Author Topic: SiSF, Explain Your Cam Grinds? (Read 9277 times)

medicevans · « **on:** May 19, 2011, 01:56:36 PM »

Steve, I know on the "old board" you wrote up a big thing explaining your different cam grinds you've developed. I know I'm interested in them and why/how they are better and I bet a lot of other people are too. I'm really liking the extra torque the 2mm and adv exhaust sprocket has given me, how much more would a cam grind add?

Can you explain it to all of us again?

Steve in Sunny Fla · « **Reply #1 on:** May 19, 2011, 03:04:23 PM »

Thanks Brian, I'm really busy right now trying to get a 1052cc zg1000 engine assembled, so I'm going to answer piecemeal. I'll start by posting up a dyno chart. This chart was done on the same day / time, 2 different 04 connies of appx the same mileage. the TODD bike was by far the strongest connie I've ever seen on a dyno, to the point that it's almost hard to believe; the OCAMPO bike has my TORQUE cams in it, which is the stock replacement cam I'm offerering. As you see, the bike with my cams outpowers the monster bike to just over 7000 rpm. In fact, look at the 3500 area. Now think of your normal riding... which bike do you think would be quicker for most connie riders? Steve

medicevans · « **Reply #2 on:** May 19, 2011, 03:48:38 PM »

Eagerly awaiting more, but by all means keep working on the bike so someone else can experience your magic.

So how do your torque cam curves look next to a more normal bike? Also, how does the torque curve compare between an exhaust sprocket bike and a torque cam bike? Forgive me if this is all going to be addressed later, just my personal questions. I can be an overbearing eager beaver when I'm learning new stuff.

Steve in Sunny Fla · « **Reply #3 on:** May 19, 2011, 05:45:07 PM »

Here's a dyno chart of the same bike, before with stock cams, advanced EX cam sprocket, 2 mm jet kit, and after with my power grind . Steve

snarf · « **Reply #4 on:** May 20, 2011, 06:15:12 AM »

Quote from: Steve in Sunny Fla on May 19, 2011, 05:45:07 PM

Here's a dyno chart of the same bike, before with stock cams, advanced EX cam sprocket, 2 mm jet kit, and after with my power grind . Steve

WOW that is an impressive change. I was almost drooling while looking at that torque curve.

Steve in Sunny Fla · « **Reply #5 on:** May 20, 2011, 06:31:25 AM »

thanks Chris, it actually is a big change - folks don't realise how difficult it is to get more torque at lower rpms without boring the engine. Cams can make big power at high rpms by virtue of raising the RPM ceiling, and HP is a function of RPM. At lower rpms the only way to increase the torque is to increase the abilty to get the charge moving quickly and trap it before it escapes. That's what both these cam grinds do. The best part is that the torque cams are ground on stock cores, and the price is 275.00... a small price to pay if you have damaged cams and / or want more grunt from the engine without spending huge bux. Steve

GF-in-CA · « **Reply #6 on:** May 20, 2011, 10:02:43 AM »

Steve,

Just to clarify, the first chart you posted is with the torque grind, which are ground on stock ZG cams, and the second chart is with the power/ high lift grind, which are ground on ZX cams, correct? I only ask because in your last post you mention the torque cams as though they are the ones in your second chart, so I was confused.

Steve in Sunny Fla · « **Reply #7 on:** May 20, 2011, 10:23:07 AM »

Gary - you're correct - what i was refering to about the torque cams was that the price is very reasonable. Steve

throb · « **Reply #8 on:** May 20, 2011, 06:50:09 PM »

Dammit, more stuff I didn't know I needed!!!

Two Skies · « **Reply #9 on:** May 20, 2011, 07:57:24 PM »

Quote from: throb on May 20, 2011, 06:50:09 PM

Dammit, more stuff I didn't know I needed!!!

Yep... so far I want everything SISF has made for us!

BTW, love your forum pic! That's one tough kittie!

medicevans · « **Reply #10 on:** May 20, 2011, 08:38:14 PM »

Quote from: throb on May 20, 2011, 06:50:09 PM

Dammit, more stuff I didn't know I needed!!!

No kidding right! Like I need more winter projects! However, after riding with the adv exhaust sprocket and 2min mod, I'm addicted to torque. I think sending my cams in this winter might be in my future........Steve, what's the turn around like?

Also, I know that in personal emails to you, you said there would be no reason to stack the sprocket on the torque grind as the torque grind put the valves in the position of the adv sprocket anyway. I'm assuming you can't go ahead and stack them because further advancing the exhaust valves on top of the cams would mean negative clearance?

DarrellB · « **Reply #11 on:** May 20, 2011, 09:14:50 PM »

There seems to be quite a few addictive personalities on this forum. No wonder I feel right at home.

