Gen 2 Engine Development begins

[Bertrand]

Hi!
Soon on sale?

 

[mngforce]

We now have the 2nd lower case Bored/Sleeved. We will be building this up through the month of November. Expect Pics soon.

 

[mngforce]

View attachment IMG_2480.jpeg Testing on the flow bench for best valve shape before ordering custom oversized valves

 

[mngforce]

Flow testing different valve shapes before ordering custom oversized valves

 

[Bertrand]

Cool ! Thank you for your feedback.

 

[mngforce]

Studying the modified cams to select valve springs and design valves.

 

[Bertrand]

Wow! great! , but I don't understand everything
Duration, lifting, that I understand. But the other curves, I don't understand!
Can someone explain to me?

 

[mngforce]

Wow! great! , but I don't understand everything
Duration, lifting, that I understand. But the other curves, I don't understand!
Can someone explain to me?

You have a lift curve. Shows lift and duration. Self explanatory (Blue)
Then you have a Velocity Curve which shows how fast the cam opens at a given point. (Orange) Used to determine the cam bucket size
Then an Acceleration Curve, which says just how fast the velocity is increasing or decreasing. (Green) Used to calculate the forces against the valve springs. Helps choose a valve spring.
Lastly you have Jerk. That's the rate of change of acceleration. (Red) Determines how aggressive, or gentile the cam is against the valve train. Helps determine if you will have spring surge, or not.

 

[Sam's2ndgen]

Can't wait to see how this performs.
That's a lot of duration, how does it compare to the stock cam profile?

 

[mngforce]

Can't wait to see how this performs.
That's a lot of duration, how does it compare to the stock cam profile?

The only plot I have of the stock cam is when we were just starting to refine our software. So, we did not have duration points in there yet. I will see if we can measure a stock cam and overlay it for you. Here's the original stock cam plot. It shows a very high accelerating rams, but with low jerk. That means it's a fast cam with low impact to the valve train components. Ignore the values in the legend. We had not written the part of the software that calculated max values yet. Creating a cam stand and writing the software was way more work than I thought it would be.

 

[Bertrand]

Sorry for my late return after your previous post.
Great work! I can't wait to see the result!

 

[Sam's2ndgen]

I love the idea of adding more displacement, but for the ones that don't have that kind of budget, I would imagine you could just do a piston upgrade (and maybe rods if necessary) but keep it stock bore and stroke, then do all of the top end stuff and it would still be fantastic and likely be capable of more rpm with all of that airflow potential feeding less displacement than the bored and stroked version. I can't afford $20k+ for the full build but I might be able to do the top end and a piston upgrade. What are your thoughts?