Crank Scraper Install

javsst

Just received the crank scrapers from Bull Tear today for the 360. For those that may have installed them, what are the procedures? I know you need to get them close to the journals without touching, but is there a measurement that should be followed? Also, I take it silicone above and below to seal it to the block and pan, however what about in the pan seal area? Anything I should know about there? Thanks for any input on this! Steve

jeepsr4ever

We really need digitized instructions for these. Let me see what I can do here.

jeepsr4ever

Here you go :wink:

javsst

Now that's what I call service! :t:

hugh

Pardon the question, but what is the benefit of adding the scraper to the engine? Does it free it some HP? I just put a 304 in my CJ so some upgrades are in order over the next few months.

javsst

The main benefit of the scraper is to cut down on oil "windage" in the crankcase at higher rpms. There's potential for up to 10hp there. This engine build is going into a 69 AMX that'll see occasional passes down the 1/4 mile and I expect rpms to be in the 6000 to 6500 rpm range. For engines that won't see higher than normal rpms, it's my understanding it really won't help much, if at all. Steve

Kevin Johnson

javsst wrote
The main benefit of the scraper is to cut down on oil "windage" in the crankcase at higher rpms. There's potential for up to 10hp
there.

This engine build is going into a 69 AMX that'll see occasional
passes down the 1/4 mile and I expect rpms to be in the 6000
to 6500 rpm range.

For engines that won't see higher than normal rpms, it's my
understanding it really won't help much, if at all.

Steve

The potential return is typically about 3% of the engine's output. Scrapers can reduce the ET of a big block Mopar by about .10 sec. In a 9.6s late 60s Charger that works out to about 30 hp.

Scrapers are included in many stock engines and have been for about 50 years -- they do help at lower rpms. Many people have difficulty believing they also can help diesel engines.

Here is a picture of a full blown scraper setup in a Mercedes diesel (603). This engine is from twenty years ago so this is not some mysterious new information. The scrapers impart a vector towards the sump well.

The scraper design seen here is also used by Porsche and both Porsche and Mercedes were preceded in its use by -- surprise -- Ford. The FE engine has been around now for about 50 years.

Goose

:? Dude Thats an outstanding set of instructions.. particularly the LARGE RED LETTERS RE-Install the oil pickup tube..!! I laughed at that, until I realized that out there somewhere there is someone who will forget. (Most of us are easily capable of forgetting ) but who will then trash the motor and sue you..! (Most of us are not capable of that! thank God.) Good Instructions!

Kevin Johnson

Goose wrote
:? Dude Thats an outstanding set of instructions.. particularly the LARGE RED LETTERS RE-Install the oil pickup tube..!! I laughed at that, until I realized that out there somewhere there is someone who will forget. (Most of us are easily capable of forgetting ) but who will then trash the motor and sue you..! (Most of us are not capable of that! thank God.)

Good Instructions!

It happens fairly often, I think. You get distracted, etc. Just had a link to my site from a Honda board where a guy rebuilt his F22 and discovered his pickup was left out.

More insidious are cracked pickup tubes -- Porsche 944 and 968 engines are known for it.