NF vs. NG motors

[Dwight & Tina Varnes]

Michael Gough wrote:

> Hey everyone,
> I was wondering if anyone can tell me all the differences between the NF and NG code engines. Is the only thing different the intake manifold and where the injectors go?

Beats me what the difference is. One is for the 87.5 Coupe GT, the other is a 5ks engine. Since the 5ks went into my CGT trouble free, whatever the differences are must be minor and insignificant.

> Speaking of injectors, will my 4k cis-e injectors plug in to the head/ manifold?

Yes, they go into the head. You have to change the sleeves/injector shrouds to match the injectors, but these can be swapped around from your old engine.

> Lastly, do both engines have the same cam, and the 40mm valves?

It's been a while since I studied it on the ETKA, but I'm pretty certain they are the same in that regard.

> Which is better to swap into a 4k? I am going to use my fuel and ignition system and my intake/exhaust manifolds.

Doesn't matter.

> Do these engines have more low end torque than my 2.2 JT?

No, I would not say they have any more torque. Maybe the same or slightly less, seat-of-pants. That was a big concern of mine, especially with the lightened flywheel I used, but it was mostly unfounded. I'm still pleased with the torque.

> Lastly, should I use the whole long block, or just the short block with my head and my 38mm valves?

Use the whole engine. The higher compression you seek comes from the pistons, not the head.

> I would still have the useless vac pump if I used my head

Toss it in the trash where it belongs. I simply plugged the line to the pump and ran just vacuum from the manifold.  Even with four wheel disc conversion on my CGT it has more than enough brake assist; you don't even know it's gone missing.

Dwight Varnes
86 CGT 2.3