I'm going to repeat something I've said before, why don't you go talk to some professional head porters if you want a greater understanding.
Hmm . . . okay.
Let's see, I work at a 3 man shop where all we build are mustangs (please flame). The guy who owns the place ports cylinder heads for Brad Brand (700" Outlaw 10.5 car which has gone a best of 6.79 @ 209), Tim Matherly (4.6 2v NMRA/FFW Real Street, been a best of 9.1x @ 141), and numerous local guys. His personal car went a 6.0 ( 1 / 8 ) at 114 on the motor. Plan is to run faster than 5.39, which is what the old car went.
So maybe I don't know anything because it isn't a honda. Or maybe its because my first porting at a honda head only went 227 I and 200 E.
So not only that but I have known Barry at Proline Race Engines for a couple of years now and he does measly heads for Tim Lynch's Outlaw 10.5 (best of 6.66 @ 215) and numerous other race cars given they build a ton of motors and Steve Petty tunes in-house.
Not once did I say it wouldn't work. Not once. You jumped way off the deep end there junior.
No, here is the issue you have had. You imply that since someone online said it couldn't be done, it can't. And here is the major problem, you never once said that these people knew your exact combo and therefore made a blanket statement on the internet. [email protected]
was exactly right, a lot of inexperience people read/sift through honda-tech and if someone on there said to run 12:1 on pump gas with no tuning or research, they would be getting phone calls from kids saying they blew their motors up.
So do whatever you want, run 11.9:1. After last time, I am over arguing on here so I just try to mess with my ebay/junkyard junk and post the results.
Jesus fucking Christ guys, there are actually people outside of this forum who know what they're talking about. Believe it or not.
The compression vs VE thread left a lot of holes:
The rule of all rules is #1. This is the key to understanding compression.
1. If static is already near the detonation limit for the fuel being used, further increases in the static compression may hurt engine output and/or reliability.
With a typical n/a motor, the VE is often not much more than 87-89% (for a bolt-on motor) maybe slightly more for a well-built (heads/cam etc). These types can almost always gain from compression being that the motor cannot fill every last space of its cylinder given that the VE is under 100%. Compression allows an underachieving motor to use its incoming intake charge to the fullest extent. When you are above
100% VE is when reducing combustion chamber size is a bad idea. It is true that you reduce VE when you decrease combustion chamber size because total swept volume is less that it was before.
So, as stated before, without knowing #1, you have no perspective. You have rumors that increasing compression all the time is a good thing and its also a bad thing. The point is, you have to know what your motor is doing now to have any idea of how it will respond.