J" cams installed this weekend)..Unless the PO did something to it before he stored it in pieces 20 years ago,it just happens to be a very good running old bike (after 2 years of putting it back together)..So,I didnt "build" it to make power at 9500 rpm - it just does (plus I am no engine builder)..If I ever have to tear it down and redo it,I will certainly heed ur advice.However,the way the bike runs now,it will probably outlive me in its current state.

i didnt mean anything personal,its just everybody seems to get hooked like a big fish at some point and try and build a motor that would be right at home in a 400lb bike built for the track and wonder why its so tempermental on the street.been there and done that myself :laugh:

Didnt take it personally-seen too many of your posts here to believe u would aim a personal shot at someone.Just responded to let u know that at age 71 I dont need a bunch of hp to scare myself silly and the way the old bike runs now is just fine with me.Take care.bj

same here,just got home from my hernia surgery i dont think im gonna be feelingthe need for speed for a while! :S :laugh:

BSKZ650 wrote:

ok, gonna be dumb, but how does a roller just slide past?
and dont the F1 engines they are running use roller bearing cranks,I seem to remember somthing like that a few years back, and they turn the hell out of them.

back to the roller bearing thought, it dosent need a lot of oil pressure so its more or less just keeping some lubrication to the contact area and has less resistance.

am I wrong thinking like this?

the centrifical forces overpower the bearings ability to roll at a certain speed basically locking it against the outside of the bearing cage at a certain speed like an amusement park ride :laugh:

You'r suppose to ride the bike not push it or in your case carry it. :laugh: I'm glad you don't have a 1300 you would be on your third operation.

ive got to stop getting mad and man handling heatpumps by myself,im oficially on vacation! :woohoo:

This is why I got out of the AC business. I specialized in repair of window and sleeve units. When you have to carry a 24,000BTU unit down three flights of stairs, it can be a bitch. Especially when it's a unit from the 60's. When I turned 50 I said enough was enough. I am surprised that I have have not had hernia.