New Cams New Thread

[Gregger]

I've always loved the sound of a Rocket engine idling with a lope. Yours sounds downright sexy. Can hardly wait for the ride report.

 

[Claviger]

Trying to get on the Dyno this upcoming Saturday in prep for RAA West. Have a few nice days forcast this week to get some gentle rides in and evaluate how far off the tune is.

 

[dealer]

Are you going to make drag shoot out at renagade ?

 

[Claviger]

It sure yet, depends on if I can get on the Dyno in time, not going to run it untuned at the track.

 

[Gerald]

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

Congratulations, looks like you achieved what you were working towards.

 

[1olbull]

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

We just got back from the Oyster Run.
Can you say W-E-T? Twas 150 miles riding in a wash machine!
Mufasa's idle sounds like a half funny car at the line.

 

[Gerald]

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!

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.

 

[Claviger]

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.

No worries, you're absolutely correct. That info on a DOHC engine is critical to correct performance for a given cam grind.

In other news got a little testing in, seems really good. Seems to make better idle torque now.

The good news:
My crank case scavenging is a champ and pulling good crank case vacuum even at idle.
The bad news:
I can hear sucking from the front cover, near the clutch, just after turning the bike off as a result of the vacuum in the crank case paired to a gasket leak. No oil dripping because of internal vacuum, but, going to replace in the AM before riding because if it's sucking air, then it can suck water/dirt/etc.

 

[Claviger]

Dyno locked in for Friday

 

[Idaho Red Rocket 3]

Cant wait to see the dyno report. Exciting isn't it ?