69/70 L-46 questions.
Thread Starter
Pro
Joined: Feb 2008
Posts: 556
Likes: 13
From: C3 Forum, Colorado
69/70 L-46 questions.
Did all 69 L-46 cars come with air injection emission systems from the factory?
I don't believe the 49 state 70 L-46 cars did.
But yet all 70 the LT-1's got it.
Is this right? If so, does anyone know why that is?
I don't believe the 49 state 70 L-46 cars did.
But yet all 70 the LT-1's got it.
Is this right? If so, does anyone know why that is?
Safety Car
Joined: Dec 1999
Posts: 3,607
Likes: 839
From: PA
Easy one...
All 1969 L-46 Corvettes were equipped with A.I.R equipment. No 1970 L-46 Corvettes were equipped with A.I.R.
In 1969, all Corvettes were equipped with A.I.R. In 1970, the only Corvette to be equipped with A.I.R. equipment was the LT-1.
Thanks again for the wheel!
Regards,
Stan Falenski
All 1969 L-46 Corvettes were equipped with A.I.R equipment. No 1970 L-46 Corvettes were equipped with A.I.R.
In 1969, all Corvettes were equipped with A.I.R. In 1970, the only Corvette to be equipped with A.I.R. equipment was the LT-1.
Thanks again for the wheel!
Regards,
Stan Falenski
Thread Starter
Pro
Joined: Feb 2008
Posts: 556
Likes: 13
From: C3 Forum, Colorado
Thread Starter
Pro
Joined: Feb 2008
Posts: 556
Likes: 13
From: C3 Forum, Colorado
But if it was introduced and became a requirement in 1969 wouldn't the following years require it too?
They only kept it on the LT-1. Not even the 454 got it.
The very same system came back a couple of years later with even more intricate, expensive, well engineered pieces of crap.
And it came back on all cars.
Safety Car
Joined: Sep 2007
Posts: 4,458
Likes: 331
From: Indy Indiana
probably in 1970 there was a different set of emmission requirements, or GM found other ways to reduce emissions so the air pump was not needed..
i am sure there were teams and teams of people working 40 hour weeks trying to understand and comply with the government regulations. and they experimented with any number of potential solutions..
i am sure there were teams and teams of people working 40 hour weeks trying to understand and comply with the government regulations. and they experimented with any number of potential solutions..
Melting Slicks
Joined: Aug 2004
Posts: 2,220
Likes: 6
From: www.Z16.org North/West Pennsylvania
But if it was introduced and became a requirement in 1969 wouldn't the following years require it too?
They only kept it on the LT-1. Not even the 454 got it.
The very same system came back a couple of years later with even more intricate, expensive, well engineered pieces of crap.
And it came back on all cars.
Team Owner
Joined: Sep 2006
Posts: 31,301
Likes: 4,389
From: Westminster Maryland
Hi,
I don't mean to start a 'ruckus' here.
My understanding has been that the AIR system was first put on the high performance engines in order to maintain their performance. The AIR system allowed the high compression ratios, carb settings, and timing and advace, to be maintained while meeting the new EPA requirements.
The low performance engines didn't get the AIR system but had their compression ratios dropped as part of the 'fix'. (Cheaper and who cared?) Thus the 300 hp engine dropped to 270 hp.
The L-88, tri-power, LS-6, and LT-! engines all had AIR, AND high performance.
Regards,
Alan
I don't mean to start a 'ruckus' here.
My understanding has been that the AIR system was first put on the high performance engines in order to maintain their performance. The AIR system allowed the high compression ratios, carb settings, and timing and advace, to be maintained while meeting the new EPA requirements.
The low performance engines didn't get the AIR system but had their compression ratios dropped as part of the 'fix'. (Cheaper and who cared?) Thus the 300 hp engine dropped to 270 hp.
The L-88, tri-power, LS-6, and LT-! engines all had AIR, AND high performance.
Regards,
Alan
Last edited by Alan 71; Apr 2, 2011 at 06:24 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Thread Starter
Pro
Joined: Feb 2008
Posts: 556
Likes: 13
From: C3 Forum, Colorado
That makes sense.
I guess the reason all the 69's got it and the 70's didn't will still remain a mystery though.
Maybe it has something to do with the "Why 69's considered to be the best year of the C3" sort of thing.
Thanks for you help.
I guess the reason all the 69's got it and the 70's didn't will still remain a mystery though.
Maybe it has something to do with the "Why 69's considered to be the best year of the C3" sort of thing.
Thanks for you help.
