2270 Engine Questions, Crank and Rods |
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2270 Engine Questions, Crank and Rods |
yeahmag |
Jun 23 2023, 12:34 PM
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#1
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Advanced Member Group: Members Posts: 2,423 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California |
I'm getting close to having all the parts for the 2270 build, but have a few questions:
This will be primarily an autocross engine with some weekend drives. I also drive to events. The engine needs to be able to spin to at least 7500RPM even if it's not making power up there. Here's the rest of the config (all of these parts are in hand):
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cgnj |
Jun 25 2023, 07:56 AM
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#2
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Senior Member Group: Members Posts: 627 Joined: 6-March 03 From: Medford, NJ Member No.: 403 Region Association: None |
Just had a conversation last Friday with Jorge @EMS regarding a long stroke long rodded motor. My concerns were engine width and cam clearance. I built a 2270 in the stone age and went thru the knothole to get it right. I just sourced a W code case and wanted to build the biggest motor I could and still do a valve adjustment without dropping the motor.
My take away is over 82mm stroke=Chinese crank. No thank You. No case clearing required with 2.0 journals. No rod cap clearing for cam. (I find this hard to believe but I'm going to go with it). You have your heads and cam in hand. Confirm the chamber volumes first. This was the biggest problem with my build. They went to Headflow Masters with 60 cc volumes and came back with 54 cc volumes. They work fine it just made the process take much longer. Is the cam on a reduced base circle? I used a 163/86b on reduced base circle. With VW journals I had to clear the endcaps. I switched to the newer German swivel foot adjusters. Much easier to check the valve lash. I think you're good @ 80mm with 5.5 rods. I think end cap to cam will be your biggest obstacle. |
Jack Standz |
Jun 25 2023, 01:05 PM
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#3
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Member Group: Members Posts: 285 Joined: 15-November 19 From: Happy Place (& surrounding area) Member No.: 23,644 Region Association: None |
Is the cam on a reduced base circle? I used a 163/86b on reduced base circle. With VW journals I had to clear the endcaps. I switched to the newer German swivel foot adjusters. Much easier to check the valve lash. I think you're good @ 80mm with 5.5 rods. I think end cap to cam will be your biggest obstacle. Not sure if this was directed at me, but I can concur with your ideas and stay within the subject matter of this thread. We have three 1.7 liter cases (two are "W" cases) torn down and will pick the best of the lot for the project build. Like your build, the cam on-hand is Webcam's 163/86b reduced base circle camshaft, unless we change the plan. Crank is 80mm stroke with type 1 Journals. Rods are Empi I-Beam 5.5" length. Aftermarket tool steel swivel foot adjusters (German). Would have preferred a 78mm stroke crankshaft, but could not find one. Will clearance if/as needed. |
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