show us your pipes : MG Engine Swaps Forum : MG Experience Forums : The MG Experience

show us your pipes #1
mansep2 Paul Mansell Nanaimo, BC, Canada 1973 MG MGB	Posted: July 27, 2012 11:52AM Registered: 4 years ago Posts: 353

Seen the odd pic here on how some of you have had an exhaust built for your V6 conversion, finding it tough to find many pics though.

So show us your pipes especially if it is of the underside with it installed. Looking for ideas to use when the time comes.

1973 MGB, restoration while maintaining drivability

I own an MG............Lots of fun and frustration........Just can't beat it.

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Re: show us your pipes #2
Keith Tanner Grand Junction, CO, USA 1966 Cadillac Sedan Deville Hardtop 1967 Land Rover IIa 88" "Basil" 1972 MG MGB GT "Nigel Brimstone" 1977 Austin Mini "The Terrier" 1994 Mazda Miata "The Targa Miata" → more	Posted: July 27, 2012 12:43PM Registered: 5 years ago Posts: 223

Well, it's an 8 and not a 6. But just in case it's useful.

Here's how the pipes pass through that transverse rail under the floor.

Keith Tanner
SlowCarFast.com

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Re: show us your pipes #3
1744 Bill Guzman California, USA 1973 MG MGB GT "Green GT" 1974 MG MGB "Punking"	Posted: July 27, 2012 02:25PM Registered: 7 years ago Posts: 4,821

here you go! V6 dual exhaust.

It is our attitude that will determine the outcome

How to advertise on this website

Classic Conversions Engineering MG Classic Conversions V6. Wilwood brake dealer.

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Re: show us your pipes #4
Jim Stabe San Diego, USA	Posted: July 27, 2012 02:53PM Registered: 4 years ago Posts: 1,231

I'm on the second exhaust system and I haven't even started the engine. The first picture is the dual system. I replaced that with a single 3" system that sits up inside the tunnel so there is nothing hanging down below the pinch weld. A couple areas required making ovalized pipes to maintain the ground clearance.

Jim

"If you want me to agree with you then we would both be wrong"

'66 MGB widened 11" with LT1 Chevy and 6 speed, C4 Corvette suspension
Pictures here Part 1 http://forum.britishv8.org/read.php?13,7581
Continued in Part 2 http://forum.britishv8.org/read.php?13,22422
Continued in Part 3 http://forum.britishv8.org/read.php?13,33108

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Re: show us your pipes #5
gow589 G W Evansville, Indiana, USA	Posted: July 27, 2012 03:20PM Registered: 9 years ago Posts: 6,993

Here is how I fabbed my own headers:

http://www.qualityfabparts.com/MGB%20Header.html

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Re: show us your pipes #6
cstrong45 Chuck Strong Bainbridge Island, Washington, USA 1978 MG MGB	Posted: July 27, 2012 03:32PM Registered: 7 years ago Posts: 3,886

What diameter pipe is everyone using?

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Re: show us your pipes #7
Jim Stabe San Diego, USA	Posted: July 27, 2012 04:16PM Registered: 4 years ago Posts: 1,231

In reply to # 2131391 by cstrong45 What diameter pipe is everyone using?

2 1/2" to the junction then 3" the rest of the way back.

Jim

"If you want me to agree with you then we would both be wrong"

'66 MGB widened 11" with LT1 Chevy and 6 speed, C4 Corvette suspension
Pictures here Part 1 http://forum.britishv8.org/read.php?13,7581
Continued in Part 2 http://forum.britishv8.org/read.php?13,22422
Continued in Part 3 http://forum.britishv8.org/read.php?13,33108

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Re: show us your pipes #8
65ELCMO Steve Michaelson Oro Valley, AZ, USA	Posted: July 27, 2012 06:31PM Registered: 1 year ago Posts: 115

In reply to # 2131238 by Keith Tanner Well, it's an 8 and not a 6. But just in case it's useful.

Here's how the pipes pass through that transverse rail under the floor.

Keith, That is a really nice system. Looks clean and I bet it sounds awsome

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Re: show us your pipes #9
dhen Darian Henderson San Antonio, TX, USA 1962 MG MGA Conversion "Mater"	Posted: July 27, 2012 07:09PM Registered: 5 years ago Posts: 517

In reply to # 2131491 by 65ELCMO

Keith, That is a really nice system. Looks clean and I bet it sounds awsome

X2. I'm seriously jealous of your welding skills.

