oil pump upgrade - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 07-17-2010, 07:27 PM
whojohnjones's Avatar
Registered User
 
Join Date: Jun 2010
Location: mississippi
Age: 26
Posts: 129
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
oil pump upgrade

Ok I'm installing new oil pump and its 25% more volume will anything else need upgrading?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-17-2010, 07:44 PM
bigdog7373's Avatar
Of course it's fast
 
Last photo:
Join Date: May 2010
Location: florida
Posts: 2,673
Wiki Edits: 0

Thanks: 13
Thanked 49 Times in 49 Posts
no, but unless you have a high perf motor, i don't see why you would need a higher flow oil pump.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-17-2010, 08:27 PM
327NUT's Avatar
Registered User
 
Last photo:
Join Date: Dec 2004
Location: So. Utah
Age: 68
Posts: 3,274
Wiki Edits: 0

Thanks: 0
Thanked 84 Times in 75 Posts
The stock Melling M-55 will be all you need oil pump wise. I have a pretty "warm" 331" sbc with the M-55 and it gives me plenty of oil press. High volume/high press pumps are for race cars....besides they eat hp to turn them.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-17-2010, 09:10 PM
bentwings's Avatar
bentwings
 
Last photo:
Join Date: May 2002
Location: St.Paul, Minn
Age: 72
Posts: 1,796
Wiki Edits: 0

Thanks: 0
Thanked 16 Times in 15 Posts
Personally I think running the stock oil pump on a hotrod motor is old school considering today's oil. We have marginal oil for flat tappet cams, we idle a lot in the rod shows and generally don't run very high rpm on the motors so not a great deal of oil is tossed around inside the motor.

I run a blown SBC. I lost a set of lifters due to my own mistake of not readjusting them soon enough. I installed a new set on the old cam along with a high volume oil pump. My thinking is that I would like higher oil pressure near idle speeds where I spend a lot of time. For example I made 14 laps of the fair grounds at Back to the 50's. 45 minutes a lap and I never touched the throttle except to park.

I can get nearly full 8 psi boost just off idle and I would like to have the OP up there when I start and not wait for the motor to get to 2000 rpm. So far I have well over 7000 miles this year on the new lifters and the cam seems very good yet. In fact I just changed the oil for the first time this year today and it was still transparent. I also cut the oil filter apart and it was in perfect condition.

To answer the question just make sure the oil pressure gage will read up to 100. On a good tight motor you should see 75+ on startup and 65 cruising. That's what I get with 10-30 oil. I also use the Lucas additive. I get 35 at 800 rpm idle hot as opposed to 20 with the stock pump
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-18-2010, 09:02 AM
whojohnjones's Avatar
Registered User
 
Join Date: Jun 2010
Location: mississippi
Age: 26
Posts: 129
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It's not a very high dollar oil pump jus 10 bucks over stock..its a melling m-55hv
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 07-18-2010, 09:20 AM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,658
Wiki Edits: 0

Thanks: 15
Thanked 59 Times in 56 Posts
The point is, a high volume oil pump is just a band aid for a engine that has excessive bearing clearances. HV oil pumps will take a considerable amount of power away from the engine to drive it. If the clearances are in spec you don`t need a HV oil pump. The stock replacement M55 works great and will give you great oil pressure as long as the clearances are good.
Sure there are other applications where one maybe needed such as heavy duty race or blown applications. But a stock or mildly hot rodded street engine and many race engines don`t require it.
My 4.3 V6 chevy that was rebuilt 2 years ago has the stock M55, it has 60 psi oil pressure cold start up, after the oil warms it never drops below 30 at idle speed of 600 RPM. At cruise speeds it`s around 40 to 45 PSI. Wide open throttle 60 psi.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 07-18-2010, 10:51 AM
Registered User
 
Last photo:
Join Date: Jan 2007
Location: canada
Posts: 564
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
i would think twice for running a m55hv on anything but a stock engine. Melling made the castings thinner few years back and even they say its only for stock engines. they make the old design under a new part #. not sure what it is but it sells for like $70
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 07-18-2010, 11:44 AM
Member
 
Join Date: Nov 2001
Posts: 447
Wiki Edits: 0

Thanks: 0
Thanked 11 Times in 10 Posts
Melling oil pump

Beware of new Melling oil pumps. If you order a melling pump buy the SELECT model m55HV. The stock pump m55 is a redesigned pump housing that is significantly weaker and in my opinion, prone to failure. I just ran into this a few weeks ago. I ordered a Milidon Pump which is heavy duty casting. It just slays me that a leading pump manufacture like Melling would cheapen the design that worked so well. I have numerous Melling products on my parts shelf, (Melling Cams, etc), I wonder if they are skimping on these too, I now wonder about using any of their products. Makes you wonder what company you can trust anymore!
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 07-18-2010, 12:07 PM
artsvettes's Avatar
Registered User
 
Last photo:
Join Date: Aug 2006
Location: New Jersey
Posts: 166
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Over on the speed talk forum they are saying the lighter weaker casting has gone away and the old casting is back in production.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 07-18-2010, 04:08 PM
ericnova72's Avatar
More for Less Racer
 
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 47
Posts: 9,394
Wiki Edits: 0

Thanks: 29
Thanked 469 Times in 426 Posts
Quote:
Originally Posted by artsvettes
Over on the speed talk forum they are saying the lighter weaker casting has gone away and the old casting is back in production.
I saw the same thing, the last weak pump was made in June 2009. Just pay attention so you don't get a remaining old stock thin neck pump.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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

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
Trouble with oil pump trblmker Engine 6 06-23-2009 04:04 PM
Which waterpump? Eagle1 Engine 5 08-06-2004 06:38 PM
distributor gear / oil pump wear ?? help bskaggs Engine 9 05-04-2004 09:55 AM
correct oil pump Blob Engine 1 12-18-2003 06:58 PM
Checking oil pressure after installing a new pump. WeberVette Engine 8 12-11-2003 09:34 AM


All times are GMT -6. The time now is 09:10 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.