Everything you ever wanted to know about z6 y8 oil pumps - D-series.org

Go Back   D-series.org Motor Mayhem & Suspension Satisfaction Engine Building

D-Series.org is the premier Honda All Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 05-12-2019, 02:41 PM   #1 (permalink)
D-series lover
 
rabid's Avatar
 
iTrader: (1)
Join Date: Jun 2005
Location: Twin Falls, ID
Posts: 284
Rep Power: 16 rabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eagle
iTrader Score: 1 reviews
Default Everything you ever wanted to know about z6 y8 oil pumps

This has been posted before but here it is again. The z6 y7 y8 pumps are the SAME! The only difference is in the outside and how they mount up.

20190512_145755 by rabidflickr, on Flickr
20190512_145827 by rabidflickr, on Flickr

The z6 is the dirty one. Notice the area that meets the oil pan. This means they oil pans are not the same. There is a crank sensor mount on the y8 pump, and the oil dipstick hole, and a different size stud for the oil pickup tube. The y8 pump will mount to a z6 block just fine.

20190512_145859 by rabidflickr, on Flickr

The y8 end plug must be installed with red loctite. The z6 uses a crush washer.

20190512_150607 by rabidflickr, on Flickr

Same pump cover.

20190512_150732 by rabidflickr, on Flickr
20190512_150735 by rabidflickr, on Flickr
20190512_150921 by rabidflickr, on Flickr

The rotor is interchangeable.
rabid is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 05-12-2019, 02:41 PM   #2 (permalink)
D-series lover
 
rabid's Avatar
 
iTrader: (1)
Join Date: Jun 2005
Location: Twin Falls, ID
Posts: 284
Rep Power: 16 rabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eaglerabid is fly like an eagle
iTrader Score: 1 reviews
Default

20190512_151113 by rabidflickr, on Flickr
20190512_152357 by rabidflickr, on Flickr
20190512_152408 by rabidflickr, on Flickr
20190512_152535 by rabidflickr, on Flickr
20190512_152541 by rabidflickr, on Flickr

The internal passages are identical. The cross drilled pressure outlet has the same diameter as well.

20190512_153410 by rabidflickr, on Flickr

Same over pressure bypass parts.

20190512_152229 by rabidflickr, on Flickr

Same rotors. They both measure within 0.0001" of each other. Outside diameter 2.8686" Inside rotor tip to tip is 2.3222" 0.3113" thick.

This is a positive displacement pump. There is a certain volume of oil moved per rotation. It doesn't matter if it is 20 psi or 60 psi. (unless there are bad leaks) Because everything involved in the movement of oil is the same on both pumps, they have the same oil flow (regardless of what the Honda service manual says).

You can port these all day long and it won't make a difference for oil flow. If the bypass doesn't open, you have a set amount of flow. It can make a difference for how hard the pump is working though.
rabid is offline   Reply With Quote Quick reply to this message
Old 05-13-2019, 08:16 AM   #3 (permalink)
D-series soldier
 
92CXyD's Avatar
 
iTrader: (3)
Join Date: Apr 2009
Location: Casper Wyoming
Posts: 748
Rep Power: 15 92CXyD is hot as a volcano92CXyD is hot as a volcano
92CXyD is hot as a volcano92CXyD is hot as a volcano
iTrader Score: 3 reviews
Default

Are these OEM pumps?

You may want to see this then https://honda-tech.com/forums/forced...rison-3237036/

This should clarify the main differences between D-series oil pumps. Here is the measured numeric data. All measures in millimeters.

Rotor tooth count, inner/outer
PM3 9/10
P7A 10/11
PLC 10/11

Rotor outer dia.
PM3 77.9mm
P7A 72.9mm
PLC 76.9mm

Rotor thickness
PM3 6.5mm
P7A 7.9mm
PLC 7.5mm

Inlet port diameter
PM3 oval shape, around 14mm
P7A 14.3mm
PLC 14.3mm

Outer port diameter
PM3 ~12mm
P7A 12.2mm
PLC 12.2mm

Pocket depth, from oil pocket between inner/outer rotors
PM3 12.6mm
P7A 10.8mm
PLC 10.5mm

Pressure relief valve setup was identical in all pumps. Also spring tension feels same. Here is a small summary and notes/comments about those pumps;

PM3: Supposed to be highest flow rate. Abrupt inner shapes, smallest inner volume but smoothest outlet.

P7A: Supposed to be around 25% down in flow rate compared to PM3, no clear reason found for this. Most significant difference is outlet curve shape. Higher tooth count (=higher pumping frequency). Rotors are smaller in dia and pocket depth, but also thicker compared to PM3 so pocket volume should be quite close. Has clearly largest internal volume of all these pumps.

PLC: Very much the same as P7A, but has way smoother internal shapes. I mean here the transitions to pump part where it moves the oil from inlet to outlet side. In/out passage transitions to pump/rotor chamber are equally poor in all pumps. Minor differences in rotor dimensions, but rotor ID and oil seal are a lot bigger because of 4mm bigger crank snout in '01-> engines.

I don't know almost anything about different pumps, so I can't tell what makes the supposedly big flow difference between these pumps. Like I've said one possible culprit is the poor outlet design and implementation in newer pumps, but there might also be difference in rotor pocket volume too.

So, I chose the Y8 P7A oil pump for my D15 build. I'll continue soon with the information about what I actually did for the pump to perform strong in performance application.


I checked some Service Manuals too,

D16Y8 pump displacements is 33.4 liters/min @ 6800rpm
PM3(D15) 45 liters/min @ 6300rpm
D16A8/9 DOHC oil pump is 63 liters/min, something over 6000rpm too.
__________________
If you want to know about my avatar

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Quote:
ENMO.

An Emo car would cut its own tires and never get out of the garage.
92CXyD is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the D-series.org forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Security Question
*Required, this field is not shown to others: While balancing on a piece of wood, two inches by four inches known as a 2x4, john and his friend sally both spotted a dalmatian inside a truck with sirens, headed to put out a fire. State what kind of animal is mentioned in the sentence above.
Insurance
Please select your insurance company (Optional)

Log-in



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
D16Y8 Oil Consumption 1qt-300 smallz New Member Introductions 5 08-16-2018 03:15 PM
D16y3 turbo oil pump upgrade tm90sad Forced Induction 0 06-07-2015 03:40 PM
y8 intake manifold on z6 head/block - what I learned curlybandit Engine Building 0 05-19-2015 07:20 PM

iconAll times are GMT -8. The time now is 07:18 PM. | Welcome to Forum, please register to access all of our features.