340 dyno chart thoughts

omg for heaven's sake!

Look at this website and scroll down to the part where it says
"Cam timing @ 0.050 tappet lift"
Hughes Engines

Now go to this website and look at where it says "Valve Timing @ 0.006 Lift"
20-224-4 - Xtreme Energy™ Hydraulic Flat Tappet Camshafts

Do you realise that duration @ 0.006 is ALWAYS going to be a higher duration figure than the same camshaft measured @ 0.050". You DO know that they're different right? why are you trying to compare two cams but using different methods to measure them? Seems pretty silly right?

Congratulations, you're measuring a big cam with a big ruler (duration @ 0.050") and coming up with a numerical measurement for the result.

Then you're comparing it to a much smaller cam, but instead of using the same ruler, you're making the ruler smaller as well (Duration @ 0.006") and then getting the same/similar numerical measurement as a result.

Seriously, If you MUST compare this solid cam to this hydraulic cam, Use the same type of measurement for both. go to a cam calculator website and type in the comp cam's 0.050" specs for 230/236 duration, along with the 110 lobe separation and the 4 degrees of advance. Let me know if you still think that the IVC is 63 ABDC.

Even still, the lash will make the solid cam have less duration @ the valve than it has at the lobe due to lash. So like i keep saying the entire comparison is pointless.

Newsflash, you will NEVER see a solid cam advertised as seat duration. or @ 0.006". The closest thing you are going to get is probably going to be duration @ 0.020" lobe lift. Makes it pretty freaking hard to compare a hydraulic to a solid doesn't it?

If you want to talk about dynamic compression ratio, you are going to need the hughes cam's specs @ 0.020", the website doesn't give these. only the 0.050" specs

And yes, earlier I did state "ATDC" for the IVC when I should have written ABDC. You knew that's what we were both talking about since there is no such thing as an IVC ATDC. Sincere apoligies there.

This was fun, I honestly feel like you will soon where you went wrong in this example. You have the right idea about most things. I'm sure you will have a clearer understanding soon. No hard feelings. Let's do it again some time.