Hot Cams Old Style Vs New Style

[Rip'n]

Can anyone tell me the difference in the old style hot cams and the new style. I know the old style dosen't have the decompression mechanism. What dose that mean to my engine and my performance? Thanks

[CFM-Z440]

Both of the old style cams were exactly the same cams, just marked different. I believe they were also more agressive than the current set.

I would like all of the specs also! I have an old style intake, and Im looking to add an exhaust cam to it, or a new style intake, and move my current one to the exhaust...

[bulldogz400]

Ok...so lets see...

Lift in mm ...(example = 9.1 mm)
Duration in degrees...(example = 238*)

Hotcam- Newstyle Stage 1- ...........9.1 @ 238*both Int and Exh
Hotcam- Newstyle Stage 2..............9.6 @243 Int and 9.1 @ 238* Exh
Hotcam- Oldstyle ............................9.6 @243* both Int and Exh
Yoshi-...............................................9.0 @ 236* Int and 9.3 @242* Exh.
Web Grind# 631/294-.....................8.7 @ 224* Int and 8.17 @ 218* Exh.
Web Grind# 293/536......................9.14 @ 226* Int and 9.6 @ 244* Exh.
Web Grind# 288/293......................9.35 @ 234* Int and 9.15 @ 226* Exh.
Web Grind# 288/540......................9.35 @ 234* Int and 9.75 @ 248* Exh.
Web Grind# 540/539......................9.75 @ 248* Int and 10.16 @ 256* Exh.
Megacycle X510..............................10.85 @ 257* Int and 9.78 @ 252* Exh.
DRZE Cams......................................8.92 @ 227* Int ans 9.3 @ 243* Exh.
Stock Z400/DRZ400S & SM cams-.............IN: 8.48 @ 227* and EX: 8.2 @ 243*

Duration refers to how long the cam allows the valve to be open in relation to one rotation of the crank. Simply put, a cam that has a duration of 243* allows the valve to be open for 243* of the crankshafts 360* rotation. In general, a very large degree of duration can help the high RPM stages, yet may hinder the low RPM's. Reason being the valve is/can be open at the wrong time during the pistons stroke.

The lift is simply how wide the valve is open. If the larger the lift, the more air that will enter/exit the cylinder. And as we all know, more air means the allowance for more fuel, which in turn creates more power.

Hope this clears up some questions about which cams will shine in what areas...

[CFM-Z440]

Here are the numbers on the Megacycle web site. I think it is important to mension that Megacycle's sound big in terms of duration, but they are measured at 0.040" of lift instead of the usual 0.050". Dont get me wrong, they are big, but they are not quite as big as they look by looking at the chart.

327 -x9 int. 0.385" lift 248* at 0.040" 104*lobe center Opens @ 20*btc Closes @ 48*abc

327 -x4 ex. 0.370" lift 252* at 0.040" 108* lobe center Opens @ 54*bbc Closes@ 18*atc

That is stage 1 Designed for stock pistons. Use R/D valve springs. Torque and strong mid range.
-------------------------------------------------------------------------------------------------------

327 -x5 int. 0.427" lift 257* at 0.040" 103.5* lobe center Opens @ 25*btc Closes at 52*abc

327-x10 ex. 0.385" lift 252* at 0.040" 108* lobe center Opens @ 54*bbc Closes @ 18*atc

Full race cam. Use R/D springs and high perf. piston. Strong accelleration, increased mid-range power + top-end.



Valve lash 0.008"- 0.010" intake 0.010"-0.012" exhaust

[abarrera76]

the old hotcams are the better grinds,more aggressive.

[zrider2]

so, if i'm looking right, the stock EX cam is more aggressive than the stage 1 hotcam and Yoshi EX cam? so for a mild motor using a stage 1 intake cam with the stock ex cam would be ok? this question seems to come up once a week in here.

[bulldogz400]

People have used the intake cam only with some success. Waaayyyy back when, during the first days of the release of the Hotcams, many members purchased the intake cam only (I was one of them). Keep in mind though, that was when the "Oldstyle", more aggressive cams were in production.

