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Crankscraper
Posted: Tue Oct 23, 07 8:50 am
by AllKiller
Why can you buy crankscrapers for C***ys off the shelf but you have to make em for Mopars ???
or does anyone know of someone for stroker cranks

Posted: Tue Oct 23, 07 9:43 am
by Blue
Have you had a look at crankscrapers.com? Some Mopar listed there...
Perhaps Cometic could make a combined scraper and gasket, has to be a market for it.
Posted: Tue Oct 23, 07 10:06 am
by AllKiller
Perfect Blue thanks, just the job

nifty little rear windage/ scraper for the B/B too
Posted: Tue Oct 23, 07 11:17 am
by Anonymous
Whats one of them then?
Posted: Tue Oct 23, 07 11:31 am
by AllKiller
Free horsepower to you son and oil control

Clivey
Check it here as pointed to me by Blue
http://www.crank-scrapers.com/Chrysler.html
Posted: Tue Oct 23, 07 11:48 am
by Dave-R
Blue wrote:
Perhaps Cometic could make a combined scraper and gasket, has to be a market for it.
Good idea.

Posted: Tue Oct 23, 07 11:58 am
by Anonymous
Interesting
Posted: Tue Oct 23, 07 12:48 pm
by AllKiller
Clive quite cheap and worth every penny if chasing every pony

Posted: Tue Oct 23, 07 12:52 pm
by Blue
Thinking of using a crank scraper with a full length dragster pan on the next engine. Considering not using a windage tray but a mesh screen in the pan to stop splashback. I'm not convinced that windage trays are that effective.
Posted: Tue Oct 23, 07 12:55 pm
by Ivor
I've got a mesh screen in my Austin Seven...

Posted: Tue Oct 23, 07 1:02 pm
by AllKiller
Blue apparently i read from milodon that mesh is worth 20-22HP where as a windage tray from them is worth 12-14 HP....so both work but the mess as you say is better
The bigger slots in the Milodon windage are more effective though over others
Why dont they make a Diamond stripper for Mopar ??
Posted: Tue Oct 23, 07 1:15 pm
by Ivor
Just thinking out loud for a sec, if you go for the Milodon deep sump, which should keep most of the oil clear of the crank, does that mean you don't need a windage tray or a scraper?

Posted: Tue Oct 23, 07 1:39 pm
by Blue
You need something to stop the oil splashing back up out of the pan, that's one of the windage trays jobs. One of the arguments against fitting a tray close to the crank as we normally do, is oil coming off the crank hits the tray and splashes straight back onto the crank. That's why I thought a scraper would be better to "peel" the oil off the crank and drop it against mesh which should stop the splash back. One question I do have about that theory is, would that "peeling" action of the scraper introduce as much drag as it's supposed to prevent by getting the oil off the crank?
Posted: Tue Oct 23, 07 1:59 pm
by Dave999
I think its still worth a scraper
the oil clings to the crank adding to its mass and in times of surge adding to its mass unevenly (one end or tother) which has a small but adverse affect on the crank i.e can add to harmonic vibration i.e minute harmonic twists along its length
anything that takes off the big gloops reduces both oil mass on the crank and aerodynamic drag. pointless having a nice smooth crank with knife edges if its coverd in treacle
any big gloopy area spins the oil into a cloud which travels onto all surafces of the crank along its length adding again mass to the rotating assembly. stop big wet areas = stop adding to the cloud of oil in the sump means crank turns more freely through cleaner air
they also help control oil movement caused by the considerable amount of air shifted round by the crank as it spins. i.e cut down on the hurricane affect i.e do the same thing as a windage tray to some extent but by different means
these are supposed to work wonders on a hemi 6 with its long bendy harmonic afflicted crank.
This comes from the same school of thinking as having the inside of your engine/sump painted with special heat resistant but very smooth almost teflon pan like non-stick paint (no not the bores or bearing saddles .....

)
caveat
all of that stuff above comes not from experience but from having read some stuff so it may be Bananarama!
Dave
Posted: Tue Oct 23, 07 2:09 pm
by Ivor
Sounds pretty good to me Dave, even if you do think you could be talking cobblers.
Also, if you have a scraper, I would imagine that would control a lot of the oil splash as it would be "peeling" the oil off the crank as Blue says rather than throwing it off by centrifugal force.
At this rate it won't be long before we all convince ourselves to go dry sump!