 Which oil pump, 26 or 30 Schadex |
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| Chad911sc |
 Jun 23 2025, 05:54 PM
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Member  Group: Members Posts: 155 Joined: 24-September 24 From: Florida Member No.: 28,374 Region Association: South East States  |
I just built a 2056 with external oil filter/cooler/fan combo. I broke the engine in for 22 mins at 2200 rpm’s and everything sounded great and stayed at 185-195 degrees. After turning it off and looking underneath the car it had a small leak coming from the oil pump. I took it apart today and found the problem which is a small deflection in the metal on the case where someone previously used a screwdriver to pry it out. Will fix that tomorrow. My question is, while I have it out, should I put in a 30 Schadex that I have in hand, or put the 26 back in that I used during the build?
The 26 was giving me about 10psi at idle hot, and 60psi during throttle. At 2200rpms during the break in, it was staying about 40lbs when hot. I think that is acceptable, but if there is a good consensus that I should pop in the 30 High volume pump while I have it all apart, I will do that. Also I used the steel cover plate when I built the engine, because I thought it would be more durable with the steel gears riding against it. But, I was reading a few posts saying the cover plate with the ribs is more rigid and would seal the pump better. I have both, which one is better?? Attached thumbnail(s)  
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| Montreal914 |
Jun 23 2025, 06:34 PM
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Senior Member Group: Members Posts: 1,854 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California 
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From what I have read, you want to use the steel cover exactly for the concern you brought up.
I believe 10psi per 1000rpm has been the general rule. 30mm might give you too much pressure which may keep your oil bypass open preventing the oil to flow through the stock oil cooler. The pros will chime in… (IMG:style_emoticons/default/smash.gif) |
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| Superhawk996 |
Jun 23 2025, 07:13 PM
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914 Guru Group: Members Posts: 7,212 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(Montreal914 @ Jun 23 2025, 08:34 PM)  From what I have read, you want to use the steel cover exactly for the concern you brought up. I believe 10psi per 1000rpm has been the general rule. 30mm might give you too much pressure which may keep your oil bypass open preventing the oil to flow through the stock oil cooler. The pros will chime in… (IMG:style_emoticons/default/smash.gif) (IMG:style_emoticons/default/agree.gif) Bigger isn’t better. Excess pressure causes the relief valve to open, oil the bypasses the oil cooler even when hot. All of your external cooler is in the rear so your not even fighting pressure drops across long tube runs. |
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Posts in this topic
Chad911sc Which oil pump Jun 23 2025, 05:54 PM
Geezer914 Duplucate post. Jun 23 2025, 06:55 PM Geezer914 I have a 26 mm CB performance pump with a steel co... Jun 23 2025, 06:56 PM
Chad911sc 10-4 guys….just wanted to make sure I was on the... Jun 23 2025, 07:33 PM |
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