0Doug@MorosoPerformance

We are aware of the design change of the standard Melling M55 pump and do not use it. Our pumps are a Melling select series which are a better casting and are all around of a higher quality. We do have several billet pumps for extreme needs. [url]www.moroso.com

The above statement is not entirely correct. We do use the new Melling m55 for some of our pumps. We have not had any of these pumps returned to us do to breakage.

conv90

You can chime in this:
http://forums.corvetteforum.com/show....php?t=1552633

Slalom4me

I've posted a link in the other thread.

Thanks to Doug for commenting

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85vet

Doug,
Is there a reason that your blueprinted SBC oil pump#22112 is hard to come by. Summit had not available & I ended up buying a Melling race series oil pump.

0Doug@MorosoPerformance

Sorry to hear that. I don't know what the problem is, but I will check into it.
Thanks for letting us know

Corvette Kid

This is good news. After reading the other thread, I was a bit concerned, as I'd installed one of your printed pumps over the summer while installing my new shortblock. But I also knew that this particular pump had had some 'shelf life' before I got it, so I hoped I was alright. It's great to hear that it's not an issue either way, no matter what.

Slalom4me

In another thread, I have posted pictures of the Moroso 22100
pump I purchased last spring.

My pump appears to be different than the one illustrated at
Moroso's site.

I realize that for convenience, sometimes generic photos are
used for website development. Is the pump illustrated at Moroso
actually a current issue #22100? Or is it another pump model?

.

Slalom4me

Is the Moroso 22100 supplied with machined steel
or powdered metal gears?

These ones appear to be powdered metal





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Slalom4me

Should there be a date stamped on the carton, or will
this be on the enclosed literature? My lit is off-site
but here is an image of the box my 22100 arrived in.
I am unable to see a date on the carton.



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crashgordon

You should also look to see if you have a Moroso 22135 pump.
I found a post where a guy orderd a Melling M55HV and he got the thin casting, then he orderd the Sealed Power 224-4143, and got another thin casting.
So he thought he would avoid the thin casting by ordering a Moroso 22135... he received the thin casting also.
Here is the link WITH PICTURES

http://www.jalopyjournal.com/forum/s...hlight=melling

0Rick@Moroso Performance

Ok, here is the deal on our pumps.

We have two cast pumps that use the M-Select heavy-duty castings. They are p/n 22138, and 22139. They are both meant for 8 1/4 inch deep pans. ALL our other cast pumps use Melling’s fairly new "lightened" casting.

We have been selling the "lightened" casting for approximately 8-9 months. We fortunately have not had any failures that we have been made aware of.

We are working now to come out with our own pump that will replace all our "lightened" housing Melling pumps with a better, stronger casting. That is in the works, but will not be done for a few months.

I am very sorry for the confusion. Doug got some bad info at first, and in the effort of trying to put everyone at ease, posted it before we caught the mistake. We are doing our best to get it all straightened out.

For street and MILD performance, I would have no worries running any of our pumps. For racing and hard-core apps, I would use our 22138 or 22139 pumps, or any of our billet pumps.

Thanks

Rick

0Rick@Moroso Performance

All Moroso pumps except the 22138 and 22139 have been and will be powdered metal. The 22138 and 22139 had billet gears in them, but Melling is going back to powdered metal for all their gears because of cost, and mainly because the billet gears are harder and tend to lock up on foreign material, where the powdered metal gears are soft enough to allow the foreign matter to pass or embed.

Rick

Slalom4me

Thank you for the reply. I believe Doug was acting in good faith.

What criteria should a person use to determine to decide whether
to stick with the light casting or conclude that he has crossed
the mild performance line and should switch to a pump utilizing
the original-style casting?

My street-licensed car with a L98/A4 combo is essentially
stock but I use it primarily for Solo I/II events.

RWHP is well below 300 and RPM is limited to 5,500ish.
For reasons unrelated to the pump, I have taken to
logging oil pressure. For most of a run's duration,
pressure is between 50-54 PSI with spikes to 59.
Launches are mild but cornering and braking is at
the limit - chassis loads are greater than typically
seen on the street. I expect to bump up performance
and run longer events - is my usage such that I
ought to change my pump? The radial cracks at
the mounting bolt of a Melling posted in another
thread occured on a pump in moderate drag racing
usage.

Regarding the program with Melling to come out with
heavier castings for all Moroso pumps. For '84-'96
Corvettes, I feel it is important to provide a heavy
casting for shallower pans as soon as reasonably possible.

In my opinion, the majority of C4's (84-96) with aftermarket
pans are using designs that are only 7-1/4" deep - such as
the Canton 15-240T Road Race pan. (I had a Canton but
later switched to a pan built by Armando's - it is also has
a 7-1/4" sump.)

Even if I wanted to switch, the Moroso p/n 22138 and 22139
8-1/4" M-Select heavy-duty castings won't work and it looks
as though there will not be a suitable Moroso for my pan for
some time to come. Is this situation because Melling does
not yet offer a suitable casting in the M-Select line? Or is
it a matter of Moroso's target market typically using deeper
pans and is there a possibility Melling has an existing 7-1/4"
casting that another vendor uses to offer a 7-1/4" M-Select today?

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Slalom4me

I asked out of curiosity and do not have anything against powdered metal.
I appreciate that the technique allows net and near-net-shape parts to
be made faster and with less scrap. The metalurgy is there to dial
up the properties desired.

.

0Rick@Moroso Performance

To be on the safeside, I would upgrade your pump if you are going to add more power. It can't hurt, and could save a lot of headache.

The pickup on p/ns 22138 and 22139 is the deciding factor on pan depth. Our new stuff will be offered without the pickup, like our other pumps, so the customer can choose the pickup he needs for his particular pan. As of this second, I have nothing to offer for a 7 1/4 deep pan in production, but we could make you a M-Select pump/pickup combo for your depth in our custom department no problem.

I hope this helps.

Rick

Slalom4me

The Melling pump I referred to appears below with a description

Slalom4me

After looking at 85vet's remark about seeing 70 psi,
I went back to look at my oil pressure traces.

Pressure is along the left, time in seconds along the
bottom.

I found that while most were in the range I reported,
on occasion, pressures were higher. In the trace
below, there is a spike of 66 psi at the start and
pressure breaks over 60 several times.



Based on this, I may be closer to 85vet's usage
pattern than I initially thought, perhaps with similar
consequences already?

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