wrapping manifold ? - 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 8 Old 05-12-11 Thread Starter
Status: skint!
AO Silver Member
 
cannotstop's Avatar
 
Join Date: Aug 2009
Location: Ireland
County: Dublin
Posts: 1,493
Garage
wrapping manifold ?

This is one of those "is it worth it" things, that I don't know would fit into the same category of cello-taping over panel seams to improve aerodynamics, or into the category of adding a barn door spoiler to a bicycle to improve traction in corners.
(ie, pointless, or downright silly)

Would wrapping a manifold make any (positive) difference to a non turbo road / slight track car ?
cannotstop is offline  
Sponsored Links
Advertisement
 
Status: 3,75 running great :)
AO Car Of The Year Winner 2015
Membro Medio
 
gotcha's Avatar
 
Join Date: Dec 2003
Location: Slovakia
County: Bratislavsky
Posts: 3,202
We can argue about performance benefits, but in theory keeping the exhaust gasses hot means they are light and fast and flow better. But the main benefit for me would be keeping the temp in engine bay lower thus protecting the wiring from heat that makes cables and plastic fragile over time. Cooler intake temp might be benefit too. Wraping the pipes also makes them stiffer and less prone to resonances so the exhaust note might change as well, its more damped and not so metallic.
gotcha is offline  
Status: 156 3.0 GTAm 1070kg 200kw
AO Silver Member
 
alan Q4+33's Avatar
 
Join Date: Sep 2006
Location: Slovenia
County: -
Posts: 2,020

Member car:

156, 166

Go for it, i wrapped mine on 3.0 gtv. Much lower engine bay temperature and faster gas flow as gotcha has said. I painted mine with silver temperature paint and then wrap them, because some wraps are corosive.

The beauty



alan Q4+33 is offline  
Status: -
AO Member
 
Mozella's Avatar
 
Join Date: Oct 2011
Location: Italy
County: Alessandria
Posts: 204
Quote:
Originally Posted by cannotstop View Post
........ snip...........

Would wrapping a manifold make any (positive) difference to a non turbo road / slight track car ?
Yes......... BUT............. it's hard to say if it's worth it or not.

I used do do some road racing with small, hatchbacks (VW Golf mainly). The rules allowed a few modifications including the exhaust system. Everyone, including me, wrapped the exhaust system, but only as part of many other modifications. As far as I know, dyno data for just exhaust wrapping alone is VERY scarce for obvious reasons. But since I had the engine out more times than I care to think about, wrapping the exhaust fell into the category of not overlooking any potential legal performance improvement, no matter how small. But that was racing, which is different from the real world.

I think most folks would agree that any performance improvement associated with wrapping the exhaust is going to be small. Will you notice it on a street car? Doubtful, in my opinion. It's cheap though.

Problem is, you gotta remove the exhaust manifold. I think I would do the wrapping only if I had the manifold off for some other reason. And I'd do that only after I made relatively inexpensive (and reversible) changes which are more likely to produce genuine performance improvements. I'd first think about stiffer/lower springs, different anti-roll bars, better dampers, improved wheels and tires, strut braces, better intake system, improved exhaust components, better brake components and/or brake cooling, improved driver restraint and/or drivers seat (don't underestimate the performance improvement associated with a good 5 or 6 point harness and a real racing seat), etc. You can expect these changes to make track days a lot more fun.

I would also be concerned about the tendency of the wrap to absorb moisture and cause increased manifold corrosion.
Mozella is offline  
Status: Meh.
AO Platinum Member
 
NineOneSix's Avatar
 
Join Date: Dec 2006
Location: United Kingdom
County: Hertfordshire
Posts: 30,067
Garage

Member car:

GTV V6 3.0

I wrapped mine in my 155, no noticeable difference in performance, but engine bay temp was a lot lower though.

I use a racing seat with a 6 point harness and feedback it gives from the car is amazing
Depends on how far you want to go though.
NineOneSix is offline  
Status: -
AO Member
 
Emanuel's Avatar
 
Join Date: Feb 2006
Location: South Africa
County: Gauteng
Posts: 433
https://www.alfaowner.com/Forum/south...yesterday.html

Mine where ceramic coated, not sure what difference it has made since I have just fitted them but not completed the task yet.
Emanuel is offline  
Status: -
AO Platinum Member
 
Ralf S.'s Avatar
 
Join Date: Feb 2002
Location: The land that Time forgot
Posts: 13,073
I wrapped the manifolds on the 155. The wrap reduced noise from the engine bay marginally (v6) but it also reduced the temperature in the engine bay a little, particularly at the back.

The second bank of cylinders is right up against the bulkhead so I get a slightly cooler cabin in the summer (no air-conditioning in my beast)... plus hopefully it'll give an easier time of it to the starter motor and alternator which are all packed in the back there.

I wrapped the front manifold too for consistency.. but apart from it looks better than the rusty manifold pipe, I didn't notice any hugely beneficial side-effects on the front.

If you have a T/Spark it may be worth lagging the pipe where it passes under the sump.. since that extra heat does (according to legend) bake the big-end for #3 cylinder...


Ralf S.

No bullets for Chaingun..
Ralf S. is offline  
Chris155
Status: - Update
Guest
 
Posts: n/a
I'd again echo the sentiments above, may produce more power but the main gain is cooler under bonnet temps which be fits the longevity of everything else.

It's not a nice job though and you need to ensure thy are wrapped evenly otherwise the manifold can crack due to localised heat spots. This isn't much of an issue on a tspark but on a v6, replacing the rear manifold is fairly laborious.
 
Reply

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

Tags
156 , exhaust , manifold , wrap , wrapping

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



Similar Threads
Thread Thread Starter Forum Replies Last Post
I installed variable intake manifold on 1,6TS gotcha Tuning & Upgrades 35 04-07-19 14:10

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