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Posted: Sun Oct 21, 2007 11:58 pm
by cloughy
zagan wrote:what about boring it out a bit wider,
I don't know what the deal would be with increasing the stroke of a diesel, you'd want as much compression as you can get and sortening the conrod might reduce the compression, I get the impression that the pistion has to be coming up to the deck for the diesel to burn corectly.
Maybe change the surface of the pistions, like hollowing them out a bit or changing the size of the grooves.
Also look into opening up the injector side of the cylinders.
You can also increase the gasket thinkness as well.
This would increase the total amount of air in the engine also giving extra power without any nos etc.
NOS is good but it will only last as long as the bottle is full, that's the main reason for diesels having turbos in the first place it's on-tap power all the time.
might be 4.* at the end of the day but would make more power than a 4.2.
Ahhh, increasing head gasket thisckness and taking meat out of the piston, will decrease compression, good for a turbo
not for what he wants to achieve
Posted: Mon Oct 22, 2007 8:32 am
by tweak'e
90Mav wrote:
but if adding fuel is as easy as turning a screw on the back of the injector pump, the surely extra fuel could be switched resonably easily?
anyone have experiance with adding extra fuel to diesels on a as needed basis? (hopefully without playing with 1500psi pressure)
one way is to use a fuel pump off a turbo diesel and rig pressure/vacuum to a switch to the diaphragm. or replace the diaphragm with a solenoid. so when you turn the nos on you also turn the boost comp on to allow more fuel. that way when you turn nos off the boost comp turns off and limits the fuel so you don't go melting pistons.
Posted: Mon Oct 22, 2007 10:59 pm
by 90Mav
HotFourOk wrote:90Mav wrote:ok im thinking NOS would be a good first step.
i am presuming that more fuel cannot be introduced via a 'wet' system, as it would burn before the main charge?
so the only real option seems to be increasing the fuel delivered by the main injection pump.. obviously this extra fuel is only needed when NOS is activated.. what do you think is the best way to achieve this?
i know the TD42-TD6 nissan engines have electronic injection timing. and that rovers have boath electronic timing and fuelling, i believe the latter is using solenoid injectors though..
but if adding fuel is as easy as turning a screw on the back of the injector pump, the surely extra fuel could be switched resonably easily?
anyone have experiance with adding extra fuel to diesels on a as needed basis? (hopefully without playing with 1500psi pressure)
Doesn't a boost compensator do this kind of thing for turboed diesels.
I thought when the turbo creates pressure in the manifold, the injector pump pumps more fuel into the motor to match the increase in air.
was looking at a friends TD42T pump today and it does have this device, a diaphram thing on top of the pump.. I figure that if i set it up to a regulated air pressure soleniod, i could use this to bring in more fuel for the nos :-) (as i just noticed tweak'e said)
Ok so now i have a half baked plan, i'll move this discussion to the nissan page and try and work on what pump mods need to be done...
http://www.outerlimits4x4.com/phpBB2/vi ... 66#1221566
bu feel free to keep telling me to get a turbo here
