2270(or so) Build Options

[yeahmag]

I'm starting to get the case(s) machined and inspected and parts ordered for my next generation engine. The car is mostly used for autocross.

78x96
96mm piston with 22mm wrist pin (stroker)
5.4" Type 1 Rod, 22mm wrist pin
WebCam 86b/86c
David Finch heads (from Len Hoffman many moons ago)
9.5:1 CR running on 91 octane pump gas
CB Dry Sump (heavily modified) or Thorsten Piper dry sump pump
Front mounted oil cooler

There are a few crank options out there now:

* DPR offset grind Type 1 journal
* AA Performance Forged Type 1 journal
* FAT Performance Forged Chevy journal

I've read about a few 80mm DPR cranks breaking, so I was planning on staying under 80mm as I like the car to be able to rev. I was considering Chevy journals for ease of assembly, but the two cranks I've read about breaking were 80mm/Chevy journals. Is there any new information on cranks out there? Any input on the config?

[groot]

Hmmmm... I didn't have much clearancing required for the Chevy rods and 80mm crank, but it's the only stroker I've built. I took my time and checked it a lot. Time will tell if I did an adequate job ;-)

Chevy/Buick journals are smaller than type 1, so should require less clearance work?... maybe you're comparing the clearancing required for type1 rod with 78mm versus Chevy rod and 80mm crank?

[Mark Henry]

Hmmmm... I didn't have much clearancing required for the Chevy rods and 80mm crank, but it's the only stroker I've built. I took my time and checked it a lot. Time will tell if I did an adequate job ;-)

Chevy/Buick journals are smaller than type 1, so should require less clearance work?... maybe you're comparing the clearancing required for type1 rod with 78mm versus Chevy rod and 80mm crank?

It's the rods with that T4 combo and a big lift cam, say the web 163/86b. One cam lobe comes close to a rod and you have to clearance the rod big end, so you have to match both sides and then all the rods must match.

Also I was confusing the Type one 2007cc, 78 X 90.5mm build I'm doing right now, lots of case clearing...dry fit over and over again.... (IMG:style_emoticons/default/wacko.gif)

[groot]

It's the rods with that T4 combo and a big lift cam, say the web 163/86b. One cam lobe comes close to a rod and you have to clearance the rod big end, so you have to match both sides and then all the rods must match.

Also I was confusing the Type one 2007cc, 78 X 90.5mm build I'm doing right now, lots of case clearing...dry fit over and over again.... (IMG:style_emoticons/default/wacko.gif)

Yeah, Mark, that's the combo I went with: 163/86b, reduced base circle, 80mm with Chevy journals, 5/16 rod bolts. I did have big end clearancing to do, not too much... very little on the case.... could have been lucky, though.