What is required to raise power peak?

http://www.wallaceracing.com/calc-cfm-head.php

Not perfect but it will show you the effects, if you search a little bit you can find all the underlying math.

Good ol Frenchy thread.  I'll just sit back and watch.

Paul_VR6 (Forum Supporter) said:

http://www.wallaceracing.com/calc-cfm-head.php

Not perfect but it will show you the effects, if you search a little bit you can find all the underlying math.

Thank you    that is exactly what I was searching for.  
 

From the S2k forums:

More on the F20C

F20C

Slippery said:

From the S2k forums:

That is seriously impressive flow numbers. 

In reply to Slippery :

In simple terms If I can achieve that sort of flow. Plus survive at that sort of RPM. I believe I can successfully compete in SVRA's   Group 6 

   I'm going off 30 years memories but I believe the Flathead (1971-1980)  stock flowed about 220 CFM and I believe it opened up to over 300 CFM. @.500 lift. 
  There recently was a great deal of write up about the flow achieved on the Jaguar forum.  I'm going to spend some time looking for those numbers for confirmation.  
ps, looked at the bore and stroke of the S2000 and compared it to the bore and stroke of the Jaguar.

           Honda             Jaguar

stroke  84 mm           70 mm 

bore     87 mm.          90 mm 

   So obviously Honda's piston speed would be much high than Jaguars. 
 While the Jaguar's piston size  would make it heavier than Honda. 
    Am I correct in assuming the S2000 has a cast piston?   ( I can't imagine new Honda owners putting up with the piston slap of a forging).  

In reply to frenchyd :

What is the displacement of each cylinder?

In reply to Slippery :

445 cc for Jaguar. 
499 cc for Honda. 

frenchyd said:

In reply to Slippery :

 

   So obviously Honda's piston speed would be much high than Jaguars. 
 While the Jaguar's piston size  would make it heavier than Honda. 
    Am I correct in assuming the S2000 has a cast piston?   ( I can't imagine new Honda owners putting up with the piston slap of a forging).  

Rods/Pistons/Crank are all forged on S2000s. The block has FRM walls.

Here is the press release. I screen shot some of it, but the rest is in this link.

In reply to Slippery :

As is Jaguar They are forged of the same metal used in Cosworth Formula 1 engines.    Except pistons. Which are cast.  ( and seriously lighter than forgings) 
 Are you absolutely sure the pistons are forgings.  Because of the greater expansion rates of forging over castings. There will be a noticeable piston slap on a Forging that isn't there on a casting.  
    Some of the modern casting process allow remarkable strength , approaching forgings.  

In reply to Slippery :

Yes you are right they are forgings!!   I wonder what they weigh?  

Slippery said:

frenchyd said:

In reply to Slippery :

 

   So obviously Honda's piston speed would be much high than Jaguars. 
 While the Jaguar's piston size  would make it heavier than Honda. 
    Am I correct in assuming the S2000 has a cast piston?   ( I can't imagine new Honda owners putting up with the piston slap of a forging).  

Rods/Pistons/Crank are all forged on S2000s. The block has FRM walls.

What are FRM walls?   

frenchyd said:

Slippery said:

frenchyd said:

In reply to Slippery :

 

   So obviously Honda's piston speed would be much high than Jaguars. 
 While the Jaguar's piston size  would make it heavier than Honda. 
    Am I correct in assuming the S2000 has a cast piston?   ( I can't imagine new Honda owners putting up with the piston slap of a forging).  

Rods/Pistons/Crank are all forged on S2000s. The block has FRM walls.

What are FRM walls?   

Fiber Reinforced Metal

frenchyd said:

In reply to Slippery :

Yes you are right they are forgings!!   I wonder what they weigh?  

F20 = 350 grams
F22 = 330 grams

In reply to Slippery :

   Thank you  .

     The Jaguar liners are some sort of high wear resistant steel   I've seen engine with very high miles and almost no measurable wear.   I don't know if that's because of the 70 mm stroke  or some voodoo steel.  I do know you can't break them with a 20 pound sledge hammer.  

Slippery said:

frenchyd said:

In reply to Slippery :

Yes you are right they are forgings!!   I wonder what they weigh?  

F20 = 350 grams
F22 = 330 grams

That's light!!!! My forged Jaguar piston Is 480 grams. But Cosworth  has forgings  100 grams lighter with a better combustion chamber. ( there is no combustion chamber in the head, it's in the piston) 

frenchyd said:

In simple terms If I can achieve that sort of flow...

With two valves they are going to need to be big and the ports to match. The FXX heads are some of the best OEM heads ever cast.

What is your max valve size? Can you get close to the same area?

In reply to Paul_VR6 (Forum Supporter) :

I am quite confused by this engine Frenchy keeps talking about. What engine is it? I thought it had 4 valves/cylinder. 

jaaag v12, heads are flat (heron) 2v/cyl