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08-03-2013
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#1 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,188
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Flat Plane Crank
Anyone see that Ford is putting a flat plane crank in the DOHC Coyote motor; is supposed to crank out close to 600hp with no power adders....NA.
Would be an awesome seting for an LT-5
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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08-03-2013
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#2 | |
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Join Date: Aug 2005
Location: Fishers, IN
Posts: 813
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Re: Flat Plane Crank
Quote:
92.4mm stroke and that is as big as you could go due to vibration. That's like 389 cu in with a 4.125 bore. Would have to turn it to around 8200 to equal what a maxed out 427 does with conventional crank. Yes, I've thought about this .... |
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08-03-2013
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#3 |
 Join Date: May 2005
Location: Nichols, FL
Posts: 615
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Re: Flat Plane Crank
I think I know where one is for the LT-5 if you are interested.
Tyler
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55 Polo White (Project) 61 Jewel Blue (Sold to buy above) 66 Nassau Blue 68 Torch Red 88 ZR1 Blue 90 ZR1 White |
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08-03-2013
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#4 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,188
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Re: Flat Plane Crank
the guy in Phoenix?
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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08-04-2013
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#5 | |
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Join Date: May 2005
Location: Nichols, FL
Posts: 615
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Re: Flat Plane Crank
Quote:
No. Geoff is on vacation at the moment. He tried it and was not too happy with it but I will ask next week what his experience was and did he want to sell it. Tyler
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55 Polo White (Project) 61 Jewel Blue (Sold to buy above) 66 Nassau Blue 68 Torch Red 88 ZR1 Blue 90 ZR1 White |
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08-05-2013
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#6 | |
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Join Date: May 2005
Location: Nichols, FL
Posts: 615
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Re: Flat Plane Crank
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@@@@@@@@@@@@@@@@@@@@@ Hi Tyler, sold the crank, rods, pistons and cams about two years ago. Flat plane is ok for power but runs out of balance as two four cylinder engines so vibration is huge. I wouldn't advise using for road applications. @@@@@@@@@@@@@@@@@@@@@ Ford may have solved the balance problems but I would be interested in just how they did it. Tyler
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55 Polo White (Project) 61 Jewel Blue (Sold to buy above) 66 Nassau Blue 68 Torch Red 88 ZR1 Blue 90 ZR1 White |
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08-04-2013
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#7 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,706
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Re: Flat Plane Crank
Quote:
Is that for stock Coyotes? Didn't someone have a vid of a flat plane crank LT-5 at one time? Wonder if Graham has any comment?
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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08-04-2013
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#8 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,188
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Re: Flat Plane Crank
Lotus GT-1 ran a flat plane LT-5, the Coyote version will be the next GT350
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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08-04-2013
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#9 |
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Join Date: May 2007
Location: Addison IL
Posts: 250
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Re: Flat Plane Crank
About two years ago Doug Rippie told me that he had just completed a LT5 engine with a flat plane crankshaft. His customer was in FL.
I would expect that a flat plane crank would be worth 15 hp in a 600 hp LT5. All due to better exhaust scavenging. |
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08-04-2013
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#10 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,706
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Re: Flat Plane Crank
Marc,
That's interesting because it aligns w the results of using a higher duration/higher lift exhaust cam. Was the motor stock otherwise?
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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