vac can VC1765

[jim cear]

I was trying to order a B20 which everywhere I checked correllated to a VC1765. I ordered it from NAPA and recieved VC1765SB which is stamped a B1!There was no mention in the online catalog of the "B" numbers. Does anyone know specs on this can?

[John H.]

Re: vac can VC1765

Jim -

Normally, the unit stamped "B1" is the VC-680, which starts at 8" and provides 16* @ 16". The VC-1765 is normally stamped "B20" - starts at 6" and provides 16* @ 12".

[Duke W.]

Re: vac can VC1765

I discussed this vacuum can last week.

B1 (VC680) may take as much as 18" to pull to the limit, and I do not recommend it for any Corvette engine. For base engine cams or any engine that pulls at least 17" of idle vacuum, the VC1802 (B22) 16 @ 14-16" is a proper choice.

The box is mismarked! Take it back and explain the problem to them.

B20 is the correct marking for the VC1765, 16 @ 11-13".

In Lars' vacuum can listing the VC1808(B26) had identical specs to the VC1765.

I think the "SB" suffix denotes a cheaper parts line than "Echlin".

Duke

[Dale S.]

Re: vac can VC1765

Oh no, Napa is pulling a Carquest.

[John D.]

Re: vac can VC1765

Echlin was bought out by Standard some time ago. Several ignition parts that I have bought are "reboxed". Sorta like the new Delco shocks made in Mexico with a AC Delco decal on a generic shock.

[J M.]

Re: vac can VC1765

When I ordered a VC1765 from NAPA last year, I received a box marked VC1765 with a B26 can. Since the specs were the same, I used it and it has worked fine with no problems.

[Richard S.]

Re: vac can VC1765

To save some grief you should test the unit for correct specs. Last year we tested 6 Napa vacuum cans right out of the box and 4 were not even close.

[jim cear]

Re: vac can VC1765

All of you are correct. First I tested the can today and it is at B1 specs as listed by Lars, not VC1765/B20 and sold to me "on line" and boxed as a VC1756SB. Second, out of curiosity, I tried NAPA's on line site with a couple of other "B series" and this unit was substituted as well! Buyer beware. Finally , I found a NAPA store and they confirmed there are two "lines" sold by NAPA. After searching through a good old fashion hard copy parts book we found the correct VC1765/B20 unit, with the correct specs listed, and it's on the way, I hope....we'll see.

[Duke W.]

Re: vac can VC1765

Yes, given the consolidation that is likely going on following Standard Motor Product's acquistion of Dana Controls, it's a good idea to test the can to verify that it pulls the link to the limit of travel at the specified vacuum +/- one inch Hg.

Then check it on the car again to be sure both start and end point degrees@vacuum are in spec keeping in mind that "specs" (like in Lars paper) are DISTRIBUTOR degees, which will double at the crankshaft, so a can speced at a maximum advance of 8 degrees is 16 at the crank.

Given the possible problems with wrong parts, it's probably best to order from a local store, and bring your Mighty Vac to check maximum vacuum to pull the link to the limit and verify that the stamped ID number is correct before you accept the part.

Duke