New Cams New Thread

Claviger said:

You asked what a small change can do? Here ya go, a small adjustment:

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Claviger said:

Complete with mechanical part!! Need to wash it... oh god poor baby has oil, coolant, grime, dirt everywhere. No test ride today, it's pouring rain and testing out a new engine in the wet... pass.

If you listen closely you can hear the slight lope, even at 1100 RPM:

First press of button, crank, crank, fire. Exactly as God and Triumph intended. No throttle silliness required, no multiple attempts. Single battery. All the silliness that I had going on before is gone for starting. TBs perfectly synced at 660 during idle, the lope is very much from the cams hehe

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Jvheli said:

Well in this case, we are talking about too high cranking pressure. Which in this case is the intake cam closing too early on the compression stroke (more air volume to compress). The cam gear Rob has (me too) are slotted so it’s easy enough to advance or retard each cam. Ramp rates and duration are the cam grinders domain. All we can do is advance or retard what’s been ground.

What I’m curious about is how much can be dialed out and still make good power.

Robs reading is pretty close to what I’m seeing(not quite as high).

Just curious, I’m no motor expert!

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Gerald said:

I agree can't change the duration but by changing the advance/retard on gears but can change opening/closing times which causes differences in ramp timing and overlap. On automotive performance cams, usually the cam manufacturer sends a card recommending where to set cam timing. Then you can try settings a few degrees different from card if you are searching. Usually manuf. knows best. I shouldn't have butted into conversation, I apologize.

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