Heads/Compression ratio ?
Race Director
Joined: Jun 2004
Posts: 13,952
Likes: 706
From: WI
Some links of interest:
Rel3rd 287rwhp/374rwtq with 170 runners Summit/TFS
http://forums.corvetteforum.com/show....php?t=1710557
mrc24x 319RWHP/380 RWTQ 113 heads
http://forums.corvetteforum.com/show....php?t=1735359
Razor89 300 rwhp 380 rwtq 113 heads
mods in sig
I don't think you'll get 400 crank. Let us know how things go!
Rel3rd 287rwhp/374rwtq with 170 runners Summit/TFS
http://forums.corvetteforum.com/show....php?t=1710557
mrc24x 319RWHP/380 RWTQ 113 heads
http://forums.corvetteforum.com/show....php?t=1735359
Razor89 300 rwhp 380 rwtq 113 heads
mods in sig
I don't think you'll get 400 crank. Let us know how things go!
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
In your response to CFI-EFI, the tone suggests you feel he is
being pedantic. Accurate usage of terms is important.
If someone goes under the knife intending to no longer be capable
producing off-spring but had asked for vascular surgery instead
of a vasectomy, then after the procedure he may no longer have
issues with varicose veins but he will still be fertile.
In the same fashion, if he asked to have his heads milled when
he meant that he wanted the valve seats cut, then when the heads
came back from the shop the end result would be different than
he had intended.
I have no reason to doubt that you know the difference between
milling the heads and cutting the seats. Why be exasperated if
someone points out that the wrong term happened to be used?
Edit: changed vericose to varicose.
.
being pedantic. Accurate usage of terms is important.
If someone goes under the knife intending to no longer be capable
producing off-spring but had asked for vascular surgery instead
of a vasectomy, then after the procedure he may no longer have
issues with varicose veins but he will still be fertile.
In the same fashion, if he asked to have his heads milled when
he meant that he wanted the valve seats cut, then when the heads
came back from the shop the end result would be different than
he had intended.
I have no reason to doubt that you know the difference between
milling the heads and cutting the seats. Why be exasperated if
someone points out that the wrong term happened to be used?
Edit: changed vericose to varicose.
.
Last edited by Slalom4me; Dec 11, 2007 at 05:58 PM.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Race Director
Joined: Jun 2004
Posts: 13,952
Likes: 706
From: WI
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by BADDUCK
It would be nice if that head was milled for larger valves.
Oh for God's sake!
Originally Posted by CFI-EFI
Milling heads doesn't affect the size valves they will take. The valve sizes are limited by the bore size (cylinder wall interference) and the center to center distance of the valve guides as the head was manufactured.
RACE ON!!!
RACE ON!!!
RACE ON!!!
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Using the same DTL factor, mrc24x's 312 RWHP becomes 390 CHP.
(Note that his engine has the PM rods. Also, my vote is that the TF heads
have a leg up in terms of capacity over his TPiS D113 heads.)
Drivetrain loss values for RWD cars range between 17-24%. Variables
like A4/M6, condition, set up & ect will affect where a particular vehicle
lies within the range.
.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
What is THAT all about? The only way milling can affect valve size is if too much is taken off and they cut into the valve seat, ruining the head or reducing the size of the valve that could have been fitted. Are you disputing that? What is the purpose of your post?
RACE ON!!!
RACE ON!!!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
What is YOUR problem??? I didn't call names or make assumptions. I merely made the simple comment to the statement, "It would be nice if that head was milled for larger valves." that milling heads doesn't allow for larger valves. A large segment of this thread is about combustion chamber size and milling heads to achieve a desired combustion chamber size. Are you saying that I am wrong about milling not allowing for larger valves? If you disagree say so. Don't just have a fit with unproductive comments like, "Oh for God's sake!" and "Obviously the purpose of yours was to be a picky ***. You succeeded, as usual." What IS your problem???
RACE ON!!!
RACE ON!!!
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by jsup
Originally Posted by Slalom4me
Not since we learned about the importance of the quench region.
RACE ON!!!
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
I'll rephrase my earlier answer.
I and people I know used head gasket thickness to lower compression
back in the day. At the time, we didn't know or understand about the
importance of squish or quench distance, all we knew was that premium
leaded fuel was becoming harder to find and we grasped onto what seemed
like a solution that wouldn't require us to pull the engine and invest money
we didn't have in making it able to run on the fuel we could find.
Later I learned about quench and this knowledge helped to explain why
the results of increasing and stacking gaskets on my BBC didn't have
the full benefits I was expecting at the time.
Doubters should pick up a copy of Sir Harry Ricardo's book, "The High-Speed
Internal-Combustion Engine", ISBN-10: 0216890268. You won't find it
readily at Amazon, but it is available from Ricardo Engineering
.
I and people I know used head gasket thickness to lower compression
back in the day. At the time, we didn't know or understand about the
importance of squish or quench distance, all we knew was that premium
leaded fuel was becoming harder to find and we grasped onto what seemed
like a solution that wouldn't require us to pull the engine and invest money
we didn't have in making it able to run on the fuel we could find.
Later I learned about quench and this knowledge helped to explain why
the results of increasing and stacking gaskets on my BBC didn't have
the full benefits I was expecting at the time.
Doubters should pick up a copy of Sir Harry Ricardo's book, "The High-Speed
Internal-Combustion Engine", ISBN-10: 0216890268. You won't find it
readily at Amazon, but it is available from Ricardo Engineering
.
Team Owner
Joined: Oct 2004
Posts: 35,065
Likes: 0
From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
What's so funny? Slalom4me is exactly correct, for those that know or care. Too few understand the principles of, and the potential of, a good quench area. I am one who is guilty of spreading the knowledge. I now regret it, and I won't continue. It is too little understood and too oft ignored. If quench is of no concern, fine tuning gasket thickness can be used to adjust the compression ratio.
RACE ON!!!
RACE ON!!!
I did find all that information informative. Thanks for those who posted.
Team Owner
Joined: Oct 2004
Posts: 35,065
Likes: 0
From: Bergen County, NJ Democrats, doing for the country what they did for Michigan
I just found it amusing that after a long and detailed discussion of quench, it barely fell off the first, maybe second page and it came up again.
When it pretty much never came up before.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
