jtd diesel cooler? - Alfa Romeo Forum
You are currently unregistered, register for more features.    
Tuning & Upgrades Discuss performance enhancements for your Alfa Romeo

 
Thread Tools
(Post Link) post #1 of 16 Old 29-05-12 Thread Starter
Status: [URL
AO Silver Member
 
Join Date: Oct 2007
Location: United Kingdom
County: Wrexham
Posts: 1,758
jtd diesel cooler?

im sure a few have fitted them any details(pics if any) what was fitted and where and worth doing? or not much benefit noticed?
i know if i pull up pop bonnet and feel fuel rail its hot to the touch, any benefit from lagging rail with exhaust wrap etc
i understand cooling diesel before return to tank to save plastic lines and tanks, but any point cooling fuel supply to pump if rail is already hot from engine temps+higher rail presures.
sussexa is offline  
Sponsored Links
Advertisement
 
Status: no pain, no gain
AO Silver Member
 
yan.ko's Avatar
 
Join Date: May 2010
Location: Czech Republic
County: Moravskoslezský
Posts: 1,951
Garage
Colder-denser is always better, but effectivity of cooling diesel fuel BEFORE high pressure pump is IMHO negligible.

If the fuel is getting hotter than engine compartment temperature, it may be useful to have cooling fins on pipe after CR pump and rail as well. But with the high fuel flow and short travel distance I'm not convinced about the effectivity either.

some topics for hardcore players - peltier cell or dry ice cooling
yan.ko is offline  
Status: no pain, no gain
AO Silver Member
 
yan.ko's Avatar
 
Join Date: May 2010
Location: Czech Republic
County: Moravskoslezský
Posts: 1,951
Garage
looking around for some numbers ...

if you cool down fuel temperature from 50C to 20C, fuel weight will raise by 2%. So it's up to you to resolve if it's achievable and worth doing.

http://www.univ-ovidius.ro/anale-chi...ll/10_nita.pdf
yan.ko is offline  
Status: -
AO Member
 
Join Date: Jan 2011
Location: Portugal
County: Porto
Posts: 157

Member car:

Brera 2.4 JTD

I think the diesel radiator is useful if you drive hard for a long time. Diesel that returns is hot and if you don't cool it it will keep more heat and when it goes into the pump again, it will heat more and more. I've heard of temperatures in fuel going upto 80C on track driving. Cooling this would be useful.
exar1711 is offline  
(Post Link) post #5 of 16 Old 29-05-12 Thread Starter
Status: [URL
AO Silver Member
 
Join Date: Oct 2007
Location: United Kingdom
County: Wrexham
Posts: 1,758
just logged a few power runs wot but short runs, after logged fuel temp(at filter)
max temp at end was still only 26*c and thats about ambient at the moment.
no idea what actual rail temp is but its a lot higher than 26*c, might just try some reflective wrap around rail.
sussexa is offline  
(Post Link) post #6 of 16 Old 02-06-12 Thread Starter
Status: [URL
AO Silver Member
 
Join Date: Oct 2007
Location: United Kingdom
County: Wrexham
Posts: 1,758
tried a thermometer on rail after normal casual driving and it shot off scale(only 42*c)id say its 60*c+ by hand feel, whats interesting is now feeling the incoming fuel pipe from pump to rail is quite cool by comparison(20-30*c)
certainly looks like the fuel rail and outgoing pipes are absorbing the ambient heat from the engine temp.
have bought some heat reflective tape to lag it (keeping away from nuts and fittings though)
looking at the 2x locating bolts and tabs, theres quite a surface area to transmit conductive heat into the rail, do you think its possible to isolate with washer of teflon or laminated phenolic or similar?(thats if i could get one in without upsetting the spacing of the rail and pipes?)
heres a pic of what and where i mean.
Attachment 144819

Last edited by sussexa; 20-02-14 at 20:14.
sussexa is offline  
Status: no pain, no gain
AO Silver Member
 
yan.ko's Avatar
 
Join Date: May 2010
Location: Czech Republic
County: Moravskoslezský
Posts: 1,951
Garage
Interesting. Try to isolate the rail and log fuel temp again.
yan.ko is offline  
(Post Link) post #8 of 16 Old 02-06-12 Thread Starter
Status: [URL
AO Silver Member
 
