Hey all.

I was just watching fifth gear and they where testing nos i was just intrested to see if anyone was using it on there escort and what your views are one it ??


cheers

 

yep

 

but its my fez m8

 

This is what Gav's views on it are

 

Ive used it on lots of cars for about the last 10 years or so.

Never had a failure yet.

Fuck knows how Gav manged that carnage!

 

Standard rods mustn't like it Chip. I'd use it on my car if installed and set up right. Might actaully fit it one day.

 

What sort of shot was he using?

You are going some to fuck a rod like that unless you get something seriously wrong with the tune and det your way up the road playing my dingaling!

 

I think his car was 200BHP with a 50 shot on top.

 

Chip,

As you well know, a NOS shot will increase the torque whilst it is in and it's torque that those standard rods don't like. Lets not forget that the OE RST rods aren't any different to normal CVH that were designed for lawnmower horsepower levels.

 

my mate used to have it in his imperial blue rst van never had any problems that was just a 50 shot too

 

I would be surprised if it wasnt shock loads from detonation or excessive bearing wear that caused that failure rather than just a smooth application of torque.

rods (even weak ones) rarely fail through torque alone unless its a very extreme example, which this application doesnt sound.

 

Chip, I usually suggest that CVH rods are good for about 220-240bhp. If you said that it was making around 220lb/ft at that power, its not hard to imagine making those torque figures at lower engine power with the nitrous.

Whilst I don't disagree with you that rods usually fail for other reasons, lets not forget that these CVH rods are about as weak as rods get and I really believe that at that sort of power, the temps and pressures involved will overcome the rods with even the slightest variance from ideal operating conditions.

 

Rod's that fail under compression dont fail because of a specific torque figure either though, as torque is just an average of the force exerted during the cycle, they tend to fail more as a result of the peak pressures encountered, and that can be controlled (at a slight expense of power) by increased ignition retard.
So i would argue its almost certainly possible to see far more torque safely on the gas than you would expect the engine to make on those components in normal circumstances.

But that said, I totally agree with you that the weaker the rod in the first place, the smaller your margin for error!