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Re: show us your pipes #10
Keith Tanner Grand Junction, CO, USA 1966 Cadillac Sedan Deville Hardtop 1967 Land Rover IIa 88" "Basil" 1972 MG MGB GT "Nigel Brimstone" 1977 Austin Mini "The Terrier" 1994 Mazda Miata "The Targa Miata" → more	Posted: July 27, 2012 11:49PM Registered: 5 years ago Posts: 223

Thanks guys. If there's anything in particular you want a picture of, I've probably got it somewhere.

Mine's all 2.5", and that's for an approximately 400 hp engine. The fuel tank was centered to give clearance for both mufflers. There are "vortex cones" welded inside the collectors in the headers to drop a few dB. The goal was to make a nice, umm, GT for long trips so I didn't want too much volume. The car's actually a bit too quiet from outside, I'm going to install some cutouts because I'm an immature child.

Keith Tanner
SlowCarFast.com

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Re: show us your pipes #11
TeamEvil / / Gone, /, Kiribati	Posted: July 28, 2012 05:49PM Registered: 1 year ago Posts: 1,443

Do you feel that the Vortex Cones made a significant difference?

I've seen them put in place temporarily at the track, but never permanently used on a street car. They seem like a terrific way of reducing the sound levels without resorting to additional resonators and the like.

Just wondering?

Thanks,

TC

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Re: show us your pipes #12
Duncan Duncan Cowen Vancouver, Canada 1956 MG MGA 1500	Posted: July 28, 2012 09:49PM Registered: 5 years ago Posts: 1,360

I cut up a pair of OEM tubular manifolds from a Ford 3.8l V6, and combined the curves I needed with sections of the OEM Fiero y-pipe (same diameter on the down pipes), to create what I needed for the MGA:

Edited 1 time(s). Last edit at 07/29/2012 10:21AM by Duncan.

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Re: show us your pipes #13
cstrong45 Chuck Strong Bainbridge Island, Washington, USA 1978 MG MGB	Posted: July 28, 2012 10:48PM Registered: 7 years ago Posts: 3,886

Duncan, I have the head pipes from the Firebird donor and was considering the same thing.

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Re: show us your pipes #14
TRIKER john fenner BFE, Miami Fl / ( Cuba), USA 1972 MG MGB "Red Barchetta"	Posted: July 29, 2012 10:33AM Registered: 3 years ago Posts: 1,531

Here is a shot of mine, I did the same thing to the outrigger with heavy wall pipe to gain ground clearance.

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Re: show us your pipes #15
Keith Tanner Grand Junction, CO, USA 1966 Cadillac Sedan Deville Hardtop 1967 Land Rover IIa 88" "Basil" 1972 MG MGB GT "Nigel Brimstone" 1977 Austin Mini "The Terrier" 1994 Mazda Miata "The Targa Miata" → more	Posted: July 29, 2012 10:29PM Registered: 5 years ago Posts: 223

In reply to # 2132164 by TeamEvil Do you feel that the Vortex Cones made a significant difference?

I've seen them put in place temporarily at the track, but never permanently used on a street car. They seem like a terrific way of reducing the sound levels without resorting to additional resonators and the like.

Just wondering?

Thanks,

TC

Hard to say. They're welded into the collectors so I can't really do a before/after. I figured it wouldn't hurt.

Keith Tanner
SlowCarFast.com

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Re: show us your pipes #16
bills Bill Spohn W. Vancouver, BC, Canada 1956 MG MGA 1958 MG MGA Twin-Cam 1962 MG MGA MkII Coupe 1965 Jensen CV8 1969 Lamborghini Countach → more	Posted: August 01, 2012 11:17AM Registered: 8 years ago Posts: 9,156

In reply to # 2132312 by Duncan I cut up a pair of OEM tubular manifolds from a Ford 3.8l V6, and combined the curves I needed with sections of the OEM Fiero y-pipe (same diameter on the down pipes), to create what I needed for the MGA:

Duncan, it doesn't look like you reworked the Fiero crossover much. Are you aware that it contains a huge restriction in it that causes significant power loss in the Fieros? They went cheap when they created these parts and they neck down a lot, just as the stock Fiero exhaust manifolds do (you can get a bout 8 BHP increase by spending an hour with a grinder on the manifolds!)

