On a street car, good press bends is way over the "good enough" limit. I'm not sure the difference is more then a few HP and you can lose LOTS more by messing up the shape of the system or choise in dampers/mufflers.Mezevenf wrote:This may be true from the cats/collectors and back but the headers themselves need to be mandrel bent.Scott in MN wrote:The owner of an exhaust shop that did work on my 164 claims that mandrel bending is not worth the cost. He races sprint cars and does a lot of work on dragsters and hot rods. He acknowledged that it makes a difference, but claims it is miniscule and not worth it on a street car. His machine results in a smooth bend but ovals the pipe slightly.
Anyway, the cost of getting mandrel bends here is minimal.
Mats Strandberg
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
Well as promised, Daniel and I got together on the week end and had a bit of fun remaking the model for the primaries template.
Now remember, you have to do your homework about internal tube sizes and tuned lengths for your pupose. The point here is just to give you and idea of how to get started.
Tip: the vacuum hose you select should be as cheap and as compliant as possible. It will make the job easier to bend to shape.
When it's done, have some fun with it and not only bend it but twist it too and see that you can make quiete a variety of solutions. It may even inspire you to do other projects.
If you are also thinking of building a collector, you could join it at the primary flange as per the model.
Party time..get your play dough out kiddies..
Endeth part ONE
Now remember, you have to do your homework about internal tube sizes and tuned lengths for your pupose. The point here is just to give you and idea of how to get started.
Tip: the vacuum hose you select should be as cheap and as compliant as possible. It will make the job easier to bend to shape.
When it's done, have some fun with it and not only bend it but twist it too and see that you can make quiete a variety of solutions. It may even inspire you to do other projects.
If you are also thinking of building a collector, you could join it at the primary flange as per the model.
Party time..get your play dough out kiddies..
Endeth part ONE
- Attachments
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- Model components.jpg (235.11 KiB) Viewed 12862 times
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- Manifold in position.jpg (245.54 KiB) Viewed 12861 times
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- Making manifold.jpg (207.77 KiB) Viewed 12862 times
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- Items required.jpg (230.51 KiB) Viewed 12863 times
Last edited by MD on Fri Jun 02, 2006 2:13 am, edited 1 time in total.
Transaxle Alfas Haul More Arse
Starteth part TWO..
Once you cut the holes in your timber manifold faceplate, insert the tube and staple inside to retain it.Three staples is enough. Use some contact glue before hand if you intend to be rough in handling this item later.
BTW. Don't let me catch you even thinking about using real fexible pipe for your actual headers unless you want me come around and smack you on the back of the head with a borrowed KIWI thong for being a bird brain. You need SMOOTH internals man..
That was fun Daniel. Hope it inpsires a few out there to have a go.
As you can see, the V6 does not need a spaghetti weave going around the moon and back to work. It is one of the simplest there is. Don't let anyone charge you the earth to make it.
Once you cut the holes in your timber manifold faceplate, insert the tube and staple inside to retain it.Three staples is enough. Use some contact glue before hand if you intend to be rough in handling this item later.
BTW. Don't let me catch you even thinking about using real fexible pipe for your actual headers unless you want me come around and smack you on the back of the head with a borrowed KIWI thong for being a bird brain. You need SMOOTH internals man..
That was fun Daniel. Hope it inpsires a few out there to have a go.
As you can see, the V6 does not need a spaghetti weave going around the moon and back to work. It is one of the simplest there is. Don't let anyone charge you the earth to make it.
- Attachments
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- Model fitted B.jpg (245.19 KiB) Viewed 12845 times
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- Model fitted A.jpg (244.77 KiB) Viewed 12843 times
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- Kit completed.jpg (241.43 KiB) Viewed 12849 times
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- Kit plan view.jpg (239.16 KiB) Viewed 12849 times
Transaxle Alfas Haul More Arse
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- Platinum
- Posts: 360
- Joined: Thu Feb 24, 2005 12:55 pm
- Location: New York, NY
- Contact:
MD,
is it OK to use another color for my headers.
I tried the blue tubes but they melted. Maybe I need to use thermo-tec but how do I get it inside instead of outside as it normally is?
The new headers are much lighter than the steel ones so this is a big plus!
PS! what type of plastic canister would you recommend as catalytic converter
is it OK to use another color for my headers.
I tried the blue tubes but they melted. Maybe I need to use thermo-tec but how do I get it inside instead of outside as it normally is?
The new headers are much lighter than the steel ones so this is a big plus!
PS! what type of plastic canister would you recommend as catalytic converter
Seriously this is a good idea. But clearence may be an issue if this is not built with the chassis.
When Larry (APE) built headers for the 24V he had just the engine bay of a gtv6 with the 24V in there. Of course being the owner of an Alfa wrecking yard, he has an advantage.
You guys have to remember, even exhaust shops have mandrel benders in Australia. This is unlike any other place in the world, so bends may not be an issue in Australia.
Ah you're all whacked !! Is it any wonder I like you guys.
Micke, I stick with blue cause it goes with the colour of my eyes.
Bazza, I originally did mine in the engine bay and that's when this technique really shines cause you can weave your way around all the stuff in there. That's how I worked out the route past the starter motor that needed some mods to the floor.(remembering I also had to deal with the steering shaft. RHD).
Mats, you can get a whole variety of donut tube of varying radius to make your bends from and just weld them together. I know you know this and you are just having a crack like the rest of the guys. I say this for the benefit of readers who may not know that.
Tupperware -the killer header..
Micke, I stick with blue cause it goes with the colour of my eyes.
Bazza, I originally did mine in the engine bay and that's when this technique really shines cause you can weave your way around all the stuff in there. That's how I worked out the route past the starter motor that needed some mods to the floor.(remembering I also had to deal with the steering shaft. RHD).
Mats, you can get a whole variety of donut tube of varying radius to make your bends from and just weld them together. I know you know this and you are just having a crack like the rest of the guys. I say this for the benefit of readers who may not know that.
Tupperware -the killer header..
Transaxle Alfas Haul More Arse
- Mezevenf
- Platinum
- Posts: 231
- Joined: Sat Aug 13, 2005 2:52 am
- Location: Gold Coast, Australia
- Contact:
This may sound a bit stupid... but where else would you find a mandrel bender if not an exhaust shop? lol.Zamani wrote:You guys have to remember, even exhaust shops have mandrel benders in Australia. This is unlike any other place in the world, so bends may not be an issue in Australia.
I guess we have it easy here.
Bernard M (AKA Mef - Mezevenf)
1986 75QV 3.0L 24v V6 - Silver
1985 GTV6 2.5L 12v V6 - Red
1999 166 3.0L 24v V6 - Red
NightSpec
1986 75QV 3.0L 24v V6 - Silver
1985 GTV6 2.5L 12v V6 - Red
1999 166 3.0L 24v V6 - Red
NightSpec
I don't mean to rain on anyones parade, but has anyone done a dyno comparison of the stock manifolds to the headers/extractors?
Granted I'm new to Alfas, but the stock iron manifolds look to be pretty good as is. I can see a weight benifit to headers, but if the hp gain is only 5hp then it sounds like a really expensive exersise (putting headers on) that comes with a bunch of headaches (heat, clearance, etc.).
just my .02
Scott
Granted I'm new to Alfas, but the stock iron manifolds look to be pretty good as is. I can see a weight benifit to headers, but if the hp gain is only 5hp then it sounds like a really expensive exersise (putting headers on) that comes with a bunch of headaches (heat, clearance, etc.).
just my .02
Scott