Go Back   Corvette Forum > C1 & C2 Corvettes, 1953 - 1967 > C1 & C2 Corvettes
Sign in using an external account
Register Forgot Password?
Register Search Today's Posts Mark Forums Read FAQ Vendor Directory
Search
C1 & C2 Corvettes
General C1 Corvette & C2 Corvette Discussion, Technical Info, Performance Upgrades, Project Builds, Restorations Sponsored by
Flaming River
Industries

Welcome to Corvetteforum.com!
Welcome to Corvetteforum.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join Corvetteforum.com today!


Corvette Store
 
 
C7 Parts & Accessories
C6 Parts & Accessories
C5 Parts & Accessories
C4 Parts & Accessories
C3 Parts & Accessories
C2 Parts & Accessories
C1 Parts & Accessories
Wheels & Tires
Sponsored Ads
 
 
Vendor Directory
  
Reply
 
 
 
 
Thread Tools Search this Thread
Old 03-06-2009, 07:59 AM   #1
wmf62
CF Senior Member
St. Jude Donor '07
Support Corvetteforum!
 
wmf62's Avatar
 
Member Since: Jun 2006
Location: Inverness FL
Default 1970 LT1 torque/horsepower curves

does anyone have, or know where i can find, dyno graphs of the torque/horsepower curves for a stock 1970 LT1?
Bill
wmf62 is offline   Reply With Quote
Old 03-06-2009, 08:20 AM   #2
Shurshot
CF Senior Member
 
Member Since: Jan 2005
Location: Lake Wylie SC
Default

Have you asked in the C3 section?

If that does not pan out or there are not any good replies here I would suggest going to http://www.speedtalk.com/forum/.

Doug
Shurshot is offline   Reply With Quote
Old 03-06-2009, 09:02 AM   #3
mashinter
CF Senior Member
 
mashinter's Avatar
 
Member Since: Oct 2008
Location: Troy Michigan
Default

Quote:
Originally Posted by wmf62 View Post
does anyone have, or know where i can find, dyno graphs of the torque/horsepower curves for a stock 1970 LT1?
Bill
Bill:

These are published in Best of Corvette News, p. 579

Bill
mashinter is offline   Reply With Quote
Old 03-06-2009, 09:11 AM   #4
wmf62
CF Senior Member
St. Jude Donor '07
Support Corvetteforum!
 
wmf62's Avatar
 
Member Since: Jun 2006
Location: Inverness FL
Default

Bill
thank you very much, i would have never thought to look in there (haven't looked at that book in years.... )

Click the image to open in full size.

Bill

Last edited by wmf62; 03-06-2009 at 09:19 AM.
wmf62 is offline   Reply With Quote
Old 03-06-2009, 05:17 PM   #5
vetrod62
CF Senior Member
 
vetrod62's Avatar
 
Member Since: Feb 2006
Location: Towaco NJ
Default

Quote:
Originally Posted by wmf62 View Post
Bill
thank you very much, i would have never thought to look in there (haven't looked at that book in years.... )

Click the image to open in full size.

Bill
Those graphs are bogus. HP and TQ have to cross at 5250 rpm.
vetrod62 is offline   Reply With Quote
Old 03-06-2009, 07:11 PM   #6
Shurshot
CF Senior Member
 
Member Since: Jan 2005
Location: Lake Wylie SC
Default

Quote:
Originally Posted by vetrod62 View Post
Those graphs are bogus. HP and TQ have to cross at 5250 rpm.



Good eye

As soon as I realized that I could not read the print without a magnifying glass I gave up....... but for sure if they do not cross at 5250 they do not reflect a real dyno run on a real motor....... more like a sales department clerk's handiwork

Doug
Shurshot is offline   Reply With Quote
Old 03-06-2009, 07:22 PM   #7
Zigler
Junior Member
 
Member Since: Oct 2006
Location: Golden CO
Default

Take a closer look at the scales. The torque (ft-lb) and power (hp) only cross when they are both plotted on the same scale. 5252 is only a conversion factor; 1 hp = 5252 ft-lb * 1 rpm = 1 ft-lb * 5252 rpm. There is nothing magic about crossing at that number and being a "real" plot. It only means power and torque are plotted using the same scales. They weren't for these plots.

Cheers,
- Brad
Zigler is offline   Reply With Quote
Old 03-06-2009, 08:06 PM   #8
jim lockwood
CF Senior Member
 
jim lockwood's Avatar
 
Member Since: Feb 2007
Default

Zigler is absolutely correct.

