OK I have bee drag racing for over 35 years and I'm going to try out something new. Want to build a car to run 100 MPH for about 100 miles.
The car will be geared for 3800 RPM in top gear. I have several intake manifolds to pick from so just curious what you guys think ??
Offy
Clifford both water heated and non water heated
Aussie Speed short runner with hi mounting pad
Dutra fat pack

Also have Offy with two, ones ( think too small)
Homemade with three 350 Holley's ( might be to big for this engine)
Homemade Clifford/Hilborn injection ( not much on fuel economy )

So blast away !

Silver State Challenge? Which engine?

_________________
There's no such thing as too much cam....only not enough engine!

I would think the fat pak dave...

I mean they did exactly that in 60-62..

I also have logged many highway miles with a non fat pak dutra manifold at 75 -80 mph solid.


Greg

_________________
http://www.youtube.com/hyperpack

How big is the car?

The right Toad could do it with a Super 6.

A 72 w200 would need the Hilborns.

Hi Dave!

Silver State, I believe.

I think you will want to run some higher RPMs on that course to come through turns and such. 100 MPH will not be hard, but averaging 100 will require higher straightaway speeds to average out the lower corner speeds. So, I believe you are really going to want to make power from 3500 - 6000.

My drag testing and feelings (seat of pants) on street/roadcourse/autoX tell me that the Clifford will start making more power than anything else above about 4000-4500 RPM, so I would use that (non-WH) Clifford. I have run Aussiespeed long and short and did not see much drop in perf at lower RPMS, but plenty of drop above 4500 compared to a Clifford. Aussiespeed long runner is very good at lower (sub 4500) RPMS on a 250 HP motor. I imagine the fat pak will give you great perf up to about 5000 and maybe higher. The runner areas are much bigger than Aussiespeed and probably substantially bigger than Clifford.

The 3X350s might work well, if you can get it to throttle respond. I doubt the Hilborns will have much range to them and will not have good throttle response or recovery.

Offy 2X1 and 4V will be too small. No question. If you had a 3X2 weber or IR EFI setup, I might say use that... Webers might require lots of tuning time and/or are $$$.

How much HP are you trying to make and how heavy/big/tall is the car? What transmission, brakes, chassis, rear axle?

There's a start, anyway...

Lou

_________________
Home of Slant6-powered fun machines since 1988

The recommendations are right down the line Dave. My personal vote would be for the Fat Pak which will give you the ram tuning benefit above 3500 rpm and the runners are as fat as the clifford shorty so no breathing problems there....


Assuming you try this in the 1969 Valiant you have brought to the track, and coupled with one your better built drag mills (but without the 'experimental roller cam'), using a simple 600 cfm carb dialed to your needs, you should have no problem acheiving your goals and doing it on less than 10 gallons of gas...

My last street-able setup with the clifford Hpak and 4.56's in OD would turn about 3000-200rpm at highway speeds, the only issue is the drone long term... I figure you aren't going to worry about it for an hour...

I'm pretty sure my 64 Dart could do this job with about any of the manifolds listed. Manifold will not be a huge factor for this kind of run, if the rest is built right.

Simplicity also favors a single 2bbl or 4bbl setup. Straying from simplicity in this kind of event will waste you a lot of time and $$, IMHO.

Lou

_________________
Home of Slant6-powered fun machines since 1988

My road race car, like Lou's, would have done this. I had an old Clifford and wouldn't hesitate to use one again. In fact it would be my first choice unless I could get the car on a dyno and show that the Fat Pack out performed the Clifford.

I'm more curious to know what you plan on using for a transmission. Having the top 2 gears close together will be of great benefit.

Of more benefit still would be to start with an early Barracuda. Wilford Day regretted selling his.

_________________
Joshua

Hey Rob No it's not going to be the 69 Valiant I had a Woodburn. It's going to be a 69 Dart I picked up 3 years ago.
Engine:
80 over block with steel billet main caps with some hard block in it
Wiseco pistons about 11-1 with K-1 rods
Ported cylinder head I really worked over Manley valves 1.78 & 1.50
T & D 1.6 rocker arms
OCG 1072 intake 240* .539 lift 977 exhaust 250* .547 lift 108*
340 steel flywheel and big clutch
Quick Time scatter shield
Tremec 5 speed with OD of .82
8 3/4 with 3.55 gears
Might be done by next season.

This is a picture Dave asked me to post for him. he doesn't know how to post pictures yet.



This is his new car he is talking about.


Richard

_________________
Part of Tyrde-Browne Racing

I think we should run all out down the course. I suppose they want a rollbar/cage for this thing? Hopefully I can leave the 64 Dart out west another year.

Looking forward to it,

Lou

_________________
Home of Slant6-powered fun machines since 1988

Looks like it's going to shape up to be a good runner. Looking at the build, I think going with a Clifford Shorty is going to be the better choice at this point, I wouldn't use the Fat Pak.

Cool!

....spent some time thinking about your original question.

I have romped this highway a couple of times.

The biggest obstacle in the perfect fuel delivery choice will be altitude changes in concert with Grades.

I would make my intake choice influenced by drivability ....

You want a car that will idle its way through the parking areas in LV and make max torque going up the 6000 ft pass.

Any manifold setup for port fuel injection.

I have been a carb guy for many years and I just might think about some kind on injection (other then Hilborn ) for this project.
also
What's your take on front crankshaft dampers ? I have used thick 440 dampers, Fluidampr, something I got from Clifford (many years ago) and the one from Australia ?