Planet Minis

Mx__501 · 08-10-2008, 07:36 PM

In a YX head can i make it work??

firepower354 · 08-10-2008, 09:04 PM

No. Not much reason to, either. The port is why the +R and V2 make more power. The roller rocker is a sales gimmick. IN THEORY, the ramps can be made more aggressive. In practice, it sells well.

357 Racing · 08-10-2008, 10:04 PM

But most roller rockers are aluminum, so there lighter correct? That = less power to move the part = a small hp gain.

firepower354 · 08-11-2008, 06:05 AM

Overall weight at the tips might tilt in the steel rocker's favor

It takes a lot more aluminum to do the same job as steel.

507 brett · 08-11-2008, 08:28 AM

ok, but wouldnt a roller roker create less friction than a normal rocker?
that would mean a lil more hp..

gecko · 08-11-2008, 08:40 AM

True roller tip rockers; prevent friction and the side loading of the valve stem.

firepower354 · 08-11-2008, 09:13 AM

Quote:

Originally Posted by gecko

True roller tip rockers; prevent friction and the side loading of the valve stem.

Reduces friction

And the V2/+R ain't got 'em...

firepower354 · 08-11-2008, 09:19 AM

Quote:

Originally Posted by 507 brett

ok, but wouldnt a roller roker create less friction than a normal rocker?
that would mean a lil more hp..

Look at the exploded view the current performance cycle engines and see how many use them. The rocker rides on a thin film of oil, not metal to metal contact, or failure would be instant. The frictional losses are miniscule, and the added weight of the roller has to be pushed up & down adding resistance. Might even require stiffer valve springs, adding more resistance.

507 brett · 08-11-2008, 09:34 AM

oh, that makes since. i was just thinking it wouldnt have as much friction because rolling friction is less than sliding friction (science class..) but what you said makes since...

so it really kinda evens out between a roller head and a non roller head, if they had the same size valves.

08-10-2008, 07:36 PM	#1 (permalink)
Mx__501 1st Gear Member Join Date: Feb 2008 Location: League City, Texas Posts: 188	Roller Rockers In a YX head can i make it work??

08-10-2008, 09:04 PM	#2 (permalink)
firepower354 3rd Gear Member Join Date: Oct 2006 Location: Flint MI Posts: 6,263	Re: Roller Rockers No. Not much reason to, either. The port is why the +R and V2 make more power. The roller rocker is a sales gimmick. IN THEORY, the ramps can be made more aggressive. In practice, it sells well.

08-10-2008, 10:04 PM	#3 (permalink)
357 Racing 3rd Gear Member Join Date: Dec 2006 Location: Austin, Texas Posts: 3,575	Re: Roller Rockers But most roller rockers are aluminum, so there lighter correct? That = less power to move the part = a small hp gain.

08-11-2008, 06:05 AM	#4 (permalink)
firepower354 3rd Gear Member Join Date: Oct 2006 Location: Flint MI Posts: 6,263	Re: Roller Rockers Overall weight at the tips might tilt in the steel rocker's favor It takes a lot more aluminum to do the same job as steel.

08-11-2008, 08:28 AM	#5 (permalink)
507 brett 3rd Gear Member Join Date: Jan 2007 Location: mt. pleasant, NC Posts: 2,086	Re: Roller Rockers ok, but wouldnt a roller roker create less friction than a normal rocker? that would mean a lil more hp..

08-11-2008, 08:40 AM	#6 (permalink)
gecko 1st Gear Member Join Date: Aug 2006 Location: Manchester, CT Posts: 195	Re: Roller Rockers True roller tip rockers; prevent friction and the side loading of the valve stem.

08-11-2008, 09:34 AM	#9 (permalink)
507 brett 3rd Gear Member Join Date: Jan 2007 Location: mt. pleasant, NC Posts: 2,086	Re: Roller Rockers oh, that makes since. i was just thinking it wouldnt have as much friction because rolling friction is less than sliding friction (science class..) but what you said makes since... so it really kinda evens out between a roller head and a non roller head, if they had the same size valves.

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