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Jul 21st, 2025 | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | From a 270 GMC? My recent number crunching and experimenting with Nissan Diesel pistons and sleeves in a 261 Chevy sent me down another rabbit hole. It seems that the Nissan Diesel engine has an almost identical bore size as a standard bore GMC 270, and the piston crown is thick enough to stand some energetic whittling to compensate for a stroker crankshaft. By using a smaller connecting rod bearing and doing some modifying to the GMC connecting rod, it would be possible to increase the stroke of the 270 to 4 3/8 inches, and use the Diesel pistons and sleeves, to get a total displacement of 290 cubic inches. That stroke would also be longer than the 302 GMC, for increased torque. 270s are a lot more plentiful than 302s- - - - - -and I just happen to have a couple of them to tinker with- - - - -HMMMMMMM!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Feb 2023 Posts: 190 'Bolter | | 'Bolter Joined: Feb 2023 Posts: 190 | That sounds like quite a project 👠Looking forward to how this goes !
Last edited by Peggy M; 02/04/2024 6:30 PM.
| | | | | Joined: Feb 2016 Posts: 1,841 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,841 | Shoot Jerry! don't stop with that puny 4-3/8 stroke, as long as your using diesel parts take it to the Caterpillar D9 specs 6.25" bore and 8.00" stroke=1472 cu.in. 6 cylinder. I had the pleasure of working with a drainage contractor in the mid seventies, that crawler made the earth tremble.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
| | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | There's the remains of a stationary engine that used to run a cotton gin down at the Alabama state line near me. Single cylinder Diesel, with a 24" bore and approximately a 4 foot stroke. The flywheels (two of them) are cast in several pie wedge shapes and bolted together. They're close to 8 feet in diameter. I believe top speed on that one was around 60 RPM, but the torque was incredible. It was started by locking the flywheel, filling the combustion chamber with compressed air, and release the flywheel brake. Once the engine was spinning with the compression relieved, then the compression release was closed off. It shook the ground, too! Sort of like this one- - - - -only bigger! Go to about the 3 minute part of the video: www.youtube.com/watch?v=MiMPTCVz4mQJerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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