melling oil pump casting change

grumpyvette

grumpyvette

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as many of you gentlemen know MELLING CHANGED the casting on their standard M55 high volume oil pumps making them weaker and thinner
MELLINGCASTING.jpg
like the thin casting on the left
but I understand that it caused a good deal of bad press and they are currently changing back to the thicker castings, but theres still thousands of the thin casting pumps in inventory that should not be use in high performance applications
The melling oil pump 10552 is a 10% more volume not pressure
It comes with two springs
If you use it with the "plain" spring it will be about 60lbs & the pink one is about 70lbs
this pump is a good choice for the vast majority of SBC engines
18750%20Neck.GIF

http://www.milodon.com/oil-system/oil-pumps.asp

these are the correct pumps to use on a sbc high hp build in many cases, and related info you'll need

http://store.summitracing.com/partdetai ... toview=sku

http://store.summitracing.com/partdetai ... N=700+150+

http://www.streetperformance.com/m/cats ... ickup.html


viewtopic.php?f=54&t=2187
 
Trying to decide what oil pump to use and have noticed the casting problem from several years back with the Melling oil pump. Is this still a concern about Melling oil pumps today???

Dart recommends standard volume and pressure oil pumps for the SHP SBC block. I like that Melling has a pump that's rated at 10% over volume (10552), instead of the usual 25% over volume. Does this pump have the lighter casting???

Is there something wrong with using a high volume pump for the DART SHP block??? The only down sides I can see would be an extra $43, couple of HP extra to drive the pump and maybe more windage for the crank.

A few seconds without oil would far out weigh any negatives of the high volume pump......what's your take on this???

Looking at this test (Excel Download), there is at most 4.7 hp difference between the stock 18755 pump and the high volume 18750. At the most there was only 2 degrees F difference. I sure don't won't to come up short on lubrication, what do you think for the Dart SHP???
http://www.carcraft.com/techarticles/cc ... index.html


Rick
 
http://www.summitracing.com/parts/MIL-1 ... toview=sku

Ive used these pumps on dozens of builds with zero problems, but keep in mind you use a 7-8 quart baffled oil pan, windage screen,with a high volume oil pump.
keep in mind that use of a high volume oil pump requires the almost mandator use of a high capacity baffled oil pan and a windage screen, and its not usually needed unless your engines had modifications like extra grooves in the distributor shaft to add flow to the cam /distrib gear contact area, holes in the oil gallery plugs to spray oil on the timing set, and fast bleed lifters or grooved lifter bores that increase the oil flow rates to the cam lobes and a bit larger than minimal bearing clearances that reduce the resistance to oil flow rates to increase bearing cooling rates due to those minimally larger larger clearances

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grumpyvette said:
http://www.summitracing.com/parts/MIL-18770?autofilter=1&part=MIL-18770&N=700+115&autoview=sku

Ive used these pumps on dozens of builds with zero problems, but keep in mind you use a 7-8 quart baffled oil pan, windage screen,with a high volume oil pump.
keep in mind that use of a high volume oil pump requires the almost mandator use of a high capacity baffled oil pan and a windage screen, and its not usually needed unless your engines had modifications like extra grooves in the distributor shaft to add flow to the cam /distrib gear contact area, holes in the oil gallery plugs to spray oil on the timing set, and fast bleed lifters or grooved lifter bores that increase the oil flow rates to the cam lobes and a bit larger than minimal bearing clearances that reduce the resistance to oil flow rates to increase bearing cooling rates due to those minimally larger larger clearances
Click to expand...
I do plan on making modifications to the distributor to provide more lubrication to the dist/cam gear. Also drilling the 0.030" hole in the oil gallery plug to provide extra lube to the timing chain. These are things I can personally do, without much expense.

Grumpyvette said in viewtopic.php?f=54&t=2187
drill at least the left oil passage plug with a .030-.035 drill to supply the cam gears with extra oil flow, on a race engine with a high volume oil pump, and a 7-9 quart oil pan, its a good idea to drill both the center and left plugs as it speeds oil flow reaching the lifters and prevents air being compressed in the passages slowing oil reaching the lifter and cam lobes
Click to expand...
For a high performance street engine, drilling the left(Driver Side) oil plug would be all I need to do. In your statement above, you have suggested drilling the center oil plug on a RACE engine ONLY....correct??? All I will need is to drill one hole in the left oil plug.



Rick
 
drill only one oil gallery passage plug on a street engine,
a race applications different in that you seldom see the engine run at idle for long periods
 
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