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Old 11-02-2017, 01:09 PM
MDB1056 MDB1056 is offline
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4160 Vacuum or Mechanical Secondaries?

EZ question. On the correct 4160 carb for the 83 S&S I just picked up are the secondaries vacuum or mechanical? I'm not a carb guy but thought they were mechanical as no vacuum lines on the boat I'm aware of, which is why the distributor is also mechanical advance.

Reason I'm asking is someone had placed a non marine carb on the engine and I'm looking to replace with correct, and most Holley 4160 marines I see all note vacuum secondaries, although I have seen some with the vacuum port simply capped.

Figured I'd ask the TT gurus. Also please confirm that the correct carb is 600 CFM

The Quadrajet on my 92 Hydrodyne I know well but this is my first marine holley

thanks!
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Old 11-02-2017, 03:56 PM
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vacuum secondary holley marine model 4160 600 cfm.
https://www.summitracing.com/parts/h...19-1/overview/
the vacuum secondary operates off internal carburetor vacuum not external nipples.
the arrow is showing the vacuum secondary
Name:  carb-sizing-17.jpg
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Size:  141.2 KB
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Old 11-02-2017, 04:01 PM
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Quote:
Originally Posted by MDB1056 View Post
EZ question. On the correct 4160 carb for the 83 S&S I just picked up are the secondaries vacuum or mechanical? I'm not a carb guy but thought they were mechanical as no vacuum lines on the boat I'm aware of, which is why the distributor is also mechanical advance.

Reason I'm asking is someone had placed a non marine carb on the engine and I'm looking to replace with correct, and most Holley 4160 marines I see all note vacuum secondaries, although I have seen some with the vacuum port simply capped.

Figured I'd ask the TT gurus. Also please confirm that the correct carb is 600 CFM

The Quadrajet on my 92 Hydrodyne I know well but this is my first marine holley

thanks!
Your core question is answered but the reason distributors use mechanical advance on a boat is because of the linear relationship between engine speed and load on a boat, which is different than a wheeled vehicle.
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Old 11-02-2017, 04:57 PM
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Quote:
Originally Posted by Spork View Post
vacuum secondary holley marine model 4160 600 cfm.
https://www.summitracing.com/parts/h...19-1/overview/
the vacuum secondary operates off internal carburetor vacuum not external nipples.
the arrow is showing the vacuum secondary
Attachment 169804
Is the carb shown in this picture a marine 4160? I thought marine carbs have J-tubes. Also the fuel inlet on the carb show is incorrect. Just wanted to point out to the OP in case there is confusion.

SKIDIM is a good source for a 4160, you can get 10% off by using one of the promo codes on their homepage.
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Old 11-02-2017, 06:09 PM
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All the info is correct except the picture is an automotive Holley 4150.
This is a picture of the correct marine Holley 4160. Name:  IMG_4644.jpg
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Size:  129.9 KB


Custom wheel and tire packages
Rebuilding Holley Carbs $289
Rebuilt complete Holley Carbs $425
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CUSTOM WHEEL & TIRE PACKAGES

$125 LED TRAILER LIGHT PACKAGE - FREE SHIPPING
REBUILDING HOLLEY MARINE CARBS - $325 DELIVERED
REBUILT COMPLETE MARINE HOLLEY 4160 CARBS $495 DELIVERED
Email - [email protected]
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Old 11-02-2017, 09:02 PM
MDB1056 MDB1056 is offline
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Many thanks

Knew the TT team could answer easily . Thank you all. Now know where the vacuum comes from too! Appreciate the comments. Will be getting a correct carb for this engine!
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Old 11-03-2017, 01:04 AM
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Quote:
Originally Posted by MDB1056 View Post
Knew the TT team could answer easily . Thank you all. Now know where the vacuum comes from too! Appreciate the comments. Will be getting a correct carb for this engine!
I rebuild Holley carbs and can supply a rebuilt 4160 if you are interested.
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CUSTOM WHEEL & TIRE PACKAGES

$125 LED TRAILER LIGHT PACKAGE - FREE SHIPPING
REBUILDING HOLLEY MARINE CARBS - $325 DELIVERED
REBUILT COMPLETE MARINE HOLLEY 4160 CARBS $495 DELIVERED
Email - [email protected]
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