SamIyam
09-12-2004, 01:50 AM
Two hunert and eighty three cubes... eight squirrels... yep, we're downsizing.
The motor is a vintage 283, bored .060, and was assembled thirty years ago... it had served duty in my buddy Tim's '62 Chevy II... ran in the low 13's back then... and got pulled and replaced with a stroked 327 (350) about 8 years ago.
Since '96... the motor has sat idle on the side of his house... we would like to run the Enderle injection set up on alcohol... and that requires a little more... ok, quite a bit more compression than the 9.5:1 350 that's in there now has to offer. (until we go through it and put the 13.5:1 pistons and new rods/crank and cam in it). The 283 happens to have 11.5 (nominal) slugs in it now... and with a thinner head gasket the thing should be up to the task of handling twice the amount of fuel that the alcohol injection will feed it.
Tim originally pulled the motor in favor of the stroked 327 because after a missed shift at Fremont the little motor was closing the gap on #1 cylinder... we'll have to check clearences, but Tim may have put a fresh set of hotter plugs in the motor prior to that race and that is hopefully the reason for the problem. Four of the pistons have little nicks in them where you could see where the electrodes were nicking them. That day at the races, he had put some washers under the spark plugs and it solved the "closing the gap" problem. In fact, he made several 6500 rpm shifts after fixing the problem.
This brings me to a question for the metalurgists and engine builders... Can you streatch a stock rod by zinging the motor to god knows how many rpm's?? I don't think it's likely, but stranger things have happened.
So the particulars on this motor are 11.5:1 Forged TRW pistons, cast crank (turns out they really did make 283 cast cranks), Duntov 30/30 solid lifter cam (hell on duration wimpy on valve lift), aftermarket rod bolts. 1.94 stainless valves, screw in studs... all in a nice pair of 462 heads that Tim's bro bought at the Chevy delership to throw on this gem back in the late 60's/early 70's.
Today we tore the thing all apart and Tim cleaned the block. I pulled one of the heads apart and cleaned up the valves and checked the guides out. I also measured intsalled hights of the springs and will get a spring tester and check the springs out tomorrow. Tim and I inspected all the bearings and all looked good. There is a nick on one of the crank journals that needs to be tended to as it put a little groove in one of the bearigs... Tim ran a tap down all the holes and cleaned gasket surfaces and I honed the cylinders to give them a little cross hatching...
We'll clean it all up, assemble it back together with a modern solid lifter cam instead of the Duntov and put a set of roller rockers on it and run it...
Should be cool to see how this wee-motor runs compared to the 350... and the injection should have a little bit of a learning curve to it, but we were smart enough to send it off and have it flowed... put a new pump in it and I'll set the barrel valve with a leak down tester as well as set the butterfly's before fireup...
Sam.
The motor is a vintage 283, bored .060, and was assembled thirty years ago... it had served duty in my buddy Tim's '62 Chevy II... ran in the low 13's back then... and got pulled and replaced with a stroked 327 (350) about 8 years ago.
Since '96... the motor has sat idle on the side of his house... we would like to run the Enderle injection set up on alcohol... and that requires a little more... ok, quite a bit more compression than the 9.5:1 350 that's in there now has to offer. (until we go through it and put the 13.5:1 pistons and new rods/crank and cam in it). The 283 happens to have 11.5 (nominal) slugs in it now... and with a thinner head gasket the thing should be up to the task of handling twice the amount of fuel that the alcohol injection will feed it.
Tim originally pulled the motor in favor of the stroked 327 because after a missed shift at Fremont the little motor was closing the gap on #1 cylinder... we'll have to check clearences, but Tim may have put a fresh set of hotter plugs in the motor prior to that race and that is hopefully the reason for the problem. Four of the pistons have little nicks in them where you could see where the electrodes were nicking them. That day at the races, he had put some washers under the spark plugs and it solved the "closing the gap" problem. In fact, he made several 6500 rpm shifts after fixing the problem.
This brings me to a question for the metalurgists and engine builders... Can you streatch a stock rod by zinging the motor to god knows how many rpm's?? I don't think it's likely, but stranger things have happened.
So the particulars on this motor are 11.5:1 Forged TRW pistons, cast crank (turns out they really did make 283 cast cranks), Duntov 30/30 solid lifter cam (hell on duration wimpy on valve lift), aftermarket rod bolts. 1.94 stainless valves, screw in studs... all in a nice pair of 462 heads that Tim's bro bought at the Chevy delership to throw on this gem back in the late 60's/early 70's.
Today we tore the thing all apart and Tim cleaned the block. I pulled one of the heads apart and cleaned up the valves and checked the guides out. I also measured intsalled hights of the springs and will get a spring tester and check the springs out tomorrow. Tim and I inspected all the bearings and all looked good. There is a nick on one of the crank journals that needs to be tended to as it put a little groove in one of the bearigs... Tim ran a tap down all the holes and cleaned gasket surfaces and I honed the cylinders to give them a little cross hatching...
We'll clean it all up, assemble it back together with a modern solid lifter cam instead of the Duntov and put a set of roller rockers on it and run it...
Should be cool to see how this wee-motor runs compared to the 350... and the injection should have a little bit of a learning curve to it, but we were smart enough to send it off and have it flowed... put a new pump in it and I'll set the barrel valve with a leak down tester as well as set the butterfly's before fireup...
Sam.