BB - Replace high pressure oil pump?

[Joe R.]

Re: BB - Replace high pressure oil pump?

Duke recommended Sealed Power earlier in this thread. Is this a good pump?

https://www.napaonline.com/Catalog/C...219107021&An=0

I looked up this Sealed Power pump on Summit Racing's web site. In the picture, if you spin it around, it says M77HV! Mellings seems to be the only game in town.

I called Mellings technical support and talked to George. He recommends the 10775. It comes with the 75 # pink spring. He says to change it out for the 60 # blue spring. I may not have this quite right, but he said something like "the 10775 has a little better control of shaft wobble than the 10774." He did say for sure that the 10775 is better at high RPM than the 10774. He mentioned that the 10774 and 10775 both have the same steel gears. He said the pickup tube to try is P/N 77S1. There is some conflicting documentation as to whether or not it will fit. He thinks it will as long as I still have my original six quart pan. He did recommend taking measurements, possibly with clay, to make sure. He also said that he did not recommend using any of their high volume pumps on my car (M77HV, 10770, 10778). He also said that he thought the high volume pumps would cost me roughly five HP over the standard volume version.

Hopefully this clears up more confusion than it causes!

Joe

[Joe L.]

Re: BB - Replace high pressure oil pump?

I looked up this Sealed Power pump on Summit Racing's web site. In the picture, if you spin it around, it says M77HV! Mellings seems to be the only game in town.

I called Mellings technical support and talked to George. He recommends the 10775. It comes with the 75 # pink spring. He says to change it out for the 60 # blue spring. I may not have this quite right, but he said something like "the 10775 has a little better control of shaft wobble than the 10774." He did say for sure that the 10775 is better at high RPM than the 10774. He mentioned that the 10774 and 10775 both have the same steel gears. He said the pickup tube to try is P/N 77S1. There is some conflicting documentation as to whether or not it will fit. He thinks it will as long as I still have my original six quart pan. He did recommend taking measurements, possibly with clay, to make sure. He also said that he did not recommend using any of their high volume pumps on my car (M77HV, 10770, 10778). He also said that he thought the high volume pumps would cost me roughly five HP over the standard volume version.

Hopefully this clears up more confusion than it causes!

Joe

Joe-----


I think the only difference between the 10774 and 10775 is the supplied oil pump INTERMEDIATE drive shaft. The 10774 includes the stock-type shaft with nylon retainer and the 10775 includes the driveshaft with a steel retainer pinned to the shaft (like the GM #3865886). I think the pumps, themselves, are identical.

The 77S1 pick-up should work perfectly with your oil pan. The 77S1 is virtually identical the 1965-66 original pick-up.

I really doubt that the difference in power draw for the standard volume versus high volume pumps is 5 horsepower. More likely a 2 or 3 HP difference but it's not enough to be worth quibbling over. Even if it were a 5 HP difference, that would only be worth worrying about if one were involved in very competitive racing circles. For street use, you're never going to know the difference.

[Joe C.]

Re: BB - Replace high pressure oil pump?

I looked up this Sealed Power pump on Summit Racing's web site. In the picture, if you spin it around, it says M77HV! Mellings seems to be the only game in town.

I called Mellings technical support and talked to George. He recommends the 10775. It comes with the 75 # pink spring. He says to change it out for the 60 # blue spring. I may not have this quite right, but he said something like "the 10775 has a little better control of shaft wobble than the 10774." He did say for sure that the 10775 is better at high RPM than the 10774. He mentioned that the 10774 and 10775 both have the same steel gears. He said the pickup tube to try is P/N 77S1. There is some conflicting documentation as to whether or not it will fit. He thinks it will as long as I still have my original six quart pan. He did recommend taking measurements, possibly with clay, to make sure. He also said that he did not recommend using any of their high volume pumps on my car (M77HV, 10770, 10778). He also said that he thought the high volume pumps would cost me roughly five HP over the standard volume version.

Hopefully this clears up more confusion than it causes!

Joe

It seems like the Melling Tech Professional doesn't recommend a high pressure relief spring, nor does he advise installing a high volume pump. The exact diff in horsepower is moot..................2, 3, 5 HP. What's the difference. If you don't need a high volume or high pressure pump, then don't use one. I maintain that risking an increased tendency for spark scatter by driving larger gears should be avoided unless absolutely necessary. Take another look at posts #2 and #45.

Yes, you absolutely should use the steel bell ended shaft instead of the nylon sleeved one.

[Wayne M.]

Re: BB - Replace high pressure oil pump?

...I called Mellings technical support and talked to George. He recommends the 10775. It comes with the 75 # pink spring. He says to change it out for the 60 # blue spring. ....Joe

This BB oil pump discussion of colored springs prompted me to remove the unit (Melling ? with a "77-HV" tag) off a 65 BB that's on my engine stand. First time I've ever opened one up .

Couple of questions: Is this the "pink" spring ? Looks a like it's painted beige but a pink tint is also visible, IMO. There are 25_1/2 coils and overall relaxed length is 2.575". How the heck do you compress it to reinstall with the retainer disc and pin ? Does the valve in pic #3 look similar to the GM one ? Sounds like I should be looking for the "blue" spring.

Notice the pin -- GM says 3/32" dia x 3/4 length, which this one also is. But the scribed line effectively increases the taper by 2 thou, so I guess you drive it in from the non-scribed end first (it came out in the reverse order).

This pump has gear heights of 1.386".

[Joe L.]

Re: BB - Replace high pressure oil pump?

This BB oil pump discussion of colored springs prompted me to remove the unit (Melling ? with a "77-HV" tag) off a 65 BB that's on my engine stand. First time I've ever opened one up .

Couple of questions: Is this the "pink" spring ? Looks a like it's painted beige but a pink tint is also visible, IMO. There are 25_1/2 coils and overall relaxed length is 2.575". How the heck do you compress it to reinstall with the retainer disc and pin ? Does the valve in pic #3 look similar to the GM one ? Sounds like I should be looking for the "blue" spring.

Notice the pin -- GM says 3/32" dia x 3/4 length, which this one also is. But the scribed line effectively increases the taper by 2 thou, so I guess you drive it in from the non-scribed end first (it came out in the reverse order).

This pump has gear heights of 1.386".

Wayne------

The spring and valve appear to be configured about like the GM pieces. However, the spring might not have the exact same specs as the GM spring. In fact, I expect it does not.

Also, the Melling pump may vary in other ways from a GM-manufactured pump. They might produce the same end result, but accomplish that result in slightly different ways.

[Timothy B.]

Re: BB - Replace high pressure oil pump?

Wayne,

If you still have the original GM pump why not clean and blueprint the end clearance and put it back on the engine. Check that the rod/main clearances are .002 and you will not need to worry about low rpm pressure or to much high pressure.

[Joe R.]

Re: BB - Replace high pressure oil pump?

Joe, Tim & others, Any tips on installing the Fel-Pro one piece oil pan gasket? Is any form-a-gasket type material required at the front or back or elsewhere? Joe

[Joe C.]

Re: BB - Replace high pressure oil pump?

Joe, Tim & others, Any tips on installing the Fel-Pro one piece oil pan gasket? Is any form-a-gasket type material required at the front or back or elsewhere? Joe

Gasket should be installed dry. One dab of RTV silicone at each of the 4 corners where the flats meet the semicircular sections at front and rear. The gasket is supplied with plastic hangers which make installation easier if you've never installed one before. After you've installed it once, you shouldn't need them any more.

If you buy the gasket, it comes with full instructions.

Joe

[Joe R.]

Re: BB - Replace high pressure oil pump?

Joe,

Thank you, thank you very much!

Joe