Reply
 
Thread Tools Search this Thread
 
Old 04 September 2016, 13:56   #21
Member
 
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 1,370
Seeing a vacuum in the manifold isn't as daft as it sounds.
A none turbo naturally aspirated engine would see a vacuum in the manifold as the cylinders pulled the induction air in,
If your turbo isn't working and the engine requires more air than the turbo can provide then it is possible to see a vacuum in the manifold
That said I'd expect performance to be down further than your experiencing
Let's wait and see what a new gauge with the correct range has to say
__________________

__________________
beamishken is offline   Reply With Quote
Old 04 September 2016, 14:19   #22
Member
 
Country: UK - Wales
Town: Newborough
Boat name: Donna Joanne
Make: Halmatic
Length: 6m +
Engine: Inboard diesel
Join Date: Aug 2016
Posts: 15
Quote:
Originally Posted by beamishken View Post
Seeing a vacuum in the manifold isn't as daft as it sounds.
A none turbo naturally aspirated engine would see a vacuum in the manifold as the cylinders pulled the induction air in,
If your turbo isn't working and the engine requires more air than the turbo can provide then it is possible to see a vacuum in the manifold
That said I'd expect performance to be down further than your experiencing
Let's wait and see what a new gauge with the correct range has to say
Yes I understand that, only when I take the hose off the intercooler and physically plug with my hand and engine running flat out the pressure is to strong for me to create a seal, but when I take the boost gauge valve off the manifold and and run same rpm I can plug hole very easy.

Will try and take pics of what I'm doing, will keep you posted 😀
__________________

__________________
Atlantis.diver is offline   Reply With Quote
Old 04 September 2016, 15:46   #23
Member
 
Country: UK - England
Town: southampton
Boat name: hydradrive
Make: yamaha
Length: no boat
Engine: sterndrives
Join Date: Sep 2012
Posts: 289
Ford Mermaid Turbo 4 / Pacific 22

You always get negative pressure on turbo engine before the turbo boost .

As beamishken said something isn't right if it's constant negative pressure sounds the like turbo isn't boosting.

Is it exhaust clean out the back ie no black
__________________
yam man is offline   Reply With Quote
Old 05 September 2016, 02:06   #24
Member
 
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 1,370
Plugging the turbo outlet and testing the manifold pressure under load are two entirely different things
The turbo needs to give pressure but also enough volume to maintain that pressure
__________________
beamishken is offline   Reply With Quote
Old 05 September 2016, 02:32   #25
Member
 
Country: UK - Wales
Town: Newborough
Boat name: Donna Joanne
Make: Halmatic
Length: 6m +
Engine: Inboard diesel
Join Date: Aug 2016
Posts: 15
Brilliant info, I understand that it will give negative pressure but on WOT it should be a positive but not much. Iv bought a small gauge off eBay and will confirm the manifold pressure. And take it from there.
__________________
Atlantis.diver is offline   Reply With Quote
Old 06 September 2016, 01:12   #26
Member
 
Country: UK - England
Town: Waterlooville
Boat name: Tickler
Make: Halmatic P22
Length: 6m +
Engine: Inboard Diesel 140HP
MMSI: 235115642
Join Date: Sep 2015
Posts: 246
RIBase
Being the proud owner of a Pac 22 with a Turbo 4, I didn't see any issue with putting more gunge on the manifold.
__________________
GuyC is offline   Reply With Quote
Old 14 September 2016, 15:00   #27
Member
 
Country: UK - Wales
Town: Newborough
Boat name: Donna Joanne
Make: Halmatic
Length: 6m +
Engine: Inboard diesel
Join Date: Aug 2016
Posts: 15
Well I think I found out the problem was, the jubilee clip on the silicon hose off the turbo charger was not holding on very well as there seemed to have a worn thread on it, so when I had a friend drive and I inspected the engine bay, I notice the jubilee clip was opening with the boost from the turbo and was escaping only getting 4psi now I'm getting about 12/13psi on the gauge. Got there in the end guys. Thanks for everything
__________________

__________________
Atlantis.diver is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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




Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 20:19.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.