Look at the torque on the right hand scale at what you interpolate to be 5250..... it's something less than 360 ft-lbs.

Now look at horsepower on the left hand scale at the same interpolated 5250 RPM and you get something less than 360 HP.

There's your mandatory "crossover".

Jim
jim lockwood is online now   Reply With Quote
Old 03-06-2009, 08:32 PM   #9
wmf62
CF Senior Member
St. Jude Donor '07
Support Corvetteforum!
 
wmf62's Avatar
 
Member Since: Jun 2006
Location: Inverness FL
Default Biiger graph

i was trying to keep people from having to pan sideways.
yes, there are different scales on the right & left sides.

Click the image to open in full size.

the reason i asked was that with a 3.36 rearend and a .73 OD,
the normal rpm range that my LT1 operates in is 1500 to 2500
and i was trying to determine what the most efficient operating
'sweet spot' was for that engine

Bill

Last edited by wmf62; 03-06-2009 at 08:37 PM.
wmf62 is offline   Reply With Quote
Old 03-06-2009, 11:35 PM   #10
Shurshot
CF Senior Member
 
Member Since: Jan 2005
Location: Lake Wylie SC
Default

Quote:
Originally Posted by jim lockwood View Post
Zigler is absolutely correct.

Look at the torque on the right hand scale at what you interpolate to be 5250..... it's something less than 360 ft-lbs.

Now look at horsepower on the left hand scale at the same interpolated 5250 RPM and you get something less than 360 HP.

There's your mandatory "crossover".

Jim
With the larger print I can see what you and Zigler are saying

Ok...... my bad :o

Doug
Shurshot is offline   Reply With Quote
Old 03-07-2009, 01:49 AM   #11
Solid LT1
CF Senior Member
 
Solid LT1's Avatar
 
Member Since: Dec 2003
Location: Fremont CA
Default

I like the fact that the LT-1 HP is still climbing at 6000RPM where the LS-5 is laying down at 5100RPM. You should remeber the early SAE testing was done with a 30/30 cam and not the LT-1 solid cam, many think the LT-1 gives away 10-15HP from the SAE test. My 70 LT-1 needs to get to 2200-2400RPM before she is really happily running (possibly because of running pump gas+additive when running on 30% race gas/pump gas mix she is much happier.)
Solid LT1 is offline   Reply With Quote
Old 03-07-2009, 09:03 AM   #12
wmf62
CF Senior Member
St. Jude Donor '07
Support Corvetteforum!
 
wmf62's Avatar
 
Member Since: Jun 2006
Location: Inverness FL
Default

yep, that's about what i figure, i find myself trying to keep above 2000
by driving in 2nd or 3rd around town and not using OD until i get above
55 (which just almost gets to 2000. 75 is just about 2250). the Rochester
FI handled it well on leaded gas in the summer. but for as much as i drive it
would be too expensive to use racing fuel, even as a mixture (and i would
have to drive 20 miles just to get some...)...
Bill

Last edited by wmf62; 03-07-2009 at 09:06 AM.
wmf62 is offline   Reply With Quote
Old 03-07-2009, 09:03 AM
 
Go Back   Corvette Forum > C1 & C2 Corvettes, 1953 - 1967 > C1 & C2 Corvettes
Reload this Page 1970 LT1 torque/horsepower curves
 
 
 
Reply

Tags
1970, 1970lt1, 1996, 5250, cam, corvette, crossover, curve, dyno, horsepower, lt1, plot, rpm, torque, z06


Thread Tools Search this Thread
Search this Thread:

Click for Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Summit K1104 cam too much for 882 heads? waid1017 C3 Tech/Performance 98 05-19-2012 10:53 AM
4-hole carb. spacer on Quadrajet longbros C3 Tech/Performance 9 05-02-2008 10:20 AM
L79 Horsepower/Torque curve kyosho C1 & C2 Corvettes 14 05-15-2003 09:09 AM
More power/speed from my 1978 L48...or should I swap in a crate engine? TravMsns C3 Tech/Performance 12 10-14-2001 10:43 AM
How much horsepower and torque does a stock LT1 put out? Bradley33 C4 Tech/Performance 3 09-18-2001 08:46 AM


All times are GMT -4. The time now is 09:38 AM.


Emails & Password Backup