LT1 engine - Team Camaro Tech
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post #1 of 7 (permalink) Old Feb 9th, 15, 09:38 PM Thread Starter
 
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LT1 engine

Hello All, First thread so here goes. What makes a Pre 1973 LT1 engine incompatible with air conditioning ? If a man wanted to build one similar to an LT1 & put in an '81 what should he NOT use to make it compatible with air ? Is it the cam, the heads, vacuum, or a combo of all ? If cam, what's the most lift & duration to use? Seeking knowledge.
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post #2 of 7 (permalink) Old Feb 10th, 15, 03:16 AM
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the BOSS&Ralph
 
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Re: LT1 engine

Welcome to the site.

IIRC the only issue was the rpm that the compressor could withstand. I think the only change when the '72 LT-1 Vettes could be ordered with A/C was to lower the redline from 6500 rpm to 5600 rpm.
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post #3 of 7 (permalink) Old Feb 10th, 15, 01:08 PM
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Re: LT1 engine

As stated, solid lifter engines, due to their high revving ability, were deemed not compatible with AC because the compressor couldn't take the higher RPM.

Only the 72 LT1 had a solid lifter cam with AC.

Today's cars (like my 02 Z28 and 05 Vette) turn the compressor off when you go WOT. The miracle of computer controlled cars...

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Last edited by PowerWindows; Feb 10th, 15 at 01:25 PM.
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post #4 of 7 (permalink) Old Feb 10th, 15, 02:02 PM
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Re: LT1 engine

One of these RPM switches properly wired in with a relay would do the trick.

http://www.summitracing.com/parts/su...49-1/overview/

Or just don't turn the A/C on when you nail it.

Robert

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post #5 of 7 (permalink) Old Feb 10th, 15, 02:30 PM
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Dave
 
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Re: LT1 engine

You can thank the 425 horse 409 for this GM policy that was implemented by a raft of warranty claims. It was GM policy from 1965 on that no vehicle equipped with a solid tappet could have A/C as an option. This is why you can not have A/C with a 375 horse 396 L-78 optioned Camaro. It had solid lifters. Same goes for a the Z/28 no A/C or automatic (it had a manual tranny because loose torque converters hadn't been invented yet.)

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post #6 of 7 (permalink) Old Feb 10th, 15, 04:06 PM
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the BOSS&Ralph
 
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Re: LT1 engine

Vacuum switches have also been use to cut power to the clutch at WOT.
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post #7 of 7 (permalink) Old Feb 10th, 15, 07:19 PM Thread Starter
 
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Re: LT1 engine

Thanks All !! Pretty Awesome to get great answers & knowledge ! Thanks again !
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