A baffle necessary? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 10-02-2009, 11:10 PM   #1
Elite Member
Thread Starter
iTrader: (6)
 
Join Date: Sep 2007
Location: CA
Posts: 1,990
Total Cats: 9
Default A baffle necessary?

1) Would it cause alot of turbulence if I didn't use the baffle? My DP is just a single 2.5" tube, no divorcing.

I am going EWG so the flapper will be closed.

2) Any way to close the flapper w/ out welding it shut?
kenzo42 is offline   Reply With Quote
Old 10-02-2009, 11:19 PM   #2
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Chicago (Over two miles from Wrigley Field. Fuck the Cubs. Fuck them in their smarmy goat-hole.)
Posts: 26,318
Total Cats: 1,917
Default

Quote:
Originally Posted by kenzo42 View Post
1) Would it cause alot of turbulence if I didn't use the baffle?
I fail at fluid dynamics, so I won't pretend to give an answer here. However,

Quote:
2) Any way to close the flapper w/ out welding it shut?
Easy. Use a piece of threaded rod or similar, with a clevis-type end, with to draw the wastegate arm shut, just like the canister would in the normal configuration.

Joe Perez is offline   Reply With Quote
Old 10-03-2009, 01:18 AM   #3
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

um if you arent gonna just remove it then just unplug the boost source from the can and it should hold shut pretty damn well.
magnamx-5 is offline   Reply With Quote
Old 10-03-2009, 12:15 PM   #4
!!! NOT CONFIRMED !!!
 
Join Date: Feb 2009
Posts: 53
Total Cats: 0
Default

Quote:
Originally Posted by kenzo42 View Post
1) Would it cause alot of turbulence if I didn't use the baffle? My DP is just a single 2.5" tube, no divorcing.
I would say use it. Cause the baffle is there to hold fluid in place for the suction/supply line to draw from. *Depending on how you drive, drift, drag and what not the fluid would be shifting all over the reservoir and if it sucked up some air that could be bad. Then you could run into fluid lock and all other kind of problems.
WESamiss is offline   Reply With Quote
Old 10-03-2009, 12:31 PM   #5
Senior Member
iTrader: (3)
 
Join Date: Jun 2008
Location: Port Orchard, WA
Posts: 620
Total Cats: 4
Default

Quote:
Originally Posted by WESamiss View Post
I would say use it. Cause the baffle is there to hold fluid in place for the suction/supply line to draw from. *Depending on how you drive, drift, drag and what not the fluid would be shifting all over the reservoir and if it sucked up some air that could be bad. Then you could run into fluid lock and all other kind of problems.

I could be mistaken but I think the OP is referring to the baffle in some downpipes that keeps the wastegate flow from disrupting the exhaust flow... no fluid involved.
I'd venture that if you have the internal WG permanently shut then the baffle isn't particularly needed.
Rennkafer is offline   Reply With Quote
Old 10-03-2009, 12:47 PM   #6
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

The FM3 kit has a threaded boss (like a sensor bung) welded on the downpipe allowing you to run a bolt into the internal gate flapper. Pins it shut.

You could also weld the bitch.
Ben is offline   Reply With Quote
Old 10-03-2009, 01:56 PM   #7
Senior Member
iTrader: (6)
 
Join Date: Sep 2007
Posts: 1,085
Total Cats: 30
Default

Quote:
Originally Posted by Rennkafer View Post
I could be mistaken but I think the OP is referring to the baffle in some downpipes that keeps the wastegate flow from disrupting the exhaust flow... no fluid involved.
I'd venture that if you have the internal WG permanently shut then the baffle isn't particularly needed.
FYI fluid can be any substance that deforms under stress. Any gas is a fluid, most liquids and some solids can also be characterized as fluids as well.
albumleaf is offline   Reply With Quote
Old 10-03-2009, 02:02 PM   #8
meatbag
iTrader: (50)
 
gospeed81's Avatar
 
Join Date: Nov 2008
Location: Houston, TX
Posts: 7,357
Total Cats: 26
Default

Sounds like you've already gone to an external wastegate...so why not reap the full benefits.

