Honda Prelude Forum
 
Go Back   Honda Prelude Forum > Tech-Talk > General Tech Talk

Thread Title
The Head Flow Thread

 
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 08-09-2008, 10:28 PM
Si Speed's Avatar
VOID
Photobucket
 
Join Date: Apr 2006
Location: Equestria
Posts: 15,539
iTrader: (39)
Si Speed has a reputation beyond reputeSi Speed has a reputation beyond reputeSi Speed has a reputation beyond reputeSi Speed has a reputation beyond reputeSi Speed has a reputation beyond reputeSi Speed has a reputation beyond reputeSi Speed has a reputation beyond reputeSi Speed has a reputation beyond reputeSi Speed has a reputation beyond reputeSi Speed has a reputation beyond reputeSi Speed has a reputation beyond repute
The Head Flow Thread

We all know the old saying, "Bigger is better." In a nutshell, you think, "Hmm, bigger valves, more air coming in, more exhaust going out, more power for me!" Well, there's a lot more to it than that. In some cases, bigger valves decrease airflow, which is bad. The key to a successful build is precise planning and understanding of what it takes to reach your goal.

For starters, at least with Hondas, virtually everything is restricted from the factory, from exhaust, to air/fuel management, to, well, head flow. When building your head, and doing it right, Depending on your building, different things will be necessary, but this thread is intended to give a better understanding on how to get started with building the head besides just changing out parts.

The first step is, you need to set the proper clearance for the valve guides. I recommend getting new ones while you have the head apart so you know that much won't fail later down the road. CLICK HERE for lots of detailed information on valve guides.

In your valve job, you'll start by porting. This is when unnecessary material is ground away, smoothing the flow paths for the intake and exhaust gases. Every little point in that path restricts the flow of air causing your engine to work harder both sucking in the fuel/air mixture and then pushing out spent exhaust gases. When you rid your head of these nasty ridges and smooth the air flow route, your engine will waste less energy sucking and pushing gases through the system. The amount of porting that should be done depends on MANY variables. Do your research before doing this because every head is different. The point is to have the highest amount of flow for the smallest sized port. You don't want to grind away too much or you risk having a crack and a catastrophic failure. When done correctly and efficiently, along with tuning, a considerably noticeable difference in your motor's performance can be made.

The nest step is polishing. Basically, you just go back and polish the area that was just ported to reduce air flow resistance AKA: drag.


I'll be adding to this thread later, but this is a good stopping point. Any of your gurus have something to add, post it and I'll put it here.
__________________
'94 Prelude Si - SOLD
'98 Prelude - SOLD
'05 TSX -

1200+ Ban Club
Reply With Quote
Reply


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

Posting Rules
You may not post new threads
You may not 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
high flow cat ninety3lude General Tech Talk 40 02-16-2008 09:17 PM
BPI Flow Stack Si Speed Product Reviews 6 11-29-2007 08:06 PM
High Flow Cat Pooponurhead General Tech Talk 4 10-15-2007 12:21 AM
i have a weak flow SandShark General Tech Talk 0 08-23-2007 12:15 AM
new head or no? Str8killa 4th Gen Honda Prelude 7 06-28-2007 08:56 PM


All times are GMT -4. The time now is 06:11 AM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors


Copyright © 2006-2009 PreludeZone.com All Rights Reserved.