Equito · « **Reply #12 on:** May 21, 2011, 09:59:59 AM »

Quote from: Steve in Sunny Fla on May 19, 2011, 03:04:23 PM

Thanks Brian, I'm really busy right now trying to get a 1052cc zg1000 engine assembled, so I'm going to answer piecemeal. I'll start by posting up a dyno chart. This chart was done on the same day / time, 2 different 04 connies of appx the same mileage. the TODD bike was by far the strongest connie I've ever seen on a dyno, to the point that it's almost hard to believe; the OCAMPO bike has my TORQUE cams in it, which is the stock replacement cam I'm offerering. As you see, the bike with my cams outpowers the monster bike to just over 7000 rpm. In fact, look at the 3500 area. Now think of your normal riding... which bike do you think would be quicker for most connie riders? Steve

Steve, what jetting changes (from stock) on the Campo/Torque Cam bike?

medicevans · « **Reply #13 on:** May 28, 2011, 04:42:03 PM »

Which ZX are the power cams ground on again?

GF-in-CA · « **Reply #14 on:** May 28, 2011, 04:47:37 PM »

Quote from: medicevans on May 28, 2011, 04:42:03 PM

Which ZX are the power cams ground on again?

1984-85 ZX/ GPz900 or 1986-87 ZX/ GPz1000. I have a set that I'm waiting to get ground, plus an extra set for someone else.

Steve in Sunny Fla · « **Reply #15 on:** May 28, 2011, 07:40:57 PM »

oops - missed some questions - here ya go -

Turn around is immediate. I have cams ground and ready to go. I have a core return program in effect, so when you do the swap and ship your old cams back, I refund the core deposit.

as far as using my advanced exhaust cam sprocket aND the new cam grind, I don't advise it. the advanced sprocket is designed for the stock cam profile, the replacement / torque cams are appropriately timed already, just install in the specified position on the sprockets and you're done. Keep in mind that my advanced exhaust cam sprocket still has all the nessessary stock timing holes, so if you have my sprocket you just shift to the round countersink holes when using the new cams and you're good to go.

Jetting - the Ocampo bike does have my dedicated 2 minute mod jet kit installed. Stock jetting will work, the 2mm jet kit works a bit better - HTH, Steve

connie_rider · « **Reply #16 on:** May 29, 2011, 07:08:29 AM »

Quote from: Steve in Sunny Fla on May 28, 2011, 07:40:57 PM

Turn around is immediate. I have cams ground and ready to go. I have a core return program in effect, so when you do the swap and ship your old cams back, I refund the core deposit.
as far as using my advanced exhaust cam sprocket aND the new cam grind, I don't advise it. the advanced sprocket is designed for the stock cam profile, the replacement / torque cams are appropriately timed already, just install in the specified position on the sprockets and you're done. Keep in mind that my advanced exhaust cam sprocket still has all the nessessary stock timing holes, so if you have my sprocket you just shift to the round countersink holes when using the new cams and you're good to go.

Steve, it sounds like there is a little confusion. Here is the info as I understand it.
Let me know if I have this correct.

NOTE: I have the Power Grind in my 03 (2 Min Mod to follow)
All I can say is,,,, WOW!!!

You have 2 Cam Grinds
Torque Grind (ZG Cam) Does not require Advance Sprocket "Plot" (#1) Torque increase starts at lower RPM. Available now from Steve
GREAT for the twisties or 2 up riding!!!!!!

Power Grind (ZX Cam) "Does" require Advance Sprocket "Plot" (#2) Torque increase starts a bit higher RPM than "TG" has some peak HP increase over stock or PG Cams
"Not in stock" Requires ZX Cams for grinding "REALLY" GREAT for the twisties or 2 up riding!!!!!!

NOTE: To help share the fun with other COGgers, Gary and I have 2 sets of ZX Cams we are willing to offer (fer what we paid ($75)) to any COGger
that wants to do a Power Grind

Ride safe, Ted

Steve in Sunny Fla · « **Reply #17 on:** May 29, 2011, 07:52:31 AM »

Ted, I posted both dyno charts, the first is the torque grind, the second is the power grind. the torque grind does not require the advanced sprocket, the power grind does. It has to do with the way the grinder has to orient the power grind, it has so much lift that he has to set the exhaust cam slightly retarded in order to have enough meat to cut from. HTH, Steve

connie_rider · « **Reply #18 on:** May 29, 2011, 08:28:02 AM »

Ok, I went back and corrected my post. (Hopefully I got it right)
Is there a way to post the 2 Grind Plots together (on one chart) for us Computer illiterates?

Ride safe, Ted

PS: I talked to Gary. We discussed what we paid and decided that we have $75 in each set of our ZX Cams.
If anyone opts to do the power Grind, and if you can't find another set, let us know.

But, if you can find another set somewhere... Buy it!!
They are getting hard to find...

connie_rider · « **Reply #19 on:** June 07, 2011, 01:45:23 PM »

Gary sent me information on a s of ZX-900 Cams that are available on Ebay.

http://cgi.ebay.com/ebaymotors/KAWASAKI-GPZ900-GPZ-900-ZX900-NINJA-CAM-CAMS-SHAFTS-85-/110686543759?pt=Motorcycles_Parts_Accessories&hash=item19c56e9f8f

Ride safe, Ted

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Author Topic: SiSF, Explain Your Cam Grinds? (Read 9277 times)