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Registered User
Join Date: Sep 2015
Location: Costa Rica and Pennsylvania U.S.
Posts: 1,833
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technical quiz
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formerly dug@project914
Join Date: Dec 2001
Location: Mountain View, CA
Posts: 674
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Sweet stuff Fred! I'm building a motor around a similar setup now...
66mm 6-bolt S crank with rod journals turned down for Ti GT3 rods that will go in a 3.0 turbo case. How fast have you spun yours? cheers, dug
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1973 914-6 MetalCraft Racing C-Prod/TransAm/IMSA history |
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Registered User
Join Date: Sep 2015
Location: Costa Rica and Pennsylvania U.S.
Posts: 1,833
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spin it up
You will like that setup.Your Ti rod is 1mm longer at 130mm.I have one built on 76 turbo 3.0 case that spins to 9300 rpm.I like 132mm Ti rods that make the rod / stroke ratio 2 to 1.What heads are you using?Enjoy your build
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Registered User
Join Date: Dec 2014
Location: Syracuse,Ny
Posts: 2,267
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Sounds pricey, I'm getting ready to build a 3.0 any suggestions other than the usual stock crank, 964 cams et ?
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Registered User
Join Date: Jul 2005
Location: Atlanta
Posts: 1,049
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That sure is purdy.
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No physical quantity completely explains its own existence |
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Under the radar
Join Date: May 2007
Location: Sebastopol, the land of wine and redwoods in The Republic of California.
Posts: 5,965
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Interesting. Who made the non-counterweighted crank? Why no counterweights?
Seems that the extra 10 pounds could be subtracted from the flywheel with equal results?
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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what? me worry?
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 7,104
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The T crank will spin up faster..MOI is less without those pesky counterweights..
Good short stroke T cranks, that measure within spec and ring true, are desirable to certain small displacement class racers..
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Registered User
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Fred, who makes the crank on the left and what cam are you running with it?
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Under the radar
Join Date: May 2007
Location: Sebastopol, the land of wine and redwoods in The Republic of California.
Posts: 5,965
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Quote:
FWIW, I ran a SS2,5 based on a T motor for years. My new 3,0 L revs up just as fast.
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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Puny Bird
Join Date: Nov 2002
Location: Port Hope (near Toronto) On, Canada
Posts: 4,177
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The non counterweighted will spin up faster, but the counterweighted will beat it for longevity.
There's no such thing as a perfect engine, everything is a compromise.
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'74 Porsche 914, 3.0/6 '72 Porsche 914, 1.7, wife's summer DD '67 Bug, 2600cc T4,'67 Bus, 2.0 T1 Not putting miles on your car is like not having sex with your girlfriend, so she'll be more desirable to her next boyfriend. Last edited by Mark Henry; 06-08-2018 at 06:48 PM.. |
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Registered User
Join Date: Jun 2003
Location: Camarillo, Ca.
Posts: 2,320
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Factory 66mm 9 bolt on the right and modern equivalent on the left. I want as much counterweight as you can give me.
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Aaron. ![]() Burnham Performance 1071 Avenida Acaso suite D Camarillo, Ca.805-240-6931 https://www.instagram.com/burnhamperformance/ |
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Registered User
Join Date: Sep 2015
Location: Costa Rica and Pennsylvania U.S.
Posts: 1,833
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22.5 lb.crank
Crank was made in South America.I have a friend Peter Dawe who has used their 4.0L Crank for many years with no issue.I will choose cam after the heads are flowed with intake and exhaust pipe.I use early 3.6 head and narrow the stud spacing.The early heads that have not been machined fit right on the 95 or 98mm cylinder.I will post some more pics tomorrow.Ciao
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