Melling M55 vs M55A oil pump
Melting Slicks
Joined: Apr 2000
Posts: 3,490
Likes: 2
From: Oviedo FL
You might want to consider the 10552 which has 10% more volume with adjustable pressure. It can be used with the Canton 3/4" pickup (20-079) which will require a little modifying to mate up.
Mike
Mike
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
I'm using an M55a with success right now. What is the price difference? Mine was only around $35 I want to say. So far this pump has been great in hard cornering autocross situations keeping constant pressure.
Thread Starter
Drifting
Joined: Nov 2001
Posts: 1,783
Likes: 2
From: Latham NY
Originally Posted by scorp508
I'm using an M55a with success right now. What is the price difference? Mine was only around $35 I want to say. So far this pump has been great in hard cornering autocross situations keeping constant pressure.
The M55 is $12-13 and I have a spring already. I have a M55HV now but want to go back to the standard volume when I rebuild the engine. I see more harm than good with a HV pump in a rebuilt engine with normal clearances.
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
Originally Posted by Bluevette85
Is the only difference between these two pumps, the spring?
Can I put a high pressure spring in a M55 and get the same pressure as a M55A?
Can I put a high pressure spring in a M55 and get the same pressure as a M55A?
The M55A is good for a max of 75 PSI and the stocker will hit @60+ PSI according to Melling tech.
Team Owner
Joined: Sep 2001
Posts: 62,170
Likes: 1,735
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
I've used the M55A for over a year and the pressure is perfect. It stays above 60psi easily when the engine is cold and warm idle pressure stays in the mid 40s. High rpm pressure will stay in the high 60s to mid 70s depending on temperature. I believe it cost me less than $20 from Summit at the time.
To answer your question, yes, you can put the spring in, just be sure to weld on the pickup for the new motor.
To answer your question, yes, you can put the spring in, just be sure to weld on the pickup for the new motor.
