|07-10-2012 08:41 PM|
|Silver Surfer||Thanks for the info. Based on this thread and other misc research on the net, I have decided a standard pump is all I need. M-55 it is!|
|07-10-2012 08:39 AM|
Agreed, M-55. We use this pump in lower-level circle track engines without issues. The "Select" pump is fine. DO NOT use a "high volume" or "high pressure" pump for a 350 "mained" small block. The only application we use a HV pump in a small block is for 400s w/solids.
Also agree, "sleeved" pump drive shaft (Melling IS-55E).
Restrictors are used only with solid lifters (flat or roller).
The failures of pump bodies DOES occur on occasion, as previously stated. We've found the stock pump to be fine for tha vast majority of street applications.
|07-10-2012 02:16 AM|
HV pumps are for low idling motors. Such as 4 wheel drives. High Rpm motors have oil restrictors installed in the back of the block to keep the oil in the pan instead of the tops of the heads.
|07-09-2012 05:37 PM|
|07-09-2012 05:23 PM|
This thread was the first to come up on Google for me, but there are many, many more if you look-
• View topic - Before you buy your next oil pump *
|07-09-2012 05:19 PM|
|07-09-2012 05:01 PM|
|07-09-2012 05:00 PM|
Make sure you use a nice steel sleeved pinned pump shaft and toss the stock shaft and that plastic POS that comes in the stock gasket kit.
|07-09-2012 04:55 PM|
I will go with most here, however you want to make certain that whichever Melling Pump you decide to buy is from their "Select" Series-Melling has "cheapened" their low end offerings (the rumor is that the Big 3 wanted them to make them lighter in thier quest for fuel mileage, but I cannot confirm this)-
Anyway, there have been many reports of Pump failures due to high rpm and the resulting vibration breaking the casting at the "neck"-and you know what the end result is-
|07-09-2012 04:47 PM|
|07-09-2012 04:45 PM|
|07-09-2012 04:43 PM|
|Silver Surfer||In what situations do you need a high volume oil pump?|
|07-09-2012 04:42 PM|
|07-09-2012 04:40 PM|
|327NUT||A standard Melling M-55 is really all you need, if you want a little more use the 10% but it's not necessary.|
|07-09-2012 04:28 PM|
Do I need a high volume oil pump?
I am about to begin the build on this SBC 350 (+.060") shortblock and am trying to find a good oil pump. It has been suggested that I use a high volume, standard pressure pump by my uncle. I see Melling has a +10% and a +25% volume over OEM pump and these are the units I am considering.
I figure more is better, but if I am pumping more oil, I assume it is going to use horsepower to do it. So should I stick with the +10% unit? BTW this is a performance street motor (no track/strip time) and should be around the 375-400 HP mark with a hydraulic flat tappet cam.