For Sale 105 Oil Pump - Alfa Romeo Bulletin Board & Forums
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post #1 of 7 (permalink) Old 09-05-2018, 11:03 AM Thread Starter
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105 Oil Pump

Brand new, never installed, purchased from Classic Alfa. For 1600cc Alfa engines.

$200 + shipping from Northern California

IMG_9785 by gearheadexchange, on Flickr

IMG_9784 by gearheadexchange, on Flickr

-tj


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post #2 of 7 (permalink) Old 09-05-2018, 07:53 PM
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Does it have helical or straight cut gears?
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post #3 of 7 (permalink) Old 09-05-2018, 09:19 PM Thread Starter
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Quote:
Originally Posted by veloce430 View Post
Does it have helical or straight cut gears?
I have no idea. I didnít know there was a choice.
TJ


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post #4 of 7 (permalink) Old 09-06-2018, 09:24 AM
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It's not so much a choice. Most current aftermarket pumps have 9 tooth straight cut teeth. These are not ideal for engines that run faster than stock 2L FI engines, for a number of design / engineering reasons. They are FINE for their intended application. Most of the older higher speed engines and race engine builders prefer the 9 tooth helical pumps, which are no longer made as a quality, after-market product. Below are 2 photos. the first shows a straight cut 2L pump bottom. Note the LARGE live center lathe cut in the main shaft. This can be used to identify a straight cut gear pump without disassembly.
The second photo shows on the left, a main shaft without the LARGE live center cut and 9 tooth helical drive gear. The right in the second photo shows the 2L main shaft end with live center, and straight cut 9 tooth drive gear. These visual clues will give you an idea which pump you have.
Should you need more oil pump information, contact me by PM with your e-mail contact information.
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Last edited by Gordon Raymond; 09-06-2018 at 09:26 AM. Reason: No photos?
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post #5 of 7 (permalink) Old 09-06-2018, 09:30 PM Thread Starter
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Quote:
Originally Posted by Gordon Raymond View Post
It's not so much a choice. Most current aftermarket pumps have 9 tooth straight cut teeth. These are not ideal for engines that run faster than stock 2L FI engines, for a number of design / engineering reasons. They are FINE for their intended application. Most of the older higher speed engines and race engine builders prefer the 9 tooth helical pumps, which are no longer made as a quality, after-market product. Below are 2 photos. the first shows a straight cut 2L pump bottom. Note the LARGE live center lathe cut in the main shaft. This can be used to identify a straight cut gear pump without disassembly.
The second photo shows on the left, a main shaft without the LARGE live center cut and 9 tooth helical drive gear. The right in the second photo shows the 2L main shaft end with live center, and straight cut 9 tooth drive gear. These visual clues will give you an idea which pump you have.
Should you need more oil pump information, contact me by PM with your e-mail contact information.
Very interesting, thank you for the lesson!

I'm curious to know which one I have. I bought it about 10 years ago, from Classic Alfa I think. I'll take a peek and make a photo.

-tj


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post #6 of 7 (permalink) Old 09-07-2018, 08:52 AM
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You are better off not removing the bottoms on Alfa pumps for ID unless you plan on having them rebuilt. Once the running gear set has been set-up correctly, its best not to disturb that setting. Most pump identification can be made without disassembly. It become easier when you look at different variations every day for 50+ years!


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post #7 of 7 (permalink) Old 09-07-2018, 04:41 PM
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TJ, PM sent. Don't disturb it! I'll take it.
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