Outer Limits 4x4 Board

We all complain about it! The TB42 petrol engine is very heavy on fuel.

Our learned colleague "Bogged" will say it's all been tried before and is a waste of time, but contrary to what he thinks there is no reason why good maintenance and performance tuning techniques cannot improve both the performance AND economy of these motors.

I have a 1990 Maverick with 4.2 carby petrol motor. Over the next 6-12 months I will be carefully measuring my petrol consumption BEFORE and AFTER some simple motor work. I will be upgrading the following:

1. The exhaust: fitting a set of 2.5 inch or 3 inch extractors and hi-flow mufflers;
2. The ignition: adding a CDI ignition system, high-energy coil, performance leads and modified rotor button. I will be staying with points however for bush reliability. Why? The CDI system removes the need for high current to flow through the points. The result is that the points should last 50K+ before needing to be changed. And if the CDI fails, I can still get home;
3. Adding a snorkel and opening up the air intake: to increase the volume of cooler air entering the carby;
4. A free-flow performance air filter;
5. Dyno tuning: to get the timing and carby absolutely correct;
6. High performance oil, such as Penrite 15W50;
7. Experiment with the spark plug range: normal, hotter, cooler

At each stage I will carefully check the consumption, and use my best judgement as to whether I have gained economy and/or power.

I would be very interested if anyone has attempted something similar. If so, please share your results.

Cheers

Dave

You can throw a lot of $$ at a TB42 for little improvement. The best thing I did to reducce my fuel comsumption was to lighten my right foot.

Agreed, but I intend to try. Everything can be improved, with not too much $$ spend.

blkmav wrote:You can throw a lot of $$ at a TB42 for little improvement. The best thing I did to reducce my fuel comsumption was to lighten my right foot.

challenger wrote:We all complain about it! The TB42 petrol engine is very heavy on fuel.

But there is no reason why good maintenance and performance tuning techniques cannot dramatically improve both the performance AND economy of these motors.

I have a 1990 Maverick with 4.2 carby petrol motor. Over the next 6-12 months I will be carefully measuring my petrol consumption BEFORE and AFTER some simple motor work. I will be upgrading the following:

1. The exhaust: fitting a set of 2.5 inch or 3 inch extractors and hi-flow mufflers;
2. The ignition: adding a CDI ignition system, high-energy coil, performance leads and modified rotor button. I will be staying with points however for bush reliability. Why? The CDI system removes the need for high current to flow through the points. The result is that the points should last 50K+ before needing to be changed. And if the CDI fails, I can still get home;
3. Adding a snorkel and opening up the air intake: to increase the volume of cooler air entering the carby;
4. A free-flow performance air filter;
5. Dyno tuning: to get the timing and carby absolutely correct;
6. High performance oil, such as Penrite 15W50;
7. Experiment with the spark plug range: normal, hotter, cooler

At each stage I will carefully check the consumption, and use my best judgement as to whether I have gained economy and/or power.

I would be very interested if anyone has attempted something similar. If so, please share your results.

Cheers

Dave

people on patrol list have tried all this over the years, with little or not worthy improvement for the investment.

OK, so what worked and what didn't?
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"...people on patrol list have tried all this over the years, with little or not worthy improvement for the investment."

challenger wrote:Rather than being totally negative, what worked and what didn't.

Please qualify your comments for each suggestion.
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"...people on patrol list have tried all this over the years, with little or not worthy improvement for the investment."

go search the archives.. CBF.

As some members seem to think they own this forum, if anyone else is interested or keen to offer constructive help and/or suggestions, please send me a PM, and we will keep what we learn to ourselves.

challenger wrote:As some members seem to think they own this forum, if anyone else is interested or keen to offer constructive help and/or suggestions, please send me a PM, and we will keep what we learn to ourselves.

would you like a tissue?

Yes please.

Yes please, but would accept a new set of tyres instead.

bogged wrote:

challenger wrote:As some members seem to think they own this forum, if anyone else is interested or keen to offer constructive help and/or suggestions, please send me a PM, and we will keep what we learn to ourselves.

would you like a tissue?

You can be such a tool sometimes Bogged

mkpatrol wrote:You can be such a tool sometimes Bogged

It wasnt a compliment

mkpatrol wrote:It wasnt a compliment

i know

U made him go quiet