Gasflow and freeflow on TD42 motor

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jcc
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Gasflow and freeflow on TD42 motor

Post by jcc »

Hi all

I recently bought a 1998 4.2d GL Patrol and up to know I'm very happy. I intend using the vehicle for touring,camping etc off the beaten track and not as much for donga driving etc. I would however appreciate more power on the open road. I prefer the route of increasing efficiency by reducing pumping losses etc; without changing the character of the motor or adding complexity.

Does anyone have experience with freeflow exhuasts and/or gasflowing the head on this motor. What works? What and who should I avoid? I live in Wellington and will obviously look for someone around Cape Town or Bellville area to do the work.

I will appreciate your help.

Regards

JCC
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Re: Gasflow and freeflow on TD42 motor

Post by Kagiso II »

P/M Tour de Frans with this one -- it's right up hi ally
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Re: Gasflow and freeflow on TD42 motor

Post by Grootseun »

Jip Frans is your man in that area
2001 9.4 Patrol DI GRX
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ricster
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Re: Gasflow and freeflow on TD42 motor

Post by ricster »

Yes yes yes.... Speak to Frans.... he is a GURU on the 4.2's
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portal pat
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Re: Gasflow and freeflow on TD42 motor

Post by portal pat »

There is restriction in the exhaust out of the turbo. Source an aftermarket dump pipe that is 3" internal size. Then fit a 3" exhaust with a straight through muffler. You will be amazed at the difference. Get a manual boost control valve (Ebay Aust.), set it at 12lbs. and fit that as well-a simple task. Then fit an exhaust gas temp. gauge and a boost gauge. With these in place it is now safe to find a trusted dyno tuner to tweak the fuel, timing etc. Do not allow the EGT to climb over 550C under load. Good luck.
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Gerrit Loubser
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Re: Gasflow and freeflow on TD42 motor

Post by Gerrit Loubser »

Portal Pat, note that JCC has a naturally aspirated 4.2 diesel patrol and not a turbocharged 3.0 diesel, so most of the complexities and worries that you mention don't apply to his situation :wink: .
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Re: Gasflow and freeflow on TD42 motor

Post by portal pat »

Gerrit Loubser wrote:Portal Pat, note that JCC has a naturally aspirated 4.2 diesel patrol and not a turbocharged 3.0 diesel, so most of the complexities and worries that you mention don't apply to his situation :wink: .
Ah ha! Perhaps the heading should not have read TD42? LOL.
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Re: Gasflow and freeflow on TD42 motor

Post by Grant »

Hi Jacques,



Turbo and Intercooler. This set up works very well. I have a Safari system on my 4.2 diesel with a 3" straight through exhaust (sounds great). Very important to fit a EGT, and add coolent temp as well as oil pressure and temp.After fitting a bigger radiator the engine also runs much cooler.
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Re: Gasflow and freeflow on TD42 motor

Post by ricster »

The TD42 thing is confusing for us here too Pat. I know that from 1998 to beginning 2000, here in South Africa, we have only ever gotten the non turbo version of the 4.2 Diesel but still the motor is called a TD 42... :think: .... My Patrol and many others have the turbos fitted aftermarket. Grant for example has the Australian import ST 4.2 diesel, which if I'm not mistaken was designed to accommodate a turbo. Again forgive me if I'm wrong, this is the 4.2 with the silver tappet cover, which I think is the standard TD42 for you guys over there. The N/A version we get here ( black tappet cover ) is bullet proof even with the aftermarket turbo fitted, but with a gentle right foot to control the EGT's. I think the heads we get/have here are slightly different to your turbo versions too.

Unfortunately they went over to the 3.0 TD in 2000...... :rolleyes:

Ahhhh,,,, but like my mate Grant says..... you can't beat cubic inches !!!! ..... LONG LIVE THE 4.2 DIESEL !!!... :thumbup: :thumbup:
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Cedric
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