Camshafts - cam timing Sidewinder vs SR Viper?

[Janne339]

What different with camshafts? Lift, duration, overlap compared to the Viper 1049 cc?

 

[Big_Phil]

What different with camshafts? Lift, duration, overlap compared to the Viper 1049 cc?

I would phone Dave up at hurricane, or maybe try and message him on here. He would know.

 

[DranttelSS]

What different with camshafts? Lift, duration, overlap compared to the Viper 1049 cc?

Not sure if this helps you but according to our 2017 tech update book they have the same cam profile as a RS Vector.

 

[Srxspec]

Lift, overlap, duration, all are changed compared to SR Viper model. One of my things to try this summer is a set of cams from the 2016 SR Viper engine, I really believe this affects throttle response.

 

[Srxspec]

RS Vector/Sidewinder Cam Specs

• Intake Open 35* BTDC
• Intake Closed 45* ABDC
• Exhaust Open 45* BBDC
• Exhaust Closed 35* ATDC
• Overlap 70*
• Intake Duration 260*
• Exhaust Duration 260*
• Intake Centerline 95* ATDC
• Exhaust Centerline 95* BTDC

FX Nytro/SR Viper Cam Specs

• Intake Open 38* BTDC
• Intake Closed 58* ABDC
• Exhaust Open 54* BBDC
• Exhaust Closed 34* ATDC
• Overlap 72*
• Intake duration 276*
• Exhaust Duration 268*
• Intake Centerline 100* ATDC
• Exhaust Centerline 100* BTDC

 

[Big_Phil]

RS Vector/Sidewinder Cam Specs

• Intake Open 35* BTDC
• Intake Closed 45* ABDC
• Exhaust Open 45* BBDC
• Exhaust Closed 35* ATDC
• Overlap 70*
• Intake Duration 260*
• Exhaust Duration 260*
• Intake Centerline 95* ATDC
• Exhaust Centerline 95* BTDC

FX Nytro/SR Viper Cam Specs

• Intake Open 38* BTDC
• Intake Closed 58* ABDC
• Exhaust Open 54* BBDC
• Exhaust Closed 34* ATDC
• Overlap 72*
• Intake duration 276*
• Exhaust Duration 268*
• Intake Centerline 100* ATDC
• Exhaust Centerline 100* BTDC

Hey Allen, Would the sidewinder cam be better for a boosted application with the less overlap, or is this a case of Yamaha using up the parts bin? Or will you not know till you test?

 

[Janne339]

RS Vector/Sidewinder Cam Specs

• Intake Open 35* BTDC
• Intake Closed 45* ABDC
• Exhaust Open 45* BBDC
• Exhaust Closed 35* ATDC
• Overlap 70*
• Intake Duration 260*
• Exhaust Duration 260*
• Intake Centerline 95* ATDC
• Exhaust Centerline 95* BTDC

FX Nytro/SR Viper Cam Specs

• Intake Open 38* BTDC
• Intake Closed 58* ABDC
• Exhaust Open 54* BBDC
• Exhaust Closed 34* ATDC
• Overlap 72*
• Intake duration 276*
• Exhaust Duration 268*
• Intake Centerline 100* ATDC
• Exhaust Centerline 100* BTDC

Thanks!

 

[Janne339]

Hey Allen, Would the sidewinder cam be better for a boosted application with the less overlap, or is this a case of Yamaha using up the parts bin? Or will you not know till you test?

I'm also curious about that...

 

[staggs65]

I know my viper seemed a lot more potent down low than my winder. I'll be interested to hear the results

 

[sxr70001]

I know in the car world boosted applications don't require or need radical cams. It looks like the Viper cam is more aggressive and has more advance built in because it is naturally aspirated. It could make make a difference in a tuned Winder for sure.

 

[johan]

Hey Allen, Would the sidewinder cam be better for a boosted application with the less overlap, or is this a case of Yamaha using up the parts bin? Or will you not know till you test?

I want to know that myself. As I see it. Wouldn't it be better to open the exhaust later on turbo engine as it's more gases that burn. Same for the intake, is it better to open the intake later to reduce overlap and close it faster as the turbo pressurised the cylinder faster and you don't want the pressure to get back to the intake?

 

[johan]

O

I want to know that myself. As I see it. Wouldn't it be better to open the exhaust later on turbo engine as it's more gases that burn. Same for the intake, is it better to open the intake later to reduce overlap and close it faster as the turbo pressurised the cylinder faster and you don't want the pressure to get back to the intake?

Or is it best to use sidewinder exhaust cam with viper intake cam? And time the exhaust cam to close at 34* ATDC ?

 

[tapex_07]

O

Or is it best to use sidewinder exhaust cam with viper intake cam? And time the exhaust cam to close at 34* ATDC ?

Are talking about in a SW motor as well? So just swapping out the Viper Intake Cam?