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[Datsun 1200 encyclopedia]

Exhaust Piping

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Category: Exhaust System

The Datsun 1200 used a 1-1/2 inch exhaust system. The cast iron exhaust manifold has a flat two-bolt flange. A built-in bulge of the pipe was used to seal to the exhaust pipe, which extended past the rear axle. Finally a very, very quiet muffler with a short tail pipe was suspended by two rubber rings. The factory Datsun 1200 muffler was so quiet you couldn't hear the engine at idle.

Contents

Overview

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Terminology

Exhaust Pipe, Muffler, Tail Pipe
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Exhaust Manifold and Exhaust Pipe
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Exhaust insulators: Rubber tailpipe hanger, Ring muffler hangers
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Original mufflers came with integrated exhaust pipe - Bottom (old) is the factory piece
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B210 is similar: 20100-H5000
th_20100-H5000-2.jpg th_20100-H5000-3.jpg th_20100-H5000-1.jpg

A12GX exhaust from A12GX Engine (twin carb) models used a quieter exhaust with a small resonator as well the regular muffler:
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Notice the GX also used a cast header with dual outlets -- See Exhaust Manifold
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In addition the rubber hangers at the very end of the pipe and the muffler rubber hangers, B310 used a solid hanger at the end of the transmission:
th_DSCF4058_.jpg

Factory muffler: B110, B110A, PB110, PB110A, B110 GX, B110 GXA, B110 GX5
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Sizing for Performance

A large diameter exhaust pipe is needed for maximum high-rpm horsepower. However, a small diameter pipe is needed to boost low-rpm horsepower. So you can see that a properly sized pipe -- not too big or too small -- is advantageous.

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Single Exhaust
* Stock 62 horsepower A10: 35mm (~1-3/8")
* Stock 68/69 horsepower A12: 1.5" (38mm)
* A12 GX 83 horsepower: 1.5"
* modded A-series engine: 1.75"
* Max fuel econdomy: 1.5"
* 108 hp engine: 1.75"
* 144 hp engine: 2"
* 185 hp engine: 2.25"
* 232 hp engine: 2.5"
* 339 hp engine: 3"

Of course you can vary this. For example:

  • The larger the engine relative to your car, you can get away with a larger pipe
  • For better street driveability, go a size smaller
  • For drag racing where it is flat-out full throttle, a larger size may work fine

2.5 inch works too, but results in less HP than 1.75 inch pipe
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Although the larger pipe cuts down on low-rpm horsepower, if you have a big engine it's not so bad. Large exhaust increases high-rpm (peak) horsepower slightly while dropping low-RPM hp significantly.

Large pipes with "turbo" type mufflers sound great, but tend to have annoying resonances.
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To solve the vibation & drone problems encounted with straight-through (turbo) mufflers:

  • Change to a chambered muffler which is baffled
  • or, adjust pipe diameter and length, possibly adding a resonator chamber in the middle of the exhaust system
  • OR, cancel out those specific pipe resonant frequencies. For example, if your exhaust drones loudly at 2,500 RPM, add a side branch pipe that is 28" long. It will cancel the drone and leave all other RPMs alone

Options

Chrome tailpipe extension (bell-shaped)

Also see Options

exhaust tube finisher
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Coupe vs. Sedan

coupe muffler
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  • The bends are slightly different.
  • The hanger near the end of the tailpipe (in the photo: where the price tag is) is a different place for sedan vs coupe

Sedan/Coupe/Wagon differ - left: exhaust pipe, right:muffler/tailpipe
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Part Numbers

See Main Article: Exhaust Piping Part Numbers

Truck, Early

To 1978, a single muffler was used.
th_exh_early.jpg

FRONT EXHAUST TUBE ASS'Y
20010-G0002 SB
20010-G1601 SB 7510-8503
20010-G1401 LB
20010-G1611 LB 7510-8503
MUFFLER WITH REAR TUBE
20100-G1003
20100-G1600 7510-7907
20100-G1660 7908-8503 > 20100-G1600

