cast iron manifold heat protection (JTD) - Alfa Romeo Forum
You are currently unregistered, register for more features.    
Tuning & Upgrades Discuss performance enhancements for your Alfa Romeo

 2Likes
  • 1 Post By crossshot
  • 1 Post By yan.ko
 
Thread Tools
(Post Link) post #1 of 11 Old 18-04-15 Thread Starter
Status: -
AO Member
 
Join Date: Sep 2014
Location: Germany
County: Bayern
Posts: 557
cast iron manifold heat protection (JTD)

Hi Guys,

first: i don't have a EGT gauge (next month i'm buying one)!

But i have problems with the exhaust manifold (JTD 8V). I think my exhaust temperature is to high. The manifold is warped and whistles very loud (not cracked).

What can i do, to protect the exhaust manifold? Is it a good idea, to use heat wrap tape and/or separate the flanges (like yan.ko)? The opinions about that, are very different.

I drive daily vmax, often for several minutes (~4500 revs). I think this is the problem, but i like vmax :-)

Any ideas?

greetings
Chris
crossshot is offline  
Sponsored Links
Advertisement
 
Status: playing kill by numbers
AO Gold Member
 
Join Date: Feb 2005
Location: Belgium
County: Down in the Park
Posts: 8,786
cut the flanges between the different ports to allow for thermal expansion (different expansion rates for Alu and cast iron)
Cuore_Sportivo_155 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
crossshot likes this.
yan.ko is offline  
(Post Link) post #5 of 11 Old 19-04-15 Thread Starter
Status: -
AO Member
 
Join Date: Sep 2014
Location: Germany
County: Bayern
Posts: 557
Should i use a heat wrap tape? Which one?

I want to use the stock heat protection sheet.

And should i also cut the gasket?
crossshot 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
The heat wrap holds the heat inside the manifold, so its temperature will be higher and more stable.
yan.ko is offline  
Status: -
AO Member
 
DavidAlfa166's Avatar
 
Join Date: Apr 2013
Location: Spain
County: A Coruna
Posts: 401
Great pictures, amazingly helpful!
Is that manifold still uncracked, alive and kicking?
Mine started whistling when cold, no broken studs yet, will flatten the surface and make this mod.

Engine still stock, only mods are egr & swirl off.
I guess it's the 504.000km (313.000miles)
Regards

Last edited by DavidAlfa166; 25-10-16 at 00:06. Reason: GRRRR! The spanish spelling corrector messing it again!
DavidAlfa166 is offline  
(Post Link) post #8 of 11 Old 25-10-16 Thread Starter
Status: -
AO Member
 
Join Date: Sep 2014
Location: Germany
County: Bayern
Posts: 557
I only have driven 6 month with this manifold, but in this time there was no issue.

Now i have wrapped it, too. I have a new engine but. The old engine runs to hot and died. This was also the reason why the exhaust manifold has always warped.

http://www.danverclan.de/media/pics/...v_jtdm_559.jpg
http://www.danverclan.de/media/pics/...v_jtdm_560.jpg
http://www.danverclan.de/media/pics/...v_jtdm_561.jpg
http://www.danverclan.de/media/pics/...v_jtdm_562.jpg
http://www.danverclan.de/media/pics/...v_jtdm_563.jpg
http://www.danverclan.de/media/pics/...v_jtdm_564.jpg
http://www.danverclan.de/media/pics/...v_jtdm_683.jpg
crossshot is offline  
Status: -
AO Member
 
DavidAlfa166's Avatar
 
Join Date: Apr 2013
Location: Spain
County: A Coruna
Posts: 401
Thanks! I guess keeping on for 6 months is a good test for a remapped engine
Sorry about the engine, did you knew the cause? Failed water pump or coolant leak?
Head gasket went on mine, only issue is presurized coolant, holding ok for short trips and keeping and eye to the temp gauge, hopefully I'll be fixing it soon!
Cheers
DavidAlfa166 is offline  
(Post Link) post #10 of 11 Old 25-10-16 Thread Starter
Status: -
AO Member
 
Join Date: Sep 2014
Location: Germany
County: Bayern
Posts: 557
Wrong timing and (probably) damaged valve seats. I had EGTs in the exhaust manifold up to 1000°C (!!!). We try to lower it with software changes but it ends in too much PCP and a Piston is broken.

And 6 month with 1000°C EGT is really a good test :-)

Here you can show all pictures: Fiat Stilo Turboumbau // GTB2056V
crossshot is offline  
Status: -
AO Member
 
DavidAlfa166's Avatar
 
Join Date: Apr 2013
Location: Spain
County: A Coruna
Posts: 401
Ouch... not good!
At least a 8v engine is common and cheap... My old 156 has similar problems, low power, much noise, two melted turbos and broken valve guide. Never knew if was a leaking injector, but the intake made a popping noise, so I guess it could be the valves too.
Crashed it running against a concrete wall, drove over a very dirty part of the road on a close curve... didn't had a chance.

I hope my head is ok, it's the same 20V head as 159/brera , cheap doesn't go on the same line with these!

DavidAlfa166 is offline  
Reply

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

Tags
cast , heat , iron , jtd , manifold , protection

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



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