The V8 Owners Forum - Forum Index The V8 Owners Forum -
Welcome to the well-known V8 Owners Forum, no matter what you drive if its V8 Powered you'll be made very welcome.
 
 GarageGarage   1/4 Mile Table1/4 Mile Table 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Rover V 8 + eaton M 90 strange start up

 
Post new topic   Reply to topic    The V8 Owners Forum - Forum Index -> Forced Induction
View previous topic :: View next topic  
Author Message
Steven 90
Helpful or Confused
Helpful or Confused


Joined: 27 Jun 2011
Posts: 105



PostPosted: Sun Jun 18, 2017 11:52 am    Post subject: Rover V 8 + eaton M 90 strange start up Reply with quote

I have fitted a MP 90 to my lpg Land rover 3.5

On first start up it revs to max rpm with the throttle inlet on the M 90 closed , it then loses a bit of rpm and then i can see that the silicone tube just before the inlet manifold get sucks in Shocked Shocked The engine stalls a bit and then again max rpm Rolling Eyes Everytime the tube gets suck in and then expands.

If a measure the pressure @ the inlet manifold i found no pressure and no vacuum, when i measure the pressure on the top of de eaton where the vacuum hose are connected i get 50 KPA i hope this is minus not sure on the megajolt display.
On the tube that gets suckt in i measure about 100 KPA

My eaton is mounted on the top of the engine and runs clockwise, so this should be okay no ?

I have no idea how a silicone tube on the pressure side of a blower can get suckt in at max rpm.
The only thing i can think of is that i have no boost and no idea why.
_________________
Writing English is a bitt of a problem....
Back to top
View user's profile Send private message Send e-mail
Rossco
Moderator Gold
Moderator Gold


Joined: 19 Nov 2006
Posts: 763
Location: Too many to even keep count

2016 Jaguar F Type

PostPosted: Sun Jun 18, 2017 5:22 pm    Post subject: Reply with quote

What LPG system are you using?
_________________
F Type......the new BL Allegro
Back to top
View user's profile Send private message
Steven 90
Helpful or Confused
Helpful or Confused


Joined: 27 Jun 2011
Posts: 105



PostPosted: Sun Jun 18, 2017 5:57 pm    Post subject: Reply with quote

omvl vaporiser modified to boost, the mixer is a simple venturie type.

The simplest system there is.
If i give more-less lpg there is no difference
If i give the mega-jolt 20 degree less advance there is no difference, the engine just wants to gooooooooooo
If it was a normaly aspirated i would say vacuum leak on the inlet
_________________
Writing English is a bitt of a problem....
Back to top
View user's profile Send private message Send e-mail
Eliot
Top Dog
Top Dog


Joined: 18 Nov 2006
Posts: 1723
Location: Milton Keynes


PostPosted: Mon Jun 19, 2017 2:35 pm    Post subject: Reply with quote

some photo's would help us visualise it.
_________________
Eliot Mansfield
5.7 Dakar 4x4, 4.6 P38 & BMW 750i
www.mez.co.uk / www.hptuners.co.uk
Back to top
View user's profile Send private message Visit poster's website
Rossco
Moderator Gold
Moderator Gold


Joined: 19 Nov 2006
Posts: 763
Location: Too many to even keep count

2016 Jaguar F Type

PostPosted: Mon Jun 19, 2017 2:43 pm    Post subject: Reply with quote

Initial thoughts are the boost balance to the vaporiser is not set correctly and vacuum is being applied to the vaporiser which allows fuel in without air.

If that makes sense.

Pictures would really help though
_________________
F Type......the new BL Allegro
Back to top
View user's profile Send private message
Steven 90
Helpful or Confused
Helpful or Confused


Joined: 27 Jun 2011
Posts: 105



PostPosted: Mon Jun 19, 2017 3:20 pm    Post subject: Reply with quote

Rossco wrote:
Initial thoughts are the boost balance to the vaporiser is not set correctly and vacuum is being applied to the vaporiser which allows fuel in without air.

If that makes sense.

Pictures would really help though


yes, i understand, with this line disconected the engine just wont start up. I revs and when it starts up i dies instant.

Pics is a problem, i am thinking about a Facebook link are somthing simple.

grts

Steven
_________________
Writing English is a bitt of a problem....
Back to top
View user's profile Send private message Send e-mail
Steven 90
Helpful or Confused
Helpful or Confused


Joined: 27 Jun 2011
Posts: 105



PostPosted: Mon Jun 26, 2017 3:13 pm    Post subject: Reply with quote

Found it, faulse air being suckt in with the throttle closed.

However now wont the car start up anymore.

I tried with the megajolt ecu of and off a bitt of a backfire however it will not run anymore.

Do i need the vacuum advance to the megajolt ecu on the pressure side off the blower ?
_________________
Writing English is a bitt of a problem....
Back to top
View user's profile Send private message Send e-mail
DaveEFI
Forum Contributor
Forum Contributor


Joined: 26 Feb 2010
Posts: 3783
Location: SW London, UK


PostPosted: Mon Jun 26, 2017 4:09 pm    Post subject: Reply with quote

Surely it should start and idle with the MJ doing nothing - the default EDIS 10 BTDC limp home mode?
_________________
Dave
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
Back to top
View user's profile Send private message
Steven 90
Helpful or Confused
Helpful or Confused


Joined: 27 Jun 2011
Posts: 105



PostPosted: Mon Jun 26, 2017 5:54 pm    Post subject: Reply with quote

DaveEFI wrote:
Surely it should start and idle with the MJ doing nothing - the default EDIS 10 BTDC limp home mode?


I thougt so to, have to say the battery was not full anymore, will charge it and try again tomorrow.

Checked the spark and it was not as blue as normal, so hopping the full battery will give it that more to start.

Before the blower it started perfect, even at minus 18 on lpg.

I got my megajolt program some years ago from a guy and just loaded it, now i have to tune it myself and must say i have one big question. The load on the left side from top to bottem is this going from more to less vacuum ore the other way arround ???
_________________
Writing English is a bitt of a problem....
Back to top
View user's profile Send private message Send e-mail
Steven 90
Helpful or Confused
Helpful or Confused


Joined: 27 Jun 2011
Posts: 105



PostPosted: Thu Jul 20, 2017 10:13 am    Post subject: Reply with quote

It runs !

No longer the throttle in the suction instead in the discharge

New set-up blower -->dumpvalve--> throttle body----> lpg mixer
Only problem it constantly plofs ( backfires) if i giff more ore less throttle it stops.
However will not run on idle. If i disconnect the megajolt it runs worse and more backfire ( harder)

Will be playing with the megajolt now, any ideas ???

grtss

Steven
_________________
Writing English is a bitt of a problem....
Back to top
View user's profile Send private message Send e-mail
Display posts from previous:   
Post new topic   Reply to topic    The V8 Owners Forum - Forum Index -> Forced Induction All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Make payments with PayPal - it's fast, free and secure!


Copyright www.v8forum.co.uk 2006. All Rights Reserved,
Forum Disclaimer: Any posts in the V8 Forum are posted by individuals acting in their own right and do not necessarily reflect the views of the owner, administrators or moderators.