Truck, Mid-model

From 1978 to 1989, a rear resonator was used.
th_exh_mid.jpg

FRONT EXHAUST TUBE ASS'Y
20010-G1900 SB 8504-8910
20010-G1910 LB 8504-8910
MUFFLER WITH REAR TUBE
20100-G1901 8504-8910
20673 CLAMP-EXHAUST TUBE

th_20100-G1901.jpg

Nichira manufacture
th_20100-G1901_.jpg

Truck, Late

From October 1989, a Catalytic Converter was used.
th_exh_late.jpg

FRONT EXHAUST TUBE ASS'Y
20010-95W00 8910-9401
20010-95W02 9402-
MUFFLER WITH REAR TUBE
20100-95W01 SB 8910-
20100-95W11 LB 8910-
20711 GASKET-EXHAUST
  20691-G5100 8910-9401
  20691-51E01 9401-
20711M GASKET-EXHAUST
  20692-02E00 8910-9208
  20692-1E810 9208-
20520 INSULATOR-HEAT, EXHAUST TUBE CENTER LOWER
  20532-95W10 LB
20522 INSULATOR-HEAT, EXHAUST TUBE CENTER LOWER
  20530-95W00 SB
  20530-95W10 LB
20540 INSULATOR-HEAT, EXHAUST MUFFLER
  20540-95W01 SB + LB
20731 BRACKET-EXHAUST MOUNTING
  20720-95W00 SB + LB
20802-G5126 THREE WAY CATALYST 8910- <> 20802-81A26
20624 INSULATOR ASSY-EXHAUST MOUNTING
20630-G1001 ALL (2)
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* fixes muffler to chassis

9401- Front Exhaust Tube (uses 51E donut type gasket)
th_20010-95W02-.jpg th_20010-95W02.jpg th_20010-95W02_.jpg

EXHAUST GASKET manifold-to-pipe
20691-G5100 flat type 8910-9401
20691-51E01 ring type 9401-
EXHAUST GASKET pipe-to-converter
20692-02E00 8910-9208
20692-1E810 9208-
20691-51E01
BECK/ARNLEY 0396441 $3 rockauto.com
FEL-PRO 60905
VICTOR REINZ F31814
* A32B 0601- VQ30DE
* A33B 0499- VQ30DE
* B13 0890- SR20DE
* B15U 0100- SR20DE/QG18DE
* D22U 0898- KA24DE
* L30 0697- KA24DE
* U13U 0893- KA24DE
* WD22 0599- KA24DE

20691-51E01 Steel ring gasket
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Converter

CATALYTIC CONVERTER GASKET
Nissan 20692-M3060
BECK/ARNLEY 0396035
* 720 L20B, Z20/Z22/Z24
* 910 L24E
* B11 E15X/E16S
* N10 A14/A15/E15S
* N12 E16S
* S110 Z20E/Z22E
* S12 CA18ET/CA20E
* S130 L28E/L28ET
* T11 CA20S/CA20E
th_BA0396035.jpg

Muffler

Muffler measurements from my 1200 sedan (original muffler?):

* 11-5/8" Shell length
* 8-1/4" Shell oval width
* 3-3/4" Shell oval height
* 1.5" front inlet, centered
* 1.5" rear outlet, on far left of oval

There is enough room under a sedan that a muffler about 2" longer may fit.

Nissan JDM Catalog
* 20010-H1000 TUBE ASS'Y-exhaust, front - ALL (exc. GX, Automatic)
  19077.jpgAlbum click to view
* 20010-H1020 TUBE ASS'Y-exhaust, front - Automatic
* 20010-H2301 TUBE ASS'Y-exhaust, front - GX 4-speed
* 20010-H3400 TUBE ASS'Y-exhaust, front - GXA (GX Automatic)
* 20010-H7200 TUBE ASS'Y-exhaust, front - GX-5
* 20603-H2300 GASKET-exhaust tube - GX and GX-5
* 20602-27700 NUT-fixing, tube end (2) - ALL (except GX, GX-5)
* 20602-27700 NUT-fixing, tube end - GX-5
* 08915-13810 WASTHER-spring lock (3) - GX-5
* 20635-18000 STOPPER-muffler bound - ALL
* 20100-H1000 MUFFLER ASS'Y-with rear tube - Sedan
* 20100-H1400 MUFFLER ASS'Y-with rear tube - Van
* 20100-H2500 MUFFLER ASS'Y-with rear tube - Coupe
* 20630-18000 RING-rubber, muffler clamp (2)
* 20620-H1000 CLIP-tube, exhaust
  th_20620-H1000.jpg
* 06915-43810 WASHER-plain (2)
* 08915-13810 WASHER-lock
* 08110-85510 or 08110-86010 BOLT
* 08911-10810 NUT
* 20640-18000 STRAP-exhaust hanger
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* 20641-18000 WASHER-plain (2)
* 08911-10810 NUT (2)
* 08915-13810 WASHER-lock (2)
* 08110-82210 BOLT (2)
* 20321-H2500 FINISHER-exhaust - GL, GX
* 20720-N2225 SEALER KIT-exhaust tube joint - ALL
USA Catalog
* 20010-H3100 ASSY-TUBE EXHAUST FRONT Sedan Manual Trans > 20010-H1000 $34.92
* 20100-H7001 ASSY-MUFFLER WITH REAR TUBE Sedan Manual Trans > 20100-H1000 $84.72 NLA
* 20321-H2000 FINISHER-EXHAUST (chrome extension) NLA
* 20321-H2500 FINISHER-EXHAUST (chrome extension) $18.36 NLA

