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Times aren't looking so good so I am in need of building a motor sooner rather than later. My question is which would you rather have in your motor? I am building this car as a spirited street car with some road racing I hope. Thanks
wow I went throught this a while ago. From what I gathered a crank scraper keeps the oil off the roating assembley and keeps the oil in the pan and a girdle is for bottom in stregth under high rpm's. I ended up buying a kiggly girdle /ubbthreads/images/graemlins/grin.gif
the stock pan is fine with the kiggly girdle, though IIRC the ARP mains may cause a bit of denting to be necessary.
I'm not sure of it doing the same action as a scraper, but then again I don't think those are necessary in the first place. I do however thing it's preposterous to spend all the money to build a motor with nice rods & pistons and not spend the extra money to have it assembled with a girdle on it.
Well, unless you want the mains to walk around and to snap crankshafts. /ubbthreads/images/graemlins/dunno.gif
You may also need an aftermarket pan. I have heard some pans don't fit over a girdle.
You have the reversed. After market pans will not fit. They do not clear the girdle. You can get them to fit but you have to grind and the reweld. The factory pan fits just fine. You just have to put two small dents in the pan to clearance the arp main studs after you have threaded them out so you have 15mm of thread showing after the main caps and girdle are inplace.
Because, like getting your block torque plate bored, the block alters slighty when the head/girdle is bolted to it. And in order to get the best benefit of a girdle, this alteration needs to be accounted for.
The whole purpose of the girdle is to provide extra strength when seeing very high rpms (ie, 9k+). Most street cars will not need a girdle since 90% of your time will be under 4k rpm.
A crank scraper, in order to be of any use, need to literally hug the crank, within less than a 1/4 inch. And it's purpose is to prevent the crank from carrying oil during its spin. This will free up a decent amount of hp due to less drag and will keep the oil in the pan where it needs to be. However, the benefits of a scraper are again, best seen at very high rpms. A windage tray works according to the same theory, but takes a different approach.
AThe way I'd categorize it is that a girdle is for strength, a scraper is for endurance and lubrication (and maybe some fuel economy). Ideally, you'd want both.
More practically, unless you're running a lot of power or a stroker, the scraper will probably do you more good for a street car. The girdle also blocks off a decent amount of area, but it doesn't sit that close to the crank, so it won't really perform like a well designed scraper.
So, 2.0L, Scraper unless you're going overboard. 2.3/2.4L Stroker, Girdle.