Search found 93 matches

by ice-n-tropics
Wed Aug 17, 2016 2:35 pm
Forum: Automotive Air Conditioning Forum
Topic: Liquid line inside suction line?
Replies: 1
Views: 1829

Re: Liquid line inside suction line?

The suction line heat exchange increases the overall icentropic system efficiency which results in slightly less horsepower per ton of cooling and can reduce liquid refrigerant below ambient for colder louvers Worked on a Rolls Royce with a larger SLHX made by ARA. Rolls was a salesman and Royce a e...
by ice-n-tropics
Wed Aug 17, 2016 12:16 pm
Forum: Automotive Air Conditioning Forum
Topic: System design with GMA6 Compressor
Replies: 11
Views: 7713

Re: System design with GMA6 Compressor

G'day Mate, FYI: OEM A/C engineers measure "engagement bump" on a dyno with a dial indicator touching the underside of the front bumper. The scroll and external control compressors are first prize for this fully objective evaluation. Vintage Air book "How to Air condition your Hot Rod...
by ice-n-tropics
Tue Aug 16, 2016 8:15 am
Forum: Automotive Air Conditioning Forum
Topic: System design with GMA6 Compressor
Replies: 11
Views: 7713

Re: System design with GMA6 Compressor

G'day mate, Now i get it! You'r trying to avoid a sunburn right arm wilst remaining a purist. Engagement torque = 50% pumping torque + 50% (or more for iron components) torque to over come rotary moment of inertia. Engagement torque shock causes deceleration which is barely noticable or measurable w...
by ice-n-tropics
Mon Aug 15, 2016 2:02 pm
Forum: Automotive Air Conditioning Forum
Topic: System design with GMA6 Compressor
Replies: 11
Views: 7713

Re: System design with GMA6 Compressor

3X Problems with A6 are weight of monster iron & steel 12.6 in3, high parasitic torque draw, heavy mounts causing undesirable coil spring height reduction on mounting side, borderline shaft seal with some refrigerant /lube combos, excessive pressure due to limited condenser real estate, front bu...
by ice-n-tropics
Sat Jun 25, 2016 11:57 am
Forum: Automotive Air Conditioning Forum
Topic: Need AC advice for 2000 Silverado
Replies: 11
Views: 6420

Re: Need AC advice for 2000 Silverado

By 1990 most compressors except 2 cylinder York recip and A6 had dual lip seals (one for vacuum and one for positive pressure) lip seals should not seep oil because oil causes clutch slip modern lip seals have a spiral groove to return tiney amount of seeped oil back into compressor electronic leak ...
by ice-n-tropics
Sat Jun 25, 2016 11:34 am
Forum: Automotive Air Conditioning Forum
Topic: 2004 Stratus
Replies: 5
Views: 3325

Re: 2004 Stratus

My memory is Stratus has a txv with scroll compressor which has a temperature protection switch (TPS) less than 1 pound refrigerant charge is dubious txv systems are typically slow to equalize 1)TPS will cycle compressor clutch with low charge and high side will be abnormally low while low side will...
by ice-n-tropics
Fri Jun 24, 2016 3:11 pm
Forum: Automotive Air Conditioning Forum
Topic: Odd restriction problem...need another perspective
Replies: 2
Views: 2255

Re: Odd restriction problem...need another perspective

HI GM Tech Yours is nominated for post of the month! Pretty good advice to look through the resistor mounting opening. Reminds me of the air flow problem in a pick up I fixed. Turns out the dove hunter/owner threw his doves on the passenger floorboard and the dove feathers were sucked into the evapo...
by ice-n-tropics
Mon Jun 13, 2016 10:05 am
Forum: Automotive Air Conditioning Forum
Topic: R134 service port leaks
Replies: 6
Views: 5029

Re: R134 service port leaks

1) New charging valves typically have a light oil film which aids in sealing. When servicing any elastomer in a A/C system, best practice is to apply lube 2) Refrigerant flow through the charging valve washes off all oil from the sealing surfaces 3) OEM charging is into the high side charging valve ...
by ice-n-tropics
Sat May 28, 2016 7:22 am
Forum: Automotive Air Conditioning Forum
Topic: Opinions: building a Mark IV(?) under dash system
Replies: 6
Views: 4617

Re: Opinions: building a Mark IV(?) under dash system

The OEM evaporator was a energy waster because it always draws in approx 30% outside hot humid air for cigar smokers pleasure, therefore a add on underdash evap should be matched with a smaller compressor displacement or lower drive ratio. OEMs never use variable compressors with a standard txv beca...
by ice-n-tropics
Fri May 27, 2016 4:28 pm
Forum: Automotive Air Conditioning Forum
Topic: Opinions: building a Mark IV(?) under dash system
Replies: 6
Views: 4617

Re: Opinions: building a Mark IV(?) under dash system

MARK IV had 3 basic hang on evaporators with metal diecast bezels chromed and all used TXV internally equalized: 1)Allegro with approx. 18,500 BTU per IMACA test 2) Monitor with 16000 BTU 3) Escort with 13500 BTU The Vintage Mark IV is a hybrid between the Monitor and the Escort but basically Escort...

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