Bore & Stroke discusion Options

[KenH]

Assuming all the "other" parameters will be optimized for the B & S.

What are the Pros & Cons between 103mm x 71mm and
96mm x 78mm. Cost factors, reliability, ease of doing, etc.

Any comments on any other combinations??

Ken

[Jake Raby]

78X96 is BY FAR the best combination, if you use the right combination of compatible components to comprise the engine. If you want to make this job so simple that a 15 year old can do it successfully, grab one of my engine kits! The second best solution is grabbing the parts from me individually as this guarantees that all the parts will be compatible and will only effect ease of assembly a tad bit since you won't get the "Support" that we give to full kit customers.

The 2270 (78.4X96) combo is the best for many reasons but primarily for the cost Vs. HP and the fact that this combo has been my most researched and has the highest build concentration here, because its just so damn perfect!

The 103mm bore size, IMHO requires Nikies cylinders to remain free of head leaks and associated problems with the HUGE bore size. These issues are not present with the smaller bores up to 96mm and only become apparent after reaching the 100mm threshold. (do searches for more info)

Also the 103mm bore size requires serious and expensive cylinder head modifications to sustain the huge bore size without sacrificing RPM range or power output. If you don't have 2K+ for a set of cylinder heads the 103mm bore will more than likely COST YOU USABLE POWER!

I do not have much time at all to go over this right now, as this week I'm building a 2270 engine while a writer from Hot VWs does a comprehensive story on the build up...