[wolf]

Originally Posted by Tom Vaught

You said 10.5 and Jack said 14 so the difference is 3.5 points of compression.

It is a known fact that every point of compression will get you 3% more power.
("HO Racing rule" but verified by me at work as a valid "back of envelope" number.)

So Jack's engine would make 17.5 more HP assuming a 500 HP engine) vs your 10.5 compression ratio engine.

My math says 52.5 HP more...?

[MCronkGTO]

FYI here in Central Florida I have several Sunoco stations that sell 100 octane gas. It is not cheap $8.99 a gallon but you could mix it with 93 octane they sell.

I run it straight in my 2 stroke KTM dirt bike that has had some head work. Smells great and definitely helped. Our races are a mix between 2 hour hare scrambles and some MX races. Conditions can range from 90+ degrees with over 70% humidity to 30 degrees with less than 50% humidity!

MarkC

[Stan Weiss]

Originally Posted by wolf

My math says 52.5 HP more...?

500 HP going from 10.5:1 to 14:1 CR.

Can you please explain your math?

Stan