melling oil pump for type 4

[Fast Eddie]

i have just been looking at different oil pumps and read this about the pump that i run..


 MELLING 30mm Cast Iron Oil Pump, Type 4 Engines are made with 38% larger gears. Precision manufactured in the USA, they offer a great pump for a high performance engine. Because of the volume of these pumps, you do NOT want to use 20-50 oil with it, or you will overwhelm the bypass system in the engine block. Cruise oil pressures should be ~35-45psi HOT, if you have more than this go DOWN on oil viscosity.
With huge gears like this you can use a thin multi-grade oil for a lot of oil flow through the engine. This high flow through the bearings really removes the heat, and the engine runs cooler.


does this sound correct? i have been running 20/50 oil, but not checked the pressure..

 
 
 
   

 

[RMS Boxer Service]

Why change the oil pump?? A blueprinted stock type 4 pump is a very good pump !!! 
Much better than aftermaket pumps. You don't need a 30 mm pump unless it's a full
race engine or totally worn out,leaking and greasy engine.
Just my 2 cents.

/Rolf

[Garrick Clark]

As Callook67 says the stock type 4 pump is a good piece of kit al be using 1 on my 1911 build

[DKK Ted]

Very interesting!

Ted

[paul_f]

Go dry sump otherwise you will be building it again next year

[Fast Eddie]

late reply , sorry! 

so what is the problem with alot of oil pressure? surely itll just blow past the relief valve if its too much??

the only reason i have one is that it is what was sold by a type 4 performance company in the uk, and as they used them i thought that'd be the way to go..

anyways, what about this dry sump pump??

http://www.cbperformance.com/catalog.asp?ProductID=189

anyone used one? good or bad? apparently they are cross ported inside so there is no need for case modification..
i know these are for type 1, but i have seen a type4 one for sale...

[Torben Alstrup]

Excessive oil pressure wear the bearings out too fast. Creates a lot of drag in the engine, hence loss of power. And finally, if no external thermostatic controlled oil cooler is used, the oil does not get cooled correctly.
Eventhough it has been used widely by some builders, the Melling pump is not the answer for a type 4, nor a type 1 for that matter. (I thought we discussed that to death 10-15 years ago. But fair enough, some of you are a lot younger than I am  .) Oh well, cant change that can we 

As said, the stock oil pump (if in good condition) is more than enough for most engines. High power/turbo engines can benefit from a 30 mm pump if the housing is modified to handle the extra volume. If you just plug it in a non modified housing you will gain very little.

The CB/Shadek dry sump pump is OK. It needs a little attention in the galleys though before installation.
- While dry sump lubrication is very safe unless you blow a hose, it does create some other issues like contolling oil level etc. I am not 100% for it, unless we are talking race. Other people may think different. And I am open to suggestions to overcome the before menthioned issues...

T

[paul_f]

- While dry sump lubrication is very safe unless you blow a hose, it does create some other issues like contolling oil level etc. I am not 100% for it, unless we are talking race. Other people may think different.

I was talking about dry sump being good if you are doing this 

<a href="http://www.youtube.com/v/VlgIKc6PHtY" target="_blank">http://www.youtube.com/v/VlgIKc6PHtY</a>

[Torben Alstrup]

That must go into the category of "Other people may think different" 

Apart from that, yes there is good need for it there.

T

[Fast Eddie]

i may not  be doing do-nuts when its rebuilt... i'll keep it in a straight line for the time being.. 

thanks for the info Torben, about the melling pump.. as i said before, a UK based performance company sold me it, so i assumed it to be a good choice. 

would it make a difference that i run 2 oil coolers and alot of hose? would a standard pump still be good enough??

[Torben Alstrup]

It will make a difference. But only if you improove the oil galleys in the case. And I still would recommend against using a Cast iron pump in an aluminum case. No matter who sold it to you. The expansion rate is simply too different. And finally, those cast iron pumps wear out way too fast.
T