Reply
 
Thread Tools Search this Thread
 
Old 07 January 2009, 10:43   #11
Member
 
Simon B's Avatar
 
Country: UK - England
Town: Leicester
Boat name: Vixen
Make: Ribcraft
Length: 6m +
Engine: Suzuki OB 175
MMSI: 235071839
Join Date: Jun 2004
Posts: 1,621
Yep factory fitted V8 1989, the volvo unit has the inlet oultet in wrong orientation, this could be changed!

I love tig, but have struggled a bit with ally welding. Twinning up a monster double sounds a neat idea what did your mate do make one large piece to fit to each end of the two cores held together?
__________________

__________________
New boat is here, very happy!
Simon
www.luec.org
Simon B is offline   Reply With Quote
Old 07 January 2009, 11:59   #12
Member
 
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
we cut the old header tanks off and welded the two cores side by side, then made two new header tanks from 2mm ali plate. Wasnt easy to weld though,
it was difficult to get the ali clean enough. even wire brushing leaves a steel residue that affects the weld quality! its not he prettiest tigging in the world but its airtight!
__________________

__________________
I am usually not as green as i am cabbage looking.
doggypaddle is offline   Reply With Quote
Old 07 January 2009, 14:38   #13
Member
 
Simon B's Avatar
 
Country: UK - England
Town: Leicester
Boat name: Vixen
Make: Ribcraft
Length: 6m +
Engine: Suzuki OB 175
MMSI: 235071839
Join Date: Jun 2004
Posts: 1,621
Cheers Doggypaddle,

Might stick with shoe-horning in a SAAB one they are massive. Good info on flap removal will put that on my list of must do's. Along with pump tweaking not researched this yet but there must info out there.

I did get a free exhaust pipe, which could yield enough pipe to mackle up a replacement section for the middle silencer! Not 3" but a start.

Front mounting of the air filter appears an option, as did externally coupled to a snorkel - I had been drinking! Twin smoke stacks could happen next!
__________________
New boat is here, very happy!
Simon
www.luec.org
Simon B is offline   Reply With Quote
Old 08 January 2009, 15:13   #14
Member
 
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
there will be plenty of room under the bonnet for the air cleaner, as its a V8 there may be room against the bulkhead.
plenty of info available on pump tweaking, its the same as a Bosch VE fitted to many other engines including perkins prima, cummins 5.9 b series, landrover tdi etc. trick is to get the spring under the compensator and the fuel screw set to get a similar amount of exhaust smoke throughout the rev range.
it took a week of driving with the mirror pointed at the tailpipe with mine.
tell you what though, with the wastegate tweaked up to 25psi and no regard for visibility behind, my series 2 would easily leave my mates 4.6 rangerover in a cloud of smoke!
turbo would soon melt like that though
__________________
I am usually not as green as i am cabbage looking.
doggypaddle is offline   Reply With Quote
Old 14 January 2009, 06:50   #15
Member
 
Simon B's Avatar
 
Country: UK - England
Town: Leicester
Boat name: Vixen
Make: Ribcraft
Length: 6m +
Engine: Suzuki OB 175
MMSI: 235071839
Join Date: Jun 2004
Posts: 1,621
Doggypaddle,

Interesting! maybe a touch extreme for me at this point. My interest in lpg had stemmed from the option to in part reduce the clouds of smoke (as well as getting more torque)

The idea is for this to be a daily drive vehicle that would last, I think the Isuzu should blow off at 13psi normally, I dont know what margin is safe to exceed this by, clearly 25psi has been obtained. 3" exhaust is starting to make sense...
__________________
New boat is here, very happy!
Simon
www.luec.org
Simon B is offline   Reply With Quote
Old 14 January 2009, 10:52   #16
Member
 
