EMC 289
Posted: Wed Oct 09, 2019 3:32 am
Been home for a few days and finally starting to get back to normal. I've had a few people asking about some details about the engine and wanted to say thank you to some people that helped out with the engine.
The rules were pretty tight this year, so to say that there were tons of fancy parts would be a stretch. The bore was 4.041 filled by off the shelf JE SRP Pro flat top pistons. We played some games to get the ring tension down. Compression 10.47:1
The stroke was 2.88" a stock C3AE 260 crankshaft with a fair bit of shaping sanding and shot peening, ground 30/40.
The block was a 68' bored and honed with torque plates, a main girdle, align hone mains and decked .009".
Camshaft was an Isky hydraulic roller cam that we used Crower solid roller lifters on. 242* .595 / 242* .540 106* (I would make a few minor changes to it if I had to do it again) it was the only cam we ran and did work good.
The heads is where we spent a lot of time, Bill-C from Carlquist racing engines did his CNC porting and then we spent time playing with them from there. Its a great foundation for this engine, if your looking at working with OEM heads you should hit him up. We converted them to 8mm stems and modified Ls valves 1.91/1.53. Ferrea had the only 15 degree exhausts I could find. Everthing else was 25 degree and didn't seem like a good fit for the old shallow bowl exh port, not mention getting compression was already tough.
We battled a strange issue at the Competition with what appears to be an ignition issue (Jon Kaases advice) so we'll be testing the engine again in the upcoming weeks to see if we can replicate and solve it.
It was a nice week hanging out and meeting new people and talking with other engine builders. Thanks to JE Amsoil SAM Lonnie, Adger, RJ and everyone else that went in to putting on the show.
Gotta give to Blair Patrick, no one saw the old 390 coming.
To Carlquist racing engines, Dave Bloom,Jon Cloud, Todd Ferguson, John Hildebrand, Gary Camp (GRC) Steve Brule and my DAD THANK you,, these guys were a huge help making it happen.
The rules were pretty tight this year, so to say that there were tons of fancy parts would be a stretch. The bore was 4.041 filled by off the shelf JE SRP Pro flat top pistons. We played some games to get the ring tension down. Compression 10.47:1
The stroke was 2.88" a stock C3AE 260 crankshaft with a fair bit of shaping sanding and shot peening, ground 30/40.
The block was a 68' bored and honed with torque plates, a main girdle, align hone mains and decked .009".
Camshaft was an Isky hydraulic roller cam that we used Crower solid roller lifters on. 242* .595 / 242* .540 106* (I would make a few minor changes to it if I had to do it again) it was the only cam we ran and did work good.
The heads is where we spent a lot of time, Bill-C from Carlquist racing engines did his CNC porting and then we spent time playing with them from there. Its a great foundation for this engine, if your looking at working with OEM heads you should hit him up. We converted them to 8mm stems and modified Ls valves 1.91/1.53. Ferrea had the only 15 degree exhausts I could find. Everthing else was 25 degree and didn't seem like a good fit for the old shallow bowl exh port, not mention getting compression was already tough.
We battled a strange issue at the Competition with what appears to be an ignition issue (Jon Kaases advice) so we'll be testing the engine again in the upcoming weeks to see if we can replicate and solve it.
It was a nice week hanging out and meeting new people and talking with other engine builders. Thanks to JE Amsoil SAM Lonnie, Adger, RJ and everyone else that went in to putting on the show.
Gotta give to Blair Patrick, no one saw the old 390 coming.
To Carlquist racing engines, Dave Bloom,Jon Cloud, Todd Ferguson, John Hildebrand, Gary Camp (GRC) Steve Brule and my DAD THANK you,, these guys were a huge help making it happen.