Compression ratio - 8th Generation Honda Civic Forum
8thCivic.com

Go Back   8th Generation Honda Civic Forum > Honda Civic Technical > Forced Induction And Nitrous > Supercharging

Reply
 
LinkBack Thread Tools Display Modes
Old 09-21-2017, 07:21 PM   #1 (permalink)
Junior Member
 
Join Date: Jun 2017
Posts: 25
AnbuFG2 has their car in neutral right now
iTrader: 0 reviews
Compression ratio

I recently acquired a CTE stage 2 for a STEALLLL BNIB and I'm wondering if I were to build an engine on the side what would the ideal compression ratio be for 12psi of boost? I want to stay in the mid 300whp range. I've searched around quite a bit just mostly arguments. I came home to get facts and no bs. I just want to build a motor on the side that will take the abuse and punishment and still be reliable as this is my daily driver ATM thanks in advance guys

AnbuFG2 is offline  
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 09-30-2017, 11:58 PM   #2 (permalink)
Junior Member
 
Join Date: May 2016
Posts: 12
mj112588 just put it into 1st gear on 8thcivic
iTrader: 0 reviews
At mid 300whp range you could probably save yourself a lot of money and just spend more on getting a really good tune and be just fine. The tune is everything. You could have a very expensive built motor and with a bad tune blow it. The tune is EVERYTHING I literally just finished installing my stage 2 CT kit and will be tuning it myself to ensure it is done properly.

mj112588 is offline   Reply With Quote Quick reply to this message
Old 10-02-2017, 12:21 AM   #3 (permalink)
Senior Member
 
Megaman X's Avatar
 
Join Date: Mar 2013
Location: Texas
Posts: 1,403
Megaman X just put it into 1st gear on 8thcivic
iTrader: 5 reviews
Just throw the cte on your current motor make sure you have full exhaust and flashpro and tune it you will be fine and hit your 300 number as stated it's all in the tune and supporting mods might want to add a after cooler and oil cooler if you did not get one
Megaman X is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 10-09-2017, 11:19 PM   #4 (permalink)
Senior Member
 
Join Date: Nov 2011
Posts: 110
123frederikt just put it into 1st gear on 8thcivic
iTrader: 0 reviews
Decreasing the compression ratio lowers the peak cylinder pressure and thus the temperature of the intake charge reducing the chance of engine knock. The ignition timing can then be advanced (particularly at low RPM) and boost can be increased. For heavily boosted motors the compression ratio should be decreased 1-2 points to ~8.5:1, where as for a mildly boosted motor the stock compression ratio (11:1) or 1 point decrease (10:1) should be sufficient.

However there are a lot of factors to take into account including fuel type (91, 93, E85), boost pressure, climate in the area you live, etc. For example I live in Arizona where the weather is nuclear hot, the fuel is oxygenated and only available in 91 octane. I'm building a similar set up (~14PSI) and reducing the compression ratio by 1 point (10:1).

Hope this helps!
123frederikt is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the 8th Generation Honda Civic Forum forums, you must first register.
Please enter your desired user 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:
Insurance
Please select your insurance company (Optional)

Log-in


Thread Tools
Display Modes

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
Okay so I did a compression test and the results are? k20speedstar Mechanical Problems & Technical Chat 4 03-24-2017 01:04 PM
Turbo Kit at k20/k24 Hight compression 13.7.1 G gpinho22 Turbocharging 6 01-18-2017 12:55 PM


All times are GMT -4. The time now is 01:25 PM.



Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
copyright 8thcivic.com - all rights reserved