XXO/BVGC '38 Chevy Coupe Build

[Tman]

Buddy, are you going to the HAMB drags in August?

He mentioned on the HAMB that they are running the car there for fun. 

[38flattie]

Buddy, are you going to the HAMB drags in August?

Gary, yes we are!

If the engine survives the salt, we'll make a couple of passes for fun. The strip should not be as hard on the engine as the salt. If the car is not running, we'll take it and just watch the drags.

I've been trying to borrow a set of slicks, and haven't found any yet, but I still have time.

Hopefully, I'll see you there!

[38flattie]

Question here:



I'm figuring out some of the oil system plumbing. Do I need to run an oil filter system?

If so, should the filter be before the oil enters the pump, going to the engine, or after (this,I would think) the pump, on the return side?

Thanks in advance!

[RichFox]

Since it was easy to do I ran an oil filter on the pressure side of the pump. Really I don't expect to run the oil long enough to get it dirty, and the pickup screen will keep the big hunks out. But what's the harm?

[38flattie]

Thanks Rich!

I also have screens in the pan.

[Milwaukee Midget]

I can speak for the FE Ford and the A block BMC.  Sump, pump, filter, galleries.  I don't know if it's different with a dry sump.

A lot of salt in the air at Bonneville - gets everywhere.  Taste your oil after you've spent a couple of days on the salt.  It's not like popcorn, but some salt gets in there.  

I'm thinking I'd use a filter.  This one is to expensive and too exotic to risk it.

[38flattie]

Thanks Chris!

I'm going to use a filter- just seems like a good idea, especially since I don't have an air filter!

[manta22]

Question here:



I'm figuring out some of the oil system plumbing. Do I need to run an oil filter system?

If so, should the filter be before the oil enters the pump, going to the engine, or after (this,I would think) the pump, on the return side?

Thanks in advance!

NEVER put a filter ahead of an oil pump (or a fuel pump for that matter) -- a screen is OK to keep big pieces of debris out of the pump, but a filter has too much restriction.

A pump can generate lots of pressure on its outlet side but on the suction (inlet) side it can't pull more vacuum that the atmospheric pressure. Since a pump isn't 100% efficient, the vacuum won't be very high but it won't suck lots of oil through a restrictive filter. In the case of a fuel pump, the suction can cause the formation of bubbles in the fuel-- not good.

REgards, Neil  Tucson, AZ

[38flattie]

Neil,

That makes sense. I'll put it on the discharge side of the dry pump, between the pump and the resevoir.

Thanks!

[Milwaukee Midget]

I'm going to use a filter- just seems like a good idea, especially since I don't have an air filter!

No way of running any kind of an air filter? 

http://www.youtube.com/watch?v=F1BZg6aCGd8

Starts about 4:25 - The series is specific to the A-Block, but pertains to all engines. 

[38flattie]

Unfortunatly, I can't watch vidios on this company computer, and I'm at work another week

I'm running the bug catcher, and they have air filters available. I've never seen anyone run one, nor have I seen any flow data on them.

[Stan Back]

Buddy --

Where's the salt gonna kick up from to the top of the hood with your bulbous (I mean the car's) front fenders -- as long as you're going straight?

Stan

[38flattie]

 Stan, no fenders are required in comp coupe or altered.

Remember, it's not having a top that makes you go 'round, not absence of fenders!

[Rex Schimmer]

Buddy,
I'll give you my standard "rant" on filter location in a dry sump system. Almost everyone wants to put the filter on the outlet of the pressure section and it has been done for years but the best place for a filter is on the scavenger lines before the oil tank. Any engine parts or contamination that goes through the engine will go through the scavenger pumps and into the oil tank. Now gear pumps,which are the type of pumps that most dry sump systems use, are pretty dirt tolerate especially at low pressure, so if they ingest some smegma from the engine the scavenger pumps many have some scoring between the gears and the pump housings which will not adversely affect their function as they are low pressure but if this happens on the high pressure pump it will become less efficient and potentially have a more difficult time maintaining oil pressure. Putting the filter in the oil return lines to the tank will keep the tank clean and also prevent contamination from going to the high pressure pump. I think that most NASCAR set ups use both filters in the return lines and a smaller filter in the pressure line, but if you are going to only use one filter then put it in the return line to the tank.  Use a good filter, that is one that is rated at least 10 microns and make it big, this keeps the pressure drop down and also it will hold more contamination, although if you have any contamination this is probably a sign of engine problems.

Another note regarding filtration, you would be surprise on the amount of contamination in a quart of "new" oil, some place I have some microscope photos of the junk that came out of a "new" quart of Pennsoil, you would not want this stuff in your engine. Obviously the best thing you could do is to filter the oil as you put it into the tank, most of us don't have that option so the next best thing is to make sure you don't try to drain the very last drop of oil from each quart as the junk settles to the bottom of the bottle and is usually in that last few drops.

Rex

Rex

[SPARKY]

I put and inline screen filter on the return so that I can check for debris between runs.  I may consider puting my big on the return.