[gun-it01]

QUOTE (bulldogz400 @ Feb 27 2007, 09:39 PM)

Ok...so lets see...

Lift in mm ...(example = 9.1 mm)
Duration in degrees...(example = 238*)

Hotcam- Newstyle Stage 1- ...........9.1 @ 238*both Int and Exh
Hotcam- Newstyle Stage 2..............9.6 @243 Int and 9.1 @ 238* Exh
Hotcam- Oldstyle ............................9.6 @243* both Int and Exh
Yoshi-...............................................9.0 @ 236* Int and 9.3 @242* Exh.
Web Grind# 631/294-.....................8.7 @ 224* Int and 8.17 @ 218* Exh.
Web Grind# 293/536......................9.14 @ 226* Int and 9.6 @ 244* Exh.
Web Grind# 288/293......................9.35 @ 234* Int and 9.15 @ 226* Exh.
Web Grind# 288/540......................9.35 @ 234* Int and 9.75 @ 248* Exh.
Web Grind# 540/539......................9.75 @ 248* Int and 10.16 @ 256* Exh.
Megacycle X510..............................10.85 @ 257* Int and 9.78 @ 252* Exh.
Stock Cams......................................8.92 @ 227* Int ans 9.3 @ 243* Exh.
Duration refers to how long the cam allows the valve to be open in relation to one rotation of the crank. Simply put, a cam that has a duration of 243* allows the valve to be open for 243* of the crankshafts 360* rotation. In general, a very large degree of duration can help the high RPM stages, yet may hinder the low RPM's. Reason being the valve is/can be open at the wrong time during the pistons stroke.

The lift is simply how wide the valve is open. If the larger the lift, the more air that will enter/exit the cylinder. And as we all know, more air means the allowance for more fuel, which in turn creates more power.

Hope this clears up some questions about which cams will shine in what areas...[/b]

Is this for the before 05' models or after, b/c they say the 05' and newer have different cams? just wondering have an 05'.

[Fakie]

QUOTE (gun-it01 @ Mar 1 2007, 01:55 AM)

Is this for the before 05' models or after, b/c they say the 05' and newer have different cams? just wondering have an 05'.[/b]

I dont think the 05 and up cams are much different, if at all.

[sprinterx]

The DRZ bike engines used a slightly different cam profile than our Z's. I think they went to that profile in 05 and that's where the difference is.

[CFM-Z440]

QUOTE (bulldogz400 @ Mar 1 2007, 01:41 AM)

People have used the intake cam only with some success. Waaayyyy back when, during the first days of the release of the Hotcams, many members purchased the intake cam only (I was one of them). Keep in mind though, that was when the "Oldstyle", more aggressive cams were in production.[/b]

Yep, that is what I am doing right now. I am about to add the ex cam to it though. I am pretty happy with my current setup though, it has power everywhere! But you can tell that its strong down low and fades after the mid.

Glad to see this pinned!

[Rip'n]

Thanks for the help! I think I'm gonna go with the webcams, I need to beat a raptor 660 and shut his mouth once and for all!!!

[tlronny]

I have a DRZe ex cam in mine and it is somewhere between a stock cam and the Hotcams one - goes well and lets it rev alittle bit more free'r if thats any help ?

[mrgixxer6]

So how would you tell if you have the old style or new style? i have a great deal on some as new HotCams, both intake and exhaust, and am wondering whether they are new or old. is there a part number or something i could check??

Thanks
Dave

[CFM-Z440]

QUOTE (mrgixxer6 @ Mar 14 2007, 06:44 PM)

So how would you tell if you have the old style or new style? i have a great deal on some as new HotCams, both intake and exhaust, and am wondering whether they are new or old. is there a part number or something i could check??

Thanks
Dave[/b]

Well for one, the old style exhaust cam does not have the auto decompressor, and the new style exhaust cam does.

They do have different part numbers, but I dont know them. The specs are different also. The old ones were more aggressive.

Im excited! My old style cams are about to get broke in!!!