First time at the track! - Impala Tech
Bench Racing Stories, cruising & general shop BS

 
LinkBack Thread Tools
post #1 of 12 (permalink) Old 09-26-2011, 09:11 AM Thread Starter
Senior Member
 
Join Date: Apr 2011
Location: Keswick, Ontario
Posts: 181
 
First time at the track!

Yesterday I brought the caprice to the track, just to see what kind of numbers I'd get with it. That 4000lb lead sled, with a bone stock rear end (7.5" gear, 26 spline, non-posi, but a fresh 355 sbc, 700r4 with a 3000 stall, and 255 70 15 Radial T/A street tires, my quickest time was 14.3 seconds! The first time was a funny situation.. I thought my car would hook up to the ground.. as soon as the light turned, wot and I pretty much did a burnout down the whole track.. haha. Next time I learned to go easy into it, then open it up. I also brought way too much fuel than I needed. I filled up the 25gallon tank, because of the distance from my house to the track was about 2.5 hours away. But it got really good mileage on the highway with those high gears in the diff. And on top of that I had a full 22 litres of 94 octane in a gas can in my trunk. So that probably weighed me down some too. It was a test and tune class I was in, so being an amateur at this, there weren't many tricks that I knew. But apparently losing some pressure out of the tires is good.. I had cutouts, but I've driven with them open and I didn't think it would the car go any quicker. I think that back-pressure in some cars is actually better. I think a rear end swap would help the car out a little better. It at least needs posi-traction. So I just decided I'd share the story!

Luke
Lukes86 is offline  
Sponsored Links
Advertisement
 
post #2 of 12 (permalink) Old 09-26-2011, 11:59 AM
Senior Member
 
Join Date: Oct 2009
Location: Orange, CA
Posts: 1,323
Blog Entries: 34
 
What kind of power/mods do you have on that engine? That sounds like a pretty good time.



100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

1964 Impala 4 door sedan

My Bloggy Thing: http://www.impalas.net/forums/blog.php?u=2285
dcairns is offline  
post #3 of 12 (permalink) Old 09-26-2011, 01:22 PM Thread Starter
Senior Member
 
Join Date: Apr 2011
Location: Keswick, Ontario
Posts: 181
 
I don't really know to be honest. I'm the guy that we had a huge discussion a while back in the Performance section, when I had bought a circle track engine and was gonna throw it in my heavy car. After much discussion, I eventually sold that engine, and bought another "crate engine" out of a 1968 camaro. Its a vortech engine, with vortech heads. It was a shot in the dark. At least I heard it run. And I looked at the valvetrain, just by looking at it, it has guide plates, double springs, 1.6 scorpion roller rockers. I'm too young to pay any kind of money to build my own engine. So I was lucky that the one I bought is pretty solid. The head codes are 10239906 and the block is 14016379, which I believe has 4 bolt mains.
Lukes86 is offline  
 
post #4 of 12 (permalink) Old 09-26-2011, 03:55 PM
Moderator
 
Join Date: Jan 2006
Posts: 12,263
 
Those Vortec heads have been fully machined for a 0.520" max lift cam (with 1.5:1 rockers). The reason I know this is because they left the factory with a single wound bee-hive spring that went into coil bind at 0.480" inch valve lift before the machine work was done to that head. They will out flow most aftermarket heads (by most I mean there are less than five heads that have better flow numbers below 0.450 inch of valve lift) and are the best heads that Chevrolet has ever cast for the small block Chevy. So if you have any kind of aftermarket cam I suspect you are making 370 to 420 horse with a stock bottom end. Raise the compression and you will be looking at close to 500 horsepower. So that is why you can smoke a tire for a quarter mile.

Do it often enough and you will be looking for a new rear end as all of the axle lube burns off the cross shaft inside your open differential and welds the spider gear solid to the cross shaft. After that the desire to turn the axle is resisted by the weldment and eventually something breaks (usually the case).

Big Dave
Big Dave is online now  
post #5 of 12 (permalink) Old 09-26-2011, 04:18 PM Thread Starter
Senior Member
 
Join Date: Apr 2011
Location: Keswick, Ontario
Posts: 181
 
You really think it has that much horsepower Dave? I have no idea. The cam that's in there doesn't sound too lopey, or wild at all. Funny thing though, when it's cold for the first minute or two it does.
Lukes86 is offline  
post #6 of 12 (permalink) Old 09-26-2011, 05:16 PM
Moderator
 
Join Date: Jan 2006
Posts: 12,263
 
Those are free breathing heads with a great combustion chamber. The factory was designing a clean burning head for emission reasons, and it efficiently burns all of the gas that goes through the 170 cc intake ports. Because of this it is a free breathing head that makes more power than any other production head Chevrolet has cast to date (and since the SBC is now out of production it is now the best head ever).

Chevrolet also made the same designed head, only bigger, for racers sold as a service part. The Bow Tie Vortec head can out preform a lot of aftermarket heads that have larger ports (the Bow Tie head only has 190 cc intake ports and D shaped exhaust ports; though I have heard of a 230 cc version that is supposed to have been released in the last year or so but I haven't seen anything in print about it). Chevrolet has literally hundreds of well educated experienced engineers working in the power train division. You shouldn't be surprised that they can develop a good head considering their resource.

Big Dave
Big Dave is online now  
post #7 of 12 (permalink) Old 09-26-2011, 05:48 PM Thread Starter
Senior Member
 
Join Date: Apr 2011
Location: Keswick, Ontario
Posts: 181
 
It's not that I'm not surprised, this engine has definitely waken up the beast.. its just not all there yet. The rear end was left untouched. So all the power isn't really being used.
Lukes86 is offline  
post #8 of 12 (permalink) Old 09-26-2011, 05:48 PM
BA.
Moderator
 
Join Date: Aug 2008
Location: Miamisburg, Oh.
Posts: 3,106
Blog Entries: 15
 
Good story Luke, sounds like you had a good time! Sounds like a much better engine for you than that old one! Running a 14.3 in an Impala is not bad.

What was your MPH? Around 94-97?
(by the way, 100 pounds is equal to about 1 tenth in the quarter-mile, so that extra gas only hurt you to a small degree.)

HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432

Last edited by BA.; 09-26-2011 at 09:45 PM.
BA. is online now  
post #9 of 12 (permalink) Old 09-26-2011, 06:33 PM Thread Starter
Senior Member
 
Join Date: Apr 2011
Location: Keswick, Ontario
Posts: 181
 
You were pretty close Allan! Here is my time sheet: (I'm the right one)
Lukes86 is offline  
post #10 of 12 (permalink) Old 09-29-2011, 09:06 PM Thread Starter
Senior Member
 
Join Date: Apr 2011
Location: Keswick, Ontario
Posts: 181
 
Guys! I have some pictures that some friends took at the track, enjoy!


Lukes86 is offline  
post #11 of 12 (permalink) Old 09-30-2011, 09:21 AM
BA.
Moderator
 
Join Date: Aug 2008
Location: Miamisburg, Oh.
Posts: 3,106
Blog Entries: 15
 
sweet!

HOW A NOVICE REBUILDS A 66 IMPALA CONVERTIBLE:
http://www.impalas.net/forums/blog.php?u=1432
BA. is online now  
post #12 of 12 (permalink) Old 09-30-2011, 01:51 PM Thread Starter
Senior Member
 
Join Date: Apr 2011
Location: Keswick, Ontario
Posts: 181
 
I found a video a spectator made on youtube,, and I noticed that the car looks like its dumping black smoke out the exhaust right after it shifts gears.. look:

Lukes86 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Impala Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome