[Cloud9...68]

Installing a crank scraper has always been high on my list of things to do while I have my engine out and apart, but this plan has hit a snag. The one I ordered doesn't fit, and the ususal Porsche parts places don't have any in stock, or they just plain don't carry them. I like the idea of having a crank scraper, because it's a "free" way to slightly reduce the intertia on the engine's rotating parts, but the Texas summer heat is just around the corner, so I want to get the engine back in the car before it becomes too hot in my garage to do this task, for which I'm planning to borrow a neighbor for help.



So my question is, is it worth waiting for someone to get a scraper in (they seem to be back-ordered at multiple places, though I haven't turned over every rock yet), and risk delaying my project another five months (suicidal thoughts, enter stage right...), or should I bag the crank scraper idea? I don't see them discussed much, so it seems that the benefit they offer is pretty marginal. I REALLY don't want to put one in once the engine is back in the car. Thanks.

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[flash]

mixed bag of nuts. i've seen them for other cars and seen them work, and i've seen them actually have problems. never seen one for a 968, so i can't speak to the design and its anticipated results

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[Cloud9...68]

Yeah, I'm a little skeptical because Lindsey Racing, who has every imaginable lubrication enhancing product (including a full dry sump system) doesn't carry one.

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[rxter]

Get an air conditioner for your garage.

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[flash]

momma go dogface in banana patch?

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[Rap]

Gee Flash now you sound like Andy from across the pond. Who has been quite lately!

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[Cloud9...68]

[quote name='rxter' timestamp='1331673365' post='123256']

Get an air conditioner for your garage.

[/quote]

That would be such the bomb, and my wife actually bought me a portable AC unit for Fathers Day last year, but there's no place to vent the exhaust without cutting a hole in the side of the house (which is brick). I may yet do that, because it's pretty miserable to work in the garage in the summer. But it's not so much my comfort I'm worried about - I don't feel good about putting my neighbor through it for the engine re-install if I can possibly avoid it.

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[flash]

i was seriously considering that. but, i just installed new super insulated garage doors. the change is phenomenal. the garage faces west, so it take the afternoon heat. the driveway would get over 130 degrees. the doors were not much better. that translated to a lot of heat getting into the garage, and then convecting upward to the front bedrooms. nothing i did could keep up, including a brand new super efficient 5 ton ac system and 24" of attic insulation. i just may be ok now if i manage the time the door is open thereby letting the heat in.



whodathunkit?



back to crank scrapers. any chance of getting a pic of one for a 968?

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[Cloud9...68]

"back to crank scrapers. any chance of getting a pic of one for a 968? "



Sure; here's mine, in position, showing how far off its stud holes are:



   



It's made by Ishihara-Johnson, which I believe is the largest manufacturer of crank scrapers and windage trays, but both vendors I talked to about them said they are very difficult to deal with. They sure blew it on mine.

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[craigawoodman]

Still think an accusump is a better option. Just dont let the fittings fail and spray oil everywhere and have an engine fire - for every solution there is a problem.

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[flash]

not terribly impressed with it. crank scraping is not to be taken lightly. the tolerances have to be pretty tight. i'd be worried if they blew the bolt holes how much they blew it on the rest.

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[Eric_K]

You do know the scraper in your picture is upside down? It might line up better if it is set on there right.



The IJ scraper fit my 2.5 with no problems and only minor clearancing needed.

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[flash]

lol - i wondered about that, but assumed i was just nuts

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[Cloud9...68]

Hmmm... I thought I followed the instructions as to the orientation, and I didn't see that it could go any other way, but I'll definitely try it again when I get home.

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[Eric_K]

The orientation pictured is definitely wrong. The section that goes across the block should be at the front of the engine and you should be able to read IJ and 3.0 correctly when looking down on it. The angled cuts on the scraper should also be facing the crank, not facing up.

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[MB968]

[quote name='Eric_K' timestamp='1331764651' post='123299']

The orientation pictured is definitely wrong. . . . The angled cuts on the scraper should also be facing the crank, not facing up.

[/quote]



Eric's comments make sense to me. From a design standpoint, you'd want any toughdown to force the scraper away not further into the crank. A general rule of mechanical design is to avoid negative feedback, where external forces on a member tend to create even larger forces between the members, leading to an unstable "dig in" situation. So, never delt with "crank scrapers" but looks to act more like a squeege wiping oil off the counterweights than what the term scraper conotates.

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[Cloud9...68]

Sigh... I feel like the dumbest living being on the planet (and I'm including plant life in this population...). Yes, I had in in upside down, and when I flipped it over, it fit fine. I don't know how I managed to do this, as I thought I tried multiple orientations to try to get the studs to align with the holes, but obviously not. The fit overall was pretty good - only the clearance between the scraper and the #7 crank lobe (counting from the front) was a little tight, so I filed it down, and now its fine. I doubt this will make a noticeable difference in the performance of my engine, but I figure it probably can't hurt.

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[MB968]

Heah, don't feel bad. I'd have probably done it too. It's called a scraper, I'd also have thought it went on the way you tried. I think they should be called a crank wiper.

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