If you didn't get inside that thing, it might be a nice winter project - cut it open and 'optimize' it.

PS - we must be due for a Squamish run - maybe we can get some of the locals together in a week or two.

On exhausts for the V6, I went single (space is more restricted on the MGA than MGB and there is no big pay off in terms of power by going to a dual system on the V6. A single 2.5" exhaust is adequate for the iron head 3.4 engines.

PS - if you do go dual on the V6 a crossover connection between the banks makes a significant difference (improvement) in sound, aside from any power considerations.

Bill Spohn www.rhodo.citymax.com/carstuff.html
1958 MGA Twincam (race car), 1962 MGA Deluxe Coupe
1969 MGC roadster, 1957 Jamaican MGA
1965 Jensen CV8, 1971 Jensen Interceptor
1969 Lamborghini Islero S, 1988 Fiero GT turbo
2009 Pontiac Solstice GXP Coupe
West Vancouver BC

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Re: show us your pipes #17
Duncan Duncan Cowen Vancouver, Canada 1956 MG MGA 1500	Posted: August 02, 2012 12:40AM Registered: 5 years ago Posts: 1,360

In reply to # 2134937 by bills Duncan, it doesn't look like you reworked the Fiero crossover much. Are you aware that it contains a huge restriction in it that causes significant power loss in the Fieros? They went cheap when they created these parts and they neck down a lot, just as the stock Fiero exhaust manifolds do (you can get a bout 8 BHP increase by spending an hour with a grinder on the manifolds!)

If you didn't get inside that thing, it might be a nice winter project - cut it open and 'optimize' it.

PS - we must be due for a Squamish run - maybe we can get some of the locals together in a week or two.

Bill, I have not reworked the "y" section of the crossover. Is this where the restriction is?

I have hogged out one manifold, but didn't have the time to do the second before assembling the car. That's on "The List!"

And as to a Squamish run, I'm looking for a reason to drive the car! It has brand new tires on it, and I just found several serious issues with the cooling system (now resolved) that need testing. I have two vacations planned this month though, so timing might be tight.

Edited 1 time(s). Last edit at 08/02/2012 11:22AM by Duncan.

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Re: show us your pipes #18
bills Bill Spohn W. Vancouver, BC, Canada 1956 MG MGA 1958 MG MGA Twin-Cam 1962 MG MGA MkII Coupe 1965 Jensen CV8 1969 Lamborghini Countach → more	Posted: August 02, 2012 08:30AM Registered: 8 years ago Posts: 9,156

Yup, they didn't cut away enough of the pipe in the Y. Take a look next time you have it out. And a friend with a rotary bit on a milling machine makes the manifold clean up a trivial job....

Let's set up something for Squamish in late Aug or early Sept.!

Bill Spohn www.rhodo.citymax.com/carstuff.html
1958 MGA Twincam (race car), 1962 MGA Deluxe Coupe
1969 MGC roadster, 1957 Jamaican MGA
1965 Jensen CV8, 1971 Jensen Interceptor
1969 Lamborghini Islero S, 1988 Fiero GT turbo
2009 Pontiac Solstice GXP Coupe
West Vancouver BC

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Re: show us your pipes #19
TeamEvil / / Gone, /, Kiribati	Posted: August 06, 2012 12:43PM Registered: 1 year ago Posts: 1,443

Has anyone run into a low RPM drone with their exhaust set-up?

I never gave it any thought at all until I had to fab up an exhaust for my "donor" Mustang. Just did a quick dual set-up with a randomly placed cross over pipe and it was HORRIBLE below 2,500.

Just wondering before I begin planning out the exhaust for the MGA. I want to run the pipes out of the headers, then a crossover, two close pipes rearward eventually merging in a single pipe and out to tip. Hopefully looking totally stock from outside. A little sacrifice in power, but the 5.0 has plenty to spare. I wasn't the least concerned about a drone until I experienced one. Just TERRIBLE for low speed cruising around.

Sure could use some help.

Thanks,

T

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Re: show us your pipes #20
TXS67BGT Jay Musgrove Savannah, GA, USA 1967 MG MGB GT	Posted: August 06, 2012 08:40PM Registered: 6 years ago Posts: 415

for a v8 but may give you some ideas, started using the stock(that I modified)exhausts then made a set of headers

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