Author Topic: Dolmar 7900 Porting Info  (Read 8594 times)

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Offline srcarr52

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Re: Dolmar 7900 Porting Info
« Reply #170 on: September 23, 2014, 07:03:57 pm »
I just measured up a stock 7900 and I got these numbers.

Squish 0.025"
Ex Dur 148
Tr Dur  96
In Dur  151
Blowdown 26

I'm thinking

-0.040" on squish
Squish 0.020"
Ex Dur 159
Tr Dur  104
In Dur  159
Blowdown 27.5

I know people have mentioned that they like lots of blowdown, probably because of the small crankcase volume, but what is a lot?  To me... stock is a lot.

 

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