Fluid flow at the turbine exit is very important...there is a reason the Tial exhaust housing have the hyperbolic curve on them. Even if you keep the flapper shut you are still leaving an eddy chamber next to your turbine. For what it would take to fab a baffle and weld it to the downpipe flange I would think it would be worth it.
gospeed81 is offline   Reply With Quote
Old 10-03-2009, 02:29 PM   #9
Senior Member
iTrader: (3)
 
Join Date: Jun 2008
Location: Port Orchard, WA
Posts: 620
Total Cats: 4
Default

Quote:
Originally Posted by albumleaf View Post
FYI fluid can be any substance that deforms under stress. Any gas is a fluid, most liquids and some solids can also be characterized as fluids as well.
I realize this... however the person I was responding to was talking about the oil system which is filled with what most non-engineers would consider fluid and I didn't want to get into an overly long explanation about how gases act like fluids etc..
Rennkafer is offline   Reply With Quote
Old 10-03-2009, 02:32 PM   #10
Senior Member
iTrader: (3)
 
Join Date: Jun 2008
Location: Port Orchard, WA
Posts: 620
Total Cats: 4
Default

Quote:
Originally Posted by gospeed81 View Post
Even if you keep the flapper shut you are still leaving an eddy chamber next to your turbine. For what it would take to fab a baffle and weld it to the downpipe flange I would think it would be worth it.
Agreed, but will the hour or so of fab and welding produce any dyno results?
Rennkafer is offline   Reply With Quote
Old 10-03-2009, 03:23 PM   #11
Senior Member
iTrader: (6)
 
Join Date: Sep 2007
Posts: 1,085
Total Cats: 30
Default

Quote:
Originally Posted by Rennkafer View Post
I realize this... however the person I was responding to was talking about the oil system which is filled with what most non-engineers would consider fluid and I didn't want to get into an overly long explanation about how gases act like fluids etc..
Sorry.. inner ChemE can't shut the **** up
albumleaf is offline   Reply With Quote
Old 10-03-2009, 03:35 PM   #12
meatbag
iTrader: (50)
 
gospeed81's Avatar
 
Join Date: Nov 2008
Location: Houston, TX
Posts: 7,357
Total Cats: 26
Default

Quote:
Originally Posted by Rennkafer View Post
Agreed, but will the hour or so of fab and welding produce any dyno results?
Only one way to find out...empirical data. And we have a perfect test specimen.
gospeed81 is offline   Reply With Quote
Old 10-03-2009, 03:43 PM   #13
!!! NOT CONFIRMED !!!
 
Join Date: Feb 2009
Posts: 53
Total Cats: 0
Default

Quote:
Originally Posted by Rennkafer View Post
I could be mistaken but I think the OP is referring to the baffle in some downpipes that keeps the wastegate flow from disrupting the exhaust flow... no fluid involved.
I'd venture that if you have the internal WG permanently shut then the baffle isn't particularly needed.
Quote:
Originally Posted by albumleaf View Post
FYI fluid can be any substance that deforms under stress. Any gas is a fluid, most liquids and some solids can also be characterized as fluids as well.

Glass is a liquid. lol Sorry I didnt read his whole post, I just read the guy below his question. So I just answered the best I could.
I work with hydraulics so I just saw baffle and spouted out an answer. haha
WESamiss is offline   Reply With Quote
Old 10-03-2009, 03:55 PM   #14
meatbag
iTrader: (50)
 
gospeed81's Avatar
 
Join Date: Nov 2008
Location: Houston, TX
Posts: 7,357
Total Cats: 26
Default

Quote:
Originally Posted by WESamiss View Post
Glass is a liquid.
I thought this myth was recently busted? And not by the show...

Glass is a crystalline solid structure.

A prof of mine said they found that cathedral glass is thicker at the bottom due to the setting process, and not due to fluid flow over long periods of time.

Found a link:

Is glass liquid or solid?
gospeed81 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Garrett Turbo, 1.8 Oil Pan, & Misc. Stuff nbdooey Miata parts for sale/trade 9 08-30-2017 10:50 PM
Built 1.6l Engine, 1,820 miles Baxgordum Miata parts for sale/trade 19 09-05-2015 12:42 AM
Mahura oil pan baffle Boost Joose Race Prep 13 11-12-2014 08:59 PM
The 4G63T PCV System BogusSVO Engine Performance 24 07-06-2014 08:58 AM
Extra baffling for the oil pan. bbundy Race Prep 75 01-12-2012 04:30 PM


Thread Tools

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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 08:49 PM.