Notices
Forced Induction Superchargers | Turbochargers | Intercoolers

One or Two BOV's? How to decide?

 
Old 12-07-2018, 08:20 AM
  #21  
9 Second Club
 
Join Date: Nov 2003
Location: Norn Iron
Posts: 12,403
Received 4 Likes on 3 Posts
Default

Originally Posted by LSswap View Post
Here's what scares me without a BOV. 92 mm throttle plate is about 10 square inches. Lets say at 20 psi, you close the throttle. Now you got 20 PSI on one side of the plate and a vacuum on the other side. So let's call it 30 pounds per square inch pushing against a 10 square inch plate or 300 lbs against the plate and shaft.
In theory yes, it's possible a pressure spike might mean even more than that, but the closed blade should be strong and there should be little real strain on the shaft itself. And that's if you choose to fully close the blade at high rpm ( DBW gives you options here )

There are considerations and options all round. It probably does make sense to run a valve, whether one or two ( or more ) is irrelevant as ling as they're sized and positioned to do what you think they need to do. Some may do two purely for aesthetics, rather than actual function etc etc.

But in general, it probably is best to have some sort of escape path for boost on closing or even modulating the throttle at high loads.
stevieturbo is offline  
Old 12-07-2018, 09:20 AM
  #22  
Staging Lane
iTrader: (8)
 
jmac636's Avatar
 
Join Date: Feb 2011
Location: huffman,tx
Posts: 75
Likes: 0
Received 0 Likes on 0 Posts
Default

When I was new to turbos and was building turbo 4 cylinder cars I installed BOVís. Fanboi ****! That was over a decade ago. BOVís are just another place for a leak. You should see the look on peopleís face when I tell them I donít run a BOV. Itís comical that people think you need one.
jmac636 is offline  
Old 12-07-2018, 04:58 PM
  #23  
8 Second Club
iTrader: (3)
 
3pedals's Avatar
 
Join Date: Mar 2007
Location: WPG MB
Posts: 1,929
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by jmac636 View Post
When I was new to turbos and was building turbo 4 cylinder cars I installed BOVís. Fanboi ****! That was over a decade ago. BOVís are just another place for a leak. You should see the look on peopleís face when I tell them I donít run a BOV. Itís comical that people think you need one.
3pedals is offline  
Old 12-08-2018, 03:31 AM
  #24  
TECH Junkie
iTrader: (1)
 
Join Date: Sep 2004
Location: Stockbridge GA
Posts: 3,099
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by jmac636 View Post
When I was new to turbos and was building turbo 4 cylinder cars I installed BOVís. Fanboi ****! That was over a decade ago. BOVís are just another place for a leak. You should see the look on peopleís face when I tell them I donít run a BOV. Itís comical that people think you need one.
You don't need hot water in your house either, but it certainly makes life easier on the more sensitive parts. If you run a manual transmission you need a BOV. If you drive hard on the street with an auto, you need a BOV. The only thing that is fanboy **** is the ones that are specifically designed to make some stupid noise when you let off the throttle. There is absolutely no legit reason to induce a severe pressure spike into your intake tubing every time you lift the throttle. That is just begging to blow some connections apart.
gametech is offline  
Old 12-08-2018, 09:45 AM
  #25  
8 Second Club
iTrader: (3)
 
3pedals's Avatar
 
Join Date: Mar 2007
Location: WPG MB
Posts: 1,929
Likes: 0
Received 1 Like on 1 Post
Default

You can run a BOV if it makes you feel better, but you don't need to....
Just like you don't need ARP rod bolts in a SBE
3pedals is offline  
 


Thread Tools
Search this Thread

About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: