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: 2,422 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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yeahmag |
Jun 23 2023, 01:08 PM
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#2
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Advanced Member Group: Members Posts: 2,422 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California |
I run the full AA piston and cylinder kit now on my 2056cc that regularly sees 7500RPM for short bursts. No problem here either. I already have the JE's that I got in a parts deal and they are set up for a stroker, so no extra costs here...
WRT to rods, I'm looking at both brand and length. I need to do some calculations, but I'd like to run as long a rod as I can without a ridiculous shim under the barrel. I'm trying to stay above 1.70 rod ratio. 5.1” Rods (stock 2L) = 129.54mm * 71mm stroke = 1.82 rod ratio 5.325” Rods = 135.255mm * 71mm stroke = 1.90 rod ratio * 78mm stroke = 1.73 rod ratio * 78.4mm stroke = 1.72 rod ratio * 80mm stroke = 1.69 rod ratio 5.40” rods = 137.16mm * 71mm stroke = 1.93 rod ratio * 78mm stroke = 1.75 rod ratio * 78.4mm stroke = 1.749 rod ratio * 80mm stroke = 1.71 rod ratio 5.50” rodes = 139.7mm * 71mm stroke = 1.97 rod ratio * 78mm stroke = 1.79 rod ratio * 78.4mm stroke = 1.78 rod ratio * 80mm stroke = 1.74 rod ratio |
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