Topic: Nitrous

[afkrejci90]

So I'm wondering what is needed besides what I already have to use a NO2 setup for trips to the track.  Forged pistons and Carrillo rods I already have, along with an APE lightened crank, is there anything more that I would need to strengthen the bottom end?  Will the CB750 even hold up with NO2?

[Sam Green Racing]

I don't see why not when you consider what has been pumped into them in the past.
It's not going to last as long as a motor on just gas but who knows how long?
It's normally the top end that takes the bunt of it from what I've heard.
Start with low % ages.

Sam.

[afkrejci90]

It's mainly going to be street with the occasional trip to the track each year, so the amount of abuse will be kept a minimum.

[Jerry Rxman Griffin aka MuthaF'er]

What size pistons?

How about top and bottom end studs.

[BLUE71TURBO]

 Don't forget real good valve springs and heavy duty case and cylinder studs. Also you will need to run a copper cylinder head gasket along with having your cylinders " O " ringed with copper wire. Nitrous Oxide can be real fun but any disruption in the delivery of the fuel " gas " side of the system will create a melt down bomb between yer legs.     Special filters are needed for both sides of the system so that the solenoids super small orifice's don't get plugged.   

[afkrejci90]

72mm pistons with the APE studs.  The head will have the works, springs, valves, etc.  Do you have anymore info about the copper wire "o-ring" I've never heard of this before.

[dragracer]

72mm pistons with the APE studs.  The head will have the works, springs, valves, etc.  Do you have anymore info about the copper wire "o-ring" I've never heard of this before.

Basically a shallow grove is cut around the circumferance of the top of the liner in the cylinder. A thin wire, steel or copper is inserted in this grove. When the head gasket(copper) is torqued down, it bites into the o-ring to form a tight seal around each cylinder to keep compression from leaking past under extreme cylinder loading from boost or nitrous. I think many have success with the MLS gaskets these days versus o-ringing or copper head gaskets. Personally. i'll stick with the tried and true o-ring methods. When i see  the car guys all go to MLS, i might change my mind.

[afkrejci90]

I wonder if anyone around chicago can do that, seeing there's basically no one around here that has no machinery to work on these small engines, but maybe APE?

[joe p]

Fast by Gust did all my work.

[MRieck]

72mm pistons....how large a shot are you going to use? 20 jets on the nitrous side? It will be tough on the primary chains. Are you going to use a progressive feed box?

[afkrejci90]

I'm going to keep it down to a small shot to begin with.  There's already going to be a big performance increase just from the big bore and other mods.  This is just to push that envelope a little further    I guess it wouldn't hurt to run a feed box.

[dragracer]

72mm pistons....how large a shot are you going to use? 20 jets on the nitrous side? It will be tough on the primary chains. Are you going to use a progressive feed box?

Ouch, using 20 on the nitrous side with the traditional 4 spread makes it 24 on the fuel side. Damn, thats over a 50 horse shot.

[MRieck]

72mm pistons....how large a shot are you going to use? 20 jets on the nitrous side? It will be tough on the primary chains. Are you going to use a progressive feed box?

Ouch, using 20 on the nitrous side with the traditional 4 spread makes it 24 on the fuel side. Damn, thats over a 50 horse shot.

That's what I used on my FJ Frank....no progressive box. I broke some clutch parts.