Piston domes

What shape piston dome, will produce the most power?

Chrysler always thought it was hemispherical..... and their 426 hemi punctuated that opinion.:laugh:

Thing was so fast they finally outlawed it in NASCAR.

bountyhunter wrote:

Chrysler always thought it was hemispherical..... and their 426 hemi punctuated that opinion.:laugh:

Thing was so fast they finally outlawed it in NASCAR.

It was a one of, type piston to fit the head. Damn good power! Ports big enough to sick your arm in.

Kzz1p, offer this, raised domes offer the easiest way to increase compression. (IE) without changing bore or stroke. Kevin Cammeron offers some insight in his "Sportbike Performance Handbook". an intresting read,and much better explained than I'm capable of G

As much compression as you can get with the flattest top piston

In 1979 Suzuki introduced a revolutionary combustion chamber design that featured a 4 valve cylinder with a narrow included valve angle and a flat top piston. They called it the TSCC (twin swirl combustion chamber) and first used it on an 1100cc engine. This engine set benchmarks for power and fuel efficiency (50mpg) while producing a broad torque curve with usable power from idle to redline. The engine ran cooler and was so efficient that, in the 80's, when the EPA started to tighten emmision standards Suzuki didn't need to install an exhust air valve because there was no unburned mixture in the exhaust. All this performance was accomplished with a total ignition lead of 32 degrees.

Today, all high performance motorcycle engines have a 4 valve narrow included angle head with flat top pistons.

APE Jay wrote:

As much compression as you can get with the flattest top piston

And Jay's our winner!
Generally speaking, flat top pistons will out perform a pop up, any day of the week.

APE Jay wrote:

As much compression as you can get with the flattest top piston

definately,much easier for a flame to cross a flat dessert than a big mountain! :laugh:

bountyhunter wrote:

Chrysler always thought it was hemispherical..... and their 426 hemi punctuated that opinion.:laugh:

Thing was so fast they finally outlawed it in NASCAR.

hemis work good with a blower on em,but when it comes to carbs its hard to beat a RAT !