Re: How to Keep the Tourque Low in the Power Band

[T Berk <tberk@mindspring.com>]

Randy B wrote:
> 
> Tosha wrote:
> > > I am planing on building up an Audi 2.0 bubble block (w/ 84 GTI head)
> > > this summer and adding it to my Mk1 Scirocco.  [Finally]
> 
> Scott wrote:
> > There's plenty of torque with this package.
> 
> I agree, you will get pretty good torque from the 8V, my 1.9 isn't a monster
> but she does have a lot of torque.
> Q. Can you actually mount the JH solid lifter head to the 2.0 motor without
> modification?

Yep, Audi 3A Bubble Block. 84 GTI Head. Bolt, bolt. Gonna balance every
damn thing.

> When I had the JH head worked on for the tt1.9, I had a race shop "pocket
> port" the head and shorten the valve guides.
> I have no complaints :) She will pull hard as low as 3200rmp and still pull
> up to 7K (actuall put the tach into the gas gauge once in 3rd @ 7150) 8^]
> Because of the shortened valve guides I was told the head would only last
> about 60K before needing new guides.

Yep, heard this to. Oh well, lots to do while you're replacing the valve
guides.

> This seems like it might be a good time to replace the valves.
> Where can I find more info on the slimmer cross flow valves, are they the
> same dia. as the ones in the big valve JH head.

Dunno. Interesting. Might have to get another head to experiment on.

> I am also considering running a smaller exhaust system (1 7/8) because I now
> have too little backpressure for the 1.9. (Bellvue MS tri-Y header, no cat,
> Autotech 2" exhaust, and a free flow muffler)
> Do you think a slightly smaller exhaust would be an advantage for torque. (I
> really don't drive much above 6500, at least not daily)

In my case will balance a larger Diameter with more things in the flow;
I have a hard fit to match- Old School VW, Low Noise, Non-restrictive,
smoggable, stainless (optimal). Compromises will have to be made but I
think I can get happy.

> What about a lightened flywheel?

Sounds good, I doubt I'll have pull away trouble from the stop sign.

> An adjustable cam sprocket is also invaluable. I had to play with mine for
> awhile before landing on 2 deg adv. She now makes power where "I" want it.

Good one, I'll add this to the list. There are a number of brands, some
easier/longer lasting I think. (clueless)

> Knock sensor ignition? Is this really needed? Would the CR be the same as
> stock (the 2.0) if you run the JH head?

It's going to be a 10:1 block. I _am_ installing KS, I _will_ run 91
octane. M'Kay?

> Could a thicker head gasket be used to lower it?

But WHY?

> Seems 10:1 would be fine with 92oct gasoline if you are running an oil
> cooler.

I have a thermo oil cooler mount ready to go, inc. _one_ braided hose
but it's currently missing the cooler itself and another hose. Gonna go
this way instead of the OEM oil to water cooler. (Failure prone over the
long haul)

> I am running 9.7:1 with 15 initial/32 final (<IIRC) with an oil cooler and
> have only had predetonation with 87oct at WOT in 5th.
> I do plan on installing the full-throttle fuel enrichment (had it on my old
> Cosmos-JH and there was a noticeable difference)
> Porting the intake plenum and runners? Why not use a VW Fox plenum?

Yep, gonna run the Fox intake. I like the 5th injector on the end in the
stock location. Retro fit is not hard, just need to tap new threads for
the two screws.

> I actually had to have the intake runners on the head enlarged to match port
> the Plenum/head.
> The VW Fox manifold already has a larger plenum, larger dia runners and
> longer runners than the Rabbit/Scirocco setup.
> The Audi 5K TB is a direct bolt on to this plenum.
> I totally agree on the G-grind although I have been thinking about
> experimenting with other cams for my motor.
> If you could get enough torque out of the motor wouldn't the FF be the ideal
> transmission?

That's been my plan. Fix it with torque. Hey I might have to copyright
that. (dibs!)

> With about 20 more hp I think it would be perfect with my 1.9.
> If I can't find those extra ponies I will eventually have to find a new
> gearbox :(
> 
> > *do this and you'll be able to run a ferocious cam and still lay stripes
> > down the block
> 
> he he, now there is an expensive proposition, :^)

That's what 175r13s are for!  B ])

> 
> Sorry to jump in on this one, but I have been thinking about this stuff for
> awile now.
> Other combo's I have been thinking about:
> Turbocharging the tt motor (Randy at tt sternly steered me away from this),

Don't mess with a good thing.

> Installing the 1.8L G-60 motor (Cost prohibitive and too much down time),

Only if I had a free one laying around.

> Pulling the tt motor in favor of a CIS-Lambda controlled, solid lifter,
> stroked (95.5 X 83) 2.1L 8V.

Nice Q ship, stealth DD.

> (see no reason not to do this except for loosing the uniqueness of having a
> Techtonics built motor)
> Find ways to get more power from the 1.9L without losing it's driveability
> or ability to be smogged.
> (What I have finially decided to pursue)
> Thanks,
> 
> Randy
> 81 Scirocco S (X2) - "The Twins"
> --

Raaaandy, you've been thinkin again.  :)

TBerk

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