A15E EGI dual exhaust (92 hp)
th_B310_exhaust.jpg

Exhaust Pipe Gasket

See Main Article: Exhaust Manifold#Gasket

Muffler

The muffler should flow at least 2.2 cfm per flywheel HP. For a 69 hp A12, that is 152 cfm

Aftermarket 1.5

  • Dynomax 17700 ("Thrush turbo"),similar shape to stock. Oval 3.25 in. x 7.75 in. Case Length: 11 in. Overall length: 16 in. Width: 7.750 in. Thickness: 3.25 in.
1-1/2 pipe clamps:
* Merit M112 or U112
* Napa BK 7335325
Rubber Donut Hangers
* Merit 8166 ???
Aftermarket GX (is it the same as the S110 gasket?)
* Gasket: Merit 8696
* Pipe: (1981 Nissan 720), Merit 48316
Exhaust Tip - 1-1/2" diameter
* Merit 9821

Aftermarket 1.75

  • Walker Super Turbo WLK-17771
  • Dynomax 17771, 160 cfm
  • WALKER Pro-Fit Muffler, 1.75" offset/center, #17881
  • Magnaflow 11123 with offset. Might be too long, it is 14" body, but it is Stainless Steel, best buy
  • Borla XR-1: BOR-40483 Stainless Steel, 1.75 in, 2.25 out

Search for these using http://google.com or http://www.napaonline.com

Can Muffler

Hot-dog style mufflers (cannons or "fart cans") are mainly for looks. Having the muffler at the very end of the exhaust makes it louder, and most cans are fiberglass packed tubes ("glass-pack") which are by nature noisy. They are simply a straight-through pipe with baffles in the tube sides.

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When fitting a can muffler, it is advised to also fit a large normal muffler under the car.
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Arms

http://www.arms-eng.com

ARMS - stainless side tubes to fit 1200 ute. Volume 94db. Main pipe φ50, tail end φ50 (2" pipes). Dual slash cut or straight cut.

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Nismo

"FISCO" and "NISMO" was fitted to Sunny Truck with A15

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Extractors

See Main Article: Headers

System

David Vizard says exhaust pipe diameter makes a significant difference.
In practice though it is better, especially for a street-driven machine, to have pipes a little too small rather than a little too big. If the pipes are too large a fair chunk of torque can be lost without actually gaining much in the way of top-end power.
More interesting is about the tuned-header and collector lengths:
on a well-tuned race engine ... the exhaust system draws on the intake port as much as 500 percent harder than the piston going down the bore...the exhaust is the principal means of induction, not the piston moving down the bore.

Vizard recommends a sized extractor and a resonator box placed at the correct length. Then after the resonator it doesn't matter how long the exhaust pipe is or what muffler type is used (open chamber or glass pack). Without a resonator the type of muffler makes a huge difference on horsepower.

  • For racing, don't worry about equal length extractors, it's a waste of time.
  • For a downdraft induction system, don't mess with the length of the extractor primaries
  • The collector length is where you should concentrate your efforts
  • At the end of the collector length fit a large expansion chamber (pressure wave termination box)
  • The chamber should be 8 to 15 times the volume of one cylinder (larger is better). For an A12 this works out to about 3 liters.

Collector Length:
Pick an appropriate length from the collector. This makes a huge difference on high overlap camshafts and not just a "dyno difference". There is no "correct length" for all A12 engines. It depends on how you build the engine. What cam do you have? Where do you want the max HP to occur? Via the length you can shift the power band somewhat.

Having a proper length (long) collector can provide a lot more HP while in the power band. Up to 22% more. So it's definitely worth doing.

Discussion by jmac: Extractor selection

Long collector
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Stock collector
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Finish Mufflers

Add these at the end of a full exhaust system.

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rotary style dumpy
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straight-through "cannon" muffler (a straight pipe, peforated with holes and fiberglass-packed chamber) is VERY loud
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Bush Mufflers

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Turbocharged

2.5" off turbo for about 2" then 3" all the way all mandrell bent a straight through offset centre muffler and a resonator at the rear with a 3.5" tip
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