installing extra head gaskets on apex

[mbarryracing]

Thanks Ted!

 

[HURRICANE]

It was Dave at Powderlites that taught me how to set loab centres. It was a long process for me to grasp the theory and to learn how to do it but I'm glad today that Dave stuck in there with me. For me, I believe in low compression pistons over 10to 12 lbs boost because of issues like squish band design etc. However,under 10lbs boost, it's alot cheaper and easier to shim the head. Either way, setting the loab centres to retain cylinder pressure makes power. Some of the intake charge will escape past the exhaust valve until the valve closes therefore losing some of the charge that your trying to boost in. I'm 200ft above sea level and my cams are set to 114 loab centres. At 30lbs boost it makes 500hp but for a bad trail-lake set up,20lbs boost makes 400hp and that kind of power is achievable to everyone

 

[powderlites]

Cam timing

Here is what comes with our Nytro kit to make things easyer.
http://www.powderlites.com

 

[srxguy]

What about cam timing on a rx1 with a turbo?

 

[powderlites]

Cam timing

Boosted motors like these ones have about 68-72 degrees overlap.
No need for that on a turbo cause charge just blows right through when valves are open.
HP goes right out with the charge.
Run less boost ,better throttle response, more power with proper cam timing

 

[WesG]

I Can't say on dyno numbers, but i have ran both.

I have ran both stock compression/cam timing and with the headshim/intake cam slotted. With the stock setup, the sled definately has thicker power on the bottom, but it builds rpm slower. Not as big of transition when the boost comes on, alot smoother power(would be unreal for a trailsled). It also has more engine breaking effect. With the headshim/cam change, the sled revs faster, hits alot harder when boost comes on, and builds more peak power for the fuel you run. I am NOT saying it builds more power per lb of boost, just that I beleive you can build more peak power for the octane of fuel you run, ie pump gas vs pump gas. Being that I ride in the mountains where I can be wide open for minutes at a time(peak power is more important to me), I run the headshim/intake slot setup. I move my engagement up(~4500rpm) to help get the sled into boost faster and run more boost. If race fuel was not a concern, I would run the stock setup and higher octane fuel. Just my thoughts.

Wes

 

[rxrider]

Re: Cam timing

Here is what comes with our Nytro kit to make things easyer.
http://www.powderlites.com

Do you have one of those for the RX-1 engine?