Reply
 
Thread Tools Display Modes
 
Old 08-11-2013, 06:21 PM   #1
Guru
 
BobH's Avatar
 
City: Montgomery, TX
Country: USA
Vessel Model: None, but looking
Join Date: Feb 2012
Posts: 778
Turbo boost gauge

Does anyone have a boost gauge on their turbo engine? I thought it might be good diagnostic tool especially for twin engine installations comparing the two readings.

Any idea what the max boost pressure might be? I was thinking of getting a couple of gauges for my twin FLs as soon as I can locate a fitting in the intake and figure out what kind of weird British thread it is.

Bob
__________________
Advertisement

BobH is offline   Reply With Quote
Old 08-13-2013, 12:03 PM   #2
Guru
 
Brooksie's Avatar
 
City: Cape Cod, MA
Country: USA
Vessel Name: Island Seeker
Vessel Model: Willard 36 Sedan
Join Date: Oct 2007
Posts: 954
I did hook up the one from my car for a time. My Perkins ran 14psi at WOT same as my turbodiesel car.

Not sure what use it would be.
__________________

Brooksie is offline   Reply With Quote
Old 08-13-2013, 01:01 PM   #3
Guru
 
City: Fort Myers
Country: USA
Join Date: Jul 2013
Posts: 954
Boost guage is nice, know a few friends with them and it can tell if you are having any type of turbo issue/intake blockage, also could be misleading, such as a fuel issue not allowing the engine to spool up would give you low boost but its fuel related. In the end I passed on adding them, basically relying on good maintenance (clean air filters, turbo wash procedure by Yanmar).
Marlinmike is offline   Reply With Quote
Old 08-13-2013, 01:06 PM   #4
Guru
 
BobH's Avatar
 
City: Montgomery, TX
Country: USA
Vessel Model: None, but looking
Join Date: Feb 2012
Posts: 778
I was thinking that by comparing the two under load it might give some early indication of problems developing.

Intrigued by "turbo wash procedure by Yanmar". Could you elaborate or provide a link?

After I posted the message I remembered there was a discussion of boost gauges some time back which answered my questions.

Thanks,

Bob
BobH is offline   Reply With Quote
Old 08-13-2013, 01:16 PM   #5
Guru
 
City: Fort Myers
Country: USA
Join Date: Jul 2013
Posts: 954
I have two spray bottles, one with 8 oz of distilled water with 2 teaspoons of Dawn dish washing detergent and another with just 8 oz distilled water.

While cruising (under-load), over the course of a few minutes I spray the water/soap solution. Then I wait a bit and spray just the distilled water over a few minutes as well.

Yanmar sells turbo wash, and boat yards will do this for you, but its expensive and very easy to do it yourself.
Marlinmike is offline   Reply With Quote
Old 08-13-2013, 01:48 PM   #6
Guru
 
AusCan's Avatar
 
City: Adelaide
Country: Australia
Vessel Name: Kokanee
Vessel Model: Cuddles 30 Pilot House Motor Sailer
Join Date: Jul 2012
Posts: 2,095
Quote:
Originally Posted by BobH View Post
I was thinking of getting a couple of gauges for my twin FLs as soon as I can locate a fitting in the intake and figure out what kind of weird British thread it is.
Bob
I can't help you with the boost on the FL's, but the thread on the fittings are BSP. I expect it is a tapered thread, which would make it BSPT (British Standard Pipe - Tapered)

In the US, fittings are normally NPT (National Pipe Thread)

BSP threads have a 55 degree angled thread cut, vs 60 degrees on NPT threads.

Also - a BSP thread is slightly finer (19 threads per inch vs 18 TPI for NPT) on 1/4" and 3/8" fittings.

To confuse the issue, on 1/2" and 3/4"fittings, both NPT and BSP have 14 threads per inch and appear to be a match but the sealing integrity will be compromised due to the difference in thread angle.

In other words, don't mix them or you'll end up with possible leaks and cross threaded fittings.

By the way guys - BSP aren't weird threads, -Its what the rest of the world has standardised on.

Heres a link for more info.

NPT vs. BSP Pipe | Pipe and Hose
AusCan is offline   Reply With Quote
Old 08-13-2013, 02:23 PM   #7
Guru
 
jleonard's Avatar
 
Join Date: Jun 2008
Posts: 2,739
I always have used Isspro boost gages on my trucks and on one Cummins 6BTA in a boat. They sell what they call the "Turbocator" which is a boost gage and pyrometer combination.
My Cummins 270 made 30 psi of boost. My old {erkins 160 made about 14 psi. Generally speaking you'll get close to 1 psi per 10 engine hp.
__________________
Jay Leonard
Attitude Adjustment
40 Albin
Mystic,Ct. /New Port Richey,Fl
jleonard is offline   Reply With Quote
Old 08-13-2013, 04:37 PM   #8
Guru
 
Brooksie's Avatar
 
City: Cape Cod, MA
Country: USA
Vessel Name: Island Seeker
Vessel Model: Willard 36 Sedan
Join Date: Oct 2007
Posts: 954
Quote:
Originally Posted by jleonard View Post
Generally speaking you'll get close to 1 psi per 10 engine hp.
Interesting rule of thumb...
Brooksie is offline   Reply With Quote
Old 08-13-2013, 04:50 PM   #9
TF Site Team
 
ksanders's Avatar
 
City: SEWARD ALASKA
Country: USA
Vessel Name: LISAS WAY
Vessel Model: BAYLINER 4788
Join Date: Feb 2011
Posts: 3,954
I have both boost and EGT.

They are both great diagnostic tools, as are fuel flow meters.

My engines and others I've seen and worked on produce almost no boost until they get up to 1800 rpm or so.

At a cruise rpm of 1400-1500 rpm there is no boost.
__________________
Kevin Sanders
Bayliner 4788
Seward, Alaska
www.mvlisasway.com
ksanders is offline   Reply With Quote
Old 08-15-2013, 11:37 PM   #10
Guru
 
C lectric's Avatar
 
City: Somewhere
Country: , Canada
Vessel Name: Island Pride
Vessel Model: Palmer sedan 32'
Join Date: Oct 2007
Posts: 1,870
For the boost pressure max this may be one area you will be better served by contacting:
http://www.americandieselcorp.com/

They may even know exactly what you need.
C lectric is offline   Reply With Quote
Old 08-16-2013, 03:49 PM   #11
Guru
 
City: Fort Myers
Country: USA
Join Date: Jul 2013
Posts: 954
It was hit in other posters, the EGT is far more important then boost, together real good diag.
__________________

Marlinmike is offline   Reply With Quote
Reply

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 Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 01:25 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012