springless heads revolution or disaster? - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #16 (permalink)  
Old 09-29-2008, 11:45 PM
Member
 
Join Date: Nov 2001
Posts: 447
Wiki Edits: 0

Thanks: 0
Thanked 11 Times in 10 Posts
The Renault engine does not use desmotronic cam action to close the valves in their F1 engine. . The valves are of a conventional type and uses a nitrogen bag instead of a spring. The bag pressure is electronically controlled for increase pressure as RPM goes up. Think of it as a small round bag around the stem of a valve which is recessed in a hole in the head. Increasing the pressure in the bag is like increasing spring pressure but with no bounce off the seat at high RPM, nitrogen also aids in cooling. A small feed line increases or decreases pressure , this is computer controlled.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #17 (permalink)  
Old 09-30-2008, 12:18 AM
4 Jaw Chuck's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Mar 2002
Location: Manitoba, Canada
Age: 46
Posts: 5,093
Wiki Edits: 0

Thanks: 2
Thanked 113 Times in 91 Posts
I don't know guys, but heres my idea of the future.

Ceramic Rotary Engine Project

Once you have a 8500 rpm flame belching rotary under your hood that weighs 180 pds and puts out 275HP...you never want to go back.

Hence the Avatar.

Imagine it with a ceramic turbo putting in 30psi of boost...oh yea thats the stuff!

P.S. This one should be able to burn hydrogen with no modifications.

Daddy want!
Reply With Quote Quick reply to this message
  #18 (permalink)  
Old 09-30-2008, 06:53 AM
spinn's Avatar
Reviewing the situation
 

Last journal entry: This makes a huge difference
Last photo:
Join Date: Oct 2004
Location: here
Posts: 2,555
Wiki Edits: 0

Thanks: 14
Thanked 88 Times in 85 Posts
i like wankle rotory type. the simplicity is cunning. however, i dont see many 80-90's rx-7 on the roads these days. i dont think its ready yet? mayybe im wrong.


the common trade in i see, is a honda i4 with 300k miles.
Reply With Quote Quick reply to this message
  #19 (permalink)  
Old 09-30-2008, 01:32 PM
Registered User
 
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 7,084
Wiki Edits: 0

Thanks: 4
Thanked 537 Times in 454 Posts
Quote:
Originally Posted by spinn
i have been following the developement of springless heads. to me, stock spring type heads, the method is too antiquated. by now there is a better way. spring seat pressure can hold your car back , driving around, robbing your low end torque. could a springless head be a step in the correct(not neccesarily, right) direction?

pics coats type..


youtube video idling decuir head
http://www.youtube.com/watch?v=GXIdOTkJhEY

Obsolete, in the next couple years the concept of the mechanically operated valve train will be eliminated. In place will be electrically actuated valves controlled by the computer. The advantage is that cam timing can be varied with engine loading, throttle setting, and RPM. At idle, lift will be low and duration short, at WOT lift will be high and duration long. In between these points will be in-between durations and lifts. The timing points of valve opening and closing will be variable as will LSA, LCA and resultant overlap. The end product will be tremendously powerful engines that are as docile as a lamb at idle, get fantastic fuel economy with very reduced emissions.

This is in the lab as I write and is only "adequate durability" away from production.

Bogie
Reply With Quote Quick reply to this message
  #20 (permalink)  
Old 09-30-2008, 02:19 PM
spinn's Avatar
Reviewing the situation
 

Last journal entry: This makes a huge difference
Last photo:
Join Date: Oct 2004
Location: here
Posts: 2,555
Wiki Edits: 0

Thanks: 14
Thanked 88 Times in 85 Posts
get crackin already.
Reply With Quote Quick reply to this message
  #21 (permalink)  
Old 09-30-2008, 02:46 PM
Rob Keller's Avatar
AKA:"SLOWRIDE66"take it easy!
 
Last wiki edit: How to post pictures on a forum
Last journal entry: 85 Suburban
Last photo:
Join Date: May 2004
Location: Central Florida U.S.A.
Age: 48
Posts: 4,297
Wiki Edits: 38

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by spinn
get crackin already.


LOL!!!








R
__________________
"SlowRide66"

"Illegitimis non carborundum"
Don't let the bastards grind you down!

Crankshaft Coalition Master List of Hotrodding Forums
Reply With Quote Quick reply to this message
  #22 (permalink)  
Old 09-30-2008, 04:05 PM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: Found an LQ9 today
Last photo:
Join Date: Dec 2005
Location: Carlisle, PA
Age: 41
Posts: 5,289
Wiki Edits: 16

Thanks: 18
Thanked 16 Times in 12 Posts
There is a 4 cylinder bike engine in use right now (I think) that uses two cams, one to open and the other to close. Instead of springs, the valve is actively closed by another cam lobe.
Reply With Quote Quick reply to this message
  #23 (permalink)  
Old 09-30-2008, 04:50 PM
4 Jaw Chuck's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Mar 2002
Location: Manitoba, Canada
Age: 46
Posts: 5,093
Wiki Edits: 0

Thanks: 2
Thanked 113 Times in 91 Posts
Quote:
Originally Posted by spinn
i like wankle rotory type. the simplicity is cunning. however, i dont see many 80-90's rx-7 on the roads these days. i dont think its ready yet? mayybe im wrong.


the common trade in i see, is a honda i4 with 300k miles.
I had 275 000 miles on my 12A in a 1981 RX7...until I cracked an apex seal at the track. Bad float in the Holley 650 DP dumped raw fuel from the vent tube during a race (I kept going!) which caused raw fuel to pour from the exhaust during the last 6 laps. Amazingly it ran fine for a few more hours but I guess the seal quenching in flood conditions made it crack.

It still ran on two seals, although it was like a V6 with two cylinders missing. I drove it like that for two more months until I could procure another block for $200.

Not too many engines that will still run strong even with raw fuel from a Holley red pump at full tilt pouring into it. Actually during the race I didn't even notice until when I pulled into the pits and the other guys pointed out the line of gasoline around the track, they didn't even black flag me ha-ha!

The reason why you don't see many ones used is because people run them out of oil, they draw motor oil from the crankcase for the injection. I ran mine on premix but every one I see in the junkyard was run out of oil.

Too bad that keeping oil in a vehicle is so difficult for most people.

Mmmmm...but a ceramic rotary without a cooling system and using gold running surfaces with no injection oil is my idea of fun, make the shortblock $100 to replace and I'll buy at least two!
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
AFR or Vortec heads? Cam? rodent Engine 18 06-08-2010 04:50 PM
SBC Heads -= AFR - Trickflow - Dart - Brodix =- Delirious2000 Engine 25 04-22-2009 01:58 PM
sbc heads shieldbreaker Engine 5 08-27-2005 09:12 PM
Heads and Intake combo black66 Engine 4 07-24-2005 12:33 AM
looking for some head(s) now i'm gonna explode! bullheimer General Rodding Tech 25 04-12-2004 02:16 PM


All times are GMT -6. The time now is 09:48 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.