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Stroking a Dolmar 7900

drf256

Dr. Richard Cranium
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1mm of total travel isn’t enough to matter.
Some guys take much more out on certain saws on a standard build.
Remember, you now have a longer stroke. So the distance of a 100* exhaust roof is greater than that of the standard crank.

So, you’ll have more volume to compress into the same chamber size at the same timing numbers.

You may want to see what a stock Dolmar 7900 is for compression, what it’s comp is at ideal squish, and figure out your game plan from there.

If you want an amount removed from the crown, ship it down.
 

Fruecrue

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Remember, you now have a longer stroke. So the distance of a 100* exhaust roof is greater than that of the standard crank.

So, you’ll have more volume to compress into the same chamber size at the same timing numbers.

You may want to see what a stock Dolmar 7900 is for compression, what it’s comp is at ideal squish, and figure out your game plan from there.

If you want an amount removed from the crown, ship it down.
Thanks Al.
 
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