Join Date: Oct 2007
Location: United Kingdom
County: Wrexham
Posts: 1,758
Fes logging is no good as its in filter, got a infra red thermometer on the way and some tufnol sheet in 0.5mm/1mm/2mm so will lag for now and try insulating when stuff arrives.
When thermometer arrives I'll use feed nuts on injectors and nut on pump exit and fitting for rail sensor as test points for logging.
sussexa is offline  
Status: no pain, no gain
AO Silver Member
 
yan.ko's Avatar
 
Join Date: May 2010
Location: Czech Republic
County: Moravskoslezský
Posts: 1,951
Garage
I know the fuel temperature is measured at the filter, but didn't know you can measure it some other way. Btw the temperature change would be noticeable there as well.
yan.ko is offline  
(Post Link) post #10 of 16 Old 04-06-12 Thread Starter
Status: [URL
AO Silver Member
 
Join Date: Oct 2007
Location: United Kingdom
County: Wrexham
Posts: 1,758
heres a start.

just cable tied some reflective boots over the nuts no sticky.
sussexa is offline  
Status: no pain, no gain
AO Silver Member
 
yan.ko's Avatar
 
Join Date: May 2010
Location: Czech Republic
County: Moravskoslezský
Posts: 1,951
Garage
Any noticeable change on fuel temprature sensed by ECU?
yan.ko is offline  
(Post Link) post #12 of 16 Old 04-06-12 Thread Starter
Status: [URL
AO Silver Member
 
Join Date: Oct 2007
Location: United Kingdom
County: Wrexham
Posts: 1,758
i wont do any logging now untill thermometer arrives.
sussexa is offline  
Status: -
AO Silver Member
 
t3yls's Avatar
 
Join Date: Aug 2007
Location: Manchester
Posts: 2,913

Member car:

Alfa GT Jtdm

Quote:
Originally Posted by sussexa View Post
heres a start.

just cable tied some reflective boots over the nuts no sticky.
its been pimped!
t3yls is offline  
(Post Link) post #14 of 16 Old 04-06-12 Thread Starter
Status: [URL
AO Silver Member
 
Join Date: Oct 2007
Location: United Kingdom
County: Wrexham
Posts: 1,758
almost like a mclaren f1.
sussexa is offline  
(Post Link) post #15 of 16 Old 09-06-12 Thread Starter
Status: [URL
AO Silver Member
 
Join Date: Oct 2007
Location: United Kingdom
County: Wrexham
Posts: 1,758
O.k laser thermometer arrived and checked on a boiling pan of water 98-99c.figures with warm car idling I was getting before and after 1mm tufnol spacer.
Outlet filter=21 after=21
Outlet pump=23 after =23
Inlet rail=38. After=30
Outlet rail=43. After=38
Rocker box=50. After=50
Rail bracket=48. After=36
Injector=50. After=50

It is what it is, cooler yes worth while ?probably not.
1mm tufnol was a squeeze, wouldn't try thicker. And bolts were well tight.
May suffer in winter?it starts off cold anyway.
sussexa is offline  
Status: Deserter...
AO Member
 
Join Date: Apr 2011
Location: United Kingdom
County: North Yorkshire
Posts: 513
As the injectors will be pretty much at the cylinder head temp won't cooling the fuel before it arrives be lost when it gets to the hot injectors?
I use temp guns at work and the laser is usually only to aim it, I assume they work on infra red or similar principals. They also don't work well on all surfaces, a transmission with shiny alloy cases can read 35c when in reality it is about 80c, -as your skin will tell you!
spike60 is offline  
Reply

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Tuning & Upgrades

Tags
cooler , diesel , jtd

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Data Cable and Software Andyg1983 Alfa 147, 156 & GT 25 30-08-10 07:48
Diagnostic software freeware? 156head Alfa 147, 156 & GT 27 18-03-10 14:24
2.4 jtd flatspot bruce Alfa 147, 156 & GT 31 11-05-08 09:08
Bloke fails to get Gore's film banned... Nev Way Off Topic 31 13-10-07 10:21
Alfa159 2.4 JTD wins Diesel class @ Bathurst Oz159 International Motor Sport 1 24-04-07 12:00

Posting Rules  
You may post new threads
You may 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

 
For the best viewing experience please update your browser to Google Chrome