Type 4 rebuild questions Options

[mepstein]

What can I do to rebuild my 1.7 for more HP and torque but keep the original d-jet.

piston and cylinders
crank
camshaft
heads
?

I know I can't change the cam too much but is there one that will do better and still work with d-jet.

I know there is modern FI but I'm not interested. No carbs. I'm not looking for all out HP or dropping 10K on an engine kit. I just want a nice bump in power, if possible, while keeping a stock looking engine.

[Alapone]

Just curious, has anyone built a motor with a 66mm crank and 100 or 101mm or larger pistons, like a short stroke 2.1. Is it possible? what would the characteristics of that set up be>?

[Mark Henry]

Mark (E) I'm doing a similar build right now. 2056, webcam, Hoffman heads, and stock-djet. Not to contradict Mr. Henry (who has a world more experience than I will ever have), but I thought something like this was good for north of 110 hp. Maybe anything less than 200 to Mark (H) just looks like 100-ish (IMG:style_emoticons/default/smile.gif)

I guess we shall see.

No, I consider myself as a realist...I find hany HP claims to be exaggeration, or to be more PC let's say "overly optimistic". (IMG:style_emoticons/default/biggrin.gif)
1.7 djet FI cam with 96mm P&C's and headers, I very much doubt if you could break 100hp.

I do have a set of nos mahle 94mm P&C's. Also have a 2.0 crank. I don't know if either of these will fit or work to improve power. I was hoping to see 100 but I realize the stock 1.7 d-jet has limitations.

Weight reduction (of the car) will also help to increase performance.

Mark the 2.0 piston have a different pin to deck height, by eyeball at least .200". You will find the 1.7/1.8 vs 2.0 rod length to be different a corresponding amount. Even 15% is a huge increase, factor in the weight reduction and it would make a fun 914.

Just curious, has anyone built a motor with a 66mm crank and 100 or 101mm or larger pistons, like a short stroke 2.1. Is it possible? what would the characteristics of that set up be>?

It could be done , but at the dollar level this engine will cost to make good HP on a stock motor it wouldn't give enough reward for the bucks. Again there's no replacement for displacement.