Trinity Racing

[trickedcarbine]

But not all Cheetahs are PV.

 

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All Cheetahs are set up for PV's in the casting process. It's up to the builder to install block offs or the PV's

[Ayesully810]

All Cheetahs are set up for PV's in the casting process. It's up to the builder to install block offs or the PV's

Didn't know that! Learned something new today

 

 

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[PaymentPlan]

All Cheetahs are set up for PV's in the casting process. It's up to the builder to install block offs or the PV's

Pros and cons of block off plate and PV?

 

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[trickedcarbine]

http://www.atvdragracers.com/forum/two-stroke-technical/2826-power-valves-vs-block-off-plates.html#/topics/2826?_k=9egvtx

[sheerider11]

Pv you can "control" the power and when.

Super sweet set up and I would run one in a second if I could.

Block offs are just wfo exhaust.

[Ayesully810]

Pv you can "control" the power and when.

Super sweet set up and I would run one in a second if I could.

Block offs are just wfo exhaust.

Do the power valves change the port timings? How does it work?

 

 

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[trickedcarbine]

Some are controlled by an electronic servo and move according to RPM. But most are pneumatic. That means they use exhaust pressure to actuate. When pressure builds, the valve opens and similulates the exhaust port getting bigger. Almost like it goes from low timing trail type port to a higher duration drag port. You can tune them using spring pressure and some use bleeder jets. Kind of like a turbo wastegate.

[Ayesully810]

Wow.. So you can set it up so it almost makes power all over the place then right ? How come more people don't run these?

 

 

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[JTmachining]

Cheetos came casted solid like others. PV part in cyl has to be machined. Not all were machined. Also there's a lot more to DM than Cheeto and others than wats listed here

[Ayesully810]

Cheetos came casted solid like others. PV part in cyl has to be machined. Not all were machined. Also there's a lot more to DM than Cheeto and others than wats listed here

What else is to be known? Educate me

 

 

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[JTmachining]

What else is to be known? Educate me

 

 

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I'm not dat smart

[Ayesully810]

 

 

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[trickedcarbine]

Cheetos came casted solid like others. PV part in cyl has to be machined. Not all were machined. Also there's a lot more to DM than Cheeto and others than wats listed here

 

For sure. Serval, Cub, DM, DMX, Cougar, Caracal, Puma, Sphinx, Liger, etc... All with different bore & stroke combinations. Different stud lay outs, different spread, different deck heights, different exhaust flange just about anything you are willing to pay for and wait for they can do.

 

Have you seen any Cheetahs plated and un machined from CP without it being a DM? I tried to get one like that and Harry stated his were all machined. I thought he was doing all the finish work on PV's?

[JTmachining]

Have you seen any Cheetahs plated and un machined from CP without it being a DM? I tried to get one like that and Harry stated his were all machined. I thought he was doing all the finish work on PV's?

Ya

[SandSlingerOR]

I got a silly question, why is the pv basically useless on bigbore 250rs? All those guys say it's a waste to buy a 350 on up PV cylinder.