496 bbc built for a supercharger
8.7:1 comp
brodix race rite oval ports
performer RPM ( for N/A)
800 holley DP
crane blower cam:
236 deg @.050 .553 lift (intake)
246 deg @.050 .571 lift (exhaust)
114 lsa
1 3/4 primary ceramic coated headers thru little dual exhaust, generic mufflers (2 inch) (I know, I know)
ST-10 4sp
2.73 open (I know, I know)
215/70/14 pizza cutters
3800 lbs w/o me (add 230)

First night out netted

2.43 60 foot
9.15 @84.8 1/8th
13.83@ 105.98

that was a couple weeks ago.
I ditched the exhaust and drove to the track open headered.
my best time was 13.15 @ 111.2 but I lost the slip.

my first run of the night was 13.58 @ 104.5
butt after some jetting changes
2.22 2.50
8.7 @88.33 8.839 @89.6
13.21 @110.99 13.273 @110.95

I am looking to max my mph naturally aspirated then throw on the blower, and explore the outer limits of 2.73 gears

I seemed the more jet I threw at it the faster it went, I just ran out of time at the track to test again with more jet. The two above slips are same jetting and tune and shift points (5200). I just total blew it of the line on one.

My questions are: How much is left in it just tuning the motor? I have the timing at 36 total by 4000 rpm but no matter what I did I couldnt get the advance to come in soon enough.
and how fast would I go if I geared it and got some tires? Thank You and dont hesitate to ask questions.

anyone have any estimates on how much is left?
I took the advice I recieved a few weeks ago so this is an update
anyone have any similar experiences?
thanks again.

111mph is good for a low 12 knocking on 11's with a decent 60 ft and some more gear.

You need the timing in by 3000 at minimum. 3.55 or 3.73 posi would be my choice of gear for your motor. With the 2.73 you have now,once it starts spinning its over,no chance at all to gain traction. Hard to say what it will run but high 11's low 12's shouldnt be outta the question,then who knows when you get the supercharger on it.

thanks input guys. graemlins/beers.gif

I'd also figure that you should get some bigger headers. Those 1 3/4" are usually for small blocks. I have no idea what the primary sizes for BBs are, but I know their in the 2.xxx" area. You're gonna need those bigger headers to help your motor breath...ESPECIALLY once you throw that supercharger on it!!! Which brand supercharger is it? Roots or centrifugal? Good luck and have a blast!!! :D graemlins/thumbsup.gif

Originally posted by greasefire:
I ditched the exhaust and drove to the track open headered.
http://smileys.smileycentral.com/cat/4/4_6_100.gif
Man that had to be loud! How far of a drive is that?
Anyway,...like the others said, your MPH puts you in the low 12's. I wouldn't say 11's because this is a stick car and they typically MPH higher than an auto. You aren't helping your 60's much with a stick and a 2.73 rear either. I think that cam may be a bit small for 496 cubes also.
Get your timing in earlier than 4000 also.

Im fortunate that the local track (WIR) is about 3 miles from my house. I was extremly loud but I loved it and was on the look out for cops.

The headers Im using are the same as Car Craft used on their first 454 vortech supercharged motor (780 hp) and later made 926 hp with AFR heads. this is by coincedence I take magazine articles with a grain of salt.

I have a jet technologies centrifucal that I plan to use in a blow through set up. It is rought equivilant to a YS trim vortech.

Any one have any guesses as to how much my MPH picks up by getting more jet at it and getting the timing right?
It is at least in the ballpark jet wise because Im running 13.3:1 at the top end and started on my first pass with 15.2:1 at the top end
once again thanks for the input

Wow - Don Quixote lives!...and this is the hot rod he has created. Nothing like tilting at windmills (defying the normal path, trying to see something that fails others). You seem fully aware of the incongruity of the mix, so we'll all find out the "outer limits" as you venture forth.

With 8.7:1 static compression you should be able to do the following cheap "workaround" to your slow advance curve - just run ~ 6 degrees more initial advance. Run it on premium and there should be no problem with 42 degrees total advance. Just beware that the extra initial advance will make the bottom rpms pull even stronger.

You really need to get a posi, a peg legger with any power will always be hard to walk off the line.

Good tires, gears, and a posi will lop an easy 1/2 second off your 60' time - solid low 12's.

I've never heard of a Jet Centrifugal - is it a newer company or an older product?

I built a 468 centrifugal motor that other than rectangular port heads was similar enough to your engine. With no blower in place it made ~ 480 hp on motor alone. At 10.5 psi on pump gas it was up to 753 hp. Then at 17.1 psi on C16 it made 951 hp and 863 tq.

With the "Jet" centrifugal hooked up you will find clutches to be an issue. Get a good rev-limiter, the last thing you want is a ventilated engine from a missed shift.

Other than that, I say that the 2.73 gears will work better than you think with a supercharged engine - once you get a posi and sticky tires. Supercharged engines like to have load placed against them, the 2.73 gears will load the engine harder.

Thomas

Thomas, where your hp fiquires rear wheel or flywheel?

jet technologies is a new company that I got in contact with while searching on ebay and asking questions about their product. The company started about 1.5 years ago. I am running one of their newest models and giving them feedback, though I probably wont have it on the car until spring.

I already have a rev limiter on the car and it has saved the engine many times.

thanks once again for the input

That was flywheel hp.

Does this Jet Centrifugal have a website?

When you start tuning the carb with the centrifugal you should shoot for a much fatter a/f ratio - avoid running anything lean or crisp. For centrifugal carb setup I am a fan of www.customcarbs.com (http://www.customcarbs.com)

Thomas

Hey greasefire, you live near WIR? A friend of mine just emailed me a video clip of a nasty primered Nova dragging it's back bumper for almost half track, he said it's from the Green Bay area. Very wicked car, have you seen it? A lot of racers from my area are at KK regularly. Bob

thomas, jet technologies doesnt have a website that I am aware of. Adam (company head) said it was in the works. and thanks for the link.

bob, I saw that nova at the track last friday night when I was their tuning. Do you know Roger (aka the michigan mad man)

greasefire, tell this Roger that the "Michigan Mad Man" name is already taken: E.J. Potter. The older guys here will pick up on the E.J. Potter name, amongst many other crazy pursuits, for many years E.J. was an exhibition rider with an injected small block chevy in a motorcycle in which the goal was always a 1/4 mile long burnout. I've got videotape and pictures.

Thomas