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
I am not sure whats safe, its the exhaust gas temp you need to watch, may be worth getting a pyrometer if you want to start fiddling.
running high EGTs for long periods melts turbines and cracks wastegate housings as i found out with my perkins 2.0 Prima in the series one.
i ran that at 25psi boost and quite smokey at full chat, and melted the wastegate.
running at 20 psi boost at 5000rpm and the exhaust just whiffing a little smoke its lasted 10 years and over 100000 miles, the toltal milage on the engine is around 220000, but its an oil burner now
I dont have a wastegate on the isuzu. it does not need one, with the smoke at acceptable levels the fuel and small size of the turbo compressor means the boost gets to 20psi at 4200rpm.
the nice thing about the small turbo is that i get boost from a little over 1000rpm, i usually only need 5th gear once i am rolling

you need a big exhaust to get the heat away from the turbo ASAP, it makes a little improvement to the performance if nothing else changes, but then allows higher boost to be run at lower EGTs.
__________________
I am usually not as green as i am cabbage looking.
doggypaddle is offline   Reply With Quote
Old 15 January 2009, 12:48   #17
Member
 
Simon B's Avatar
 
Country: UK - England
Town: Leicester
Boat name: Vixen
Make: Ribcraft
Length: 6m +
Engine: Suzuki OB 175
MMSI: 235071839
Join Date: Jun 2004
Posts: 1,621
Thanks for all this diesel education Doggypaddle, I had theorised correctly about the exhaust, this is good! I believe lpg injection will raise EGT by 50-70 degrees, I assume centigrade. I'd seen forum posters using an EGT to monitor turbo meltdown and stuff.

For now I think I'll content myself with fitting correctly and getting all the old V8 stuff moved about, if convenient fit the intercooler at the same time then move on to more expensive and challeging mods later.

A chap who had run an Isuzu for a while remarked he'd cracked all 4 pistons but did not say how, sounds cooking related!
__________________
New boat is here, very happy!
Simon
www.luec.org
Simon B is offline   Reply With Quote
Old 16 January 2009, 05:24   #18
Member
 
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
Quote:
Originally Posted by Simon B View Post
.

A chap who had run an Isuzu for a while remarked he'd cracked all 4 pistons but did not say how, sounds cooking related!
too much boost and fuel without an intercooler or too small an intercooler.
or more likely the timing way too advanced, usually if overfuelled the turbo will go first. the isuzu ones are good though theyre watercooled.

get it in running standard first then start tweaking later!
standard fuel setting is a bit lame, theres lots of scope for improvement.
__________________
I am usually not as green as i am cabbage looking.
doggypaddle is offline   Reply With Quote
Old 16 January 2009, 06:29   #19
Member
 
Simon B's Avatar
 
Country: UK - England
Town: Leicester
Boat name: Vixen
Make: Ribcraft
Length: 6m +
Engine: Suzuki OB 175
MMSI: 235071839
Join Date: Jun 2004
Posts: 1,621
OK, I'll check back later when it's in, not sure if the pump has been adjusted or not so may have to get back to base settings if it has.

I'm quite looking forward to this, at the end of it I'll have an old chassis failure V8 Stromberg 110 to dump and a V8 engine on SUs. That'll clear up the partners drive way she'll be well happy but this will mean muggins will be laying paving afterwards.
__________________
New boat is here, very happy!
Simon
www.luec.org
Simon B is offline   Reply With Quote
Old 16 January 2009, 12:50   #20
Member
 
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
getting back to base settings is a pump off and a trip to the diesel shop to lighten you a 100 quid or so. and to be honest a waste of time anyway.
once its in and running i can tell you how to get to the right fueling for your set up quite easily, if you run through it systematically.
theres only really 3 settings to adjust and they all affect each other. so you need to do it in the right order, or you will go around in circles!!
all you need is the mirror trained on the tailpipe so you can visibly check how much smoke you put out.
for everyday use its a case of getting the pump set so when you work it hard pedal to the floor there is a tiny bit of smoke at all boost levels and rpm.
PM me when its in or if you need any advice, ive done probably upwards of 20 conversions now, so have a bit of knowlege built up.
__________________

__________________
I am usually not as green as i am cabbage looking.
doggypaddle 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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 23:36.


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