Re: [DML] Re: AC clutch running continuously
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Re: [DML] Re: AC clutch running continuously

Hello John

I'm sorry, but your information is a bit off when it comes to the 
compressors. SD510 and 508 are both 5 piston units. According to Sanden this 
model numbering system was used for compressors made for R-12. The first 
digit represents the number of pistons and the two following numbers 
represent compressor displacement in cubic inches.
SD 510 - 5 pistons, 10 cubic inches of displacement
SD 508 - 5 pistons, 8 cubic inches of displacement
I would not recommend going with 508... The displacement is lower by 20% 
(NOT 2%) and that big of a difference will be noticeable.
Numbering system for R-134a is similar. Equivalent to SD508 would be: 
SD5H13* and for the 510 it would be SD5H16*. In this case the characters 
are: first digit is a number of pistons, a letter that indicates port 
location (H-head, B-body), and remaining numbers represent compressor 
displacement in cubic centimeters divided by 10.
* - Sanden does not make 13 or 16 compressors and as a replacement they 
recommend using 14. SD5H14HD

If you do not want to use the SD510, or you would like to switch to R134a 
and are getting a new compressor I would recommend getting a SD7H15HD. This 
is a 7 piston unit with slightly smaller displacement. Those seven pistons 
would work better even with the loss of 10ccm of displacement.  It would be 
perfect for the DeLorean.

Hope this clears things up a bit....

Tom Niemczewski
vin 6149 (in Poland!)
Google earth: 52°25'17.30"N 21° 1'58.00"E

----- Original Message ----- 
From: "John Hervey" <john@xxxxxxxxxxxxxxxx>
To: <dmcnews@xxxxxxxxxxxxxxx>
Sent: Thursday, October 11, 2007 2:08 AM
Subject: RE: [DML] Re: AC clutch running continuously

> As far as working with R134, the original condenser for the DeLorean is
> perfect as so is the evaporator. The old compressor and the new compressor
> are the same. The SD 508 is an 8 piston unit and the SD 510 is a 10 piston
> unit. Other than that there is about 2% of the BTU output at 2000RPM's
> difference and they both do the job. I sell the SD510 in most cases and
> that's what the car was supposed to have come with which is 38.400 BTU.
> As I said I have talked to Sanden about this more than once and.... 

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