Hi, I am trying to improve a flat spot that I have from 1500rpm - 2000rpm. TB42 Petrol only.
I have new plugs, points, timing is at factory standard - 10 I think.
Today I have put Pacemakers and a 2 1/4 sustem on it.
Would it be worth putting it on a dyno and get a good tune?
What are the causes of this happening normally?
Ignition
Timing
Carby?
Cheers
Eric
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Flat spot
some things you could try are:
1. close the plug gap a bit maybe .1 or .2 mm. I had a car that i increased gap by .2 and in the top rev range it went hard but had trouble idling,would often stall.
2. adjust timing manually.Fuels aint what they used to be.try advancing and retarding the timing a bit and see what happens.You could put an alignment mark so you know where you started from
3. is the air cleaner restrictive.Im unsure of the setup for a petrol patrol
But remeber if you fit a bigger exhaust you have to loose some power somewhere ussually.everything is a comprimise.
These couple things wont cost anything so i would try these first.Good Luck
1. close the plug gap a bit maybe .1 or .2 mm. I had a car that i increased gap by .2 and in the top rev range it went hard but had trouble idling,would often stall.
2. adjust timing manually.Fuels aint what they used to be.try advancing and retarding the timing a bit and see what happens.You could put an alignment mark so you know where you started from
3. is the air cleaner restrictive.Im unsure of the setup for a petrol patrol
But remeber if you fit a bigger exhaust you have to loose some power somewhere ussually.everything is a comprimise.
These couple things wont cost anything so i would try these first.Good Luck
Check to see if the advance is working correctly, the transition from vaccum to mechanical advance may not be working correctly (broken spring & the like).
Nissans can carbon the jets & as Bazzle said it might not have a smooth transition into the main jets. This can be rectified a number of ways. I have had good results with slightly increasing the primary main jet sise to slightly increase the mixture.
Before you get int doing this though you need to make sure your ignition system is spot on & there are no vacuum leaks.
Nissans can carbon the jets & as Bazzle said it might not have a smooth transition into the main jets. This can be rectified a number of ways. I have had good results with slightly increasing the primary main jet sise to slightly increase the mixture.
Before you get int doing this though you need to make sure your ignition system is spot on & there are no vacuum leaks.
Don't ask me, ask them. I'm just runnin for my life myself.
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